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CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

CORROSION INHIBITOR, WELL, PIPELINE, AND METHOD FOR CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

The present invention has been developed in light of the above circumstances, and has an object of providing a corrosion inhibitor that can satisfactorily prevent corrosion of the inner surfaces of the oil extraction tubing in production wells and the transport piping in pipelines, as well as providing a well, a pipeline, and a method for forming an anticorrosion film that uses the corrosion inhibitor. How are corrosion inhibitors pumped into a well?How are corrosion inhibitors pumped into a well?Corrosion inhibitors can be pumped directly to the bottom of the oil or gas well via a macaroni or kill string where well completions allow. If a bottom-hole injection valve is fitted, then a solution of corrosion inhibitor is placed in the annulus and a make-up inhibitor solution added with a suitable pump.Corrosion Inhibitor - an overview ScienceDirect Topics How are corrosion mitigation methods used in oil and gas wells?How are corrosion mitigation methods used in oil and gas wells?Some of the most widely used and effective corrosion mitigation methods used in oil and gas wells and pipelines are discussed below. These are chemicals that are applied to the surface of the metal to suppress the reactions that cause corrosion. Inhibitors work in several ways, including:Pitting Corrosion in Oil and Gas Wells and Pipelines

Which is the best treatment for corrosion control?Which is the best treatment for corrosion control?If a bottom-hole injection valve is fitted, then a solution of corrosion inhibitor is placed in the annulus and a make-up inhibitor solution added with a suitable pump. Continuous treatment through an injection line is the preferred method of treatment to give reliable corrosion control. Typical applications are:Corrosion Inhibitor - an overview ScienceDirect Topics(PDF) CORROSION AND ITS PROTECTION A Review paper

Corrosion is caused by steel over time restoring to its natural state of iron steel. Several protection methods against Corrosion have been developed including cathodic protection and using inhibitors and coating. Hot wax dip method and sealing service with poly sulfide are two popular protection methods of corrosion.(PDF) Corrosion Inhibitor and Oxygen Scavenger for use as CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Corrosion Inhibitor and Oxygen Scavenger for use as MEG Additives in the Inhibition of Wet Gas Pipelines. Offshore Technology Conference-Asia, 2014. Rolf Gubner. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 35 Full PDFs related to this paper.

Application of corrosion inhibitors for steels in acidic CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

Sep 01, 2014Corrosion inhibitors for hydrochloric acid solutions. As mentioned above, among acid solutions, HCl (at 528% ) is the most widely used for the acidizing procedure and that is why the main focus is on this acid (see below and Table 2). However, not all CIs tested in HCl solutions (given below) have already been used for oilfield applications, but the emphasis herein is on summarizing what kind Author Tomoe YasuyoshiPublish Year 2019CORROSION INHIBITOR, WELL, PIPELINE, AND METHOD FOR CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Complete Patent Searching Database and Patent Data Analytics Services.CORROSION INHIBITION OF WET GAS PIPELINESwere measured using LPR (linear polarization resistance) technique as well as weight loss method. Following each test, the specimens were removed, dried, and immersed in an inhibited acid for 5 minutes. The inhibited acid was a 2:2:1 mixture of acid:water:commercial corrosion inhibitor. The

CORROSION INHIBITOR - Oilflux

Corrosion is an ever present issue for crude oil production and flow stream delivery handling. Numerous methods to identify, prevent or remove corrosion exist from the chemical inhibitors, pipeline alloy selection, coating, isolation, and cathodic protection.CORROSION INHIBITOR WELL PIPELINwhat is a corrosion inhibitortypes of corrosion inhibitorscorrosion inhibitor oil and gascorrosion inhibitor for water treatmentcorrosion inhibitor for steelcorrosion inhibitor chemicalsmarine corrosion inhibitorengine corrosion inhibitorSome results are removed in response to a notice of local law requirement. For more information, please see here.Cited by 7Publish Year 2003Author Richard L. MartinProtecting Pipelines Using Vapor Phase Corrosion InhibitorsInevitable ProblemPipeline Issues Construction, Post-Construction, OperationFacility Issues Equipment, Cui, Storage TanksConclusionPipeline corrosion is inevitable and immediate. The question is how long it will take before the corrosion will eat away enough of the piping to cause a problem. Many factors play into the equation of whether a pipeline will have corrosion problems in five, 10 or 20 years. This depends on the corrosiveness of the pipeline fluid, the thickness of the pipe and the level of corrosion protection. An excellent method for fighting costly corrosioSee more on napipelinesEstimated Reading Time 8 minsPeople also search forvapor phase corrosion inhibitorvapor phase corrosion inhibitor bagphase conductorcorrosion, potentialpower conditioning systemsus domestic terrorism alertGuidelines for corrosion inhibitor selection for oil and CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR including wells, flowlines, pipelines, and process equipment. The methods outlined in this paper are limited to mitigation of internal production water corrosion and, within limits, of condensing water corrosion. The specific methods identified herein are generally for temperatures ranging up to

Common Anticorrosion Methods for Offshore Oil Casing Pipe

Dec 10, 2019Injection of corrosion inhibitor From the completion process, if the formation contains oily corrosive gas, chemical antiseptics will be added to the well fluid to prevent scale, wax and corrosion. Therefore, it is also a common method at home and abroad to use chemical methods to Corrosion Inhibitor - Definition, Types, Examples along CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Corrosion Inhibitors are used to stop rusting and anodic corrosion of metals. This is generally done via the coating of the metal surface with a chromate layer. Oxygen scavengers can be used as CIs to react with dissolved oxygen in the environment and can help in preventing cathodic corrosion. It is very important to prevent rusting and corrosion of fuel pipelines.Corrosion Mechanisms of Buried Pipes - TrenchlesspediaMay 06, 2019Some methods to control pipeline corrosion are Cathodic Protection. This method is used for buried pipelines and uses direct current to fight corrosion in a metal pipeline. It can also prevent corrosion from beginning in a new pipeline and prevent existing corrosion from getting worse. Corrosion Inhibitors

Corrosion of multiphase flow pipelines the impact of CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

Mar 01, 2016The control of multiphase flow corrosion during oil production is a challenging task. In this review, the impact of crude oil on pipeline corrosion is broadly discussed, with the notion to reduce corrosion risks of pipelines in aggressive field conditions. First, the properties, emulsion stability, and multiphase flow patterns of crude oil fluids are concisely summarized and correlated to the CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Corrosion protection of Oil and Gas pipelinesThe method requires periodic shutdowns of individual sections of crude oil pipeline from the main circuit and carrying out of actions on utilization of removed asphaltene-resin-paraffin deposits of crude oil trunk pipelines. The most well-known method of corrosion protection of crude oil pipelines EP2992065A1 - Corrosion inhibitor for protection of crude CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR EP2992065A1 EP14729473.0A EP14729473A EP2992065A1 EP 2992065 A1 EP2992065 A1 EP 2992065A1 EP 14729473 A EP14729473 A EP 14729473A EP 2992065 A1 EP2992065 A1 EP 2992065A1 Authority

Ethanol Corrosion Inhibitors Ecolab

Corrosion inhibitors for ethanol-blended fuels must be capable of providing performance in environments where dissolved water may be present. Salts and acid may also be present in the water, so the ethanol corrosion inhibitor must be capable of performing and protecting steel from corrosion under a range of environmental conditions.Formulation of Corrosion Inhibitors IntechOpenAug 20, 20193. Inhibitors for near-neutral solution. The neutral medium includes circulating cooling water, boiler water, heating water, washing water, oil and gas field injection water and neutral salt water, etc., and the application of corrosion inhibitor is mainly in circulating cooling water system.Guidelines for injection of corrosion inhibitors in oil CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR This publication contains information relating to the technical and management aspects of corrosion inhibitor injection, from identifying the initial need for a corrosion inhibitor, through considerations for selecting the right chemical, practical guidance on their deployment, and ensuring chemical performance by means of appropriate monitoring.

Internal Corrosion Solution for Gathering Production Gas CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

The metallurgy of the corrosion damage over the steel pipeline involving both zone of uniform corrosion as well as special points of localized corrosion. In the past these pipelines received unsuccessful chemical treatments. Both the inhibitor and the dosage were not available. A trial of a new palm oil based corrosion inhibitor was performed.Laboratory Experimental Method for Estimating Inhibition CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Mar 24, 2019ABSTRACT. CO 2 corrosion of mild steel pipeline a common problem that cannot be ignored in the oil and gas industry. At present, a big challenge is to simulate the real corrosive conditions in term of the solution chemistry within a closed system and high gas flow velocity for natural gas field in the deep water in the laboratory, and results in the traditional evaluation methods such as mass CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Material and corrosion in petroleum - SlideShareJan 28, 2013Corrosion inhibitors such as oil soluble 2,5-dimercapto-l,3,4-thiadiazole or hydrocarbyl- substituted 2,5-dimercapto-l,3,4-thiadiazole derivative was used in apatented lubricating composition by Tipton etal. [41]. Na or Ca salt of dinonylnaphthalene-sulfonic acidwas used as a corrosion inhibitor in vegetable oil based lubricants [42].

Method of inhibiting corrosion in acidizing wells (Patent CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

Feb 18, 1992This patent also describes a method of acidizing a subterranean formation by injecting a well treating acid solution down pipe into the well. It comprises preparing the corrosion inhibitor formulation of claim 1; dispersing the formulation in the well treating acid solution to provide the solution with at least 0.08 wt % of the metal salt based CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR People also search forcorrosion inhibitor approved plating houseusing building steel for groundingconductive corrosion inhibitoracidic material from petroleum oilcorrosion inhibitor for steelcorrosion inhibitor for water treatmentCorrosion and Its Inhibition in Water-Based Drilling Fluid CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR The steel sheet test adopts the combined method of the inhibitor and deoxidizer to protect corrosion [8]. Oil field corrosion inhibitors commonly use IMC-03 (phosphorus of imidazoline) corrosion inhibitor [9]. This experiment tested the corrosion rate using the formula one (drilling fluid), formula two (drilling fluid + 1.0% HO-1) and for-People also search forcorrosion inhibitor chemicalscorrosion inhibitor for steelboiler corrosion inhibitorcorrosion inhibitor for water treatmentcorrosion inhibitor msdsmarine corrosion inhibitorTypes of Corrosion Inhibitors and Standardized Methods CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR May 05, 2020Types of Corrosion Inhibitors. Below is a breakdown of the three (3) basic classes of corrosion inhibitors, how they differ in function and application, as well as how their use is regulated for corrosion protection in the oil and gas industry. Classes of Corrosion Inhibitors. Contact Corrosion Inhibitors (CCIs) or simply (CIs)

People also search forcorrosion inhibitor for common household corrosion inhibitor ppmcorrosion inhibitor pdfcorrosion inhibitor lowescorrosion inhibitor for mild steelcorrosion inhibitor wastewater treatmentCorrosion Inhibitor - an overview ScienceDirect Topics

Corrosion inhibitors can be pumped directly to the bottom of the oil or gas well via a macaroni or kill string where well completions allow. If a bottom-hole injection valve is fitted, then a solution of corrosion inhibitor is placed in the annulus and a make-up inhibitor solution added with a suitable pump.People also search forcorrosion inhibitor for mild steelcorrosion inhibiting compound type vicorrosion inhibitor approved plating housecorrosion introduction pdfcorrosion inhibiting compound type viicorrosion inhibitor for coiled tubingPitting Corrosion in Oil and Gas Wells and PipelinesJun 25, 2018Some of the most widely used and effective corrosion mitigation methods used in oil and gas wells and pipelines are discussed below. Corrosion Inhibitors. These are chemicals that are applied to the surface of the metal to suppress the reactions that cause corrosion. Inhibitors work in several ways, including:People also search forcorrosion inhibitor for steelcorrosion inhibitors for water systemsrust inhibitors for steeltypes of corrosion inhibitorsbest rust inhibitors for metalanti corrosion methods and materialsELECTROCHEMICAL METHODS FOR MONITORING The corrosion inhibitor is the main tool used for preventing internal corrosion in carbon steel pipelines, which are used to transport multiphase mixtures from oil production. The successfid selection of corrosion inhibitors depends on a clear understanding of the inhibition performance of the inhibitor under multiphase flow conditions.

People also search forcorrosion inhibitors using drug 2020corrosion inhibitors using drug 2019corrosion inhibitor for your househow do corrosion inhibitors affect water?corrosion inhibitor chemicalsboiler corrosion inhibitorHighly efficient eco-friendly corrosion inhibitor for mild CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

Mar 06, 2019Laurhydrazide N-propan-3-one was used as an eco-friendly inhibitor for the corrosion of mild steel in 5 M HCl at elevated temperatures. Various electrochemical techniques and surface CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR People also search forcorrosion protection sprayintergranular corrosionthread protection sleevecrevice corrosionpotentiodynamic polarizationcathodic corrosion protectionUnderground pipeline corrosion detection, analysis and CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR The methods described in part two for detecting corrosion in underground pipelines include magnetic flux leakage, close interval potential surveys (CIS/CIPS), Pear surveys, in-line inspection, and use of both electrochemical and optical probes. While the emphasis is on pipelines transporting fossil fuels, the concepts apply as well to CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR People also search forcorrosion tests natural gaspipeline corrosion in soilspitting corrosion caused by plasma electrolpitting corrosion caused bypipeline corrosion and cathodic protectionpipeline corrosion and cathodic protectionControl of corrosion in oil and gas production tubingCorrosion inhibition in its various forms is successfully used in many fields. In some cases the success of inhibition can be attributed to the wells being low pressure, low temperature oil wells with little water. There are two main methods for injecting inhibitor into a well stream. The first method

People also search forhow to cite a documentary apaexternal corrosion of pipelinesgas pipeline corrosionoil pipeline corrosionpipeline corrosion 2020pipeline corrosion monitoringCorrosion protection with eco-friendly inhibitors - IOPscience

Oct 31, 2011In the present study, the effect of piperacillin sodium as a corrosion inhibitor for mild steel was investigated using a weight-loss method as well as a three-electrode dc electrochemical technique. It was found that the corrosion rate decreased as the concentration of the inhibitor increased up to 9 × 10 4 M ; 93% efficiency was exhibited CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR People also search forhow to prevent corrosion on residential gahow to remove rust from outside gas pipehow to refine crude oil rustoxygen absorption corrosion and co2 corropipeline corrosion and cathodic protectionhow to cite a documentary apaCrude Oil Well Corrosion Inhibitor Oilfield Chemical CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Corrosion Inhibitor additive avoids corrosion in the production well and gathering system caused by water associated with crude oil production before the corrosion eats away the profits due to increased costs. Corrosion is an ever present issue for crude oil production and flow stream delivery handling. Numerous methods to identify, prevent or CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR People also search foris acetylcholine a substrateakzo nobel power to methanolare ribosomes a substratehydrogen peroxide and yeast enzymedoes ethanol corrode steelGreen Corrosion Inhibitory Potentials of Cassava Plant CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Internal and external corrosion affects oil and gas pipelines and were discussed in this chapter. Corrosion inhibitors are one of the methods that can be used to achieve corrosion control and prevention. The main discussion in this chapter was the use of cassava plant (Manihot esculenta Crantz) extract nanoparticles (CPENPs) as an additive in coatings to serve as a green corrosion inhibitor CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

People also search fornrcs corrosion protection for buried metal underground corrosion for buried metal pipesrepair corrosion on brass pipesnrcs cathodic protection for buried metal pipaint on water proofing membrbae for steelcorrosion on water pipesHow to Inhibit Corrosion in Pipelines for Oil and Gas DXP

Jul 14, 2018Using oils and lubrication for corrosion control in oil and gas pipelines is one method that has proven effective. Many oil-based rust removers are also safe for rubber or plastics. If using a rust remover, theres the benefit of deep penetration into all metal pores of the pipe, and if only a little rust has accumulated, it is easy to dissolve.People also search forpipeline corrosion inhbitor filming rsicorrosion inhibitor wastewater treatmentare corrosion inhibitors flammablehydrogen peroxide corrosion compoundchecking for leaks in pipelineswill hydrogen peroxide corrode metalCorrosion Inhibitors and their Selection (With PDF) What CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Corrosion Inhibitor is used in the oil & gas industry by continuous treatment via annulus or small tubing, batch treatment, tubing displacement, and squeeze treatment by adsorbing. In gas lift wells CI is introduced with the gas. Possible issues for continuous treatment via annulus flashing & gunking, slugging, valves plugging, CI degradation CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR People also search fortypes of corrosion inhibitor for mild steelthypes of corrosion inhibitor for mild steelcooling tower corrosion inhibitor economicsalkali corrosion plantfilming forming corrosion inhibitorfilming corrosion inhibitorEvaluation of corrosion inhibitors effectiveness in CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR developing corrosion inhibitors for applications where ultra-high shear conditions caused server localized corrosion in gas pipelines. The test has often been called a rotating cage test. In the normal procedure, a mixture of brine/hydrocarbon is added to the autoclave. After purging/

People also search fortypes of corrosion inhibitors for atomspherictypes of corrosion inhibitors effective agiantypes of corrosion inhibitor for mild steelthypes of corrosion inhibitor for mild steelcorrosion inhibitor marketing costcorrosion inhibitor for mild steelDevelopment of New Laboratory Test Methods for

May 09, 2016Recently, we have developed a laboratory test method involving a relatively rapid screening stage followed by testing at more field-representative conditions, to determine TOL corrosion rates as well as to qualify the effectiveness of corrosion inhibitors designed to provide effective control against both TOL and bottom of the line (BOL) corrosion. The method, which includes techniques for ambient-pressure testing as well People also search forviscosity of water at 25 cnace standard scale brinepentaho kettle input never endsnace standard iron scale brinenace standard brinerotating fluid cylinder shear stress from wallsCorrosion Inhibitors for Oil and Gas Production CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR A discussion on the bacteria-induced corrosion is provided. The article also explains various tests available for field corrosion monitoring. It details the methods used to monitor corrosion rates and inhibitor effectiveness. The article concludes information on the computerization of inhibitor People also search forwhat's corrosion inhibitor aidfield test of corrosion inhibitordifference between corrosion inhibitor and corrosion inhibitor apllication reliability .pdflowering voltage with componentscorrosion inhibitors pdfWhat is a Pipeline Corrosion Inhibitor? - Definition from CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Jul 22, 2020A pipeline corrosion inhibitor is a chemical compound that halts or slows down the corrosion process in a pipeline. The inhibitor works by reacting with the fluid in the pipe, making it more inert and less likely to corrode the piping. Pipeline corrosion inhibitors can be applied either directly to the well formation or by injecting it at regular intervals in the pipeline using special valves.

People also search forworking temperature corrosion inhibitorcorrosion inhibitor apllication reliability .pdfcorrosion tests natural gascorrosion inhibitor for steelcorrosion inhibitor for water treatmentboiler corrosion inhibitorCorrosion Inhibitors Principles, Mechanisms and

Corrosion Inhibitors Principles, Mechanisms and CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR the corrosion inhibitor is one of the best know methods of corrosion protection and one of the most useful on the industry. This method is following stand up due to low cost and practice CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR such as development construction of new pipelines for shale gas and growth in construction.Recent Natural Corrosion Inhibitors for Mild Steel An CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR Jul 14, 2016Traditionally, reduction of corrosion has been managed by various methods including cathodic protection, process control, reduction of the metal impurity content, and application of surface treatment techniques, as well as incorporation of suitable alloys. However, the use of corrosion inhibitors has proven to be the easiest and cheapest method for corrosion protection and Research on Corrosion Protection of Buried Steel Pipelinecorrosion inhibitors, this corrosion inhibitor had obvious corrosion resistance for Xia Yibai pipeline, it could extend service life of pipeline for more than 40 years, with an average reduction of repair costs about $100 thousand. Yinlong Zhang [11] screened the corrosion inhibitor in

Review of Testing Methods and Standards for Oilfield CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

Review of Testing Methods and Standards for Oilfield Corrosion Inhibitors CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR using inhibitors to control internal corrosion of pipelines, the widespread use of inhibitors, CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR and RDE may be used to screen inhibitors. These methodologies have well-established flow patterns that are well-characterized. ;:THE ASSESSMENT OF CORROSION IN PIPELINES identifies what are generally recognised as the best methods for assessing corrosion, and (5) presents the key considerations when assessing a corrosion defect in a pipeline. 6 CORROSION IN PIPELINES Corrosion is an electrochemical process. It is a time dependent mechanism and depends on the local environment within or adjacent to the CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR This depends on the corrosivenessof the pipelinefluid, the thickness of the pipe and the level of corrosionprotection. An excellent methodfor fighting costly corrosionissues and encouraging the longest possible service life is the use of Vapor phase CorrosionInhibitors(VpCIs).Protecting Pipelines Using Vapor Phase Corrosion InhibitorsWas this helpful?People also askHow are corrosion inhibitors applied to oil and gas pipelines?How are corrosion inhibitors applied to oil and gas pipelines?Pipeline corrosion inhibitors can be applied either directly to the well formation or by injecting it at regular intervals in the pipeline using special valves. Oil and gas processes and activities, such as drilling and extraction, use aggressive chemicals that can be detrimental to steel pipelines.What is a Pipeline Corrosion Inhibitor? - Definition from CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR

Top 5 Benefits of Using Corrosion Inhibitors

There are various methods been used with corrosion inhibitor. One of the method been used is the Electrochemical methods. The advantage with this method is their short measurement time and mechanistic information. It is helpful in design of the corrosion protection strategies as well as the design of the new inhibitorsVOLATILE CORROSION INHIBITORS USED FOR the pipeline and open in direction of vessels and columns since the quantity of volatile corrosion inhibitor introduced in the column and vessels has been evaluate d for the volume of pipeline as well. Should the period of conservation be extended, it is possible to introduce powdered inhibitors in the pipeline. 3.1.5 Process HeaterWO2014178737A1 - Corrosion inhibitor for protection of CORROSION INHIBITOR WELL PIPELINE AND METHOD FOR The corrosion inhibitor for protection of crude oil extraction equipment, crude oil pipelines, and crude oil tanks, which contains - component a) produced as a result of the performance of the following processes A) - partial neutralization of the new mixture of modified imidazoline derivatives, of general formulas (1) and (2) wherein R 2 - C 2 -C 12 with the possible addition of compound () wherein R 3

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