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A kind of polymerized imidazoline corrosion inhibitor and preparation method thereof

An imidazoline corrosion inhibitor and a selected technology are applied in the field of corrosion inhibitor preparation for oilfield sewage pipelines and water injection pipelines, which can solve the problems of no imidazoline corrosion inhibitor, avoid unevenness of pipelines, inhibit corrosion and reduce operation. The effect of energy consumption

Inactive Publication Date: 2015-12-02
SICHUAN RENZHI PETROCHEMICAL TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports of polymeric imidazoline corrosion inhibitors

Method used

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  • A kind of polymerized imidazoline corrosion inhibitor and preparation method thereof
  • A kind of polymerized imidazoline corrosion inhibitor and preparation method thereof
  • A kind of polymerized imidazoline corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 120ml of polyacrylic acid solution (solid content 30%, molecular weight 2000-4000) into a 500ml three-neck flask equipped with a condenser, water separator and dropping funnel, stir mechanically, heat to 100°C, and dropwise add 68ml of diethylene Triamine and 40ml xylene solution. Water and xylene were separated from the water separator, and the reaction mixture gradually turned light yellow. The xylene in the upper layer of the water separator can be returned to the reaction system. After 5 hours of reaction, the temperature is raised to 200°C until no more water is released. At this time, the total amount of water separated should be equivalent to the amount of water generated by the stoichiometric system. Cool to 90°C, add 82ml of benzyl chloride dropwise with a dropping funnel under agitation to carry out alkylation reaction. After 3h the reaction was complete and cooled. The product was distilled off under reduced pressure to remove excess unreacted small mol...

Embodiment 2

[0026] Add 72ml of polyacrylic acid solution into a 250ml four-neck flask equipped with a condenser, water separator, thermocouple and dropping funnel, stir mechanically, heat to 130°C, add dropwise 37ml of hydroxyethylethylenediamine and 40ml of di solution in toluene. The reaction mixture gradually turned yellow-brown as water and xylene were separated from the water trap. After 4 hours of reaction, the temperature was raised to 210° C., and no more water came out after 4.5 hours. Cool to 90°C, add 42ml of benzyl chloride dropwise with a dropping funnel under agitation to carry out alkylation reaction. After about 4h, the reaction was completed and cooled. The product was distilled off under reduced pressure to remove excess unreacted small molecule raw materials to obtain light brown polyimidazoline corrosion inhibitor 2.

[0027] Corrosion test:

[0028] Put the metal test piece into acetone and ethanol and ultrasonically clean it for 30 minutes to remove oil and fat, ...

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Abstract

The invention provides an oil field iron steel material corrosion inhibitor and a preparation method thereof. The corrosion inhibitor is a homopolymer of alkyl imidazoline, and the molecular weight of the homopolymer is 2000-6000. The preparation method mainly comprises the following three steps: firstly, enabling low polyacrylic acid to react with a polyamine compound to prepare polypropylene acid-base imidazoline; secondly, enabling the polypropylene acid-base imidazoline to react with benzyl chloride to prepare alkyl polypropylene acid-base imidazoline; thirdly, performing reduced pressure distillation to separate out unreacted excessive micromolecular raw materials. According to the invention, the novel polymer corrosion inhibitor can be used for forming multi-point adsorption on a metal surface through multiple imidazoline heterocyclic ring groups in molecules, so that the binding force of the corrosion inhibitor on the metal surface is enhanced, and further the corrosion inhibition efficiency is improved.

Description

technical field [0001] The invention relates to a corrosion inhibitor anticorrosion technology for iron and steel materials, in particular to a method for preparing corrosion inhibitors for oil field sewage pipelines and water injection pipelines. Background technique [0002] The petroleum industry is one of the industries most plagued by corrosion. The environment in the development of oil and gas fields is complex, and various production strings and gathering and transportation pipelines are often severely corroded, causing huge economic losses. The most commonly used anti-corrosion method in various oil fields is to add corrosion inhibitors, which is economical and effective without affecting the normal production of oil fields. The corrosion inhibitors currently used mainly include polyamines, Mannich bases, nitrogen-containing heterocyclic compounds such as pyridine and imidazoline, organic phosphorus, acetylenic alcohols, and alkynyloxymethylamines, etc. These organic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/173
Inventor 唐能攀汪俊姚兵操卫平黄可明
Owner SICHUAN RENZHI PETROCHEMICAL TECHNOLOGY CO LTD