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Composite inhibiter and preparation method and application thereof

A kind of corrosion inhibitor and composite technology, which is applied in the fields of processing equipment corrosion/fouling inhibition, petroleum industry, processing hydrocarbon oil, etc. It can solve the problems of single application range, narrow application range of corrosion inhibitor and poor dispersion performance.

Active Publication Date: 2009-12-30
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a novel composite corrosion inhibitor in order to overcome the disadvantages of the above-mentioned corrosion inhibitors, such as narrow pH range, single application range, poor dispersion performance in aqueous solution, etc.

Method used

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  • Composite inhibiter and preparation method and application thereof
  • Composite inhibiter and preparation method and application thereof
  • Composite inhibiter and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0037] Embodiment 1~3 is the preparation example of two imidazoline quaternary ammonium salts:

Embodiment 1

[0039] Put adipic acid and diethylenetriamine into the reactor according to the molar ratio of 1:2.2, add boric acid accounting for 0.2% by weight of the feeding amount, and gradually heat up to 230°C under constant stirring, and the temperature rise reaction time is 4 hours to obtain bis-imidazoline Intermediate: After cooling to below 60°C, slowly add benzyl chloride reagent according to the molar ratio of 1:2. After the addition, react at a temperature of 90-110°C for 3 hours, and obtain bis-imidazoline quaternary ammonium salt A1 after cooling.

Embodiment 2

[0041] According to the similar method of preparing bis-imidazoline quaternary ammonium salt A1 in Example 1, the benzyl chloride reagent is replaced by hypochlorous acid and sodium hypochlorite mixture with a molar ratio of 1: 2, and the bis-imidazoline intermediate and the quaternization reagent mol ratio are 1 : 3, prepared bis-imidazoline quaternary ammonium salt A2.

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PUM

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Abstract

The invention discloses a composite inhibiter and a preparation method and an application thereof. The composite inhibitor is a composition with the components and contents being as follows: (A) 10wt%-60wt% of auaternary ammonium bis-imidazoline; (B) 1wt%-10wt% of pyridine derivatives; (C) 1wt%-30wt% of corrosion inhibition assistant; and (D) 10wt%-50wt% of solvent. The inhibitor in the invention has fine effect on preventing low-temperature lightweight oil part equipment from being corroded in an oil refinery.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and relates to a composite corrosion inhibitor for preventing equipment corrosion, a preparation method and application thereof. Background technique [0002] With the in-depth development of crude oil, the proportion of low-quality crude oil is increasing, resulting in increasingly serious corrosion problems in refinery equipment. Among them, the corrosion of low-temperature light oil equipment in primary and secondary processing equipment is particularly prominent, such as the top of the atmospheric and vacuum equipment. Condensation cooling system, catalytic cracking stable absorption system and delayed coking fractionation overhead condensation cooling system. The corrosion of the condensation cooling system at the top of the atmospheric and vacuum unit is mainly caused by H 2 S-HCl-H 2 O-type corrosion, the corrosion of catalytic cracking stable absorption system is mainly HCN-H 2 S-H 2...

Claims

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Application Information

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IPC IPC(8): C10G75/02
Inventor 于凤昌段永锋彭松梓李春贤王红梅李朝法刘希武唐应彪
Owner CHINA PETROCHEMICAL CORP
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