Water-soluble corrosion inhibitor, preparation and application thereof

A corrosion inhibitor, water-soluble technology, used in the treatment of equipment corrosion/fouling inhibition, petroleum industry, hydrocarbon oil treatment, etc., can solve the problem of narrow use range, and achieve low cost, good water solubility, low toxicity and no odor on site effect of operation

Inactive Publication Date: 2008-10-08
LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the disadvantages of the narrow pH range of the corrosion inhibitor in the prior art, and provides a novel water-soluble corrosion inhibitor, which can be used for metal materials in a medium with a wide pH value change (pH=1-10). Corrosion inhibition effect, and has good metal surface film-forming performance

Method used

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  • Water-soluble corrosion inhibitor, preparation and application thereof
  • Water-soluble corrosion inhibitor, preparation and application thereof
  • Water-soluble corrosion inhibitor, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Put oleic acid and diethylenetriamine into the reactor according to the molar ratio of 1:1.1, add boric acid accounting for 0.2% by weight of the feeding amount, gradually raise the temperature to 230° C. under constant stirring, and the temperature rise reaction time is 4 hours to obtain the imidazoline intermediate . Then the imidazoline intermediate and thiourea are added to the reactor according to the molar ratio of 1:1, and 15% by weight of n-hexanol accounting for the total weight of the imidazoline intermediate and thiourea is added, and the reaction is carried out at a temperature of 140 to 170° C. for 3 hours After cooling to below 60°C, slowly add benzyl chloride reagent according to the molar ratio of 1:1.5, react at 90-110°C for 3 hours after the addition, and obtain a brown imidazoline derivative A after cooling.

Embodiment 2

[0044] According to the method similar to the preparation of imidazoline derivative A in Example 1, triethylenetetramine was used instead of diethylenetriamine to prepare imidazoline derivative B.

Embodiment 3

[0046] According to the method similar to the preparation of imidazoline derivative A in Example 1, oleic acid was replaced by linoleic acid to prepare imidazoline derivative C.

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Abstract

The invention discloses a water soluble corrosion inhibitor, the preparation method and the application of the corrosion inhibitor, solving the defect of narrow application range of the corrosion inhibitor pH in the prior art; the water soluble corrosion inhibitor is composed of 20-70 weight proportion of imidazolines derivates, 1-10 weight proportion of pyridine derivates, 1-20 weight proportion of corrosion inhibition auxiliary agent and 10-50 weight proportion of solvent, based on the total weight of the corrosion inhibitor as the reference. The water soluble corrosion inhibitor in the invention has corrosion inhibition effect on the metal material in the medium with wide PH variation range (pH equals to 1-10) and good metal surface film formation property.

Description

technical field [0001] The invention belongs to the field of metal corrosion inhibition, and more specifically relates to a water-soluble corrosion inhibitor for preventing corrosion of low-temperature light oil part equipment in an oil refinery, 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/02
Inventor 于凤昌段永锋彭松梓李春贤王红梅
Owner LUOYANG PETROCHEMICAL ENG CORP SINOPEC
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