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Compound, corrosion inhibitor composition containing compound, and preparation method and application of corrosion inhibitor

A composition and compound technology, applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., can solve problems such as low corrosion inhibition efficiency of corrosion inhibitors

Pending Publication Date: 2022-03-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a compound for alleviating the corrosion effect of weakly alkaline oilfield produced water on the transmission pipeline, a corrosion inhibitor composition comprising the compound and a preparation method and application of the corrosion inhibitor to solve the problem of weakly alkaline oilfield The problem of low corrosion inhibition efficiency of existing corrosion inhibitors in produced water

Method used

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  • Compound, corrosion inhibitor composition containing compound, and preparation method and application of corrosion inhibitor
  • Compound, corrosion inhibitor composition containing compound, and preparation method and application of corrosion inhibitor
  • Compound, corrosion inhibitor composition containing compound, and preparation method and application of corrosion inhibitor

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preparation example Construction

[0041] According to another aspect of the present invention, a preparation method of the above-mentioned compound is provided, the preparation method comprising the following steps:

[0042] Step S1: Put HOOC(CH 2 ) n COOH reacts with thiourea to generate a dithiourea-based intermediate, which is represented by the following general formula 2:

[0043]

[0044] Among them, n is an integer, and 2≤n≤5;

[0045]Step S2: reacting the dithiourea-based intermediate with phosphoric acid to generate the compound.

[0046] In the method of the present invention, adopt starting material HOOC (CH 2 ) n COOH (wherein n is an integer, and 2≤n≤5, specifically n can be 2, 3, 4, 5) reacts with thiourea to obtain a dithiourea-based intermediate, and then reacts the intermediate with phosphoric acid, which can To obtain the desired compound with corrosion inhibition properties. Among them, HOOC (CH 2 ) nCOOH has a double carboxyl molecular structure, which reacts with thiourea first, ...

preparation example 1

[0082] Preparation Example 1: Preparation of bis-N(N'(phosphite)-thiourea)-1,4-succinamide

preparation example 1a

[0084] Add 1 mol of succinic acid into a three-necked flask with mechanical stirring, add 0.6 mol of xylene, and after stirring fully, start to slowly add 2.1 mol of thiourea when heating to 95°C under the protection of nitrogen. °C / min to 120°C, and then 8°C / h to slowly increase the temperature to 190°C to obtain a dithiourea-based intermediate product;

[0085] Take the above intermediate product, add 2mol of phosphoric acid, react at 80°C for 1.5h, and the reaction is complete when the system does not emit water, and the product bis-N(N'(phosphorous acid)-thiourea)-1,4-succinamide is obtained.

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Abstract

The invention relates to a compound, a corrosion inhibitor composition containing the compound, and a preparation method and application of a corrosion inhibitor. The present invention provides a compound represented by General Formula 1: wherein n is an integer, and 2 < = n < = 5. The invention also provides a corrosion inhibitor composition, the composition comprises a first scale inhibitor, the first scale inhibitor is a compound represented by a general formula 1, and preferably, the content of the first scale inhibitor in the composition is 10-20wt%. The invention further provides a method for relieving corrosion of oilfield produced water to a conveying pipeline. The method comprises the step of treating the oilfield produced water by adopting the corrosion inhibitor. According to the invention, the corrosion inhibition efficiency can be obviously improved, and the corrosion effect of alkalescent produced water on a metal material conveying pipeline is avoided.

Description

technical field [0001] The invention relates to the field of metal corrosion and protection, in particular to a compound, a corrosion inhibitor composition containing the compound, and a preparation method and application of the corrosion inhibitor. Background technique [0002] With the continuous development of my country's oilfields, the oilfields have gradually entered the medium and high water cut period, and the water content of crude oil produced by some oilfields is even as high as 90%. In recent years, domestic oil fields usually adopt the method of reinjection of produced water to achieve the purpose of saving energy and reducing consumption. The method of reinjection of produced water into the formation has obvious advantages, not only can avoid the environmental pollution caused by sewage discharge, but also is an important measure to stabilize and increase production in oilfields. The composition of oilfield produced water is relatively complex, generally conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/24C23F11/167
CPCC07F9/2487C23F11/1673
Inventor 亓树成靳军岳新建丁湘华田波阙庭丽艾肯江·吾不力哈斯木魏云刘建荣张玉萍
Owner PETROCHINA CO LTD