Preparation method of thiosemicarbazide imidazoline derivative corrosion inhibitor

A thiosemicarbazide-based imidazoline and derivative technology is applied in the field of preparation of a thiosemicarbazide-based imidazoline derivative corrosion inhibitor, and can solve the problems of low corrosion inhibition efficiency, high cost, low slow release efficiency and the like, Achieve the effect of improving economic benefits, inhibiting corrosion and increasing corrosion inhibition efficiency

Inactive Publication Date: 2015-07-15
成都石大力盾科技有限公司
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  • Abstract
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Problems solved by technology

[0002] At present, the corrosion inhibition efficiency of the existing corrosion inhibitors under acidic conditions is low, especially in the application of carbon dioxide-containing oil and gas fields.
However, CO 2 Corrosion is a common type of corrosion in the process of oil and gas field development. In the prior art, imidazoline organic corrosion inhibitors have been used to resist CO 2 It is widely used in corrosion, and imidazoline thiourea benzoate is a kind of imidazoline corrosion inhibitor that is widely used, but the existing imidazoline corrosion inhibitors are used in the anti-CO 2 The corrosion performance is not very ideal, and there are disadvantages of low slow-release efficiency and high cost

Method used

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  • Preparation method of thiosemicarbazide imidazoline derivative corrosion inhibitor

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preparation Embodiment 1

[0021] A preparation method of a thiosemicarbazide based imidazoline derivative corrosion inhibitor, comprising the steps of:

[0022] (1) Dissolve 0.05mol (6.1g) of benzoic acid and 9.6mL of water-carrying agent xylene at a volume ratio of 1:2 (the volume of benzoic acid is calculated by the relative density of benzoic acid), and heat up to 100°C , start to drop triethylenetetramine 0.1mol (14.6g) in the bottle, the dripping of triethylenetetramine adopts the constant pressure dropping funnel to carry out dropwise addition, and the dripping speed is controlled at 10s / drop, wait for triethylenetetramine to drip After the addition was completed, the temperature was raised to 150°C for reflux reaction for 2.0 hours to obtain the amidation product; the temperature was then raised to 220°C for ring formation reaction, and the reaction was stopped when no more water was generated. The reaction time was 2.0 hours, and the reaction time was reduced Xylene was evaporated to obtain 9....

preparation Embodiment 2

[0026] A preparation method of a thiosemicarbazide based imidazoline derivative corrosion inhibitor, comprising the steps of:

[0027] (1) Dissolve 0.05mol (6.1g) of benzoic acid and 9.6mL of water-carrying agent xylene at a volume ratio of 1:2 (the volume of benzoic acid is calculated by the relative density of benzoic acid), and heat up to 105°C , start to drop triethylenetetramine 0.05mol (7.3g) in the bottle, the dripping of triethylenetetramine adopts the constant pressure dropping funnel to carry out dropwise addition, and the dripping speed is controlled at 8s / drop, wait for triethylenetetramine to drip After the addition was completed, the temperature was raised to 140°C for reflux reaction for 2.2 hours to obtain the amidation product; the temperature was then raised to 230°C for ring formation reaction, and the reaction was stopped when no more water was generated. The reaction time was 2.2 hours, and the reaction was reduced Xylene was evaporated to obtain 8.47 g o...

preparation Embodiment 3

[0031] A preparation method of a thiosemicarbazide based imidazoline derivative corrosion inhibitor, comprising the steps of:

[0032] (1) Dissolve 0.1mol (12.2g) of benzoic acid and 21.2mL of water-carrying agent xylene at a volume ratio of 1:2 (the volume of benzoic acid is calculated by the relative density of benzoic acid), and heat up to 95°C , start to drop triethylenetetramine 0.1mol (7.3g) in the bottle, the dripping of triethylenetetramine adopts the constant pressure dropping funnel to carry out dropwise addition, and the dripping speed is controlled at 12s / drop, wait for triethylenetetramine to drip After the addition was completed, the temperature was raised to 160°C for reflux reaction for 1.8 hours to obtain the amidation product; the temperature was then raised to 250°C for ring formation reaction, and the reaction was stopped when no more water was generated. Xylene was evaporated to obtain 16.24 g of cyclized imidazoline intermediate, with a yield of 70%;

...

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Abstract

The invention discloses a preparation method of a thiosemicarbazide imidazoline derivative corrosion inhibitor. The preparation method comprises the following steps: firstly reacting benzoic acid with triethylene tetramine to synthesize a cyclization imidazoline intermediate, then reacting the cyclization imidazoline intermediate with benzyl chloride to obtain quaternization benzoic acid imidazoline, and finally reacting the quaternization benzoic acid imidazoline with thiosemicarbazide to obtain a final product. The imidazoline derivative corrosion inhibitor prepared by the method has the advantages of high controlled-release efficiency and low cost.

Description

technical field [0001] The invention relates to a preparation method of a thiosemicarbazide-based imidazoline derivative corrosion inhibitor. Background technique [0002] The corrosion inhibition efficiency of the existing corrosion inhibitors under acidic conditions is low, especially in the application of carbon dioxide-containing oil and gas fields. However, CO 2 Corrosion is a common type of corrosion in the process of oil and gas field development. In the prior art, imidazoline organic corrosion inhibitors have been used to resist CO 2 It is widely used in corrosion, and imidazoline thiourea benzoate is a kind of imidazoline corrosion inhibitor that is widely used, but the existing imidazoline corrosion inhibitors are used in the anti-CO 2 The corrosion performance is not very satisfactory, and there are disadvantages of low slow-release efficiency and high cost. Contents of the invention [0003] The object of the present invention is to provide a method for prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02
Inventor 何毅马兰陈丽郭睿
Owner 成都石大力盾科技有限公司
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