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Process for preparing cycloalkanoimide betaine and use thereof

A technology of naphthenic acid amide and betaine, which is applied in the preparation and application field of naphthenic acid amide betaine, can solve the problems of waste of ammonia water, large fluctuation range of pH value, corrosion can not be effectively inhibited, etc., and achieve the process operation flow The effect of simplification, product cost reduction, and excellent corrosion inhibition performance

Inactive Publication Date: 2006-12-27
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technological measure can better prevent HCl-H 2 S-H 2 O corrosion, but there are still two major deficiencies: one is that the on-site pH value fluctuation range is too large, which is difficult to control
The on-site pH value is generally controlled above 8.5, which not only causes a great waste of ammonia water, but also easily causes the crystallization of NH4Cl, serious scaling on the surface of the equipment, blockage of the equipment and lead to corrosion under the scale, affecting the safe operation of the equipment
The second is that due to the high vapor pressure of ammonia, it is difficult to enter the liquid phase in the initial condensation area and the acidic medium that causes dew point corrosion, which cannot effectively inhibit the corrosion of the dew point in the initial condensation area, making the pitting corrosion of the volatile line at the top of the atmospheric pressure tower serious phenomenon
In addition, the inventor has not yet seen relevant reports on the application of naphthenic acid amide betaine

Method used

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  • Process for preparing cycloalkanoimide betaine and use thereof
  • Process for preparing cycloalkanoimide betaine and use thereof
  • Process for preparing cycloalkanoimide betaine and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In a 500mL four-neck flask equipped with stirring, dropping funnel, thermometer and reflux condenser, add naphthenic acid that has just been synthesized and cooled to 109°C with an acid value of 14.60 mgKOH / g and an amine value of 219.05 mgKOH / g Amide 51.0g (equivalent to 0.0995 moles of cycloalkyl), according to the molar ratio of the cycloalkyl contained in the naphthenic acid amide and the sodium chloroacetate contained in the sodium chloroacetate solution is 1.0:3.0, under stirring, add the prepared 31.18% sodium chloroacetate solution 111.5g (wherein containing 0.2985 moles of sodium chloroacetate), then gradually warming up reaction under stirring. At the beginning, the reaction speed is faster, and the reaction temperature is controlled at a lower range of 50-60°C. As the reaction proceeds, the pH value of the reaction solution decreases. In order to ensure the continuation of the reaction, the pH value of the reaction solution is controlled by dropping 30% NaOH ...

Embodiment 2

[0052] In a 500mL four-neck flask equipped with a stirring, dropping funnel, thermometer and reflux condenser, add 142.9g of a prepared 38.20% sodium chloroacetate solution (containing 0.4684 moles of sodium chloroacetate), press the naphthenic acid amide The molar ratio of the cycloalkyl group and the sodium chloroacetate contained in the sodium chloroacetate solution is 1.0:4.0, and the naphthenic acid amide 60.0 with an acid value of 14.60 mgKOH / g and an amine value of 219.05 mgKOH / g is added under stirring. g (equivalent to 0.1171 moles of cycloalkyl), and then gradually heat up the reaction under stirring. At the beginning, the reaction speed is faster, and the reaction temperature is controlled at a lower range of 50-60°C. As the reaction proceeds, the pH value of the reaction solution decreases. In order to ensure that the reaction continues, the pH value of the reaction solution is controlled by dropping 30% NaOH solution, and the pH value is controlled in the range of...

Embodiment 3

[0055] In a 500mL four-neck flask equipped with stirring, dropping funnel, thermometer and reflux condenser, 170.0g of a prepared 38.20% sodium chloroacetate solution (containing 0.5575 moles of sodium chloroacetate) was first charged, and the The cycloalkyl group contained in the imidazoline and the sodium chloroacetate contained in the sodium chloroacetate solution have a molar ratio of 1.0:5.0, and slowly add a ring with an acid value of 5.79 mgKOH / g and an amine value of 240.63 mgKOH / g under stirring. 52.0 g of imidazoline alkanoate (equivalent to 0.1115 moles of cycloalkyl) was then gradually heated up for reaction under stirring. At the beginning, the reaction speed is faster, and the reaction temperature is controlled at a lower range of 50-60°C. As the reaction proceeds, the pH value of the reaction solution decreases. Therefore, in order to ensure that the reaction continues, the pH value of the reaction solution is controlled by dropping 30% NaOH solution, and the pH...

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Abstract

The invention relates to a method for preparing naphthenic acid amide beet alkali and its application. Naphthenic acid amide or naphthenic acid imidazoline or mixture of them reacts with sodium monochloracetate, the molar proportion between naphthene base in naphthenic acid amide or imidazoline and sodium monochloracetate is 1.0: 4.8- 7.0, temperature is at 50-95 Deg. C, pH is about 10, and the reaction time is 8-18 hours. The product is used as water-soluble inhibitor for HCL-H2S-H2O system. The invention is characterized by low cost and simple process. The inhibiting property of said product is sound and compatibility with organic amine is good.

Description

technical field [0001] The invention relates to a preparation method of naphthenic acid amide betaine and its application as a water-soluble corrosion inhibitor. Background technique [0002] Naphthenic acid is mainly derived from the second and third line alkali residues of petroleum refining. At present, my country has more than 30,000 t / a of naphthenic acid resources, but the resource utilization rate is low. Except for a small amount of direct use as aviation fuel additives and mineral flotation agents, most of them are used in the production of naphthenic acid salts. The development and application of alkanoic acid derivatives, especially in aqueous media, is not enough. In the past, because the purity of naphthenic acid did not improve, when the corresponding organic derivatives synthesized were applied to aqueous media, a large amount of annoying oily substances were precipitated. In recent years, with the development of a complete set of technology for the preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/62C07C231/12C10G75/02C10G7/10
Inventor 石顺存邓彤彤蒋华鹏方茹苕盛洁唐胜利
Owner HUNAN UNIV OF SCI & TECH
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