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Method for preparing naphthenic acid imidazolines and betaine of amide thereof, and application of the same in HCl-H2S-H2O system

A technology of naphthenic acid imidazoline and betaine, applied in the direction of organic chemistry, etc., can solve the problems of waste of ammonia water, large pH fluctuation range, inability to effectively inhibit corrosion, etc., and achieves simplified process operation, reduced product cost, The effect of excellent corrosion inhibition performance

Inactive Publication Date: 2008-06-04
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 imidazoline and its amides to betaine

Method used

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  • Method for preparing naphthenic acid imidazolines and betaine of amide thereof, and application of the same in HCl-H2S-H2O system
  • Method for preparing naphthenic acid imidazolines and betaine of amide thereof, and application of the same in HCl-H2S-H2O system
  • Method for preparing naphthenic acid imidazolines and betaine of amide thereof, and application of the same in HCl-H2S-H2O system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In a 500mL four-necked flask equipped with a stirring, dropping funnel, thermometer and reflux condenser, add the newly synthesized and cooled to 109°C made of naphthene with an acid value of 5.60 mgKOH / g and an amine value of 267.30 mgKOH / g Naphthenic acid imidazoline (abbreviated as imidazoline A, the same below) 75.5 g (equivalent to 0.120 moles of cycloalkyl) synthesized by acid and triethylenetetramine, according to the cycloalkyl contained in the naphthenic imidazoline and chloroacetic acid solution The molar ratio of the contained chloroacetic acid is 1.0:4.1, and 103.3 g of a prepared 45.0% chloroacetic acid solution (0.492 moles of chloroacetic acid) is added under stirring, and then the temperature is gradually raised under stirring. At the beginning, the reaction speed is faster, and the reaction temperature is controlled at a lower 60-70°C. As the reaction proceeds, the pH value of the reaction solution decreases. To ensure the continuation of the reaction, ...

Embodiment 2

[0053] In the same four-necked flask as in Example 1, add 38.20% sodium chloroacetate solution 183.0 g (sodium chloroacetate 0.60 moles), press the cycloalkyl group contained in the naphthenic acid imidazoline and the chloroacetic acid contained in the sodium chloroacetate solution The molar ratio of sodium is 1.0:10.0, and 37.8 g of imidazoline A (equivalent to 0.06 moles of cycloalkyl) is added under stirring, and then the temperature is gradually raised under stirring, and the reaction temperature is controlled at 50-60°C. As the reaction proceeds, the pH value of the reaction solution decreases. To ensure the continuation of the reaction, the pH is controlled to be 7-8.5 by dropwise adding 30% NaOH solution. Simultaneously, as the reaction proceeds, the reaction rate will decrease. In order to ensure the drop rate of NaOH solution at a pH value of 7 to 8.5, the reaction temperature will gradually increase. Finally, rise to 85-90°C. When the reaction reached 9h, the dropwi...

Embodiment 3

[0056] In the same four-necked flask as in Example 1, add 38.20% sodium chloroacetate solution 155.5g (0.51 moles of sodium chloroacetate), press the cycloalkyl group contained in the naphthenic acid imidazoline and the chloroacetic acid contained in the sodium chloroacetate solution The molar ratio of sodium is 1.0:5.1, and under stirring, add naphthenic acid imidazoline (referred to as imidazoline) synthesized by naphthenic acid and tetraethylenepentamine with an acid value of 4.61 mgKOH / g and an amine value of 297.32 mgKOH / g. B, the same below) 75.5g (equivalent to cycloalkyl 0.10 mole), then gradually heat up under stirring. At the beginning, the reaction speed is fast, and the reaction temperature is controlled at 50-60°C. As the reaction proceeds, the pH value of the reaction solution decreases. Therefore, in order to ensure the continuation of the reaction, the pH value of the reaction solution is controlled to be 8.5-10 by dropping 30% NaOH solution. Simultaneously, a...

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Abstract

The invention relates to a preparation method of naphthenic acid imidazoline and the lycine of amide thereof and the application thereof in an HCl-H2S-H2O system. The naphthenic acid imidazoline reacts with chloroactic acid or sodium chloroacetate or the mixture of the chloroactic acid and the sodium chloroacetate at a controlled temperature of 50-95 DEG C and a pH value of 7-10 for three to ten hours to obtain the naphthenic acid imidazoline and the lycine of the amide thereof; the moll ratio of naphthenic base contained in the naphthenic acid imidazoline to the chloroactic acid or the sodium chloroacetate or the mixture of the chloroactic acid and the sodium chloroacetate is 1.0:4.1-13.0. The obtained product is applied in the HCl-H2S-H2O system as a water soluble corrosion inhibitor. The preparation method of the invention is characterized by comparatively low cost, simple and convenient preparation and short reaction time. The naphthenic acid imidazoline and the lycine of the amide thereof as the water soluble corrosion inhibitor have excellent corrosion inhibition performance and good intermiscibility with organic amine, thereby being beneficial for industrial application.

Description

technical field [0001] The present invention relates to the preparation method of the betaine of naphthenic acid imidazoline and its amide and their in HCl-H 2 S-H 2 Application in the O system. 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 ...

Claims

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Application Information

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IPC IPC(8): C07D233/48C07C233/62C23F11/04
Inventor 石顺存蒋华鹏唐胜利苏界殊
Owner HUNAN UNIV OF SCI & TECH
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