Method for producing chlorinated fatty acid methyl ester by resource utilization of byproduct hydrochloric acid

The technology of chlorinated fatty acid methyl ester and fatty acid methyl ester is applied in the field of resource utilization of by-product hydrochloric acid to prepare environmental plasticizers, and can solve the problems of various impurities in by-product hydrochloric acid and by-product hydrochloric acid, catalysts easily affected by impurities, and additional downstream products. It can reduce the purification process of hydrochloric acid, achieve high product quality stability and low cost.

Active Publication Date: 2020-11-27
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive utilization method of the above-mentioned by-product hydrochloric acid is difficult to be used for reference in the production of chlorinated fatty acid methyl esters
Affected by chlorinated fatty acid methyl ester by-product hydrochloric acid and impurity content (HCl content is 5-36%, fatty acid methyl ester content is 0.01-0.03%, fatty acid content is 0.001-0.05%), the catalyst of HCl oxidation unit is easily affected by impurities, It is easy to cause catalyst poisoning; in addition, the reaction of concentrated hydrochloric acid and manganese dioxide to produce chlorine also has economic problems
[0005] Through the above analysis, we found that the reasons that really restrict the comprehensive utilization of by-product hydrochloric acid mainly come from factors such as the variety of impurities in by-product hydrochloric acid, the high cost of purification and reuse, and the low added value of downstream products.

Method used

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  • Method for producing chlorinated fatty acid methyl ester by resource utilization of byproduct hydrochloric acid
  • Method for producing chlorinated fatty acid methyl ester by resource utilization of byproduct hydrochloric acid

Examples

Experimental program
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Embodiment 1

[0030] In this embodiment, chlorine gas is produced by electrolytic by-product hydrochloric acid, and chlorine gas and fatty acid methyl ester are reacted in the tower to obtain chlorinated fatty acid methyl ester, see figure 1 . Its processing steps and specific conditions are as follows:

[0031] Hydrochloric acid by-products: HCl content 30%, phosphoric acid content 2.5%, methanol content 4.7%, chloroacetic acid content 1.6%, monochloromethane content 0.15%, dimethyl phosphite content 0.12%, silicic acid content The content of dimethyldichlorosilane hydrolyzate (D3, D4) is 0.01%, the content of ferric chloride is 0.35%, and the content of potassium sulfate is 0.005%.

[0032] 1) Add the above hydrochloric acid by-products into the electrolytic cell, adjust the voltage of the electrolytic cell to 2.7V, and send the generated mixed gas (mainly 90% of chlorine gas, about 10% of HCl and water vapor) to the condenser to condense to 5°C (exist figure 1 Omit in), remove the moi...

Embodiment 2

[0039] In this embodiment, chlorine gas is produced by the electrolysis of hydrochloric acid by-product in Example 1, and by optimizing the electrolysis voltage parameters, the temperature of the electrolytic cell and the concentration of hydrochloric acid fed into the electrolytic cell, the output of chlorine gas is adjusted and the power consumption per unit mass of chlorine gas is reduced. The process steps and specific conditions are as follows: 1) Adjust the electrolysis voltage to 2.3V, reduce the concentration of by-product hydrochloric acid to 20%, and adjust the temperature in the electrolytic cell to 60°C.

[0040] 2) chlorination tower mode of operation and parameter are with embodiment 1; Fatty acid methyl ester flow is 270kg / h, and chlorine flow is 177kg / h.

[0041] 3) Other operations and parameters are the same as in Example 1. The absorption tower obtains concentrated hydrochloric acid (20%) as a by-product, and then sends it to the electrolysis device to gener...

Embodiment 3

[0045] In actual production, affected by seasons and downstream applications, the supply of caustic soda produced by chlor-alkali plants is often in short supply. On the contrary, there will be a large surplus of chlorine gas, resulting in slow sales. The process of the present invention can not only utilize the excess chlorine gas of the chlor-alkali plant, but also use the chlorine gas produced by the electrolysis of its by-product hydrochloric acid together to alleviate the problem of excess chlorine gas.

[0046] In this embodiment, the chlorine gas produced by the by-product of electrolysis hydrochloric acid and the chlorine gas in the chlor-alkali plant are used as raw materials to realize the reuse of the by-product hydrochloric acid and alleviate the problem of excess chlorine in the chlor-alkali plant. Its processing steps and specific conditions are as follows:

[0047] 1) Adjust the electrolysis voltage to 2.1V, reduce the concentration of by-product hydrochloric ac...

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Abstract

The invention provides a method for producing chlorinated fatty acid methyl ester from hydrochloric acid by-products, which is characterized in that a hydrochloric acid by-product pipeline is connected with an electrolytic bath, the upper part of the electrolytic bath is connected with a chlorination tower; the upper part of the chlorination tower is connected with an absorption tower, the lower part of the chlorination tower is connected with a devolatilization tower; and the devolatilization tower is connected to a chlorinated fatty acid methyl ester storage tank. The method comprises the following steps: mixing a hydrochloric acid by-product with a chlorinated fatty acid methyl ester by-product hydrochloric acid, introducing the mixture into a hydrochloric acid electrolytic cell, carrying hydrogen chloride and water vapor in escaped chlorine, and condensing the mixed gas; pumping fatty acid methyl ester from the top of the chlorination tower, introducing condensed mixed gas from thebottom of the chlorination tower, and reacting at the tower temperature of 50-120 DEG C; introducing the chlorinated fatty acid methyl ester obtained by reaction into a devolatilization tower, and removing residual gas in the chlorinated fatty acid methyl ester under the vacuum condition of 5-20KPa and at the temperature of 50-120 DEG C to obtain the chlorinated fatty acid methyl ester. Accordingto the technical scheme, the problem that the byproduct hydrochloric acid is unsalable is solved, and restricting factors of chlorine and the byproduct hydrochloric acid in the production of the chlorinated fatty acid methyl ester are eliminated.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for resource utilization of by-product hydrochloric acid to prepare an environment-friendly plasticizer. Background technique [0002] In industries such as compound fertilizer, chloroacetic acid, phosphorus trichloride, chlor-alkali, fumed silica, and organic silicon, the problem of slow sales of by-product hydrochloric acid is very serious. According to incomplete statistics, my country's annual by-product hydrochloric acid reaches 20 million tons. Due to the concentration, region and season restrictions, a large amount of by-product hydrochloric acid is often sold in reverse, and sometimes it is unsalable. The digestion and utilization of a large amount of by-product hydrochloric acid has become a common problem restricting the development of many industries such as chlorinated polyethylene, methanesulfonic acid, compound fertilizer, chlor-alkali, polyuretha...

Claims

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Application Information

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IPC IPC(8): C07C67/307C07C69/62C07C69/003C25B1/26
CPCC07C67/307C25B1/26C07C69/62C07C69/003
Inventor 周昌林弭希海汪磊李德江刘杨李永双黄绪泉方艳芬谈云志
Owner CHINA THREE GORGES UNIV
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