Continuous production device and process for chlorinated fatty acid methyl ester

Abstract

The invention relates to a continuous production device for chlorinated fatty acid methyl ester. The device comprises a raw material storage tank (1) for storing fatty acid methyl ester, a primary reaction tower (3) internally provided with a catalyst and mainly used for carrying out addition reaction on fatty acid methyl ester and hydrogen chloride, a secondary reaction tower (4) mainly used forsubstitution reaction of chlorinated fatty acid methyl ester and chlorine, and a degassing tower (5) capable of blowing off materials through compressed air to enable gas to escape to obtain the required chlorinated fatty acid methyl ester, wherein a second gas outlet (42) of the secondary reaction tower (4) is communicated with a first gas inlet (31) of the primary reaction tower (3). The invention also relates to a continuous production process for chlorinated fatty acid methyl ester, which applies the continuous production device. Compared with the prior art, the continuous production device and process for chlorinated fatty acid methyl ester have the advantages that the reaction degree can be improved, tail gas emission is reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of chlorinated fatty acid methyl ester production, in particular to a continuous production device and process for chlorinated fatty acid methyl ester. Background technique [0002] Biodiesel includes fatty acid methyl esters and fatty acid ethyl esters produced by the reaction of animal and vegetable oils, waste oils and other esters with alcohols. As a green energy source supported by national policies in recent years, it has the characteristics of wide sources, renewable, and high environmental friendliness. . [0003] Plasticizer is one of the polymer additives, which can improve plasticity and lower the glass transition temperature of polymers. Since PVC plastic is easy to decompose, plasticizers must be added in the production process to reduce the temperature required for processing. Plasticizers are also one of the main application fields of PVC additives. Dioctyl phthalate (DOP) plasticizers are o...

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Problems solved by technology

[0005] The first is intermittent: as the patent application number is CN201310110575.4 (announcement number is CN103193637A) invention patent "a kind of preparation method of bio-ester plasticizer" discloses a kind of preparation method of bio-ester plasticizer, its By changing the reaction conditions, the addition reaction and then the substitution reaction can be carried out in the same reactor, but the production efficiency of batch operation is low, the quality of different batches of products fluctuates greatly, and due to the use of organic peroxides as the reaction Initiator, which will lead to impurities in the product; the invention patent "Using Biodiesel to Produce Chlorinated Fatty Acid Methyl Esters" with the patent application number CN201910612401.5 (the announcement number is CN110317135A) discloses a method of using biodiesel to produce chlorinated fatty acid methyl esters. Ester process, which uses nitrogen to replace the air in the system before the reaction starts, and uses nitrogen to degas the product, and also uses ultraviolet photocatalysis to avoid the problem of organic initiators introducing impurities into the product and improve the quality of the product , but it is still produced intermittently, and the reaction conditions have not been adjusted according to the reaction stage. There may be a problem that the reaction temperature is too high and the color of the product increases

[0006] The second is a continuous type: as the patent application number is CN201210165994.3 (announcement number is CN102671593A) invention patent "chlorinated fatty acid methyl ester continuous production device" discloses a kind of chlorinated fatty acid methyl ester continuous production device, which by setting The way of two reaction towers with different reaction conditions enables the two stages of the reaction to be carried out separately, which improves the degree of reaction and realizes the continuous production of the reaction. However, it is not equipped with a degassing device, which will cause hydrogen chloride to still be dissolved in the product. Thereby make product acid value and chromaticity raise; Patent application number is CN201220239682.8 (announcement number is CN202606143U) utility model patent " chlorinated fatty acid methyl ester continuous production device " discloses chlorinated fatty acid methyl ester continuous production device, its The reaction device is divided into three stages: absorption pretreatment, addition with chlorine gas, and replacement with chlorine gas, so that the reaction stages of chlorinated fatty acid methyl esters are carried out in different reaction towers, which facilitates a more thorough reaction and avoids damage caused by long-term high temperature of the material. The carbonization of chlorinated fatty acid methyl esters has the problem of deep color, but this process inevitably introduces unstable chlorine atoms such as adjacent arrangement of carbon chain chlorine atoms and chain terminal chlorine atoms during the addition reaction stage of fatty acid methyl esters and chlorine gas. structure, which is not conducive to the stability and quality maintenance of chlorinated fatty acid methyl ester products

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