Method and equipment for continuously refining liquid paraffin by virtue of by-product hydrochloric acid during chlorinated paraffin production

Abstract

The invention belongs to the technical field of fine chemistry, and relates to a method and equipment for refining raw material liquid paraffin and by-product hydrochloric acid simultaneously during a continuous production process for chlorinated paraffin, wherein the equipment is an extraction tower. The method comprises the following steps of: continuously and manually extracting the by-product hydrochloric acid and the raw material liquid paraffin generated during the continuous production process for chlorinated paraffin, so as to improve the purity of the liquid paraffin entering in a chlorination reaction phase; and reacting the raw material liquid paraffin with free chlorine in the hydrochloric acid, so as to reduce the concentration of the free chlorine in the by-product hydrochloric acid. According to the method and the equipment disclosed by the invention, via the mutual extraction and reaction of the by-product hydrochloric acid and the raw material liquid paraffin, the contents of aromatic hydrocarbon, basic nitrogen, mechanical impurities and water in the liquid paraffin are reduced, the purity of the raw material liquid paraffin is improved, and then the colour of the chlorinated paraffin product is improved, and the colour numbers of platinum and cobalt are reduced to be less than 100; simultaneously, the raw material liquid paraffin can be reacted with the free chlorine in the by-product hydrochloric acid, so that the quality of the by-product hydrochloric acid is improved, and the content of the free chlorine in the by-product hydrochloric acid is reduced to 0.006 from about 0.015 originally after extraction.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and relates to a method and equipment for simultaneously refining raw material liquid wax and by-product hydrochloric acid in a continuous chlorinated paraffin production process, and the equipment is an extraction tower. Background technique [0002] In recent years, with the expansion of the use of chlorinated paraffins, the domestic production scale of chlorinated paraffins has continued to expand. Nitrogen and water), the color cannot reach the level of imported raw material liquid wax, the general platinum cobalt color number is around 100-120, and the platinum cobalt color number of the superior product in the HG2092-1991 standard should not be greater than 100, use imported liquid wax Wax production can control the color of chlorinated paraffin products within platinum cobalt color No. 80. In addition, because chlorine gas cannot fully react with liquid wax during the production pro...

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Problems solved by technology

[0002] In recent years, with the expansion of the use of chlorinated paraffins, the domestic production scale of chlorinated paraffins has continued to expand. Nitrogen and water), the color cannot reach the level of imported raw material liquid wax, the general platinum cobalt color number is around 100-120, and the platinum cobalt color number of the superior product in the HG2092-1991 standard should not be greater than 100, use imported liquid wax Wax production can control the color of chlorinated paraffin products within platinum cobalt color No. 80. In addition, because chlorine gas cannot fully react with liquid wax during the production process of chlorinated paraffin wax, a small amount of hydrogen chloride tail gas is entrained in the reaction process. Chlorine gas enters the acid system, resulting in more free chlorine in the hydrochloric acid by-product of chlorinated paraffin, which limits the use of hydrochloric acid

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