Mother liquor emergency production process for crystallizing in chloroactic acid industrial production

Abstract

The invention discloses a mother liquor emergency production process for crystallizing in the chloroactic acid industrial production; the process comprises the following steps of: in a crystallizing procedure in the chloroactic acid industrial production, adding water to a synthesized chloride solution; and stirring and cooling the water and the chloride solution for crystallizing so as to obtain a chloroactic acid crystal product. The mother liquor emergency production process for crystallizing in the chloroactic acid industrial production, disclosed by the invention, has the advantages as follows: the crystallizing procedure in the chloroactic acid industrial production process is finished by water instead of a mother liquor; the crystallizing is finished through controlling the adding quantity of the water and by using a corresponding technical condition and an operation method, so as to obtain a standard product; when the proper mother liquor is lacking, normal production can be simply and conveniently maintained in case of emergency; the process is simple and feasible; new impurities cannot be introduced; the purity of the chloroactic acid crystal product reaches more than 97.5%; meanwhile, a novel mother liquor meeting requirements can be used in the next crystallizing circulation without being replaced with the water.

Description

technical field [0001] The invention relates to an industrial production process of chloroacetic acid, in particular to an emergency production process adopted when there is no suitable mother liquid when mother liquor is used for crystallization during the industrial production process of chloroacetic acid. Background technique [0002] At present, the crystallization process in the domestic industrial production of chloroacetic acid is produced by adding the mother liquor to the synthesis mixture. In production, due to various reasons, the mother liquor used to add to the crystallization kettle may be polluted, for example, due to sudden corrosion of equipment, a large amount of iron ions are brought into the mother liquor, or the sulfur-based chloroacetic acid makes the mother liquor due to insufficient synthesis. entrained sulfur, etc. When the polluted mother liquor is used for crystallization production, the appearance of the product often turns yellow, or the product...

AI Technical Summary

Problems solved by technology

For the former, there is no good crystallization mother liquor for sale in the market, and the prevailing market is waste mother liquor, which contains many pollutants and does not meet the requirements. It needs to be purchased after communication among peers in the industry, and this kind of purchase often has many problems. Big difficulty, longer mother liquor procurement cycle will stop production and reduce factory productivity

For the latter, although this method of conventional mother liquor renewal is feasible, in the initial stage of renewal, unqualified products will inevitably be produced, and these products can only be sold as off-grade products at reduced prices, causing losses to industrial production

In addition, there will also be a problem that there is no mother liquor available when the new expansion plant project of chloroacetic acid is started.