Chloroacetic acid crystallization technology

Abstract

The invention discloses a chloroacetic acid crystallization technology. According to the chloroacetic acid crystallization technology, chloroacetic acid crystallization process is controlled via monitoring the material temperature of chloroacetic acid materials in a crystallization kettle, and controlling water temperature of cooling water in the crystallization kettle based on the material temperature. The chloroacetic acid crystallization technology is divided into nine phases strictly including eight cooling phases of chloroacetic acid materials, and one heating phase, and the heating phase is arranged between two cooling phases. The chloroacetic acid crystallization technology is capable of avoiding hanging of crystals on walls fundamentally, can be used for realizing refine controlling of crystallization process of chloroacetic acid materials, avoiding human factor influences such as judgment error introduced by empirical operation, shortening crystallization time, and increasing product quality and yield. Full automatic operation of the chloroacetic acid crystallization technology can be realized easily because of refine controlling of crystallization process, so that labor intensity is reduced, on-site safety factor is increased, production energy consumption is reduced, and production efficiency is increased greatly.

Description

Technical field [0001] The invention relates to the technical field of chloroacetic acid production, in particular to a chloroacetic acid crystallization process. Background technique [0002] At present, the crystallization of chloroacetic acid in the production of chloroacetic acid is the key to product quality, production efficiency and production energy consumption. Although there are a large number of research reports on chloroacetic acid crystallization, most of them are methods to optimize the crystallization process through the improvement of crystallization equipment However, in actual production, the control of the crystallization process of each production enterprise often guides the crystallization operation based on the cooling control theory summarized by manual experience, which often results in (1) long crystallization cycle and low equipment utilization; (2) extremely easy to form The wall hanging problem caused by the partial crystallization of the material liqu...

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Problems solved by technology

[0002] At present, the crystallization of chloroacetic acid in the production of chloroacetic acid is the key to affecting product quality, production efficiency and production energy consumption. Although there are a large number of research reports on the crystallization of chloroacetic acid, most of them belong to the method of optimizing the crystallization process through the improvement of crystallization equipment , and in actual production, the control of the crystallization process by each production enterprise is often based on the cooling control theory summarized by manual experience to guide the crystallization operation, which often results in (1) long crystallization cycle and low equipment utilization rate; (2) extremely easy to form The wall-hanging problem caused by the partial crystallization of the feed liquid attached to the tank wall not only affects the heat exchange of the equipment, but also causes the feed liquid to turn red due to repeated temperature rises in the process of eliminating the wall-hanging problem; (3) The cooling crystallization process requires workers to constantly observe the material The liquid color, viscosity, etc., to adjust the cooling water flow in time, human factors have a great impact on the production results, resulting in high production instability and other problems, restricting the development of chloroacetic acid production