Recycling processing technology for high-salt wastewater during carboxymethyl cellulose production

Abstract

The invention discloses a recycling processing technology for high-salt wastewater during carboxymethyl cellulose production. The processing technology combines extraction and graded crystallization technologies. In the graded crystalization process, through multi-effect (or mechanical recompression) evaporation crystallization, crude salt is recovered from wastewater and condensate water is evaporated, the condensate water reaches the industrial reuse water standard, and refined salt is prepared from crude salt through washing; and then through cooling crystallization, sodium glycollate crystal is separated out, the crystallization mother liquid is used for a next crystallization process, so that closed cycle is realized. In the above graded crystallization process, ethoxyacetic acid is obtained by performing extraction separation on a concentrated liquid, and the viscosity is reduced. The method is simple in operation, low in cost and high in separation recovery rate. The whole processing technology employs closed cycle, has no pollutants, and is easy for industrialization. The technology helps to solve the high-salt wastewater processing problem in the carboxymethyl cellulose production process, also helps to realize the recycling processing purposes of turning harm into good and changing wastes into valuables, and has substantial economic, social and environment benefit.

Description

technical field [0001] The invention belongs to the technical field of high-salt wastewater treatment, and in particular relates to a treatment process for recycling useful components of high-salt refractory organic wastewater generated in the production process of carboxymethyl cellulose. Background technique [0002] Carboxymethylcellulose (CMC) is a thickener widely used in food and daily chemical products. The main raw materials of CMC are ethanol, chloroacetic acid and sodium hydroxide. Water enzyme method and melting enzyme method are mostly used for production. Although the specific processes are different, the reaction principle and reaction substances have not changed much. In the production process, a large amount of organic solvent ethanol is used. The ethanol solution does not participate in the reaction, but it needs to be distilled. Recycling and recycling, however, during the distillation recovery process, a large amount of high-salt organic wastewater will be...

AI Technical Summary

Problems solved by technology

Water enzyme method and melting enzyme method are mostly used for production. Although the specific processes are different, the reaction principle and reaction substances have not changed much. In the production process, a large amount of organic solvent ethanol is used. The ethanol solution does not participate in the reaction, but it needs to be distilled. Recycling and recycling, however, during the distillation recovery process, a large amount of high-salt organic wastewater will be produced

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