Treatment method for high concentration organic waste liquid in sucralose production

Abstract

The invention discloses a treatment method for high concentration organic waste liquid in sucralose production. The method includes: firstly conducting distillation concentration under reduced pressure on high concentration organic waste liquid twice, separating a solvent, water and a light component, and removing an inorganic salt from the solution, then adding strong base for backflow, then conducting reduced pressure distillation to separate the organic small molecule structure light component obtained by alkali degradation, finally adding a polymeric flocculant for flocculation precipitation of the remaining small quantity of macromolecular organic matter, performing concentration and conducting treatment with a strong oxidant, degrading the macromolecular organic matter into small molecule organic matters, and then conducting deep treatment in a biochemical pool. The method provided by the invention completely realizes degradation of high concentration organic waste liquid, enhances the economic benefits, can practically and effectively meet the environmental protection demands, also lowers the wastewater treatment cost, and provides a new way for the high concentration organic waste liquid produced in the industrial production process of sucralose.

Description

technical field [0001] The invention relates to the technical field of chemical production waste treatment, in particular to a treatment method for high-concentration organic waste liquid in sucralose production. Background technique [0002] The wastewater produced in the sucralose production process is a high-concentration organic chemical wastewater with complex water components, high concentration, and poor biodegradability, making it difficult to treat. Wastewater contains N,N-dimethylformamide, sucralose-6-acetate, dimethylammonium salt, sulfate, chloride salt, and chlorinated by-products (monochlorine, dichlorosucrose produced during chlorination of sucralose) Chlorine, tetrachloride, etc.), sucrose carbide and other refractory substances have a strong inhibitory effect on biochemically treated microorganisms. If the wastewater treatment is not up to standard, it will not only seriously hinder the development of the sucralose industry, but also bring harm to the ecol...

AI Technical Summary

Problems solved by technology

[0002] The wastewater produced in the sucralose production process is a high-concentration organic chemical wastewater with complex water components, high concentration, and poor biodegradability, making it difficult to treat

In this treatment process, the amount of waste liquid separated by single-stage concentration is large, and the reagents required for the treatment are various, and the energy consumption of the treatment process is large; at the same time, the post-treatment cost of the single-stage concentration process is high.

In addition, as the main treatment method for high-concentration organic matter, incineration treatment has limitations in the treatment of high-concentration organic waste liquid after ethyl acetate extraction in the sucralose production process, which is prone to secondary pollution

The reasons are as follows: firstly, the combustion value of organic matter in high-concentration organic waste liquid is low, which can only be completed by assisting combustion with methanol, gasoline and other combustion aids, which increases the cost of incineration and easily produces incompletely combusted waste residue; secondly, the waste liquid contains A large number of inorganic salts and organic solvents remain, and the incineration process produces a large amount of smoke and toxic and harmful gases, forming secondary pollution waste gas

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