Method for extracting m-phthalic acid-5-sodium sulfonate from ternary-monomer industrial waste water

Abstract

Provided is a method for extracting m-phthalic acid-5-sodium sulfonate from ternary-monomer industrial waste water. A sediment crystallization tank (A), a pressure filter (B), an ester decomposition tank (C), a high-pressure pump (D), a distillation tower (E), a decoloration and impurity absorption kettle (F), a filter (G), a concentration and crystallization kettle (H), a centrifugal hydroextractor (I), a flash melting kettle (J), a fine filter (K), a secondary concentration and crystallization kettle (L), a rubber lining water extractor (M) and a drying machine (N) are connected to be a production line, the ternary-monomer industrial waste water serves as the main raw material, an organic precipitant (2), sodium hydroxide (6), activated carbon (9), deionized water (16), sulfuric acid (17) and activated carbon (9) are sequentially added in related devices according to process requirements through the process procedures of various processes, and finished m-phthalic acid-5-sodium sulfonate (24) is prepared under the specific temperature, time and process conditions of the process procedures of various processes. The method can further extract out sodium sulfate crystals (4) in the waste water. Pollution is reduced, environment is protected, waste is turned into wealth, and double purposes are achieved.

Description

technical field [0001] The invention relates to a production process of chemical products, in particular to a method for extracting corresponding useful substances from waste liquid in the production process of chemical products. Background technique [0002] Trimonomer is a popular name for dimethyl isophthalate-5-sodium sulfonate, which can be used as an additive for polyester chips. Since the wastewater generated in the production process will pollute the soil and the environment, it must be treated. At the same time, the wastewater contains 3 to 5% of dimethyl isophthalate-5-sulfonic acid sodium and disodium salt and trisodium salt of dimethyl isophthalate-5-sulfonic acid, and also contains 5 to 7% If useful chemical components such as sodium sulfate can be extracted, it will kill two birds with one stone, which can not only create useful value, but also control wastewater pollution. At present, the resin adsorption method is mainly used to extract sodium m-phthalate-5...

AI Technical Summary

Problems solved by technology

At present, the resin adsorption method is mainly used to extract sodium m-phthalate-5-sulfonate, which requires large equipment investment and high cost, making it difficult to realize industrial production

Due to the high cost of completely recovering organic components and inorganic salts, after the residual methanol is extracted by distillation, the general enterprise will directly discharge the production wastewater, which will pollute the environment

The applicant's invention patent "a method for comprehensive treatment of waste water produced by three monomers" (patent number: ZL201110378414.4) adopts extraction technology, and the treatment cost is low, but the content of sulfuric acid in the raffinate is 5-7% Sodium cannot be effectively extracted

Every time a domestic enterprise produces 1 ton of dimethyl isophthalate-5-sodium sulfonate, it needs to discharge 4 tons of production wastewater; if it produces 3,000 tons of products per year, it will discharge 12,000 tons of production wastewater, which will not only pollute the land and the environment, but also cause a large amount of waste water. The remaining useful components are lost, causing economic losses

Images