High-temperature propylene chlorination process epichlorohydrin production waste water integrated treatment process

Abstract

The invention discloses a high-temperature propylene chlorination process epichlorohydrin production waste water integrated treatment process, which belongs to the technical field of environmental protection. Each high-temperature propylene chlorination process production enterprise is equipped with an electrolytic edible saline solution section, a majority of enterprises adopt the edible saline solution by exploiting underground brine, the brine contains a certain amount of Na2SO4 which influences the electrolysis of the edible saline solution, so that the Na2SO4 needs to be separated beforeelectrolysis of the edible saline solution. A great amount of CaCl2 is generated in a cyclization phase of the high-temperature propylene chlorination process for producing the epichlorohydrin and enters waste water, and the treated CaCl2-containing waste water cannot be directly discharged. According to the above situation, Na2SO4 is adopted to react with CaCl2 to generate CaSO4, i.e., gypsum, and after the separation, the gypsum can be used as an auxiliary material of a cement factory; and after the reaction, the waste water containing a great amount of NaCl and COD enters an MCOP (modifiedcontact oxidation process) system to perform the biochemical reaction, the water produced in the reaction is oxidized at a high level to further remove COD, so that the COD of the discharged water isless than or equal to 60 mg / L, the waste water containing a great amount of NaCl can be used as a dilute saline solution for exploiting saline brine. By adopting the process, not only is the problem that the utilization rate of the Na2SO4 is low solved, but also the pollution emission problem of the CaCl2 can be solved, a purpose of treating the waste by using waste can be achieved, and the industrial policy of the national resource comprehensive utilization can be satisfied.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an integrated treatment process for producing epichlorohydrin wastewater by a high-temperature propylene chlorination method. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and fine chemical product. It is a large variety of propylene derivatives. It is mainly used in the synthesis of glycerin, epoxy resin, epichlorohydrin rubber, nitroglycerin explosives, etc.; it can also be used It is used as a solvent for cellulose esters, resins and cellulose ethers; it is also the main raw material for the production of surfactants, plasticizers, stabilizers, adhesives and ion exchange resins. Epichlorohydrin wastewater mainly includes propylene washing alkali washing wastewater, propylene compression condensation separation wastewater, cyclization wastewater and low boiler separation wastewater, the main pollutant is Ca 2+ , Cl...

AI Technical Summary

Problems solved by technology

This process solves the Na 2 SO 4 The problem of low utilization rate is solved by CaCl 2 The problem of pollution discharge, to achieve the purpose of treating waste with waste, in line with the national industrial policy of comprehensive utilization of resources, at the same time, to achieve the degradation of organic matter by microorganisms under high-salt conditions

Images