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Process for treating saponification wastewater by chlorohydrination

A technology of wastewater treatment and treatment method, applied in the field of chemical treatment, can solve the problems of easy local crystallization, pipeline blockage, crystallization scaling, etc., to achieve good social and economic benefits, and the effect of increasing concentration

Active Publication Date: 2009-07-15
HANGZHOU WATER TREATMENT TECH DEV CENT
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Problems solved by technology

[0012]6) Easy to crystallize and scale. Although the concentration of salt is far from the concentration of crystallized scale, crystallized scale is prone to occur in the channels and pipelines through which wastewater flows phenomenon, clogging the pipe
[0015]Propylene oxide industrial wastewater has complex components and large discharge volume, which has brought great pollution to the environment. Due to its high temperature, high salt, high COD, Easy local crystallization and other problems have caused great difficulties to the treatment of wastewater

Method used

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  • Process for treating saponification wastewater by chlorohydrination

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Embodiment 1

[0044] Design, install and debug each treatment device of the whole process with a treatment capacity of 2 tons per hour, and finally conduct a field test on the saponification wastewater of a propylene oxide plant:

[0045] It has been determined that the discharge of saponification wastewater is about 10,000 tons / day, the pH of saponification wastewater is 11.8, the salt content is 2.9%wt, COD Cr 1800mg / L, suspended solids SS 2800mg / L, water temperature 81°C; follow the steps below:

[0046] 1. The saponification wastewater is pumped into the thickening tank 2 through the sludge pump to recover the gray milk. The SS value of the supernatant is determined to be 850mg / L, and the supernatant enters the turbine type air flotation sedimentation combined tank 3 to remove some small particles Suspended matter and large particle suspended matter, the settling time is 1.5 hours, and the sediment is pressed into a filter cake with a filter press and shipped out. After air flotation an...

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Abstract

The invention discloses a chemical processing method, and in particular discloses a method for recovering and reusing saponified waste water generated by a chlorohydrination method. The invention uses the novel film method and the salt and water recovering and reusing method to process the saponified waste water generated by a chlorohydrination method, and the technical designs, such as gas flotation, crystallizing prevention, ceramic film filtration, heat exchange, electrodialysis concentration, vaporizing recovery and the like are applied in the method. The invention has the advantages that the zero discharge of the waste water is basically realized, the salt and the water can be recovered, the small land area is occupied, the running expense is low, and the economic and social benefits are high. The invention can be widely used in the factories using the chlorohydrination method for producing propylene oxide.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a treatment method for recycling saponification wastewater produced by chlorohydrinization. Background technique [0002] Through technical novelty research, the current domestic methods of treating this type of wastewater mainly include direct discharge to urban sewage treatment plants for unified treatment, biological methods and physical, physical and chemical combination processes, etc. [0003] The production of propylene oxide is mainly divided into two steps. The first step is chloroalcoholization, which requires a large amount of fresh water; the second step is saponification reaction. The saponification wastewater of chlorohydrinization method mainly comes from the saponification reaction process. A large amount of sewage discharged from the saponification process in the process of producing epoxides by the chlorohydrin method, due to the high salt concentration (CaCl 2 Th...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/52C02F1/24C02F1/469C02F1/66C02F1/04C01F11/24C02F103/36
Inventor 金可勇周勇高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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