Waste water treating method and multi-effect evaporator for propylene oxide production

A technology for the production of waste water and propylene oxide, which is applied in multiple-effect evaporation, heating water/sewage treatment, distillation in boilers/distillates, etc., can solve the problem of increased production costs in processing steps, high chemical oxygen consumption, and aggravated sewage Body pressure and other issues, to achieve the effect of short heating time, fast evaporation speed, and reduced toxicity

Inactive Publication Date: 2007-06-13
刘德沛
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Problems solved by technology

[0003] However, the above processing steps greatly increase the production cost, which is generally unaffordable for enterprises.
At the same time, the contradiction in wastewater treatment leads to high chemical oxygen consumption in wastewater, which increases the pressure of sewage and causes serious pollution of the surrounding environment. Therefore, the treatment of industrial wastewater generated in the production process of propylene oxide has always been the bottleneck of enterprise development.

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  • Waste water treating method and multi-effect evaporator for propylene oxide production
  • Waste water treating method and multi-effect evaporator for propylene oxide production

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Embodiment Construction

[0017] A kind of propylene oxide production wastewater treatment method of the present invention, the method comprises the following steps:

[0018] (1) First, the wastewater is subjected to multi-effect evaporation treatment to obtain a wastewater concentrate;

[0019] (2) Then, crystallize the wastewater concentrate to obtain calcium chloride crystals.

[0020] In the present invention, the multi-effect evaporator used in the above method is used for wastewater treatment, and the multi-effect evaporator is briefly introduced below.

[0021] Referring to Fig. 1, in one embodiment of the present invention, the multi-effect evaporator can be a five-effect evaporator, and the five-effect evaporator mainly includes five effects, a crystallization tank 9 and a series of pipelines.

[0022] Among them, an effect refers to a zone of a multi-effect evaporator that is heated by steam (generally water vapor) and also releases steam into a subsequent zone, where it is used to supply pa...

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Abstract

The method of treating waste water from propylene oxide production adopts multi-effect evaporator and includes the following steps: multi-effect evaporating waste water to obtain concentrated waste water; crystallizing concentrated waste water to obtain calcium chloride crystal; centrifugally separating the calcium chloride crystal from waste water; and finally condensing to recover waste water steam. The present invention also discloses the structure of the multi-effect evaporator.

Description

technical field [0001] The invention relates to a treatment method and device for industrial waste water, in particular to a treatment method for propylene oxide production waste water and a multi-effect evaporation device thereof. Background technique [0002] The waste water produced in the production process of propylene oxide is extremely difficult to treat due to the characteristics of high temperature, high alkalinity and high chemical oxygen consumption. Difficult to survive. At present, many domestic propylene oxide manufacturers are built along the coast of the river. The above-mentioned waste water discharged by them is generally diluted with fresh water to meet the needs of biochemical treatment before biochemical treatment. [0003] However, the above-mentioned processing steps greatly increase the production cost, which is generally unbearable for enterprises. At the same time, the contradiction in wastewater treatment leads to high chemical oxygen consumption...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04B01D3/02B01D1/26C01F11/24C01F11/32
CPCC01F11/24B01D1/26
Inventor 刘德沛
Owner 刘德沛
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