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Method for processing production waste water of propylene oxide

A technology for producing waste water and propylene oxide, applied in the field of calcium chloride treatment and reuse, can solve the problems of limited use, high cost and high cost, and achieve the effect of large economic benefits

Inactive Publication Date: 2009-01-07
LIAONING DAZE ENVIRONMENT ENG
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Problems solved by technology

However, due to the high cost of wastewater treatment and no economic benefits, it has not been promoted.
[0004] In foreign countries, membrane treatment is used to treat waste water containing calcium chloride from the production of propylene oxide, but due to the high cost, the use is also limited
In short, there is currently no mature and reliable treatment method for the production wastewater of propylene oxide in the world

Method used

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  • Method for processing production waste water of propylene oxide

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Embodiment Construction

[0015] The concentration of calcium chloride in the waste water corresponding to propylene oxide products is about 3%, and ammonium bicarbonate with a concentration of 3-10% is used to generate nano-scale light calcium carbonate without grinding or grading; and the particle size of the product is uniform, which can be Satisfy the requirements of nano premium products.

[0016] Calcium bicarbonate can undergo a thermal decomposition reaction at a temperature of 60°C to 100°C; but the thermal decomposition effect is better at a temperature of 80°C to 100°C.

[0017] After the solid-liquid separation of the reaction liquid, a clear ammonium chloride solution with a concentration of 2 to 3% can be obtained, and a concentrated ammonium chloride solution with a concentration of more than 20% can be obtained through membrane separation and concentration; at the same time, industrial Purified water; ammonium chloride solution is further evaporated and crystallized to obtain crystallin...

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Abstract

A method for processing industrial wastewater of epoxy propane relates to a processing method of wastewater produced by epoxy propane, in particular to the treatment and the re-utilization of calcium chloride in wastewater. The invention provides a method for processing the industrial wastewater of the epoxy propane, which is used for processing and better utilizing the calcium oxide in the industrial waste water of the epoxy propane. The method comprises the following steps: firstly, generating calcium bicarbonate and calcium chloride by utilizing the reaction of ammonium bicarbonate and ammonium chloride; secondly, generating calcium carbonate precipitate, water and carbon dioxide through thermally decomposing the calcium bicarbonate; and thirdly, generating the calcium carbonate precipitate and the water by utilizing the reaction of calcium hydroxide in the wastewater and CO2 generated by thermally decomposing the calcium bicarbonate.

Description

Technical field: [0001] The invention relates to a treatment method for propylene oxide production wastewater, in particular to the treatment and reuse of calcium chloride in the wastewater. Background technique: [0002] At present, propylene oxide production enterprises at home and abroad usually use the chlorohydrin process. The wastewater containing calcium chloride produced during the production process is extremely difficult to treat industrial wastewater, which not only corrodes equipment, but also seriously pollutes the environment. [0003] The relatively advanced enterprise in China that treats the production wastewater of propylene oxide is "Shandong Da Chemical Co., Ltd.", and its waste treatment principle is multi-effect evaporation, which concentrates the wastewater to a concentration of about 65-70%, and processes it into finished products for sale, resulting in The condensed water is returned to the production workshop for reuse. However, due to the high cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/18C01C1/16C02F1/44C02F103/36
Inventor 张松岚刘玉成
Owner LIAONING DAZE ENVIRONMENT ENG
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