Process and device for recovering and treating wastewater generated by preparing sebacic acid with castor oil

Abstract

The invention relates to a process and a device for recovering and treating wastewater generated by preparing sebacic acid with castor oil. The process comprises the steps of a, adjusting the pH value, b, purifying a fatty acid, c, carrying out evaporative crystallization, d, carrying out solid-liquid separation of anhydrous sodium sulfate, e, purifying secondary steam by removing phenol, f, compressing the secondary steam, and g, repeating the steps c-f, and collecting a sodium phenate solution, condensate water and the separated solid obtained in the step d. The invention also relates to a device for recovering and treating wastewater generated by preparing sebacic acid with castor oil; the device comprises a pH regulating reservoir, a fatty acid purifier, a waste material delivery pump, a mechanical steam recompression / evaporative crystallization system, a dryer and the like. The recovery process is simple to operate and low in cost, and also capable of realizing zero emission of contaminants, and environment-friendly and energy-saving, and in the meantime, the recovery device is simple and easy to operate.

Description

[0001] technical field [0002] The invention relates to a waste water recovery process and device, in particular to a waste water recovery process and device for producing sebacic acid from castor oil. Background technique [0003] Castor oil is used as raw material to produce sebacic acid through hydrolysis, alkali thermal cracking with phenol as a catalyst, neutralization, decolorization, acidification, etc. During the production process, a large amount of waste water will be generated, and every ton of sebacic acid will produce about 30 tons of wastewater and the wastewater has the following characteristics: sodium sulfate 30-350g / L, phenol 100-5000mg / L, fatty acid impurities 50--25000 mg / L, COD5000--15000mg / L, pH value 2-5. This wastewater contains phenol and high concentration of sodium sulfate, which are toxic and harmful to human body and environment, and is extremely difficult to treat. If discharged directly, it will cause serious damage to the environment. If ph...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems that the waste water recovery and treatment method produced by the production of sebacic acid from castor oil is too high in cost and will bring in new impurities, the present invention provides a recovery treatment with low energy consumption, high purity of recovered products and simple operation technology, the present invention also provides a kind of castor oil preparation sebacic acid generation waste water recovery treatment device simultaneously

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