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Comprehensive utilization method of phenolic resin wastewater

A phenolic resin and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as inability to realize zero discharge of waste water, unfavorable popularization and use, and complicated process , to achieve the effects of simple operation and easy control, saving manpower and power, and short production process

Inactive Publication Date: 2012-06-20
河北泽田化工有限公司
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Problems solved by technology

This method has the defects of relatively complicated process and cumbersome operation, which is not conducive to popularization and use.
[0005] None of the above phenolic resin wastewater treatments can achieve zero discharge of wastewater

Method used

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  • Comprehensive utilization method of phenolic resin wastewater
  • Comprehensive utilization method of phenolic resin wastewater

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Experimental program
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Effect test

Embodiment

[0025] (1) Polycondensation treatment:

[0026] A. The 10000kg process wastewater produced by the production of phenolic resin is injected into the polycondensation reactor 1 and stirred;

[0027] B. According to the free phenol content in the inspection and analysis waste water, calculate the amount of formaldehyde added by formula formaldehyde quality=waste water quality×waste water phenol content%×0.256÷formaldehyde content, the free phenol content is 5%, and the formaldehyde addition is 346kg;

[0028] C. Pour 346kg of formaldehyde into the polycondensation reactor 1, and at the same time add an acidic catalyst composed of industrial grade hydrochloric acid to adjust its pH to 1-2, turn on the steam to raise the temperature to 100°C to boil and reflux, keep the temperature for 5 hours, and then cool down to 55°C, put the material in the polycondensation reactor into the settling separation tank 2 to settle and cool for 10 hours to obtain 1600kg of precipitated small molecu...

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Abstract

The invention discloses a comprehensive utilization method of phenolic resin wastewater, belonging to the technical field of processing wastewater produced in the fine chemical engineering industry. The comprehensive utilization method comprises the steps of: adding the phenolic resin wastewater, an acid catalyst and formaldehyde in a condensation polymerization kettle according to the proportion, raising the temperature until the phenolic resin wastewater, the acid catalyst and the formaldehyde are boiled, preserving temperature for reaction; then reducing the temperature in the kettle, pumping materials in the condensation polymerization kettle into a settlement separation kettle by using a pump to reduce the temperature and settle and demix; flowing a lower layer resin material of a settlement formed by demixing into a resin synthesis kettle through a pipeline, adding the acid catalyst and the formaldehyde, raising temperature and boiling for reaction, vacuum dewatering to obtain thermoplastic phenolic resin; and injecting one part of wastewater with content of the free phenol formed after the settlement formed in the condensation polymerization kettle, which is reduced to be below 1 percent, into a water borne resin synthesis kettle to be used for reducing water soluble resin, absorbing the formaldehyde in a primary and a secondary absorption towers one part of which is injected with industrial formaldehyde, and forming the industrial formaldehyde. The invention realizes the purpose that the phenolic resin industrial wastewater achieves zero emission.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment produced in fine chemical industry, and specifically relates to the comprehensive utilization of wastewater produced in the production process of phenolic resin. Background technique [0002] Formaldehyde and phenol are highly toxic chemical substances. The human body will have acute poisoning symptoms if they ingest a small amount of formaldehyde or phenol. big threat. [0003] At present, in the synthesis and dehydration process of phenolic resin, the waste water produced has a high content of formaldehyde and phenol, which is extremely difficult to deal with, and it is difficult to meet the discharge standard. The methods for processing the above-mentioned formaldehyde and phenol wastewater include extraction method, oxidation-adjusting pH value-flocculation-adsorption method, SnO 2 Electrode electrolytic catalysis, natural mineral adsorption-sunlight photolysis, emulsion liquid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/78C08G8/08C07C47/058C02F9/04C08G14/08
Inventor 焦文霞刘惠长王振廷
Owner 河北泽田化工有限公司
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