Method of circulation utilizing phenol containing waste water in novolac epoxy preparing process

A novolak epoxy resin and waste water recycling technology, applied in the direction of heating water/sewage treatment, etc., can solve the problems of ineffective recycling of phenol and high cost of environmental protection treatment, so as to reduce the cost of environmental protection treatment, improve market competitiveness and reduce consumption Effect

Active Publication Date: 2007-03-14
NANTONG XINGCHEN SYNTHETIC MATERIAL
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  • Abstract
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AI Technical Summary

Problems solved by technology

In short, whether it is combustion or biochemical treatment, the cost of environmental protection treatment is very high, and the phenol contained in it cannot be effectively recycled

Method used

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  • Method of circulation utilizing phenol containing waste water in novolac epoxy preparing process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 900 grams of phenol, 320 grams of formaldehyde, and 900 grams of water into the condensation reaction kettle. Under the action of the phenolic condensation catalyst, the condensation reaction is carried out at 85-115°C for 2-4 hours. and phenol until the phenol and water are completely removed to obtain a phenolic resin, and the softening point of the obtained phenolic resin is 53°C. The distilled phenol wastewater, the phenol-water azeotrope before 80°C, which contains about 5% phenol, enters the reaction water storage tank after condensation, and the phenol-water azeotrope after 80°C condenses and enters the recovery phenol storage tank .

Embodiment 2

[0017] 850 grams of phenol, 320 grams of formaldehyde, 950 grams of phenol-water azeotrope before 80°C are added to the condensation reaction kettle, and under the action of the catalyst, the condensation reaction is carried out at 85-115°C for 2-4 hours. Distill under reduced pressure at 0.09MPa to dehydrate and phenol until the phenol and water are completely removed to obtain a phenolic resin. The softening point of the obtained phenolic resin is 54°C. The phenol-water azeotrope before 80°C condenses and enters the reaction water storage tank, and the phenol-water azeotrope after 80°C condenses and enters the recovery phenol storage tank.

Embodiment 3

[0019] 200 grams of phenol, 374 grams of formaldehyde, 1800 grams of phenol-water azeotrope after 80°C are added to the condensation reaction kettle, under the action of the catalyst, the condensation reaction is carried out at 85-115°C for 2-4 hours, and after neutralization, the vacuum degree -0.09 Dehydration and phenol were distilled under reduced pressure under MPa until the phenol and water were completely removed to obtain phenolic resin. The softening point of the obtained phenolic resin was 52°C. The phenol-water azeotrope before 80°C condenses and enters the reaction water storage tank, and the phenol-water azeotrope after 80°C condenses and enters the recovery phenol storage tank.

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Abstract

The present invention discloses method of cyclically utilizing phenol containing waste water in phenolic epoxy resin production. Phenol containing waste water produced in the phenolic aldehyde condensation reaction during phenolic epoxy resin production is decompression distilled to dewater in the vacuum degree higher than -0.09 MPa; the phenol-water azeotrope distilled out at the kettle temperature higher than 80 deg.c is condensed and reused as partial condensed material; and the phenol-water azeotrope distilled out at the kettle temperature higher than 80 deg.c is condensed and reused as the technological water for the condensation reaction before being rectified in the waste water rectifying tower. The tower top exhausted water contains phenol less than 2000PPM and the tower bottom recovered phenol solution has concentration of 60-90 %. The method results in lowered phenol consumption, less exhausted waste water and lowered waste water treating cost.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a method for recycling phenol-containing wastewater in the production of novolac epoxy resins. Background technique [0002] In the production of novolac epoxy resin, phenol is used as raw material for the synthesis of phenolic resin, which is condensed with formaldehyde to form the required phenolic resin. During the reaction, a large amount of water needs to be added to control the reaction speed and molecular weight. At the same time, the raw material formaldehyde contains about 63% of Water, plus the water generated by the reaction and the water produced during dephenolization with steam, the phenolic resin system contains about 52% of production wastewater and excess phenol. In the existing production process of novolac epoxy resin, the phenol-containing wastewater is first pretreated by azeotropic distillation, and the azeotrope of phenol and water produced is cooled and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C08G8/10
Inventor 冯雪峰居仁贤沈景文裘丽英夏立强黄春阳
Owner NANTONG XINGCHEN SYNTHETIC MATERIAL
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