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Comprehensive utilization of phenol-containing wastewater

A technology for phenolic wastewater and wastewater, applied in the field of thermosetting liquid phenolic resin, can solve the problems of wastewater generation, failure to achieve zero discharge of wastewater, and failure to efficiently utilize phenol-containing wastewater.

Inactive Publication Date: 2011-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's patent 200810124388.0 uses paraformaldehyde instead of 37% liquid formaldehyde to produce thermoplastic phenolic resin, but there is still waste water generated, and zero discharge of waste water is not achieved
Chinese patent 201010208432.3 provides a method of using paraformaldehyde, 37% liquid formaldehyde and phenolic wastewater to prepare a non-dehydrating phenolic resin in a certain proportion. This phenolic resin can be used to make a consolidation mold, but in the preparation process Liquid formaldehyde is used, so there is no efficient use of phenolic wastewater

Method used

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  • Comprehensive utilization of phenol-containing wastewater
  • Comprehensive utilization of phenol-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthetic phenolic rock wool glue

[0026] 1) Add 80g of paraformaldehyde and 160g of phenol-containing wastewater into a four-necked flask equipped with mechanical stirring, a condenser and a thermometer, and cool at a constant temperature of 90°C for 40 minutes;

[0027] 2) Pour out 120g of the upper formaldehyde solution for later use, add 100g of phenol into the four-necked bottle, and heat up to 75°C for 30min;

[0028] 3) Pour 120g of formaldehyde solution into a four-neck bottle, heat up to 90°C for 35 minutes, cool down to 75°C, add 3g of urea, stir for 10 minutes, adjust the pH value to 7-8, cool down to 35°C and discharge .

[0029] The obtained product is a reddish-brown transparent liquid phenolic resin with a viscosity of 15-20mpa.s (25°C), a solid content of 41-45%, free phenol≤7.5%, and free aldehyde<0.5%. It can be used as rock wool glue, Used in the manufacture of rock wool boards.

Embodiment 2

[0031] Synthetic phenolic wood glue

[0032] 1) Add 60g of paraformaldehyde and 100g of phenol-containing wastewater into a four-neck flask equipped with a mechanical stirrer, a condenser and a thermometer, and cool at a constant temperature of 90°C for 40 minutes;

[0033] 2) Pour out 80g of the formaldehyde solution for later use, add 100g of phenol into the four-necked bottle, and heat up to 80°C for 20 minutes;

[0034] 3) Pour 80g of formaldehyde solution into a four-necked bottle, add 4g of sodium hydroxide, and raise the temperature to 92°C for 45 minutes, then cool down to 35°C and discharge.

[0035] The obtained product is a liquid phenolic wood glue with a viscosity of 400-500mpa.s (25°C) and a solid content of 55-60%, which can be applied to glue for wood bonding.

Embodiment 3

[0037] Synthetic expandable phenolic resin

[0038] 1) Add 100g of phenol, 25g of paraformaldehyde, 20g of wastewater containing phenol, and 3g of magnesium oxide into a four-neck flask equipped with mechanical stirring, a condenser and a thermometer, and heat up to 82°C for 40min;

[0039] 2) Add 30g of paraformaldehyde to the four-necked flask, and then slowly raise the temperature to 95°C for 90 minutes;

[0040] 3) After adding 3g of melamine, continue to react for 15 minutes and cool down to 35°C to discharge;

[0041] The obtained product is a reddish-brown liquid phenolic resin with a viscosity of 2000-3000mpa.s (25°C) and a solid content of 78-82%. It can be used to prepare phenolic foam boards and be used as building materials for fire-retardant and heat-retaining.

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Abstract

The invention relates to a method for treating phenol-containing wastewater by regulating the pH value of the phenol-containing wastewater generated in phenolic resin (comprising thermoplastic and thermoset phenolic aldehyde) production and synthesizing into thermoset liquid phenolic resin having different purposes. The thermoset liquid phenolic resin can be applied to producing rockwool glue, wood glue, expandable phenolic resin, grinding materials, coatings and the like; the wastewater is comprehensively utilized; and the zero emission of the phenol-containing wastewater generated in the phenolic resin production is realized. The thermoset liquid phenolic resin is prepared from the following raw materials in part by mass: 100 parts of phenol, 38 to 90 parts of paraformaldehyde, 0.5 to 5 parts of catalyst, 20 to 180 parts of phenol-containing wastewater and 0.5 to 20 parts of modification aid.

Description

technical field [0001] The present invention relates to a method for synthesizing thermosetting liquid phenolic resins for various purposes by utilizing phenolic waste water produced in the production of phenolic resins, and its applications include rock wool glue, wood glue, expandable phenolic resin, grinding materials and coatings, etc. Thus the comprehensive utilization of phenolic wastewater has been realized. technical background [0002] As a synthetic resin with a history of industrialization for hundreds of years, phenolic resin has a higher curing temperature compared with other thermosetting resins. The mechanical properties and chemical corrosion resistance of the cured resin are comparable to unsaturated polyester, but its raw material price is low and the process is simple. , the product is stable in size and heat-resistant, flame-resistant, corrosion-resistant, low-smoke and low-toxicity, and good electrical insulation, so it is widely used in aerospace and ai...

Claims

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Application Information

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IPC IPC(8): C08G8/10C02F1/66C04B26/12C09J161/10C08L61/10C09D163/04
Inventor 苏志强姚亚琳于征张安阳陈晓农
Owner BEIJING UNIV OF CHEM TECH
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