A process for recycling waste water from unsaturated polyester resin industry

A technology of polyester resin and industrial wastewater, applied in the direction of heating water/sewage treatment, etc., can solve the problems of non-universal technical methods, complex characteristics of wastewater quality, and high cost of wastewater treatment, and solve the key technical problems of engineering scale-up, The effect of improving the conversion rate of raw materials and improving the resource recovery rate

Inactive Publication Date: 2011-12-21
NANJING UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention synthesizes naphthalene-based high-efficiency water reducer by comprehensive utilization of unsaturated polyester resin wastewater, which is a better method for comprehensive utilization of resources. Technical methods for products other than polyester resin are not universal
[0007] At present, due to the lack of effective and economical wastewater treatment technologies and methods for the characteristics of high-concentration unsaturated polyester resin production wastewater, the wastewater treatment costs in the industry are high, a large amount of useful resources are wasted, and it is difficult to meet the standards.

Method used

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  • A process for recycling waste water from unsaturated polyester resin industry
  • A process for recycling waste water from unsaturated polyester resin industry

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The high-concentration unsaturated polyester wastewater produced in the production process of an unsaturated resin enterprise, the composition and concentration are: phthalic anhydride, maleic anhydride, oxalic acid, diethylene glycol, propylene glycol, glycerin, n-butanol, and the COD is 80000mg / L , utilize the present invention to carry out processing step as follows:

[0024] 1) Azeotropic distillation process: Cyclohexane is used as an entrainer, and the entrainer and unsaturated resin wastewater are added into the tower from the raw material inlet of the azeotropic rectification tower filled with wire mesh corrugated packing at a volume ratio of 0.5:1. ; At the top of the azeotropic distillation tower, after the steam of the material is condensed by the condenser of the azeotropic distillation tower, part of it flows back into the azeotropic rectification tower, and the other part is taken out and enters the separation tank to automatically stratify into water phase...

Embodiment 2

[0027] The composition and concentration of high-concentration unsaturated polyester wastewater produced during the production process of a resin enterprise are: ethylene glycol, propylene glycol, phthalic anhydride, and terephthalic acid. COD is 100000mg / L, utilizes the present invention to carry out processing step as follows:

[0028] 1) Azeotropic distillation process: n-propanol is used as an entrainer, and the entrainer and unsaturated resin wastewater are added to the tower from the raw material inlet of the azeotropic distillation column filled with Pall ring packing at a volume ratio of 0.7:1 ; At the top of the azeotropic distillation tower, after the steam of the material is condensed by the condenser of the azeotropic distillation tower, part of it flows back into the azeotropic rectification tower, and the other part is taken out and enters the separation tank to automatically stratify into water phase and oil phase. Phase, the reflux ratio is 1.5:1, the operating...

Embodiment 3

[0031] The composition and concentration of high-concentration unsaturated polyester wastewater produced during the production process of a resin factory are: diethylene glycol, maleic anhydride, and styrene. COD is 120000mg / L, utilizes the present invention to carry out processing step as follows:

[0032] 1) Azeotropic distillation process: carbon tetrachloride is used as an entrainer, and the entrainer and unsaturated resin wastewater are added to the tower from the raw material inlet of the azeotropic distillation tower filled with PVC inclined tube packing at a volume ratio of 0.9:1. Inside; at the top of the azeotropic distillation tower, after the steam of the material is condensed by the condenser of the azeotropic distillation tower, a part of it flows back into the azeotropic rectification tower, and the other part is taken out and enters the separation tank to automatically stratify into water phase and The oil phase, the reflux ratio is 2:1, the operating pressure ...

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Abstract

The invention discloses a process for recycling waste water from unsaturated polyester resin industry, which is characterized in that: usesful resources in the waste water are separated and recovered by an azeotropic distillation separation recovery technique; and the recovered ingredients are used to prepare a high-performance unsaturated polyester resin, so waste is changed into valuable materials and the product yield and performance of the unsaturated polyester resin are improved. The process solves the problem that resources in waste water cannot be separated and recycled with high efficiency and low energy consumption and burnt as waste in the current industry is solved, and the materials in the waste water are recovered and recycled to form the high-performance unsaturated polyester resin product; and thus, the environment pollution is reduced, and the development of circular economy is promoted. Therefore, the process has great economic and social benefit.

Description

Technical areas: [0001] The invention belongs to the technical fields of chemical industry and environmental protection, and relates to a treatment method for high-concentration unsaturated polyester wastewater treatment and resource utilization. Specifically, it is a high-concentration wastewater resource utilization process in the unsaturated polyester resin industry. Background technique: [0002] Unsaturated polyester resin (UPR) has excellent mechanical properties, electrical properties and chemical corrosion resistance, and has simple processing technology. It is widely used in industry, agriculture, transportation, transportation and other fields. At present, my country's annual output is as high as 1.5 million tons. The chemical reaction in the production of unsaturated polyester is polycondensation reaction. During the polycondensation reaction, small molecular water is generated, thus forming production wastewater. This production wastewater is evaporated from the ...

Claims

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Application Information

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IPC IPC(8): C02F1/04
Inventor 赵贤广徐炎华李武朱明新陆曦许培圣沈洪马越群朱锐
Owner NANJING UNIV OF TECH
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