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Comprehensive utilization method of wastewater of ternary monomer production process

A production process and three-monomer technology, which is applied in the field of comprehensive utilization of process wastewater after removing methanol from three monomers, can solve the problems of no comprehensive utilization, resin inactivation, high energy consumption, etc., and achieve the effect of zero-emission clean production

Active Publication Date: 2016-04-20
WEIFANG WORLD CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages are: (1) Since the three-monomer wastewater contains a variety of organic substances with different structures and properties, in the resin adsorption process, it is very likely to cause resin deactivation, resin adsorption amount reduction, poor adsorption effect, and low adsorption efficiency. Consequences; (2) The project needs to be frozen to reduce the cooling crystallization and precipitation temperature of the three monomers, high energy consumption leads to high operating costs, and the realization of industrial-scale operation requires large investment and high operating costs
[0007] Chinese patent (patent number: 201410262626.X, patent name: method for extracting isophthalic acid-5-sodium sulfonate from three-monomer production wastewater) proposes to add organic precipitant and sodium hydroxide to three-monomer production wastewater , activated carbon, deionized water, sulfuric acid and activated carbon to extract isophthalic acid-5-sodium sulfonate and sodium sulfate decahydrate from three-monomer production wastewater, although this program has made progress in the comprehensive utilization of three-monomer wastewater, but New solid hazardous waste activated carbon has been added, new pollutants have been added, and water is still not comprehensively utilized
[0008] Chinese patent (patent number: 201410356437.9, patent name: a method for extracting isophthalic acid-5-sodium sulfonate from three-monomer production wastewater) uses trioctylamine and bis-tertiary amine 2,4-di(N,N- Dihexyl) aminododecylbenzene two-component complexing agent, 2-heptyl undecanol is selected as co-solvent, sulfonated kerosene and n-octanol two-component are used as diluent, and complex extraction process is adopted. The method for extracting isophthalic acid-5-sodium sulfonate from the waste liquid at the bottom of the tower after methanol is recovered from the three monomers, although the economic benefits of the three monomer products have been improved and the comprehensive utilization of resources has been realized, there is still no comprehensive solution to water Utilization and Sodium Sulfate Extraction Issues
[0011] (1) The comprehensive utilization value of the three-monomer wastewater is not high, the comprehensive utilization of all materials has not been realized, the pure water that meets the water requirements for the three-monomer production process has not been obtained, and the problems of water utilization and wastewater pollution have not been solved;
[0012] (2) The extraction problem of sodium sulfate with high purity is not solved;
[0013] (3) The recovery of three-monomer from three-monomer wastewater has a low yield and poor quality;
[0014] (4) Although sodium isophthalic acid-5-sulfonate was recycled from the three-monomer wastewater, other components in the wastewater were not fully utilized, and the fundamental pollution problem was not solved;
[0015] (5) After extracting some useful components, new pollution is added, and the existing treatment schemes and devices have high operating costs, large investment, and cumbersome operations

Method used

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  • Comprehensive utilization method of wastewater of ternary monomer production process
  • Comprehensive utilization method of wastewater of ternary monomer production process
  • Comprehensive utilization method of wastewater of ternary monomer production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 A kind of method for the comprehensive utilization of three-monomer production process wastewater

[0050] Include the following steps:

[0051] Step 1. Concentrate and prepare pure water

[0052] The wastewater after methanol removal is evaporated and concentrated by the MVR device to obtain pure water conforming to the production of three monomers and containing three monomers (dimethyl isophthalate-5-sodium sulfonate), monomethyl isophthalate- Concentrate of organic substances such as sodium 5-sulfonate and sodium 5-sulfonate isophthalate.

[0053] The specific operation is as follows:

[0054] (1) Feed

[0055] The wastewater after methanol removal is pumped to the raw material tank of the system, and the wastewater after methanol removal is pumped into the plate heat exchanger from the raw material tank by the feed pump, and the flow rate of the pump is controlled to be 2m 3 / h, outlet pressure 0.2MPa.

[0056] (2) Heat exchange

[0057] The wast...

Embodiment 2

[0101] Embodiment 2 A kind of method for the comprehensive utilization of three-monomer production process wastewater

[0102] Include the following steps:

[0103] Step 1. Concentrate and prepare pure water

[0104] The wastewater after methanol removal is evaporated and concentrated by the MVR device to obtain pure water conforming to the production of three monomers and containing three monomers (dimethyl isophthalate-5-sodium sulfonate), monomethyl isophthalate- Concentrate of organic substances such as sodium 5-sulfonate and sodium 5-sulfonate isophthalate.

[0105] The specific operation is as follows:

[0106] (1) Feed

[0107] The wastewater after methanol removal is pumped to the raw material tank of the system, and the wastewater after methanol removal is pumped into the plate heat exchanger from the raw material tank by the feed pump, and the flow rate of the pump is controlled to be 3m 3 / h, outlet pressure 0.25MPa.

[0108] (2) Heat exchange

[0109] The was...

Embodiment 3

[0149] Embodiment 3 A kind of method for the comprehensive utilization of three-monomer production process wastewater

[0150] Include the following steps:

[0151] Step 1. Concentrate and prepare pure water

[0152] The wastewater after methanol removal is evaporated and concentrated by the MVR device to obtain pure water conforming to the production of three monomers and containing three monomers (dimethyl isophthalate-5-sodium sulfonate), monomethyl isophthalate- Concentrate of organic substances such as sodium 5-sulfonate and sodium 5-sulfonate isophthalate.

[0153] The specific operation is as follows:

[0154] (1) Feed

[0155] The wastewater after methanol removal is pumped to the raw material tank of the system, and the wastewater after methanol removal is pumped into the plate heat exchanger from the raw material tank by the feed pump, and the flow rate of the pump is controlled to be 4m 3 / h, outlet pressure 0.3MPa.

[0156] (2) Heat exchange

[0157] The wast...

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Abstract

The invention provides a comprehensive utilization method of wastewater of a ternary-monomer production process. The comprehensive utilization method comprises concentration, preparation of pure water, separation for obtaining of sodium sulfate, distillation and preparation of ternary monomers. According to the pure water prepared with the method, the content of sulfate radical SO4<2-> is smaller than or equal to 0.2 mg / kg, the content of Cl<-> ions is smaller than or equal to 0.3 mg / kg, and the content of Fe<3+> ions is smaller than or equal to 0.2 mg / kg; the electric conductivity is smaller than or equal to 2 us / cm; sodium sulfate with the content higher than 95% is obtained; the ternary monomers are prepared, the main quality indexes of a product are shown as follows: the acid value is smaller than or equal to 0.52 mgKOH / g, the saponification value is smaller than or equal to 379.21 mgKOH / g, the content of sulfate radical is smaller than or equal to 58 mg / kg, the content of Fe<3+> is smaller than or equal to 2.06 mg / kg, the content of Cl<-> is smaller than or equal to 4.26 mg / kg, the chroma (platinum-cobalt colormetry) is smaller than or equal to 15 (color number), the water content is smaller than or equal to 0.25%, and the light absorbency is smaller than or equal to 0.04.

Description

technical field [0001] The invention belongs to the field of waste water treatment in the organic chemical industry, and specifically relates to a method for comprehensive utilization of process waste water after removing methanol from three monomers. Background technique [0002] Trimonomer (chemical name: dimethyl isophthalate-5-sodium sulfonate) is an important differential modifier, mainly used in polyester, film and other aspects. Among them, polyester is the main application field, which is used as the third monomer of cationic modified polyester CDP. Because CDP fibers contain sulfonic acid groups, they have good affinity for cationic dyes. The dyed fibers are bright in color, complete in color spectrum, and can be deeply dyed. Therefore, this fiber has developed rapidly abroad. At present, most of the domestic three-monomer industry adopts the oleum sulfonation method for production. The production of 1 ton of three-monomer produces about 4 tons of waste water. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32C07C309/58C01D5/16C02F9/10C02F103/36
CPCC01D5/16C02F1/08C02F1/447C02F9/00C02F2103/36C02F2301/04C07C303/32C07C309/58
Inventor 郭学阳刘倩孙春辉赵小云卢洪亮王亮王青青刘梅刘海杰曾现亮曹振平黄如现梁志丽邢星
Owner WEIFANG WORLD CHEM
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