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Method of recycling organic substances from polyurethane synthetic leather waste gas

A technology of organic matter and synthetic leather, applied in the preparation of organic compounds, separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problems of insufficient purity of DMF and toluene, low recovery efficiency, and inability to absorb, etc., to reduce secondary Pollution, high recovery efficiency, and the effect of reducing the amount of use

Active Publication Date: 2016-12-07
SHANGHAI JUYOU CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using water as an absorbent is: water can absorb DMF in the waste gas, but water cannot absorb organic substances such as toluene and methyl ethyl ketone in the waste gas; the disadvantage of using DMF as an absorbent is: the boiling point of DMF is low (154 ° C). Large, it is necessary to add another absorption tower on the basis of the existing absorption tower, and it takes two adsorptions to separate DMF from toluene, methyl ethyl ketone and other organic substances
In addition, the existing methods for recovering organic matter in waste gas still have defects such as low recovery efficiency and insufficient purity of recovered DMF and toluene.

Method used

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  • Method of recycling organic substances from polyurethane synthetic leather waste gas
  • Method of recycling organic substances from polyurethane synthetic leather waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1Shown, the method for recovering organic matter in a kind of polyurethane synthetic leather waste gas of the present invention, it adopts ionic liquid, liquid ester as special absorbent (this special absorbent boiling point is higher than 300 ℃, volatility is very little, does not need to be absorbed in the absorption tower) It will be carried to the top of the tower, and the exhaust gas at the top of the absorption tower can be directly discharged, so the absorbent can be separated from toluene, methyl ethyl ketone, DMF and other organic substances through one absorption), in the absorption tower, through low-temperature spraying The method absorbs and treats the cooled synthetic leather waste gas that flows upstream. After the organic substances such as toluene, butanone and DMF in the waste gas are absorbed by the low-temperature absorbent, they enter the desorption tower for desorption, separation and recovery of toluene, butanone and low-boiling orga...

Embodiment 2

[0051] A method for recovering organic matter in waste gas of polyurethane synthetic leather according to the present invention, the specific process is the same as that of Example 1, the difference is that: absorption process conditions: the operating temperature of the absorption tower is 5°C, and the tower pressure is 100KPa absolute pressure; light component desorption Process conditions: desorption tower temperature 150°C, tower pressure 100KPa absolute pressure; reorganization desorption process conditions: vacuum distillation tower temperature 130°C, tower pressure 30KPa absolute pressure;

[0052] The reflux ratio in above-mentioned steps (2) and step (3) is 5;

[0053] The mass percentage of each component in the special absorbent is: 55% of ionic liquid, 5% of dibutyl terephthalate, 25% of butylene terephthalate, and 15% of ethylene isophthalate; among them, The ratio between ionic liquid and dibutyl terephthalate is 11:1; the ratio between butylene terephthalate and...

Embodiment 3

[0055] A method for recovering organic matter in waste gas of polyurethane synthetic leather according to the present invention, the specific process is the same as in Example 1, the difference is that: absorption process conditions: the operating temperature of the absorption tower is 8°C, and the tower pressure is 150KPa absolute pressure; light component desorption Process conditions: desorption tower temperature 180°C, tower pressure 150KPa absolute pressure; recombination desorption process conditions: vacuum distillation tower temperature 150°C, tower pressure 70KPa absolute pressure;

[0056] The reflux ratio in above-mentioned steps (2) and step (3) is 0.5;

[0057] The mass percentage of each component in the special absorbent is: 60% of ionic liquid, 20% of dibutyl terephthalate, 15% of butylene terephthalate, and 5% of ethylene isophthalate; among them, The ratio between ionic liquid and dibutyl terephthalate is 3:1; the ratio between butylene terephthalate and ethy...

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Abstract

The invention discloses a method of recycling organic substances from polyurethane synthetic leather waste gas. In the method, an ionic liquid and a liquid ester are employed as special absorbers. In an absorption column, cooled synthetic leather waste gas which flows countercurrent is treated in a low-temperature spray manner, wherein organic substances, such as methylbenzene, butanone and DMF, in the waste gas are absorbed by a low-temperature absorber. The absorber then is fed into a desorption column to carry out desorption and separation to recycle the methylbenzene and butanone, and then is fed into a pressure-reduced distillation column to carry out desorption and separation to recycle the DMF. The special absorber contains 50-70% of the ionic liquid, 5-25% of dibutyl terephthalate, 15-25% of butylene terephthalate and 5-15% of ethylene glycol m-phthalate. The special absorber is more than 300 DEG C in boiling point and is suitable for absorbing the methylbenzene, butanone and DMF. The method can recycle the DMF and the methylbenzene at high recycle efficiency, wherein the recycled DMF is more than 99% in purity and low-boiling-point organic substances, such as the recycled methyl and butanone, are more than 99.5% in purity.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment and relates to a method for recovering organic matter in waste gas of polyurethane synthetic leather. Background technique [0002] Synthetic leather is an important part of the plastics industry, and its application fields cover all aspects of people's daily life. It has excellent mechanical properties such as wear resistance and aging resistance, and also has the advantages of convenient processing and low price. At present, the production of synthetic leather generally uses polyurethane PU as the basic raw material of the base layer and the surface layer, and is prepared by solution polymerization through DMF (N,N-dimethylformamide) and toluene as the main solvent. Due to the use of a large amount of volatile organic solvents in the production process, especially in the production surface treatment process, when the products coated with a large amount of organic solvents are treate...

Claims

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Application Information

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IPC IPC(8): C07C15/06C07C7/11C07C49/10C07C45/78C07C233/03C07C231/24C08J11/02
CPCC07C7/11C07C45/783C07C231/24C08J11/02C07C15/06C07C49/10C07C233/03
Inventor 汪少朋屈一新李红彬甘胜华白丁
Owner SHANGHAI JUYOU CHEM ENG
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