A kind of treatment method of waste gas in synthetic leather production process

A production process and treatment method technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as high cost of distilled water, troublesome waste gas treatment methods, complicated process flow, etc., to increase relative humidity and reduce cleaning difficulty , the effect of high spray intensity

Active Publication Date: 2022-06-24
浙江金潮实业有限公司
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the basic method of absorbing waste gas in the dry production process of synthetic leather is mainly collected by DMF absorption tower, and this method of using DMF absorption tower for collection can only be used to collect DMF waste gas. After collecting DMF waste gas at this stage Other waste gas treatment methods are more troublesome, and the wettability of the packing is low under the condition of very low liquid distribution density, which will lead to low absorption efficiency of the packed tower. None of them can ensure the high wettability of the packing and improve the absorption efficiency It is a method to reduce the distillation load and cost of waste liquid at the same time, and when absorbing DMF waste gas, there are problems such as complicated process flow, more thorough packing cleaning of viscous substances, large water consumption and waste liquid discharge, and high cost of distilled water. Except for DMF In addition, there are other components of waste gas. If only the recovery of DMF is considered in the production process, the discharge of other waste gases will not meet the environmental protection requirements, and further treatment is required.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of treatment method of waste gas in synthetic leather production process
  • A kind of treatment method of waste gas in synthetic leather production process
  • A kind of treatment method of waste gas in synthetic leather production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Taking a single line of 40000m³ / h, 100°C, 4500mg / m³ DMF, and other components of 500mg / m³ as an example, the outlet temperature of the refrigerated spray circulating liquid is considered as 27°C, the cooling coefficient is considered as 8, and the standard gas volume of the exhaust gas is 29276m³ / h , the cooling and condensing load is Q=550000kcal / h, the heat exchange surface of the cooler is about 350㎡, the cooling fan is 3kw, the circulating water pump is 5.5kw, the refrigeration load is 100000kcal / h, with a 20t / h cooling tower, the power of the refrigerator is 18.5kw, The air pressure of the fan is 4000Pa, the air volume is 33000m³ / h, the power is 55kw, the circulating spray pump is 5.5kw, the desorption fan is 2500Pa, 3600m³ / h, the power is 5.5kw, the total installed power of the system is 93kw, and the power consumption per hour is 79 degrees according to the demand factor of 0.85.

[0047] The cooling condenser adopts a large tube outer film evaporative condenser. ...

Embodiment 2

[0051] Usually, in chemical absorption process, pure absorbent is added to the top of the tower and exhaust gas through the liquid distributor for pure counter-flow mass transfer absorption, so as to have the maximum mass transfer absorption driving force (effective maximum mass transfer concentration difference), but because DMF is water-soluble The water consumption of the dry-process synthetic leather waste gas absorption packing tower is very small, and the wettability of the packing in such a small amount of water (0.15m³ / ㎡.h) will also affect the absorption efficiency, so it is currently used. The dry absorption tower adopts a 3-stage or 4-stage circulation process. Although part of the absorption mass transfer concentration difference is destroyed due to the circulation of the absorption liquid, it can ensure the wettability of the packing and the absorption effect. Under the condition that the DMF components of the exhaust gas discharged from the top reach the standard,...

Embodiment 3

[0056] The above example 2 only considers DMF recovery. If the waste gas of 5000mg / m³ is preferentially collected to remove most of the DMF in the range of 4400-1600mg / m³, there are still other harmful solvent components of about 500mg / m³, which is far from reaching the emission standard and needs to be further However, if the 3-stage or 4-stage circulation of the dry absorption tower is used alone, the temperature of the exhaust gas reaches the top of the tower as high as 37 °C and the relative humidity is as high as 95%, which will affect the subsequent adsorption and concentration efficiency to a certain extent, even if the hydrophobic zeolite is used for concentration. The purification efficiency of the runner is also 60-70%, and the cost of this method is too high; if the lower-cost activated carbon fiber is used, the efficiency of the concentrator is only 50-60%; if the temperature is lowered to 35 °C at this time, the relative humidity will be reduced. To about 50%, it i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to view more

Abstract

A treatment method for waste gas in the production process of synthetic leather, comprising firstly spraying and washing 4-stage waste gas absorption and first cooling and condensing and then freezing treatment; first spraying and washing 4-stage waste gas absorption, waste gas centralized collection, and synthetic leather The mixed waste gas generated by the processing technology at 90-110°C is collected centrally, and the concentration of the collected gas reaches 4900-5100mg / m 3 DMF accounts for 4400-4600mg / m in the mixed exhaust gas components 3 , other exhaust gas components accounted for 400‑600mg / m 3 ;Collect and form mixed waste gas concentration up to 5000mg / m 3 Finally, the mixed exhaust gas is filtered through the reverse osmosis membrane filter to remove some solids and sticky substances, and then cooperates with the cooling tower to undergo first cooling and condensation and then freezing treatment. The first cooling and condensation followed by freezing treatment is divided into cooling condensation treatment and freezing treatment , the cooling and condensation treatment is to use the external spray cooler to condense the exhaust gas to obtain a high-concentration waste liquid with a concentration of 70-80% and a temperature of 40-50°C.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for treating waste gas in a synthetic leather production process. Background technique [0002] The PU resin used in the production of synthetic leather is dissolved in an organic solvent. The solvent is mainly composed of DMF (N,N-dimethylformamide), toluene and methyl ethyl ketone. In wet production, DMF is washed in water and dried. DMF is volatilized into the hot air of the oven in the production of the dry method. If the wet method washing water and the dry method hot air are directly discharged, it will not only waste DMF, but also pollute the environment. At present, the DMF wastewater from the wet process production line has been basically recovered. While protecting the environment, the waste gas can be recycled and utilized to increase economic benefits. The hot air discharged from the dry process production line has also been basically collected and tre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D47/06B01D53/18B01D53/14B01D53/04
CPCB01D53/002B01D47/06B01D53/18B01D53/1487B01D53/1412B01D53/04B01D2258/02B01D2252/103B01D2257/40B01D2253/102B01D2259/40086Y02A50/20
Inventor 苏维星王超林孙张廖建华魏侯勇
Owner 浙江金潮实业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap