Waste gas treatment
By undertaking projects in the fine chemicals sector, rubber tires, environmental pollution prevention and control, as well as energy conservation, it has obtained many proprietary technologies including “technology of organic tail gas decontamination for organic solvents recovery via active carbon fiber” and “technology for control of waste gas and odor in rubber factories” and much efforts on waste gas treatment in the nation.
 
Technology of organic tail gas decontamination for organic solvents recovery via active carbon fiber
 
1. Use and scope  
 
The technology uses active carbon fiber as an absorbing material and could recover high-quality organic solvents and gases from organic tail gas. The recovery rate of organic matters in the tail gas is above 99 percent. It is widely applied to the recovery of many kinds of waste gas generated during production and containing alkanes, alkenes, arenes, halohydrocarbons, ketones, aldehydes, alcohols and other organic solvents, as well as the recovery and control of organic waste gas generated during the filling up of tank cars and other intermittent operations.
 
2. Main technical indicators and key technical points
 
The technology uses active carbon fiber, which offers excellent selective absorption on organic matters. When organic waste gas passes the active carbon fiber layer, organic matters in the gas gets absorbed and intercepted by the active carbon fiber, while the nitrogen and oxygen are emitted after purification. When organic matters absorbed on the active carbon fiber reach a certain amount, they will be desorbed and regenerated into the water steam. They are disengaged from the active carbon fiber and go together into an indirect condenser where it’s condensed into a liquid. It will flow into a stratified tank for recovery. Organic matters with a boiling point lower than the cooling temperature remain in a gaseous state when water steam is condensed and could be sent to a gas-holder for recovery. The desorbed and regenerated active carbon fiber can be repeatedly used in absorption process.
 
Main technical indicators:
 
Purification and recovery rate of organic matters in waste gas: double-absorber flow: above 95 percent; tri-absorber flow: above 98 percent
 
Applicable discharge amount of waste gas: 10­2-104m3/h  
 
Life time of active carbon fiber: >1.5 years
 
Energy consumption: Save above 60 percent compared with a granular active carbon unit
 
Floor space: Save above 50 percent compared with a granular active carbon unit
 
3. Effects or benefits 
 
The technology is applied to the purification and recovery of the waste gas generated during production of organic chemical products and the tail gas discharged from organic solvent loaders and could generate good economic and environmental benefits.  
 
4. Examples of applications and dissemination
 

Year of plant establishment

Concentration (g/m3)

Flow (m3/h)

Recovered matter

Location of the unit

2003

6000

1

m-trimethylbenzene

Shanghai

2003

1000

20

Butanone, toluene

Jingmen

2002

5000

20

Methanol

Shenyang

2002

5000

20

Chlorobenzene

Shanghai

2001

300

150

Butanone, toluene

Beijing

2001

200

500

Benzene, toluene

Nanjing

1996

7000

65

Dichloroethane

Beijing

1996 

200

500 

Benzene, toluene

Urumqi

1995

7000

65

Dichloroethane

Beijing

 
Technology control of waste gas and odor in rubber factories
 
1. Source, use and scope
 
The technology could solve the difficulty of controlling waste gas and odors generated during rubber mixing in the internal mixing workshop and treat the R-SH, SOx, methyl benzene, formaldehyde, H2S, ammonia, methanthiol and other gas pollutants in rubber mixing waste gas to meet standards before emissions. It could be widely applied in the rubber-processing sector. 

2.  Innovative points and advancement

The scrubber technology applies a new-type filler, atomizing technology, chemical agents and PLC technology in a packed column to treat gas with large blast volume, low concentration and peculiar smell. It features small resistance, low energy consumption, low noise and high treatment efficiency, can treat ammonia gas, hydrogen sulfide, hydrogen fluoride and other gases. When it is used with special-purpose chemical reagents, it may generate a treatment effect on formaldehyde, methanthiol and other organic gases with a peculiar smell.

3. Effects or benefits

Technology for control of rubber mixing waste gas and odor in rubber factories could treat the foul smell generated by rubber mixing in internal mixers. It produces desirable environmental and economic benefits.

The environmental benefits appear obvious. The technology could reduce emissions of gas with a peculiar smell, alleviate pressures of enterprises from environmental pollution in areas near them and improve the environment of local residents.

4. Examples of applications and dissemination

The technology has been used to control gas pollution in vulcanization and mixing sections of rubber factories. 15 sets of treatment units were built.

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