I. Industry Overview: In the pharmaceutical industry, a large number of organic solvents are used (such as DMF, benzenes, organic amines, ethyl acetate, methylene chloride, acetone, methanol, ethanol, methyl ethyl ketone, ether, dichloroethane, acetic acid, Chloroform, etc.), volatilizes and forms a gas with a pungent odor and a foul odor, which is toxic. Long-term emissions will inevitably deteriorate the quality of the regional atmospheric environment and cause harm to the bodies of nearby residents.

2. Waste gas source: Waste gas mainly occurs in operation units such as feeding, reaction, solvent recovery, filtration, centrifugation, drying, and discharge.

Composition of exhaust gas: DMF, benzene series, organic amine, ethyl acetate, dichloromethane, acetone, methanol, ethanol, methyl ethyl ketone, ether, dichloroethane, acetic acid, chloroform, etc.

Fourth, the characteristics of exhaust gas:

1. There are many discharge points, large emissions, and severe fugitive emissions. The yield of pharmaceutical and chemical products is low, the solvent consumption is large, the solvent exhaust gas discharge points are many, and the solvent exhaust gas is mostly low-level and fugitive emissions, and the solvent exhaust gas concentration is high.

2. There are many intermittent emissions. The reaction process is basically a batch reaction, and the solvent off-gas is also emitted intermittently.

3. Unstable emissions. The composition of the solvent exhaust gas is complex, and the types and concentrations of pollutants vary widely. The same set of devices may emit pollutants of different natures at different times.

4. The influence range of solvent exhaust gas is wide. Most of the VOCs in solvent exhaust gas have malodorous properties, have low olfactory domain value, are easy to diffuse, and have a wide range of influence.

Five, common processing technology

Exhaust gas treatment process
Purification technology principle
Work subject
Suitable for purifying gas
Spray absorption
Dissolve water and other chemicals with malodorous organics
Removal by oxidation, neutralization, complexation and salt formation
Water-soluble gas component
Good processing efficiency, wide applicability, multi-stage absorption,
Convenient operation, low operating cost, and secondary pollution of wastewater

Acid gas composition

Alkali gas composition


Contains microorganisms, 

easy Oxidized malodor components

UV photolysis catalysis
C-band UV irradiation for high activity
Oxides work together to solve organic molecules
Specific UV lamps

Gas with low concentration easily 

decomposed and unstable molecular structure

It has the advantages of small footprint, convenient operation and low operating cost. 

The processing effect is average and it is difficult to use alone

Activated carbon adsorption

Adsorption of organic malodor using activated 

carbon porous structure and active functional groups

Activated carbon

Low concentration of various 

malodorous organic / inorganic gases

The equipment is simple and the processing efficiency is 90%. 

It is generally used for compound gas end purification, 

and the front end is equipped with pretreatment such as pickling, 

alkaline washing, dust removal, etc .; secondary pollution, 

large operation and maintenance workload, and high operating cost.

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