Waste gas treatment methods in chemical production processes
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It is normal for exhaust gases to be generated during chemical production. Existing methods include washing, adsorption and absorption, incineration, emission into the atmosphere, and negative pressure absorption; each factory chooses the method suitable for its needs. Are there any other good, low-cost treatment methods? Our factory mainly uses washing and negative pressure absorption.
Reply 1# hao101029: Could you tell me the main components of exhaust gases?
Reply 1# hao101029 The best way is to recycle. Secondly, it is used as fuel for combustion to provide energy. Once again, it’s a blanking process. Finally, there are washing, absorption, neutralization, incineration, etc.
We use catalytic combustion to absorb the harmful substance benzene from maleic anhydride exhaust gases
We are in the fine chemicals industry; the solvents used are recovered through absorption； During the production process, waste hydrochloric acid gas is generated; it is absorbed using negative pressure and then neutralized with alkaline water before being discharged.
Reply to 8# Little Clerk: We are an electronic chemicals factory; the exhaust gases mainly consist of distilled acidic gases, and a washing method is used, with water coming into contact with the gases to absorb them
Reply to 1# hao101029: Currently, the methods used for exhaust gas treatment in factories across China are the ones mentioned above; no new methods have emerged yet. Your washing and negative pressure absorption methods are quite good. From an environmental protection perspective, incineration and high-altitude emission methods are not allowed; the waste must be treated to meet specified standards before it can be released. It is acceptable if incineration results in harmless substances, but if harmful substances are produced, those as well must be treated to meet standards before release is possible. Emissions at high altitudes are also not allowed; no matter how high, harmful substances remain in the atmosphere, so such emissions are prohibited. These substances must be converted into harmless forms before they can be released.
I have been working on exhaust gas thermal oxidizers for a few years; after that, the heat is recovered using waste heat boilers, and the gases are then discharged after being adsorbed and washed.
Our previous company used exhaust gas, compressed by a compressor, as fuel gas.