Method for purifying benzene containing waste gas and recycling benzene and system thereof

Abstract

The invention relates to the field of waste gas treatment, and in particular relates to a method for purifying benzene containing waste gas and recycling benzene and a system using the method. The method comprises the following steps of: mixing waste mineral oil with water to obtain a mineral oil emulsion; washing and absorbing the benzene containing waste gas by using the mineral oil emulsion to discharge the up-to-standard waste gas and obtain the benzene absorbed mineral oil emulsion; and breaking the benzene absorbed mineral oil emulsion, and carrying out oil-water separation to obtain the benzene containing mineral oil. The system comprises an oil-water emulsifier unit, an emulsion storage tank, a washing absorbing tower, an emulsion breaking sediment filter device, and an oil-water separation device, wherein the oil-water emulsifier unit is connected with the emulsion storage tank, the emulsion storage tank is connected with the washing absorbing tower through a pump and is connected with the emulsion breaking sediment filter device through a valve, and the emulsion breaking sediment filter device is connected with the oil-water separation device. The method for purifying the benzene containing waste gas and recycling the benzene and the system by using the method provided by the invention treat wastes with processes of wastes against one another, turn waste into wealth, and are low in cost, high in efficiency, energy-saving, environment-friendly, and safe.

Description

technical field [0001] The invention relates to the field of waste gas treatment, in particular to a method and system for purifying waste gas containing benzene and recovering benzene. Background technique [0002] my country's smog weather is getting more and more serious. The cause of smog is not only the pollution from fuel oil and coal burning, but also the pollution from volatile organic compounds (VOC). [0003] The benzene series (toluene, xylene, etc.) emitted by industry are the main pollutants of volatile organic compounds. There are many ways to purify benzene-containing waste gas: high-temperature, high-concentration multi-purpose catalytic combustion method; low-concentration waste gas purification at room temperature (such as paint spraying in shipbuilding, furniture, automobile manufacturing, etc.), the most commonly used method is "activated carbon adsorption". [0004] At present, most domestic purification methods for benzene-containing waste gas use the ...

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Problems solved by technology

[0008] Therefore, the current purification of benzene-containing waste gas is costly and wastes a lot of energy

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