The Concentration Effect of Membrane Separation in Waste Gas from Coating Production

The Concentration Effect of Membrane Separation in Waste Gas from Coating Production

In the coating production process, feeding, dispersion, grinding and packaging processes will produce a large amount of organic waste gas. These exhaust gases are usually large in air volume and low in concentration, and the main components are solvent vapors such as ethyl acetate, toluene, and xylene. If the direct treatment, whether using condensation or combustion, the economy is relatively poor.

The function of membrane separation technology is to concentrate the waste gas first, and convert the large air volume and low concentration waste gas into small air volume and high concentration air flow, so as to create conditions for subsequent treatment.gas separation membraneThere are differences in permeation rates for organic and air components. Organic vapor molecules have high solubility and fast diffusion in the membrane, and can preferentially penetrate the membrane layer. However, the permeation rate of air components such as nitrogen and oxygen is slow and is trapped. When the paint exhaust gas passes through the membrane module, most of the air is directly discharged, and the organic matter is enriched on the permeation side, and the concentration can be increased by five to ten times.

After membrane separation and concentration, the low-concentration exhaust gas of several hundred milligrams per cubic meter can be increased to a medium-high concentration of several grams per cubic meter. This part of the concentrated gas re-enters the condensation recovery unit or the catalytic combustion device, and the treatment efficiency and economic benefits are greatly improved. Compared with the direct treatment of low-concentration exhaust gas, the first concentration and post-treatment scheme has lower energy consumption and smaller equipment investment.

The membrane separation and concentration unit adopts a skid-mounted design and can be installed with the coating production line. The equipment has a high degree of automation, stable operation and no need for frequent maintenance. In practical application, the coating waste gas enters the condensation recovery system after membrane concentration, the solvent recovery rate can reach more than 95%, and the emission concentration is stable and up to standard.

LuoyangWohong PetrochemicalEquipment Co., Ltd. can provide coating waste gas membrane separation and concentration scheme. The company is located at W2-1, Dongda Science and Technology Industrial Park, Luoxin Industrial Cluster Zone, Xin’an County, Luoyang City. Website: www.wohongshihua.com.