Thread Content
In industries such as pesticide chemistry, pharmaceutical chemistry, and other fine chemical sectors, some production processes involve chloroethane as a solvent. Due to their low boiling points, high saturated vapor pressures, and strong volatility, large amounts of these solvents are released during the production process, resulting in both solvent loss and environmental pollution. Economically efficient recovery and reuse of such exhaust gases can not only address the problem of exhaust gas pollution but also reduce solvent consumption; it is an essential means to achieve energy conservation, emission reduction, and compliance with environmental standards. As **environmental protection standards continue to rise, exhaust treatment equipment and facilities must also enhance their processing capacity to meet the increasingly stringent legal requirements. Case: In a chemical enterprise in Hebei, the inlet concentration of chloroethane waste gas was 3,000–5,000 mg/m³, with instantaneous values exceeding 10,000 mg/m³; treating such waste gas posed significant challenges. The use of hydrophobically modified carbon as an adsorbent enabled stable emission levels that met regulatory requirements. After pretreatment, the chloroethane-containing exhaust gas is pressurized by a fan and fed into an activated carbon adsorber, where the organic solvents are absorbed by the adsorbent, allowing the purified gas to be discharged. The adsorbent is desorbed using saturated steam. Steam enters from the top of the adsorber, passes through the adsorbent in the opposite direction, desorbs the organic substances to be absorbed, and carries them out of the adsorber into the condenser ； In the condenser, the mixture of organic substances and water vapor is condensed and flows into the separation tank; through gravity separation, the organic substances are recovered. After the adsorption bed completes desorption and is regenerated through closed-loop cooling, it switches back to the adsorption state, thus completing one operational cycle. Throughout the process, the adsorption bed operates in a continuous alternating, cyclic manner. Depending on the exhaust gas conditions, the adsorption unit can be designed with two adsorbers used in alternation, or with multiple adsorbers connected in series for multi-stage adsorption, so as to meet the requirements of exhaust gas treatment standards. Liu from Shijiazhuang Liuke Environmental Protection: 18633039032