During the pharmaceutical and chemical production process, processes such as reactor depressurization, vacuum desolvation, distillation tower top exhaust, and concentration crystallization continuously produce high concentration solvent exhaust gas. The exhaust gas mainly includes dichloromethane, ethyl acetate, acetone, and various alcohol ketone organic solvents. This type of exhaust gas has a high content of organic matter, with obvious pulse intermittent characteristics in emissions, high instantaneous peak concentration, and a large amount of solvent droplets and aerosols carried by the airflow. Some media have strong halogenated corrosion properties. Direct emission of high concentration solvent exhaust gas will cause a large amount of loss of pharmaceutical specific solvents, significantly increasing the cost of raw materials for enterprises; At the same time, high concentration flammable vapors are prone to accumulate in the workshop area, posing an explosion safety hazard and causing VOCs indicators to exceed the standard, which does not meet the environmental control requirements of the pharmaceutical industry.
Traditional exhaust gas treatment processes are difficult to adapt to high concentration solvent exhaust conditions in pharmaceuticals and chemicals. The incineration process involves open flames, high concentration exhaust gas incineration with large fluctuations in heat load, and direct destruction of solvents with recycling value. The combustion of halogenated components generates toxic and corrosive by-products, resulting in high equipment energy consumption and high maintenance costs in the later stage.activated charcoalThe adsorption surface will quickly reach adsorption saturation when faced with high concentration intake air, and frequent replacement of adsorption consumables will generate a large amount of hazardous solid waste. The adsorption bed layer has the risk of heat accumulation and spontaneous combustion, which can only transfer pollutants and cannot achieve solvent resource recovery. The single condensation process is limited by steam partial pressure, and the recovery effect is unstable when the tail gas concentration fluctuates significantly. The treatment of low concentration residual tail gas is not thorough, making it difficult to stably meet the treatment needs of continuous batch production in pharmaceutical workshops.
The compression condensation membrane recovery equipment adopts a fully physical process of compression condensation membrane coupling, with no combustion or chemical reaction throughout the process, and does not produce secondary pollutants. It is specially optimized for high concentration solvent exhaust conditions in the pharmaceutical industry. The high concentration exhaust gas discharged from various production sites is collected uniformly through a closed negative pressure gas collection pipeline network and sent to a large capacity buffering and stabilizing unit to buffer the pressure and air volume impact caused by instantaneous exhaust, stabilize the intake conditions of the main engine, and protect core precision components such as compressors, heat exchangers, and polymer membrane components from pulse airflow damage. The exhaust gas enters the multi-stage pretreatment module to remove solvent droplets, aerosol impurities, and free water carried by the airflow layer by layer, reducing the probability of equipment corrosion, scaling, and blockage failures, and improving the operational stability of the equipment under high solvent load conditions.
After the completion of the pre-treatment of the exhaust gas compression pressure, greatly improve the organic vapor partial pressure, the construction of high-efficiency solvent liquefaction conditions, into the multi-stage gradient condensation unit, according to the mixed solvent different boiling point range graded cooling, most of the high-concentration organic components directly liquefied precipitation, complete the main body of the solvent recovery. After condensation, the remaining low-concentration tail gas enters the polymer membrane separation unit, relying on the selective permeability of the membrane material to enrich the organic components, the purified tail gas reaches the emission target, and the concentrated high-concentration organic gas flow is returned to the front end of the equipment for recycling treatment, thus solving the problem of low-concentration tail gas recovery and further improving the comprehensive recovery efficiency of the mixed solvent. The recovered liquid solvent is treated by water separation, precision filtration and purification, and the quality reaches the reuse standard of pharmaceutical production, which can be returned to the production line for recycling, reducing the purchase amount of fresh solvent, reducing the cost of hazardous waste disposal, and taking into account the treatment of exhaust gas standards and the reduction of solvent resources.
The equipment can adopt a skid-mounted integrated structure, and the whole equipment can be delivered after the complete machine assembly, pressure test and explosion-proof calibration are completed in the factory. The site only needs to connect the tail gas pipeline and the public works interface, the construction period is short, the floor area is small, the old workshop is supported not to stop production of technical transformation, and the new pharmaceutical project is suitable for the upgrading and transformation of the original tail gas system. The whole machine is designed according to Class A explosion-proof standard of chemical industry. All motors, sensors, valves and instruments are equipped with explosion-proof configuration. Components in contact with corrosive media are made of special anti-corrosion materials. The system is equipped with over-temperature, over-pressure, combustible gas concentration interlock protection and emergency vent bypass to cope with the sudden change of working conditions caused by the impact of high-concentration exhaust gas and avoid safety risks in the workshop. The intelligent frequency conversion automatic control system can automatically adjust the operating load according to the change of exhaust gas concentration and air volume, realize energy-saving operation, and support all-weather unattended and stable operation. According to the enterprise exhaust gas composition, peak treatment air volume, workshop explosion-proof partition and site space custom process configuration, widely used in raw materials, pharmaceutical intermediates factory high concentration solvent exhaust gas recovery treatment project.
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