In the process of fine chemical production, synthesis reaction, distillation operation, vacuum desolvation, material transfer, storage tank storage and other processes will continue to produce a large amount of volatile exhaust gas, the exhaust gas is rich in ethyl acetate, dichloromethane, acetone, methanol and other high-value organic solvents. Most of these volatile exhaust gases are unorganized or semi-organized, with large fluctuations in gas concentration, mist droplets and corrosive media entrained in some air streams, and complex exhaust emission conditions. If the control means are not properly selected, on the one hand, a large number of solvent materials will be lost without reason, which will increase the purchase cost of raw materials for enterprises. On the other hand, the unorganized diffusion of waste gas will also bring potential safety hazards to the workshop, which is difficult to meet the requirements of environmental protection control.
Traditionwaste gas treatmentThere are many short boards in the way of dealing with volatile exhaust. The incineration process directly incinerates the recyclable solvent completely, resulting in a prominent waste of resources. The combustion of waste gas containing halogenated components will also generate corrosive by-products, and the energy consumption of the equipment and the investment in later operation and maintenance remain high.activated charcoalAdsorption is only a means of pollutant transfer, can not achieve solvent recycling, fluctuating impact of the exhaust gas is likely to cause adsorption material consolidation saturation, there is a safety hazard of heat accumulation fire, the operation process continues to produce dangerous solid waste, disposal costs continue to increase. The single condensation process is limited by the partial pressure of organic vapor, and the solvent recovery efficiency is unstable in the face of volatile tail gas with fluctuating concentration, so it is difficult to achieve all-weather stable treatment.
Fine chemical volatile exhaust gas liquefaction recovery solvent recycling unit adopts compression-condensation-film coupling full physical process, the whole process does not burn, no chemical reaction intervention, will not produce secondary pollution. The volatile exhaust gas collected in the production process is transported through a closed pipeline and enters the buffer pressure stabilizing unit to stabilize the pulse fluctuation of gas volume and pressure, ensure the stability of the working condition entering the main engine, and reduce the impact damage of the fluctuating airflow on the whole set of equipment.
The tail gas enters the multi-stage pretreatment unit to remove solvent droplets, aerosol impurities and free moisture carried by the air stream, forming effective protection for core precision components such as compressors, heat exchangers and membrane modules, reducing the probability of corrosion, scaling and blockage failures, and extending the operating life of the entire unit. After purification and pretreatment, the exhaust gas completes compression and pressurization, increases the organic vapor partial pressure, optimizes the solvent liquefaction phase change conditions, and then sends it to the multi-stage gradient condensation unit, relying on the difference of the boiling point of various solvents to cool down, most of the organic components complete liquefaction and precipitation, to achieve the initial recovery of solvent.
The low-concentration tail gas remaining after condensation treatment is delivered to the membrane separation module, and the organic component enrichment is completed by relying on the permeability selectivity of the polymer membrane material. The purified tail gas meets the emission standard, and the concentrated high-concentration organic gas flow is returned to the front end of the equipment for recycling treatment, further improving the comprehensive recovery efficiency of the mixed solvent. The recovered liquid solvent is separated into water, filtered and purified, and the indicators meet the production and use conditions, which can be returned to the production process for recycling, effectively reducing the amount of solvent purchased by enterprises, reducing the output of hazardous waste, and simultaneously completing the waste gas treatment and solvent resource recycling cycle.
The unit can adopt a skid-mounted integrated structure. The assembly, pressure detection and explosion-proof calibration are completed in the factory, and the whole machine is delivered from the factory. The site only needs to connect the tail gas collection pipeline, the construction workload is small, the transformation period is short, and the interference to the normal production of the workshop is small. It is not only suitable for new projects, but also can be used for the upgrading and transformation of volatile tail gas treatment in the old factory area. The equipment shall be designed and selected in strict accordance with Class A explosion-proof specifications of chemical industry. All electrical components shall meet the explosion-proof requirements. The components in contact with the medium shall be made of suitable anti-corrosion materials. The system is equipped with over-temperature, over-pressure, combustible gas detection interlock protection and emergency venting bypass to deal with all kinds of sudden abnormal conditions and avoid safety production risks. Equipped with intelligent frequency conversion automatic control system, it can follow the dynamic changes of exhaust air volume and concentration to adaptively adjust the operating load, control the operating energy consumption, and support long-term unattended operation. Customized configuration can be made according to on-site volatile tail gas components, air volume and site conditions, and is widely suitable for various fine chemical volatile tail gas solvent recycling projects.
Mr. Li 13526990215
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