Each production process of fine chemical industry will produce a large number of organic waste gas with complex components. Volatile solvents such as dichloromethane, ethyl acetate, acetone, alcohols and ketones are continuously released at points such as distillation non-condensable gas, reactor pressure relief and exhaust, vacuum desolvation, crystallization discharge, material transfer and storage tank respiration. This kind of exhaust gas is mostly intermittent pulse emission, the working condition fluctuates greatly, the air flow entraps solvent droplets and aerosols, and some media have halogenated corrosion characteristics. Direct emission of waste gas will cause continuous loss of high-value solvents, increase the cost of raw materials for enterprises, and the accumulation of combustible steam in the plant will also form a safety hazard, while failing to meet the relevant requirements of VOCs emission control.
The traditional waste gas treatment method is difficult to realize the liquefaction recovery of organic waste gas. The incineration process directly burns the recyclable solvent, the waste of resources is prominent, the combustion of halogen-containing components will generate corrosive and harmful substances, the equipment energy consumption is high, and the operation and maintenance investment is large.activated charcoalAdsorption is only the transfer of pollutants, can not be liquefied solvent recovery and reuse, pulse exhaust gas impact is easy to cause the adsorption material rapid saturation consolidation, there is a risk of heat accumulation fire, the operation process continues to produce dangerous solid waste, consumables need to be replaced frequently. The treatment mode relying solely on condensation is restricted by steam partial pressure. When the exhaust gas concentration fluctuates, the liquefaction recovery efficiency decreases, and the low-concentration residual exhaust gas is not completely treated, which makes it difficult to meet the demand for resource management under continuous production conditions.
The membrane separation treatment device adopts a compression-condensation-membrane coupling full physical process, which has no combustion, no chemical reaction, no secondary pollutants, and realizes the liquefaction recovery of organic waste gas. The organic waste gas generated at the production point is collected centrally through the closed negative pressure pipe network and sent to the buffer pressure stabilizing unit to eliminate the pressure and gas volume pulse impact caused by intermittent exhaust, stabilize the working conditions of the main engine, and avoid the fluctuation of air flow from damaging the core components such as compressors, heat exchangers and membrane components. The exhaust gas enters the multi-stage pretreatment unit to remove solvent droplets, aerosol impurities and free moisture from the air stream, reduce the probability of equipment corrosion, scaling and blockage, and effectively extend the operating life of the equipment.
The pretreated exhaust gas is compressed and pressurized to increase the partial pressure of organic vapor, create the process conditions for solvent liquefaction, and sent to the multi-stage gradient condensation unit, which is cooled and cooled in stages according to the boiling point range of various solvents, and most organic solvents are directly liquefied and precipitated to complete the initial recovery of the solvent. The residual tail gas after condensation treatment enters the polymer membrane separation unit, and the separation and enrichment of organic components and air is realized by relying on the permeability selectivity of the membrane material. The purified tail gas meets the emission requirements, and the high-concentration organic gas stream trapped and concentrated by the membrane side flows back to the front end of the equipment to participate in compression and condensation treatment again, further improving the overall liquefaction recovery rate of the mixed solvent. The recovered liquid solvent is purified by water separation and precision filtration, and the quality meets the production reuse conditions, which can be transported back to the production process for recycling, reducing the purchase of new solvents, reducing the output of hazardous waste, and taking into account the treatment of waste gas and the utilization of solvent resources.
The equipment can adopt the form of skid-mounted integration and leave the factory directly after completing the whole machine assembly, pressure test and explosion-proof calibration in the factory. The site only needs to connect the exhaust gas pipeline and public works interface, the construction period is short, and the interference to the existing production line is small. It can be used to build a new fine chemical device and also suitable for the waste gas technological transformation project in the old factory area. The whole machine is designed and selected according to the chemical class a explosion-proof standard. all electrical instruments meet the explosion-proof specifications. components in contact with corrosive media are 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 various abnormalities caused by sudden changes in working conditions and avoid on-site safety risks. The intelligent frequency conversion automatic control system can automatically adjust the operating load of the equipment according to the change of exhaust gas air volume and concentration, reduce energy consumption, and support long-term unattended and stable operation. Customized process configuration can be made according to waste gas components, treatment air volume and site conditions, and is widely used in organic waste gas liquefaction recovery projects in pharmaceutical and fine chemical industries.
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