In the process of pharmaceutical and chemical production, VOCs tail gas will continue to be produced in the processes of API synthesis, reactor pressure relief, distillation separation, vacuum desolvation, crystallization centrifugation, material transfer, tank respiration, etc. The waste gas components include dichloromethane, ethyl acetate, acetone, and various alcohol ketone organic solvents. Most of the tail gas in the pharmaceutical industry is intermittent pulse emission, batch production causes large fluctuations in air volume and concentration, air flow entrainment solvent droplets and aerosols, and some media are halogenated corrosive. Exhaust unorganized emissions not only cause high-value solvent volatilization loss, increase the cost of raw materials, the accumulation of combustible gas in the workshop will also bring explosion safety hazards, and can not meet the pharmaceutical industry's strict VOCs emission control standards.
There are many limitations in the traditional tail gas treatment scheme under the condition of pharmaceutical and chemical industry. The incineration process directly burns the recyclable solvent, the waste of resources is prominent, the combustion of halogen-containing medium will produce corrosive toxic by-products, the equipment energy consumption is high, and the later operation and maintenance investment is large.activated charcoalAdsorption only realizes the transfer of pollutants, and organic solvents cannot be recovered. Pulse exhaust gas impact can easily cause rapid saturation and consolidation of adsorption materials, resulting in the risk of spontaneous combustion of heat accumulation, continuous operation, and frequent replacement of consumables. The single condensation process is limited by the steam partial pressure, the recovery effect is unstable when the tail gas concentration fluctuates, the low concentration tail gas treatment is not up to standard, and it is difficult to adapt to the working conditions of pharmaceutical multi-batch production.
The organic solvent skid-mounted recovery unit adopts the compression-condensation-membrane coupling full physical process, with no open flame, no chemical reaction and no secondary pollutants, and is specially designed for the recovery of pharmaceutical and chemical exhaust gas. VOCs tail gas at each stain production point is collected centrally through a closed negative pressure pipe network and sent to a buffer pressure stabilizing unit to stabilize the pressure and gas volume impact caused by batch production, stabilize the air intake condition of the main engine, and protect core precision components such as compressors, heat exchangers and membrane components. The tail gas enters the multi-stage pretreatment module to remove the solvent droplets, aerosols and free moisture carried by the air stream, reduce corrosion, scaling and clogging, and ensure the long-term stable operation of the equipment.
The pre-treated tail gas is compressed and pressurized to increase the partial pressure of organic vapor, set up the solvent liquefaction conditions, enter the multi-stage gradient condensation unit, according to the boiling point of different solvents to reduce the temperature, most of the organic components are liquefied and separated, and the main body of the solvent is recovered. After condensation, the residual low-concentration tail gas enters the polymer membrane separation unit, relying on the selective permeability characteristics of the membrane material to enrich the organic components, purify the tail gas to meet the emission standards, and the concentrated high-concentration oil and gas reflux equipment front-end cycle treatment, further improving the comprehensive 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 standard. It can be sent back to the pharmaceutical production line for recycling, reducing the purchase of fresh solvent, reducing the amount of hazardous waste generated, and realizing the dual goals of tail gas treatment and material cost reduction.
The whole unit is integrated on the skid-mounted base, and the whole unit leaves the factory after the pipeline assembly, pressure test and explosion-proof debugging are completed. The site only needs to connect the tail gas pipeline with the public works interface, the installation period is short, the construction area is small, support the old factory area does not stop production technical transformation, adapt to the new pharmaceutical project supporting and the original tail gas system upgrade. The whole machine is designed in accordance with Class A chemical explosion-proof standard, all electrical instruments are explosion-proof models, and 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 venting bypass to deal with sudden changes in production conditions and avoid on-site safety risks. The intelligent frequency conversion automatic control system can automatically adjust the operating load according to the exhaust air volume and concentration, save energy and reduce consumption, and support 24-hour unattended and stable operation. The process layout can be customized according to the tail gas components of pharmaceutical enterprises, peak treatment air volume and workshop site conditions, and is widely used in pharmaceutical and chemical VOCs tail gas solvent recovery and treatment projects such as raw materials and pharmaceutical intermediates.
Mr. Li 13526990215
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