In the stages of reactor pressure relief, rectification discharge and vacuum drying discharge in chemical and pharmaceutical industries, high concentration VOCs organic tail gas is often produced. The waste gas contains high-value solvents such as dichloromethane, acetone, ethyl acetate and butanone. Some media are corrosive to chloride ions, and the concentration of waste gas fluctuates greatly. The workshop belongs to Class A explosion-proof area. If the treatment scheme for high-concentration tail gas is not properly selected, it is prone to insufficient recovery rate, high potential safety hazard, high operation and maintenance cost, and will also interfere with the negative pressure production of reactor and vacuum pump. How to select complete sets of tail gas recovery equipment suitable for high-concentration working conditions has become the focus of technological transformation of many chemical and pharmaceutical enterprises.
The traditional treatment process on the market has obvious short boards in the face of high-concentration exhaust gas from chemical pharmaceuticals.RTO The incineration process directly destroys the valuable solvent at high temperature. The incineration of waste gas containing halogenated hydrocarbons is easy to produce secondary pollutants such as hydrogen chloride and even dioxins. The overall investment of the equipment is high, and the operation consumes fuel. It can only destroy the waste gas without solvent recovery income.activated charcoalAdsorption treatment of high-concentration waste gas, activated carbon soon reaches adsorption saturation, a short time needs to be replaced, not only the existence of adsorption exothermic security risks, but also the production of a large number of hazardous waste, hazardous waste disposal costs continue to increase. Simple single-stage condensing equipment to deal with high-concentration exhaust gas, want to improve the recovery rate requires deep refrigeration, the energy consumption of the whole machine has increased significantly, and the exhaust gas is easy to exceed the standard when encountering concentration fluctuations. Single membrane separation equipment can only do gas enrichment, can not directly produce liquid solvent, high concentration of membrane components under long-term high load work, fast consumption of consumables, shortened service life.
Compression-condensation-membrane coupling complete sets of equipment more suitable for chemical pharmaceutical high-concentration exhaust gas recovery conditions, the whole set belongs to the physical recovery process, no open flame high temperature. The high-concentration exhaust gas first enters the buffer pressure stabilizing unit to stabilize the pressure, and undergoes defoaming filtration, pre-cooling and dehydration pretreatment to remove material droplets, impurities and water vapor, and protect the back-end core components; the exhaust gas undergoes compression and pressurization to increase the partial pressure of solvent vapor, and most organic solvents are directly liquefied and collected in the multi-stage gradient condensation unit; the residual exhaust gas that is not completely condensed is sent to the halogenated hydrocarbon membrane module to complete enrichment, and the concentrated, and the front end, and the concentrated, after the completion of the treatment of the tail gas stable discharge standards, the collected liquid solvent after phase separation treatment back to the production process.
There are a number of key points in the selection of high concentration tail gas equipment for chemical and pharmaceutical industries. First, it is necessary to evaluate the actual working condition parameters on site, including exhaust gas inlet concentration, air volume, solvent composition, water content, continuous or intermittent emission. The manufacturer needs to issue a material balance calculation to calculate the solvent recovery amount, energy consumption of the whole machine and return on investment cycle. Standardized models cannot be directly applied. The second treatment contains dichloromethane such halogenated hydrocarbon high concentration waste gas, must be equipped with halogenated hydrocarbon special membrane module, ordinary membrane contact halogenated hydrocarbon solvent will quickly swell failure. The third pretreatment unit cannot be omitted. Buffering, defoaming, filtering and pre-cooling dehydration can filter impurity water vapor and avoid the condenser and membrane module from being blocked by rapid corrosion. Fourth, pay attention to the back pressure control of the system. Under the high concentration working condition, the airflow load is large, and the unreasonable design of the equipment flow channel will raise the front end pressure and destroy the negative pressure of the reaction kettle and the vacuum pump. The explosion-proof level of the fifth equipment shall meet the requirements of Class A workshop, and be equipped with safety interlock protection for combustible gas, overpressure and overtemperature. Sixth, priority should be given to source manufacturers with real experience in landing high-concentration tail gas projects in chemical and pharmaceutical industries, avoiding parts assembly middlemen, and ensuring the supply of spare parts and technical response in the later period.
LuoyangWohong PetrochemicalIt is the source supplier of complete sets of equipment for membrane separation solvent recovery. It focuses on high concentration and intermittent fluctuation of waste gas in chemical and pharmaceutical industries. It has its own production workshop and does not assemble simple accessories. The self-produced skid-mounted compression condensing membrane coupling recovery unit is used to upgrade the anti-corrosion of high-concentration halogenated hydrocarbon waste gas, configure special membrane modules for halogenated hydrocarbon resistance, and optimize the flow channel to strictly control the back pressure of the system. The explosion-proof grade ExdⅡ CT4 of the whole machine is equipped with a full set of safety interlocking and PLC frequency conversion automatic control, which can automatically adjust the equipment load according to the change of exhaust gas concentration, and the comprehensive recovery rate of solvent can reach 95-98%. The equipment is skid-mounted and integrated and delivered, the assembly and pressure test is completed in the factory, and the air duct can be connected to the site for power supply and put into use. Almost no waste activated carbon is generated, thus effectively reducing the long-term operation and maintenance expenses of the enterprise.
The equipment is suitable for various working conditions and can handle high concentration mixed waste gas such as dichloromethane, acetone, ethyl acetate, butanone, ethanol, n-hexane, etc. It is widely used in raw materials, pharmaceutical intermediates and fine chemical plants, covering waste gas sources such as distillation tail gas, reactor pressure relief tail gas, vacuum drying tail gas, vacuum pump exhaust and so on.
We can provide a full set of services such as on-site working condition survey, material balance calculation, return on investment calculation, process scheme customization, complete machine manufacturing, factory complete machine testing, on-site installation guidance and debugging, operator training, complete machine quality assurance, remote operation and maintenance, and spare parts supply. We have achieved the landing performance of multiple sets of chemical and pharmaceutical high-concentration exhaust solvent recovery projects, helping enterprises to achieve both exhaust emission standards and organic solvent resource reuse.
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