Chemical and pharmaceutical production of the reactor pressure relief, distillation, vacuum drying, vacuum pump exhaust process, often produce high concentrations of VOCs organic tail gas, waste gas which contains dichloromethane, acetone, ethyl acetate, butanone and other high-value organic solvents. This kind of exhaust gas concentration fluctuations, part of the medium after hydrolysis with chloride ion corrosion, the production site belongs to the Class A explosion-proof environment. If the selection of tail gas recovery equipment is wrong, it is easy to have substandard recovery efficiency, lack of safety protection, high operation and maintenance costs, and even raise the back pressure of the system to interfere with the negative pressure production of the reactor and vacuum pump. How to select a complete set of exhaust gas membrane separation and recovery equipment suitable for high concentration working conditions has become the focus of environmental protection and technological transformation of many fine chemical and API enterprises.
All kinds of traditional treatment processes on the market have obvious short boards in the face of chemical and pharmaceutical high-concentration exhaust gas.RTO The incineration process directly incinerates the valuable solvent at high temperature. When encountering halogenated hydrocarbon waste gas such as dichloromethane, hydrogen chloride will be generated during combustion. Improper control will also generate secondary pollutants such as dioxin. The equipment investment and fuel consumption are large. Only waste gas can be destroyed, and solvent resource recovery cannot be realized.activated charcoalAdsorption treatment of high-concentration exhaust gas, activated carbon will be saturated in a short time, not only there is a hidden danger of adsorption heat release, but also a large number of hazardous waste will be produced, and the cost of hazardous waste disposal will increase year by year. Pure single-stage condensing equipment to improve the recovery rate must open the depth of refrigeration, the energy consumption of the whole machine rose sharply, once the exhaust gas concentration fluctuations, exhaust emissions are easy to exceed the standard. Only relying on a single membrane separation equipment can only complete gas enrichment, can not produce liquid solvent, high concentration of membrane components under long-term high-load operation, fast consumption, shorten the service life.
Compression-condensation-membrane coupling complete sets of equipment are more suitable for chemical and pharmaceutical high-concentration exhaust gas recovery scenarios, the whole set is a physical recovery route, no fire high temperature operation. The high-concentration exhaust gas is first sent to the buffer pressure stabilizing unit to stabilize the air pressure, and then undergoes defoaming filtration, pre-cooling and dehydration pretreatment to filter out material droplets, solid impurities and water vapor, and protect the back-end condenser and membrane elements. Exhaust gas is compressed and pressurized to increase the partial pressure of solvent vapor, and most organic solvents are directly liquefied and collected in multi-stage gradient condensation unit. The residual tail gas that has not been condensed is sent to the special membrane module for halogenated hydrocarbon resistance for enrichment and separation. The concentrated high-concentration organic gas is recirculated to the front end of the equipment for re-treatment. The treated tail gas is stably discharged up to standard. The collected liquid solvent is sent back to the production workshop for reuse after phase separation treatment.
There are several key points that cannot be ignored in the selection of high concentration exhaust gas equipment for chemical and pharmaceutical industries. First, it is necessary to make an evaluation according to the real working condition parameters on site, including waste gas inlet concentration, actual air volume, proportion of solvent components, water content, continuous or intermittent emission. Manufacturers need to output material balance reports, calculate solvent recovery, energy consumption of the whole machine and return on investment cycle, and do not directly apply standardized general models. The second treatment of halogenated hydrocarbon waste gas containing dichloromethane must be equipped with a special membrane module resistant to halogenated hydrocarbons. Ordinary organic membranes will swell and damage rapidly when contacting halogenated hydrocarbon solvents. The third pretreatment unit cannot be deleted at will. Buffer stabilization, defoaming, filtering and pre-cooling dehydration can isolate impurity water vapor and avoid corrosion and blockage of core components. The fourth focus is on the back pressure control ability. The high concentration working condition has a large airflow load. If the equipment flow channel design is unreasonable, the front end pressure will be raised and the negative pressure conditions of the reaction kettle and vacuum pump will be destroyed. The explosion-proof grade of the fifth equipment shall be matched with Class A workshop, and safety interlock protection devices for combustible gas, overpressure and overtemperature shall be provided. The sixth priority is to choose the source manufacturer with the real landing project of high concentration tail gas of chemical and pharmaceutical industry, avoid the middlemen of parts assembly, and ensure the efficiency of spare parts supply and technical response in the later period.
LuoyangWohong PetrochemicalIt is the source supplier of complete sets of equipment for membrane separation solvent recovery. It deeply cultivates high concentration and intermittent fluctuation of waste gas in chemical and pharmaceutical industries. It has its own standardized production workshop and does not assemble simple accessories. Independent research and development of skid-mounted compression condensing film coupling recovery unit, for halogenated hydrocarbon waste gas to do material anti-corrosion upgrade, configuration of halogenated hydrocarbon special membrane components, optimize the equipment flow channel to achieve back pressure control. The explosion-proof grade ExdⅡ CT4 of the whole machine is equipped with a full set of safety interlocking and PLC frequency conversion full-automatic control system, which can automatically adjust the operating load of the equipment according to the change of exhaust gas concentration, and the comprehensive recovery rate of solvent can reach 95-98%. The whole set of equipment is skid-mounted and integrated before leaving the factory. The assembly and pressure test are completed in the factory. The project site can be put into use after docking the air duct and power supply. Almost no waste activated carbon is generated, thus reducing the long-term operation and maintenance expenses of the enterprise.
The equipment is suitable for a variety of complex 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, etc.
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 exhaust emission standards and organic solvent resource reuse.
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