During the production process of fine chemicals and pharmaceutical synthesis, a mixture of n-hexane, toluene, and ether often produces VOCs waste gas. Hexane and ether have low flash points and are flammable and explosive. Toluene is a toxic aromatic hydrocarbon substance. After mixing multiple components, the risk of explosion needs to be carefully controlled. Many production sites still have intermittent exhaust and concentration fluctuations, which pose certain difficulties for waste gas recovery and treatment.
All types of governance processes have their own applicable boundaries. Incineration treatment can achieve exhaust gas purification, but it will directly consume solvents with recycling value. When dealing with mixed flammable components, high requirements are placed on system safety control. ordinaryactivated charcoalAdsorption is a means of transferring pollutants and generates hazardous waste during operation, requiring regular replacement of adsorption consumables; Low flash point substances such as ether and n-hexane also pose a safety hazard of local overheating in the adsorption bed. The simple condensation process is constrained by the partial pressure of steam, and when the concentration of exhaust gas is low, the solvent recovery effect will decrease. According to the HJ 2026-2013 Technical Specification for Industrial Organic Waste Gas Treatment by Adsorption Method, when the waste gas has recycling value, resource-based recycling processes can be evaluated. This type of exhaust gas is flammable and explosive, and the material selection, electrical explosion-proof, and various safety interlock devices of the equipment in the production area must comply with relevant regulatory requirements.
Compression condensation membrane coupling belongs to a pure physical recovery process, with no combustion or chemical reactions in the entire process. The exhaust gas is first subjected to filtration and foam removal pretreatment to remove liquid droplets and impurities in the airflow, and then the organic vapor partial pressure is increased by an explosion-proof compression unit. After gas-liquid separation, it enters a multi-stage gradient condensation unit, and most of the organic components are liquefied and collected in a recovery tank. The uncondensed non condensable gas enters the organic membrane separation unit, and the organic components are selectively enriched. The enriched high concentration gas flow is refluxed to the compressor inlet for recycling treatment, and the treated exhaust gas is discharged outward. The recovery performance of the entire device will be affected by multiple factors such as exhaust gas inlet concentration, component distribution ratio, temperature conditions, pretreatment effect, and daily operation and maintenance. The mixed solvent obtained from recycling needs to undergo laboratory testing and meet the production and usage conditions before it can be considered for reuse in the production process.
LuoyangWohong PetrochemicalEquipment Co., Ltd. is a physical manufacturer capable of undertaking complete sets of equipment for the recovery of multi-component exhaust gases such as n-hexane, toluene, and ether. The factory is located in W2-1, Dongda Science and Technology Park, Luoxin Industrial Agglomeration Zone, Xin'an County, Luoyang City. We support customers' on-site visits and inspections, have equipment research and development, production, and complete set integration capabilities, and can undertake domestic projects as well as foreign trade export related orders.
The manufacturer will carry out customized process design based on the composition of the customer's on-site exhaust gas, flammable and explosive characteristics, and concentration fluctuations. Based on the characteristics of the medium, suitable stainless steel materials can be selected as needed for overcurrent components that come into contact with exhaust gas, reducing equipment losses caused by the medium. The equipment adopts a modular integration mode, which completes prefabrication, assembly, and debugging inside the factory. After arriving at the project site, it can be connected to the air ducts, power supply, and storage tank pipelines for trial operation, reducing the construction workload on site. The equipment is equipped with a PLC automatic control system, which can perform frequency conversion regulation according to the exhaust gas load, and effectively control the energy consumption of the equipment; The whole machine can be equipped with ExdIIBT4 explosion-proof accessories, which are matched with safety functions such as pressure overload protection, anti icing interlock, leakage detection alarm, etc., and are suitable for use in chemical and pharmaceutical explosion-proof areas.
Compared with the simple adsorption process, the physical recovery process can reduce the amount of hazardous waste generated. The actual service life of membrane modules is affected by the impurity content of exhaust gas, medium characteristics and operation and maintenance management level, and stable operation can be maintained under standardized maintenance conditions. The air volume of the equipment can be customized according to the actual needs of the project within 50-5000m/h. The manufacturer needs the customer to provide the measured parameters of exhaust gas air volume, composition, concentration, temperature, etc., evaluate the feasibility of the process, and output the process plan of the adaptation project. Can provide technical manuals, instructions and troubleshooting materials in Chinese and English versions, support export packaging, OEM matching, and supply overseas B2B projects. Enterprises in the pharmaceutical, fine chemical multi-component solvent recovery projects have accumulated implementation experience, for customers as a project reference.
There are several key points to pay attention to during the enterprise selection stage. Confirm the material grade of the equipment body and sealing components based on the flammable and explosive properties of n-hexane, toluene, and ether; Explosion proof working conditions require verifying the explosion-proof configuration of the entire machine, confirming that safety interlocking components such as pressure, temperature, and leakage are complete and usable; Pre treatment of exhaust gas front-end filtration and foam removal cannot be omitted. Droplets and impurities entering the heat exchanger and membrane components can cause component blockage and shorten their service life. In the early stage of the project, try to provide measured parameters of exhaust gas to facilitate the manufacturer's evaluation of process adaptability.
In the face of mixed waste gases such as n-hexane, toluene, and ether, in addition to traditional disposal pathways such as incineration and activated carbon adsorption, enterprises can include compression condensation membrane coupled recovery equipment in the evaluation scope, combined with their own waste gas conditions, safety control requirements, and project budget comprehensive comparison, taking into account the requirements for exhaust emissions and solvent resource utilization. Luoyang Wohong Petrochemical Equipment Co., Ltd. can provide a complete set of services including working condition evaluation, process scheme design, equipment manufacturing, dismantling and delivery, and after-sales operation and maintenance. It is suitable for domestic and foreign trade projects, and the actual operating effect of the equipment is subject to the on-site working conditions, installation and commissioning, and later operation and maintenance of the project.
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