Fine chemical mixed solvent waste gas membrane separation treatment equipment, actual project supplier Luoyang Wo Hong Petrochemical.

In the process of fine chemical production, synthesis, distillation, extraction, vacuum devolatilization, material transfer and other processes will continue to produce a large number of multi-component mixed solvent VOCs waste gas, the waste gas system is complex, usually coexisting alcohols, ketones, esters, aromatic hydrocarbons, halogenated alkanes and other organic solvents. Because the fine chemical industry is mostly batch production, the exhaust gas emission is extremely unstable, the air volume is large and small, and the concentration fluctuation range is extremely large. In the production process, the exhaust gas is easy to carry fine material particles, condensation droplets and saturated water vapor, which is not only easy to cause equipment blockage and heat exchange failure, but also forms acidic medium after some halogenated solvents are hydrolyzed with water, causing corrosion to the equipment. At the same time, the organic waste gas is flammable and explosive as a whole, with complex working conditions and many risk points, which puts forward extremely high requirements for the stability, adaptability and safety of the treatment process. The traditional treatment methods have been difficult to meet the needs of enterprise resource management and stability standards at this stage.

At present, the traditional treatment process commonly used in the industry has obvious defects under the complex working conditions of mixed solvents. Although the incineration process can achieve the exhaust gas standard, but a large number of organic solvents with economic value will be directly burned and destroyed, the waste of resources is serious, and the high temperature combustion of halogen-containing components will produce strong corrosive flue gas, the subsequent pipeline, equipment corrosion, supporting the exhaust gas treatment system investment is large, high operation and maintenance costs.activated charcoalThe adsorption process only belongs to the pollutant transfer treatment method, can not achieve solvent recovery, in the multi-component, high humidity, fluctuating concentration of exhaust gas environment, the adsorption material is very easy to saturate in advance, the occurrence of penetration failure, the need for frequent downtime to replace consumables, resulting in a large number of hazardous waste, long-term operating costs remain high. The simple low-temperature condensation process relies on low-temperature liquefied solvents, but is obviously limited by the partial pressure of organic steam, only for high-concentration exhaust gas effect is better, in the face of fluctuating conditions and low-concentration exhaust gas recovery efficiency drops sharply, can not achieve stable and efficient resource treatment.

Compression condensation film coupling method is a pure physical treatment process, the whole process without combustion, no chemical reaction, safe and reliable, perfect fit for fine chemical mixed solvent waste gas treatment scene. The waste gas first enters the pretreatment unit, and through the multi-stage filtration and defoaming structure, the liquid mist droplets, dust impurities and free moisture in the airflow are completely removed to ensure that the back-end core equipment is not polluted and blocked. The purified waste gas enters the explosion-proof compression unit, and the partial pressure of organic vapor is increased by reasonable pressure increase to greatly improve the solvent liquefaction conditions, and then the multi-stage gradient condensation system is used to cool in layers according to the boiling point characteristics of different solvents, so that most organic components are directly liquefied and precipitated, and the preliminary solvent recovery is completed.

The residual low-concentration tail gas after condensation still contains a small amount of recoverable solvent and will be uniformly sent to the high-precision organic membrane separation unit. The use of membrane materials on the organic solvent and air selective permeability difference, to achieve efficient enrichment of solvent components, separation and purification, clean air standard discharge, high concentration of organic enrichment air flow back to the compressor front end, again into the system cycle processing. The whole process cycle closed-loop operation, to maximize the potential of solvent recovery, the recovered organic solvent after precipitation, filtration, testing, can be directly reused in the production line, the real realization of waste gas into resources, from the source to reduce the generation of hazardous waste, reduce the production cost of enterprises.

In view of the complex mixed exhaust gas conditions of fine chemical industry, the design of equipment structure and configuration needs to conform to the actual production. The equipment flow pipe, valve body and heat exchange components are all made of corrosion-resistant materials, which can effectively resist the acid corrosion of halogenated medium and ensure the long-term stable operation of the equipment. The whole machine adopts high standard explosion-proof design, complete with overpressure, overtemperature, leakage monitoring and automatic interlocking protection functions to eliminate potential safety hazards under flammable and explosive conditions. The automatic control system adopts the frequency conversion intelligent control mode, which can automatically adjust the operating load of the equipment in real time according to the change of exhaust gas air volume and concentration, adapt to the intermittent production fluctuation conditions, avoid the overload operation or inefficient idling of the equipment, and greatly reduce the energy consumption loss. The pre-pretreatment system intercepts impurities and droplets in stages, effectively protects the core precision components such as film components and heat exchangers, and prolongs the service life of the equipment. According to the differences in exhaust gas composition, concentration and air volume of different enterprises, it is necessary to customize the design process scheme in combination with the actual working condition data, so as to eliminate the problems of poor adaptability, low recovery efficiency and unstable operation of general-purpose models, and to ensure the stable compliance of VOCs exhaust gas treatment and the cost reduction and efficiency increase of solvent resource utilization.