pharmaceutical dichloromethane membrane condensation recovery

The principle of this process is to exploit the differences in permeation rates between dichloromethane gas and common gases such as nitrogen through a polymeric separation membrane, thereby achieving selective separation and enabling the enrichment and recovery of organic solvents. High-concentration organic matter is recovered by condensation method, which reduces energy consumption by 60% and solvent recovery rate by more than 95% compared with traditional cryogenic technology. Low-concentration organic matter is treated by adsorption, and finally meets the discharge standard.

The typical process adopts the combination of "compression shallow cooling-membrane-adsorption. The waste gas is first compressed and shallow condensed, and most of the dichloromethane is directly liquefied and recovered; the uncondensed tail gas enters the membrane module, and the organic matter preferentially passes through to form concentrated gas, which is sent back to the front end of the system for recycling treatment; the low-concentration tail gas is finally checked by the adsorption unit and discharged up to the standard. Taking 1000 cubic meters of dichloromethane waste gas per hour and a concentration of 20% to 30% in the cephalosporin workshop as an example, the emission concentration after treatment can be stably controlled below 45 mg per cubic meter, and the annual economic benefit of solvent recovery can reach more than 230 million yuan.

In terms of safety, membrane separation is purely physical separation, does not involve combustion, and avoids dioxin generation from the source. The equipment is designed without open flame, and the electrical part is configured according to explosion-proof standards, and equipped with safety interlocking functions such as pressure monitoring and over-temperature protection. Noneactivated charcoalConsumables, do not produce hazardous waste, daily maintenance to clean up the heat exchanger and check the membrane module pressure difference. The recovered dichloromethane can be directly reused in production, thereby reducing raw material procurement costs. LuoyangWohong PetrochemicalEquipment Co., Ltd. can match the recovery plan according to the specific working conditions of the pharmaceutical factory. Before selection, it can arrange working condition detection and speak with data.