pharmaceutical halogenated hydrocarbon membrane condensation recovery

pharmaceutical halogenated hydrocarbon membrane condensation recovery

The pharmaceutical industry in the production of cephalosporins, amoxicillin and other raw materials, halogenated hydrocarbons (mainly dichloromethane) as extraction and crystallization solvents are widely used. This kind of solvent has low boiling point and strong volatility, and belongs to the VOCs component of key control. According to the characteristics of halogen-containing waste gas, the membrane condensation recovery process provides a mature technical route.

Process Principle

The process adopts the "compression shallow cooling-film-adsorption" coupling method. The off-gas is first compressed and shallow condensed to liquefy most of the dichloromethane for recovery. Methylene chloride has a boiling point of about 40°C and is effectively liquefied under compression condensation conditions.gas separation membraneThe residual organics in the condensed tail gas were selectively enriched by using the difference in permeation rates between organic molecules and air molecules in the membrane material. Organic molecules preferentially permeate through the membrane layer to form concentrated gas, which is sent back to the compressor inlet for circulation treatment; the air is trapped and discharged to the standard.

Technical advantages

Compared with the traditional cryogenic technology, the combined process can reduce the energy consumption by about 60%. Through the membrane separation unit, the total recovery rate of the solvent can reach more than 95%, and the emission concentration can be controlled at a lower level. Membrane separation is a purely physical separation, does not involve combustion, and avoids by-products such as dioxins that may be produced from the incineration of halogen-containing waste gas from the source. The equipment runs without open flame and has good applicability in pharmaceutical explosion-proof workshop.

Project implementation

The recovered dichloromethane can be directly reused in the production line, reducing the cost of raw materials procurement. Equipment Noneactivated charcoalConsumables do not generate hazardous waste; routine maintenance primarily involves cleaning the heat exchanger and monitoring the pressure differential across the membrane module. LuoyangWohong PetrochemicalEquipment Co., Ltd. can match the recovery plan according to the specific exhaust gas working conditions of the pharmaceutical factory. Before selection, it can arrange working condition detection and speak with data.