Compression condensation membrane separation technology for ethyl acetate recovery unit in printing factory

Gravure printing is a key industry for VOCs emissions, and the diluent used in printing ink and composite processes is mainly ethyl acetate, accounting for more than 60% of the total. The concentration of exhaust gas is generally between 2500 and 4000 milligrams per cubic meter.activated charcoalAdsorption saturation is fast, carbon replacement is frequent, and the cost of disposing of saturated carbon as hazardous waste is not low;RTOThe combustion method can cost hundreds of thousands of yuan annually for gas, and the solvent is also directly burned off.

The compression condensation membrane separation technology follows the recycling route. Research in the printing industry has shown that the combination process of "condensation+membrane separation" is highly suitable for solvent recovery of dry composite waste gas. The process path is as follows: the exhaust gas is pressurized by a compressor and enters the condensing unit, gradually cooling down to liquefy most of the ethyl acetate from gas to liquid for recovery. The uncondensed exhaust gas enters the membrane separation unit, and by utilizing the difference in permeation rate between organic molecules and air molecules in the membrane material, ethyl acetate preferentially passes through to form a concentrated gas, which is sent back to the front end of the system for recycling treatment; Air emissions meet the standard. The recovery rate of volatile organic compounds in this process can reach over 90%, and the organic content in the treated exhaust gas can be controlled below 1g/m ³.

The device is powered by electricity, does not consume natural gas, has no consumables such as activated carbon, and does not generate hazardous waste. The recycled ethyl acetate can be directly reused in production, reducing raw material procurement expenses. It is recommended to complete exhaust gas testing before selecting, and match equipment specifications based on concentration and air volume. LuoyangWohong PetrochemicalThe equipment company can match the compression condensation membrane separation and recovery plan according to the specific working conditions of the printing factory, and recover the solvent while ensuring compliance.