A Technique and Apparatus for Recycling Volatile Organic Compounds of Coating Printing

摘要

The present invention discloses an integrated new technique and apparatus for recycling volatile organic compounds of coating printing. The new technique collects a mixed gas of volatile organic compounds produced in the process of coating and drying of a coating machine with a volatiles collecting hood of coating machine, compresses and lead the mixed gas of volatile organic compounds into a condensation system for condensation; the obtained condensate enters a gas-liquid separator to obtain a coating solvent with high concentration; non-condensable lean gas enters a membrane separation and enrichment system to obtain a mixed gas of high concentration organic compounds after membrane separation and enrichment with a complete set of membrane assembly, and then returns to front of the condensation system to repeat the integrated technique. The separation membrane as claimed in the present invention has an extremely high permselectivity for volatile organic compounds of coating printing and can quickly enrich the volatile organic compounds. Recycling rate of volatile organic compounds of the apparatus may reach 90%, and the content of organic compounds in the tail gas emission after treatment is no more than 1 g/m3. This integrated new technique largely reduces the production cost of coating printing industry and at the same time protects the atmospheric environment.

主权项

1. A technique for recycling volatile organic compounds of coating printing industry, which is characterized by including the following steps:
(1) Collect a mixed gas of volatile organic compounds produced in the printing process of the coating machine with the volatiles collecting hood of coating machine, compress and lead the mixed gas of volatile organic compounds into the condensation system for condensation (2) Lead the condensate obtained in the above step into the gas-liquid separator to obtain a coating solvent with high concentration after an enrichment process; lead non-condensable gas into a membrane separation and enrichment system, obtain a mixed gas of organic compounds after membrane separation and enrichment with a complete set of membrane assembly, and then lead it back to the compressor through a vacuum pump for recycling.