초록 ▼

A process for and a system of removing volatile vapor solvents, particularly from paint-spray booths and paint dryers, and recovering such solvents, which process comprises: intimately contacting the solvent-laden air with a multiphase scrubbing media, particularly a water stream containing an oil-i

A process for and a system of removing volatile vapor solvents, particularly from paint-spray booths and paint dryers, and recovering such solvents, which process comprises: intimately contacting the solvent-laden air with a multiphase scrubbing media, particularly a water stream containing an oil-in-water emulsion or a surfactant or a powdered activated carbon, to capture and to dissolve the solvent vapor in the dispersed phase of the scrubbing media in a gas scrubber; removing the solvent-enriched scrubbing media and concentrating the solvent-enriched scrubbing media employing an ultrafiltration device; stripping the solvent from the concentrated solvent-enriched scrubbing media from the ultrafiltration device to remove and recover the solvent, while recycling the scrubbing media for further contact with fresh solvent-laden air; and recycling the water carrier as a permeate for reuse in contacting the solvent-laden air.

대표청구항 ▼

A process for the removal of a volatile organic solvent from a solvent-laden air stream, which process comprises: (a) intimately contacting and scrubbing the solvent-laden air stream with an aqueous, multiple-phase scrubbing media to provide a solvent-lean air stream and a solvent-rich scrubbing med

A process for the removal of a volatile organic solvent from a solvent-laden air stream, which process comprises: (a) intimately contacting and scrubbing the solvent-laden air stream with an aqueous, multiple-phase scrubbing media to provide a solvent-lean air stream and a solvent-rich scrubbing media, the scrubbing media comprising a surfactant-dispersed, activated carbon or molecular-sieve particles, which particles adsorb the solvent from the solvent-lean air stream, to form a solvent-rich scrubbing media; (b) discharging the solvent-lean air stream; (c) concentrating the solvent-rich scrubbing media in a low-pressure ultrafiltration-membrane unit having a feed zone and a permeate zone separated by a membrane which permits the passage of water, but retards the passage of the dispersed activated carbon or molecular-sieve particles of the scrubbing media, to provide a concentrated, solvent-rich scrubbing media in the feed zone and permeate water which passes through the membrane into the permeate zone; (d) heating the concentrated, solvent-rich scrubbing media to a temperature to remove the solvent from the activated carbon or molecular-sieve particles of the concentrated, solvent-rich scrubbing media, to form a solvent vapor and a concentrated, solvent-lean scrubbing media; (e) recovering the solvent vapor; and (f) continuously recycling the concentrated, solvent-lean scrubbing media and the permeate water from the permeate zone for use in the contacting and scrubbing of the solvent-lean air stream, to reconstitute a scrubbing media for use in the contacting and scrubbing steps, whereby the volatile organic solvent is condensed, a solvent-lean air stream is discharged and the multiple-phase scrubbing media is continuously recycled and reused in removing the solvent from the solvent-laden air stream.