A method for improved recovery of gasoline - and / or solvent vapors with pressure in the condensation and / or pressure absorption for exhaust air purification plants which operate

摘要

Improve the recovery of gasoline and/or solvent vapours in plants working by pressure condensation or pressure absorption for air purificn., comprises compressing the waste air contg. gasoline and/or solvent vapour; and condensing or absorbing with a suitable washing medium whilst maintaining pressure ratios. A part of the vapour in the waste air is recovered in liq. form from the air. The air cleaned in this way, contg. a residual amt. of vapour, is fed under pressure to another suitable cleaning stage, where more vapours are removed. If necessary, the air is further fine cleaned before being vented to the atmos., whilst the recovered materials are fed to a storage tank. The pressurised washing medium removed from the condensation or absorption unit with a fitting, which contains the condensed or washed vapours and is air satd., is fed to a pressure relief device through a pipe. The mixt. of released air and liq. wash medium contg. the recovered materials which leaves the relief device is fed to a gas separator, where the air contg. some vapours is sepd. from the wash medium soln., and is passed through a fitting through a pipe to either the raw gas inlet or gas storage before the compressor. The wash medium soln. is meanwhile fed to the storage tank by a pipe.