Process for reduction of chlorinated solvent emissions
First Claim
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1. A process for the removal of chlorinated solvent vapors from a vapor vent stream containing chlorinated solvent vapor, water vapor and non-condensable vapor comprising;
- (1) contacting the vapor vent stream with a liquid spray of the chlorinated solvent precooled to a temperature less than 0°
C. under conditions such that the chlorinated solvent vapor in the vent stream condense onto droplets in the liquid spray and the water present in the vent stream condenses onto the droplets and freezes, and(2) separating the liquid chlorinated solvent, the solid water and the non-condensable vapor.
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Abstract
Chlorinated solvents are removed from vapor vent streams containing the solvent, water and non-condensable vapors by contacting the vent stream with a liquid spray of precooled chlorinated solvent at a temperature less than the freezing point of water. The solid ice floats on the liquid chlorinated solvent and can be readily separated therefrom.
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10 Claims
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1. A process for the removal of chlorinated solvent vapors from a vapor vent stream containing chlorinated solvent vapor, water vapor and non-condensable vapor comprising;
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(1) contacting the vapor vent stream with a liquid spray of the chlorinated solvent precooled to a temperature less than 0°
C. under conditions such that the chlorinated solvent vapor in the vent stream condense onto droplets in the liquid spray and the water present in the vent stream condenses onto the droplets and freezes, and(2) separating the liquid chlorinated solvent, the solid water and the non-condensable vapor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for the removal of chlorinated solvent vapors from a vapor vent stream containing a first chlorinated solvent vapor, water vapor and air comprising:
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(1) contacting the vapor vent stream with a liquid spray of a second chlorinated solvent different from the first chlorinated solvent and having a freezing point lower than that of the first chlorinated solvent, precooled to a temperature less than 0°
C. and greater than the freezing point of the mixture of the first and second chlorinated solvents, under conditions such that the chlorinated solvent vapor in the vent stream condenses onto droplets of the liquid spray and the water present in the vent stream condenses onto the droplets and freezes, and(2) separating the liquid chlorinated solvents, the solid water and the non-condensable vapor.
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Specification