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US 5,634,962 AGranted
Method for removing hazardous gases from enclosed structures
AssigneeServ-Tech, In.
InventorsTimothy W. Trahan, Robert R. Cradeur, Nishanath K. Mehta
Life of this patent
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Abstract
A method for removing hazardous gases having water solubility from storage tanks by scrubbing steps is described. Additionally, a method for removing ethylene dichloride contamination from soil is disclosed.
Claims6
Method for capturing hazardous, gases having water solubility from containment vessels comprising the steps of:
- withdrawing hazardous gases, from the vessel;
- introducing the gases into lower regions of a scrubbing zone;
- contacting the rising gases with sufficient water in counter-current flow to capture such hazardous gases in a water stream and create a gas stream having a substantially reduced content of hazardous gas;
- recycling the gas stream to the vessel to sweep additional hazardous gases from the vessel;
- withdrawing the water stream and dissolved hazardous gases from the scrubbing zone;
- diluting the water stream with additional water to create a recycle stream having a lowered concentration of absorbed hazardous gases and a bottoms stream;
- returning the recycle stream to the scrubbing zone;
- and
- removing the absorbed hazardous gas from the bottoms stream for disposal.
6 more elements
Method for removing ethylene dichloride from contaminated soil contained in a closed vessel which comprises the steps of:
- by mixing the contaminated soil with water forming a slurry;
- agitating the slurry to free ethylene dichloride from the soil and form a contaminated atmosphere in the vessel;
- withdrawing the vessel atmosphere contaminated with ethylene dichloride from the vessel such that the pressure within the vessel is below atmospheric pressure and the withdrawn atmosphere forms a gas stream at a greater than atmospheric pressure;
- discharging the gas stream contaminated with ethylene dichloride into a scrubbing zone;
- contacting the gas stream with a sufficient amount of stream water in the scrubbing zone in counter-current flow to absorb the ethylene dichloride into the water and create a vapor stream having a substantially lowered ethylene dichloride content;
- returning the vapor stream having lowered ethylene dichloride content from the scrubbing zone to the vessel to sweep additional ethylene dichloride from the atmosphere of the vessel.
3 more elements
Dependencies are inferred from the claim text.