Vapor treatment facilities for petroleum storage tank cleaning

Details Vapor treatment facilities for petroleum storage tank cleaning Vapor treatment facilities for petroleum storage tank cleaning

1990-02-02

1991-05-21

Morris, Theodore

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

134 10, 134 31, 62 482, 55 62, B08B 900, B08B 500

Patent

active

050172409

ABSTRACT:
There is disclosed a method for the removal and recovery of hydrocarbons which are contained within the air/vapor mixture in bulk oil or gasoline storage tanks using fractional condensation with cryogenic cooling. The air/vapor mixture is flushed from the tank with fresh air and passed, successively, through several stages of a portable condenser train. When necessary, the first stage of the treatment comprises a caustic wash stage where the air/vapor mixture is contacted completely with a caustic solution to remove sulfur compounds. The desulfurized air/vapor mixture is then passed to the first condenser stage which condenses and removes substantially all moisture within the mixture. The de-humidified, desulfurized mixture is then passed to an intermediate stage where the heavier hydrocarbon fractions are condensed and separated and is then passed to a final condenser stage where it is cooled to a temperature of at least -100 degrees F., sufficient to condense substantially all hydrocarbon component therein. The cooling is accomplished cryogenically with direct or indirect heat exchange in each of the condenser stages, using liquid nitrogen. The treated air from the final condenser can be recycled as a source of the air to flush the bulk oil or gasoline storage tank.

REFERENCES:
patent: 3266262 (1966-08-01), Moragne
patent: 4331456 (1982-05-01), Schwartz et al.

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