Patent ID: 6193893
Filing Date: 2001-02-27
Classification: B01D,B01F,C02F

Abstract:
A process for stripping volatile contaminants from a liquid stream in which the contaminants are dissolved, comprising the following steps in the order recited:utilizing a gas-inducing mixer-injector having a inlet port, a tapered constricting section, a substantially cylindrical throat section, an enlarging section and an outlet port in that order, and an injector port in said throat section, said sections being so proportioned and arranged as to create a reduced pressure in said throat when said liquid supply stream flows from inlet port to outlet port, flowing said liquid supply stream through said injector, said mixer-injector drawing a stripping gas into said liquid supply stream through said injector port to form a mixed stream of liquid with it contaminant and bubbles of said stripping gas, at least some of said contaminants entering the stripping gas in said bubbles;passing said mixed stream to a centrifugal degassing separator;said degassing separator having a drain port, an inner separator chamber with a cylindrical wall and a nozzle proportioned and arranged so as to discharge said mixed stream tangentially along said cylindrical wall to create a swirling centrifugal flow from the nozzle toward the drain port, a perforated gas separator tube extending centrally in said chamber to receive said separated gas from said bubbles which separated gas has been centrifugally separated from the liquid, and a gas outlet port opening into said separator tube to receive said separated gas, said liquid remaining after separation of the gas being processed liquid;utilizing a vacuum pump at said gas outlet port, withdrawing said separated gas from said separator tube for disposition after it exits from the vacuum pump; andutilizing a booster pump connected to said drain port, said booster pump withdrawing said processed liquid from said drain port while continuously maintaining that portion of the flow path of liquid and gas which extends from the throat of the injector to the gas outlet port and to the drain port of the separator at sub-atmospheric pressure.