|5209828||System for concentrating a spent caustic stream|
A system and method of concentrating spent caustic at a refinery has a multi-stage flash drum for separating a spent caustic stream into an overhead output stream including vaporized water and volatile organic compounds, and a concentrated spent caustic o...
|4344839||Process for separating oil from a naturally occurring mixture|
A process for separating hydrocarbons from naturally occurring mixtures comprising minerals and inorganic materials originating from rock admixed with oil, for example tar sands and oil shales. The process comprises introducing particles of such mixtures ...
|4169131||Process for recovering caustic alkali from spent alkali liquor|
A process for recovering caustic alkali from spent alkali liquor, in which a spent alkali liquor and iron oxide are roasted to obtain a product containing alkali ferrate and the product of roasting is hydrolyzed at a temperature over 110° C. and under pr...