Shell Oil Comapny

Robert Frank Dee

Marinus Van Zwienen

Raymond Lawrence June

Johan Hendrik De Bie

A process for treating waste water from an industrial process for producing propylene oxide, which process involves the steps of: (a) subjecting the waste water to a multi-effect evaporation treatment resulting in a vaporous top fraction and a liquid bottom fraction containing the non-volatile contaminants; and (b) condensing at least part of the vaporous top fraction into a liquid stream which is subject to a stripping treatment resulting in an overhead stream containing volatile waste organic material and purified water as the liquid bottom stream.

Process for the purification of industrial waste water from a propylene oxide production process

A process for treating waste water streams containing at least hydrocarbons and salts to yield a clean water product, a concentrated brine product and a hydrocarbon-rich product, which process includes the steps of: (a) feeding the waste water feed into a first distillation column at a stage in the range of from 0.05 to 0.15 from the top, wherein n represents the total number of theoretical stages of the first distillation column and has a value in the range of from 20 to 40; (b) drawing off a vapor stream at a stage in the range of from 0.55 to 0.75 from the top and feeding this vapor stream into the bottom of a second distillation column having m theoretical stages, with m having a value in the range of from 3 to 10; (c) drawing off the clean water product as the top fraction from the second distillation column and drawing off a bottom stream from the second distillation column, which is fed back into the first distillation column below the draw off of the vapor stream in step (b) at a stage in the range of from 0.60 to 0.85 from the top; (d) drawing off the concentrated brine product as the bottom fraction of the first distillation column; and (e) drawing off the hydrocarbon stream as the top fraction of the first distillation column.

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Amsterdam, Netherlands

Robert Frank Dee