Rhodia Limited

Albert Yi Yang

Philip Dean Hill

Forrest Lee Sanders

Thomas Edwin Pruitt

Richard Wai-Chun Liu

A method for purifying a spent acid catalyst from an acid catalyzed chemical reaction that generates a mixture of a product, spent add and tar, includes the steps of separating the mixture of product, spent acid, and tar into a product fraction and a spent acid fraction, said spent acid fraction comprising a mixture of spent acid and tar, and separating the spent acid fraction, by flotation separation, centrifugation, or liquid-liquid coalescence, into a tar fraction and a de-tarred spent acid fraction. The fluidized tar and the de-tarred spent acid can each be further processed to produce concentrated acid.

Method for purifying spent acid

There is a process for removing by-product tar during the manufacture of isopropyl alcohol. The process comprises the following: a) reacting propylene with concentrated sulfuric acid and water to form isopropyl alcohol and a spent acid having a by-product tar; b) capturing at least a portion of the isopropyl alcohol; c) contacting the spent acid with a gas in bubble form; d) allowing a least a portion of the tar to separate from the remainder of the spent acid to form a layer of tar and a layer of cleaned acid solution; e) capturing the tar; and h) recycling the cleaned acid solution to step a) as a source of sulfuric acid. There is also a process for removing by-product tar during the manufacture of methyl ethyl ketone. The process is substantially the same except that 1-butene is substituted for propylene. There is also a process for removing tar from a spent acid.

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Houston, TX, United States of America

Albert Yi Yang