Process for recovering water, metal and organics from the production of polycarboxylic acid
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United States of America Patent
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Nov 29, 2016
Grant Date -
Jul 14, 2016
app pub date -
Jul 31, 2014
filing date -
Aug 14, 2013
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Abstract
In a process for recovering water, metals, soluble organics and insoluble organics from a process for the production of a polycarboxylic acid, the stream is cooled to a temperature at which dissolved organics precipitate. The precipitate organics are separated from a liquid stream and recycled to the production process. The liquid stream is then treated with an alkali to convert remaining organics to the alkali salt form and the metals present to be converted to an insoluble form. The insoluble metals are recovered from a liquid stream and this liquid stream, with the alkali salts of the organics, is passed to a membrane separation unit where it is separated into a permeate comprising water and a retentate comprising water and alkali organic salts. The permeate is recovered and recycled to the production process. The retentate also is recovered.
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