Removal of volatile acids from nmp solvent vapors with...

Details Removal of volatile acids from nmp solvent vapors with... Removal of volatile acids from nmp solvent vapors with...

C - Chemistry, Metallurgy

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G

196/68

C10G 21/20 (2006.01) C07D 207/267 (2006.01) C23F 15/00 (2006.01)

Patent

CA 1327539

ABSTRACT OF THE DISCLOSURE Volatile acids present in n-methyl pryrroli- done vapor from solvent extraction processes can be reacted with sacrificial metals such as magnesium to concentrate the acid salts into a small volume of oil/NMP. Steam stripping removes NMP from the oil/NMP mixture while simultaneously springing a portion of the light carboxylic acids from their salts, the acids going with the NMP. This condensed NMP stream con- taining the light carboxylic acids is contacted with an ion exchange resin which removes the acids from the NMP. The purified small volume of NMP is returned to the extraction process.

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