Obtaining very pure maleic anhydride from crude maleic...

Details Obtaining very pure maleic anhydride from crude maleic... Obtaining very pure maleic anhydride from crude maleic...

B - Operations, Transporting

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B01D 3/32 (2006.01) C07C 51/573 (2006.01) C07D 307/60 (2006.01)

Patent

CA 1292720

- 7 - O.Z. 0050/37548 Abstract of the Disclosure: Very pure maleic anhydride having a stable color is obtained by fractional distilla- tion of crude maleic anhydride by a method in which the maleic anhydride vapor separated off from low boilers and high boilers is partially condensed so that from 0.5 to 15% by weight of the maleic anhydride vapor is separated off from the vapor phase as a liquid precondensate, and the remaining very pure maleic anhydride vapor is then completely condensed.

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