Treatment of waste stream from pentaerythritol manufacture

Details Treatment of waste stream from pentaerythritol manufacture Treatment of waste stream from pentaerythritol manufacture

1982-05-10

1986-09-16

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562609, 568853, 568854, C07C 2978, C07C 2986, C07C 3124, C07C 5143, C07C 5147, C07C 5148, C07C 5306

Patent

active

046123890

ABSTRACT:
This invention provides a process for improving the separation and recovery of metal formate and pentaerythritol as crystalline products, from an aqueous waste stream of a pentaerythritol manufacturing operation which involves the reaction of formaldehyde with acetaldehyde in the presence of a metal hydroxide catalyst.
The pentaerythritol process waste stream is passed through a macroreticular resin bed to remove organic byproducts, and the purified waste stream is then evaporatively concentrated to produce crystalline sodium formate product. The resultant mother liquor is diluted with water-miscible alkanol to precipitate a pentaerythritol-metal formate mixture. The precipitate is washed with a portion of waste stream feed to dissolve the metal formate and yield undissolved crystalline pentaerythritol as a product.
At least about 85 percent of the metal formate and at least about 90 percent of the pentaerythritol contained in the original waste stream are recovered as products of the process.

REFERENCES:
patent: 3875248 (1975-04-01), Prinz
patent: 4083931 (1978-04-01), Lee

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