Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1980-02-29
1981-07-07
Evans, Joseph E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
44 77, 568854, C07C 3124, C07B 5302, C10L 118
Patent
active
042776201
ABSTRACT:
This invention provides a process for recovery of sodium formate from an aqueous waste stream which is a byproduct mother liquor derived from a reaction system in which pentaerythritol is produced by the reaction of formaldehyde with acetaldehyde in the presence of metal hydroxide catalyst.
Among its important features, the invention process involves evaporative crystallization of the mother liquor to separate out a major proportion of metal formate; dilution of the resultant secondary aqueous waste stream with methanol to precipitate metal formate/pentaerythritol solids; contact of the solids with a portion of the primary aqueous waste stream feed to dissolve metal formate; and recycle of the metal formate-enriched aqueous stream to the evaporative crystallization step of the process.
REFERENCES:
patent: 2441602 (1948-05-01), Snow et al.
patent: 2780655 (1957-02-01), Yalowitz
patent: 2790011 (1957-04-01), Pohl et al.
patent: 2790836 (1957-04-01), Mitchell et al.
patent: 3968176 (1976-07-01), Vehama et al.
patent: 4083931 (1978-04-01), Lee
Gupton B. Frank
Ulmer Harry E.
Evans Joseph E.
Virginia Chemicals Inc.
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