Process for the commercial production of polyhydroxy alcohols an

Details Process for the commercial production of polyhydroxy alcohols an Process for the commercial production of polyhydroxy alcohols an

1996-09-27

1998-11-24

Rotman, Alan L.

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

Organic compounds

Oxygen containing

568854, C07C 3118

Patent

active

058410023

ABSTRACT:
An aldolisation process is disclosed for converting an aldehyde or mixture of aldehydes, such as iso-butyraldehyde and formaldehyde, to a desired polyhydroxy alcohol or glycol, such as neopentyl glycol. Aldolisation is effected in a stirred tank reactor using an alkali catalyst, such as sodium hydroxide. An aldolisation intermediate product is converted to the desired polyhydroxy alcohol or glycol by a hydrogenation or cross-Cannizzaro reaction step. The product is recovered and an aqueous catalyst-containing phase is recycled to the aldolisation zone. At least a portion of this catalyst recycle stream is purged to control the build up of cross-Cannizzaro products in the recycle stream. The purge stream is treated electrolytically to obtain an aqueous catalyst-containing solution for recycle to the aldolisation zone and an effluent stream comprising volatile organic materials and being substantially free from alkali catalyst.

REFERENCES:
patent: 4247653 (1981-01-01), Wagner
patent: 4933473 (1990-06-01), Ninomiya et al.
patent: 5434313 (1995-07-01), Harrison et al.
Eberson, L. in Organic Electrochemistry, ed. Baizer, M.M, 1973, Marcel Dekker, Inc., pp. 469-475.
Aldrich Catalogue, 1994, pp. 1093, 1411, 1414.

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