Process for producing a polyol

Details Process for producing a polyol Process for producing a polyol

2006-08-08

2006-08-08

Price, Elvis O. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S853000

Reexamination Certificate

active

07087800

ABSTRACT:
A process for producing a polyol by reacting an aliphatic aldehyde with formaldehyde in the presence of a basic catalyst, which comprises a step of concentration which comprises removing water and unreacted formaldehyde from a reaction liquid by distillation; a step of extraction which comprises extracting the polyol from a concentrated reaction liquid with an extracting reagent; a step of washing with water which comprises washing an extract liquid with water and separating the liquid into an oil layer containing the polyol and an aqueous layer; wherein by useing an specific aliphatic aldehyde as the extracting agent and recovering the extracting reagent from the oil layer containing the polyol after adjusting pH of the oil layer, a high purity polyhydric alcohol can be obtained at a high yield with suppressed formation of byproducts such as acetal compounds and aldol compounds.

REFERENCES:
patent: 3956406 (1976-05-01), Palmer et al.
patent: 5948943 (1999-09-01), Supplee et al.
patent: 0 708 073 (1996-04-01), None
patent: 61-93133 (1986-05-01), None

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