Process for producing high purity formaldehyde

Details Process for producing high purity formaldehyde Process for producing high purity formaldehyde

1989-04-05

1990-10-09

Lone, Werren B.

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

Organic compounds

Oxygen containing

568492, C07C 4582

Patent

active

049622358

ABSTRACT:
A process for producing formaldehyde having high purity is disclosed, which comprises: (A) feeding crude formaldehyde containing water and methanol to the middle or lower part of a distillation column, and feeding a polyalkylene oxide compound which is inert to formaldehyde to the upper part of the column in an amount at least 10 times the total weight of the water and methanol contained in the crude formaldehyde; (B) carrying out distillation; and (C) recovering purified formaldehyde gas from the top of the column while withdrawing a solution containing the polyalkylene oxide compound, water and methanol from the bottom of the column. Using this process, formaldehyde having stable high purity can be obtained continuously through simplified steps at low cost.

REFERENCES:
patent: 2678905 (1954-05-01), Dice
patent: 2780652 (1957-02-01), Gander
patent: 2943701 (1960-07-01), Funck
patent: 3217042 (1965-11-01), Thibault
patent: 3853719 (1974-12-01), Mathias et al.

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