Process for sublimation purification of crude hydroquinone with

Details Process for sublimation purification of crude hydroquinone with Process for sublimation purification of crude hydroquinone with

1973-09-14

1976-04-27

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

23294R, 203 49, C07C 3722, C07C 3738

Patent

active

039535282

ABSTRACT:
Crude hydroquinone containing impurities is purified in a sublimation purification apparatus where the crude hydroquinone is introduced into a stirred and fluidized bed, a carrier gas which is inert to the hydroquinone is passed therethrough, and the temperature therein is kept at about 110.degree.-170.degree.C whereby crude hydroquinone is sublimed, and thereafter a mixed gas consisting of the sublimed vapor and the carrier gas is introduced into a condenser at a temperature at about 25.degree.-90.degree.C whereby the hydroquinone only is fractionally solidified. After the sublimation purification, hydroquinone of high purity can be collected.

REFERENCES:
patent: 1446551 (1923-02-01), Dissosway
patent: 1446564 (1923-02-01), Jackson
patent: 3834997 (1974-09-01), Hocking et al.
Kirk-Othmer, "Ency. of Chem. Tech.," Vol. 11, p. 483, (1967).
Perry et al., "Chemical Eng. Hand.," pp. 20-51-53, (1963).
Perry et al., "Chem. Eng. Hand.," pp. 17-23-26, (1963).

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