Method for the preparation of meta dihydroxybenzenes

Details Method for the preparation of meta dihydroxybenzenes Method for the preparation of meta dihydroxybenzenes

1975-08-07

1977-02-22

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260621R, 260625, C07C 3704

Patent

active

040092127

ABSTRACT:
A process for the preparation of dihydroxybenzenes whereby there are obtained primarily meta isomers of the dihydroxybenzenes includes the steps of: preparing a mixture of sulfonic acid isomers by sulfonation-isomerization of an hydroxybenzene having the formula: ##STR1## in which R and R' are selected from the group consisting of hydrogen and an alkyl radical having at most 4 carbon atoms per molecule, the total carbon atoms in radicals R and R' being at most 4; subjecting the so-produced sulfonic acids to selective hydrolyzation in aqueous medium at a temperature between about 100.degree. and 150.degree. C., the monohydroxy benzene being recovered by the said selective hydrolyzation in an enriched concentration that makes it readily recoverable by recycle in the process or other separation methods, and unhydrolyzed sulfonic acid remaining in the said aqueous medium; caustically fusing the said unhydrolyzed sulfonic acid, and liberating by acidification the desired dihydroxybenzene.

REFERENCES:
patent: 2225564 (1940-12-01), Maistre
patent: 2407044 (1946-09-01), Tyrer

Affiliated with

Also associated with

Rating

Method for the preparation of meta dihydroxybenzenes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for the preparation of meta dihydroxybenzenes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the preparation of meta dihydroxybenzenes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-324065