Process for the preparation of crystalline, salt-free, chlorine-

Details Process for the preparation of crystalline, salt-free, chlorine- Process for the preparation of crystalline, salt-free, chlorine-

1994-04-06

1995-09-19

Chan, Nicky

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

Organic compounds

Sulfonic acids or salts thereof

C07C30929

Patent

active

054516994

ABSTRACT:
The present invention relates to a process for the preparation of crystalline, salt-free, chlorine-substituted 3-nitrobenzenesulfonic acid hydrates from sulfonation mixtures containing chlorine-substituted 3-nitrobenzenesulfonic acid, in which the sulfonation mixture is mixed with from 8 to 25% strength by weight aqueous sulfuric acid at from 40.degree. C. to 100.degree. C., the resulting suspension is cooled to from 5.degree. C. to 20.degree. C., the precipitate is filtered off and dissolved with water at from 30.degree. C. to 100.degree. C., filtration is carried out if desired, the solution is cooled to from 5.degree. to 40.degree. C. and filtered, and the sulfuric acid-containing filtrate is recycled if desired.

REFERENCES:
patent: 4242275 (1980-12-01), Arndt et al.

Affiliated with

Also associated with

Rating

Process for the preparation of crystalline, salt-free, chlorine- does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of crystalline, salt-free, chlorine-, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of crystalline, salt-free, chlorine- will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1829369