Process for the preparation of sulfuric acid semiester ethylsulf

Details Process for the preparation of sulfuric acid semiester ethylsulf Process for the preparation of sulfuric acid semiester ethylsulf

1977-08-01

1982-06-08

Higel, Floyd D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

260147, 260148, 260150, 260162, 260163, 260194, 260195, 260197, 260198, 260199, 260200, 260201, 260202, 260203, 260204, 260208, 260458C, C07C13900, C07C13910, C07D23102, C07D23134

Patent

active

043340768

ABSTRACT:
An improved and novel process had been found for the esterification of aminophenol, amino-benzanilide and pyrazolone compounds containing a .beta.-hydroxyethylsulfonyl group, by means of sulfuric acid or sulfur trioxide which improvement is characterized by that the esterification is performed in a machine which is operating with a kneading action and effect, using per mol .beta.-hydroxyethylsulfonyl compound 1 to 2.5 times the equivalent molar amount of concentrated sulfuric acid, oleum or sulfur trioxide. This novel process has the great advantage that great amounts of sulfuric acid are saved which could charge the waste water, also in form of sodium sulfate formed after the required neutralization. Furthermore, the .beta.-sulfatoethylsulfonyl compounds formed as end-products in the esterification process are prepared by this novel process in higher yields, in a higher degree of esterification rate and in a higher purity. They are obtained in form of a powder or plastic mass from the kneading machine, which is well transportable and storable, and can advantageously used in the form of this consistency, without intermediate isolation of the pure .beta.-sulfato compound itself, directly for the preparation of azo dyestuffs which are poor of inert salts, possess a high tinctorial strength and purity.

REFERENCES:
patent: 2666788 (1954-01-01), Ebel
patent: 2912428 (1959-11-01), Gaertner et al.
patent: 3193546 (1965-07-01), Freyermuth et al.
patent: 3483182 (1969-12-01), Sugiyama et al.
patent: 3859271 (1975-01-01), Sugiyama et al.
patent: 3859324 (1975-01-01), Bloch
patent: 3956267 (1976-05-01), Sommer et al.

Affiliated with

Also associated with

Rating

Process for the preparation of sulfuric acid semiester ethylsulf 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 sulfuric acid semiester ethylsulf, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of sulfuric acid semiester ethylsulf will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-553946