Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1977-10-25
1979-02-06
Vertiz, O. R.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
2602393A, C01C 1242
Patent
active
041384725
ABSTRACT:
A process for obtaining coarsely crystalline pure ammonium sulfate from reaction mixtures which have been obtained by Beckmann rearrangement of cyclohexanone-oxime with sulfuric acid or oleum, by neutralizing the mixtures with ammonia at an elevated temperature, with the addition of recycled ammonium sulfate mother liquor, the concentration being so chosen that during the neutralization no solid ammonium sulfate precipitates, separating the crude caprolactam from the ammonium sulfate solution, crystallizing ammonium sulfate by evaporating the ammonium sulfate solution under reduced pressure, separating off the crystallized ammonium sulfate and recycling the mother liquor to the neutralization stage. The neutralization is carried out at from 80.degree. to 115.degree. C. under autogenous pressure and the ammonium sulfate solution obtained after separating off the crude lactam is evaporated under a pressure of from 200 to 600 mm Hg while cooling to from 72.degree. to 101.degree. C.
REFERENCES:
patent: 3907781 (1975-09-01), De Rooij et al.
patent: 3937789 (1976-02-01), Donati et al.
Beullens Josef
Brand Uwe
Fuchs Hugo
Kartte Klaus
Neubauer Gerald
BASF - Aktiengesellschaft
Langel Wayne A.
Vertiz O. R.
LandOfFree
Process for obtaining coarsely crystalline pure ammonium sulfate 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 obtaining coarsely crystalline pure ammonium sulfate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for obtaining coarsely crystalline pure ammonium sulfate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-891568