Process for the preparation of sulfamic acid

Details Process for the preparation of sulfamic acid Process for the preparation of sulfamic acid

1982-01-29

1983-05-31

Vertiz, O. R.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

C01B 1700

Patent

active

043860605

ABSTRACT:
Processes for the production of sulfamic acid by the reaction of urea, sulfuric anhydride, and sulfuric acid in (1) a two-stage process wherein the sulfuric anhydride used in the first stage at a temperature less than 50.degree. C. is dissolved in a halogenated fluorocarbon or a mixture of halogenated fluorocarbons having a boiling point of from 0.degree. to 50.degree. C. or (2) in a one-stage process at 60.degree. to 100.degree. C. with the sulfuric anhydride dissolved in a halogenated fluorocarbon or a mixture of halogenated fluorocarbons having a boiling point below 100.degree. C. at atmospheric pressure, the halogenated fluorocarbon serving to remove the heat generated by the exothermic formation of the sulfamic acid from the original reactants.

REFERENCES:
patent: 2109952 (1938-03-01), Wyler
patent: 2408492 (1946-10-01), Tauch
patent: 2408823 (1946-10-01), Tauch
patent: 2419618 (1947-04-01), Wilson
patent: 2436658 (1948-02-01), McQuaid
patent: 2851336 (1958-09-01), Tauch
patent: 3051551 (1962-08-01), Ferlin et al.
patent: 3125415 (1964-03-01), Gilbert et al.
patent: 3127240 (1964-03-01), Gilbert et al.
patent: 3188175 (1965-06-01), Nychka
patent: 3423174 (1969-01-01), Sowerby

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