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US 4,376,105 AGranted
Process for producing nitrous oxide
AssigneeUbe Industries, Ltd.
InventorsHiroshi Matuda, Takamoto Nishimura, Yoshiyuki Tanaka, Yoshihiko Hatabu
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Abstract
Nitrous oxide having a high purity is produced by reacting urea, nitric acid and sulfuric acid at a temperature of 40.degree. through 100.degree. C., and isolating the resultant nitrous oxide from the reaction gas mixture, without any danger of, for example, explosion during the reaction and without using expensive catalysts and sulfamic acid.
Claims11
A process for producing nitrous oxide substantially devoid of nitrogen monoxide and nitrogen dioxide comprising
- (a) dissolving urea in sulphuric acid having a a concentration of at least 98% by weight;
- (b) adding nitric acid to the resulting solution;
- and
- (c) heating said solution to a temperature of between 40.degree. C. and 100.degree. C. to produce a nitric oxide containing mixture
1 more element
A process for producing nitrous oxide comprising the steps of:
- (a) dissolving urea in sulfuric acid having a concentration of at least 90% by weight;
- (b) adding nitric acid to the resulting solution;
- (c) heating said solution to a temperature of between 40.degree. C. and 100.degree. C. to produce a nitrous oxide containing reaction gas mixture;
- and
- (d) isolating nitrous oxide from the reaction gas mixture by washing the reaction gas mixture with an aqueous alkaline solution.
2 more elements
Dependencies are inferred from the claim text.