Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-05-16
1981-08-25
Serwin, Ronald
Chemistry: physical processes
Physical processes
Crystallization
23232R, 23232C, 422 78, 422 80, G01N 3318, G01N 2718, G01N 3110, G01N 3112
Patent
active
042856990
ABSTRACT:
An analytical method for the determination of total nitrogen contents in samples, which comprises passing an inert gas stream containing substantially no nitrogen through a first reaction tube which is packed with a decomposition catalyst and oxidizing agent and maintained at a temperature of 700.degree. to 1100.degree. C., a condenser for condensing unnecessary components in the gaseous products from the first reaction tube, a second reaction tube which is packed with an oxidizing agent and a reducing agent and is maintained at a temperature of 400.degree. to 800.degree. C., a moisture-absorbing tube and a carbon dioxide gas-absorbing tube in this order, introducing a liquid sample to be analyzed into the first reaction tube and sending nitrogen gas coming out of the carbon dioxide gas-absorbing tube to a nitrogen gas analyzer to determine the nitrogen gas, and an apparatus for carrying out such a method.
REFERENCES:
patent: 3304159 (1967-02-01), Hinsvark
patent: 4066402 (1978-01-01), Komiyama et al.
patent: 4070155 (1978-01-01), Fraim
patent: 4095949 (1978-06-01), Flett
Serwin Ronald
Sumitomo Chemical Company Limited
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