Molecular sieve trap for nitrogen compound detection

Details Molecular sieve trap for nitrogen compound detection Molecular sieve trap for nitrogen compound detection

1980-06-30

1981-11-17

Serwin, Ronald

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Chemiluminescent

23230PC, 55 75, 55 68, 422 78, 422 89, G01N 2164, G01N 3112

Patent

active

043011144

ABSTRACT:
A molecular sieve trap is disclosed for selective trapping of substances in a gas stream, the trap being particularly useful in systems for detecting nitrogen compounds such as N-nitrosamines or nitrogen oxides in a sample. The trap comprises a cartridge containing a packing of a granular adsorbent molecular sieve material with a carefully controlled pore size of about ten angstroms and a preference for adsorbing polar substances. The packing readily passes NO and NO.sub.2 gases in a gas stream directed through the trap while trapping and retaining larger and/or more polar molecules such as those of double-bonded carbon compounds and sulfur compounds which could otherwise interfere with subsequent measurement of the NO or NO.sub.x content of the gas stream. An N-nitroso compound detection system incorporating the molecular sieve trap is described wherein the molecular sieve trap is interposed between a pyrolyzer and a chemiluminescent NO detector to selectively trap substances in the reactor effluent. Also disclosed is a NO.sub.x detection system having a molecular sieve trap in a sample inlet line of a NO.sub.x detector.

REFERENCES:
patent: 3763877 (1973-10-01), Lieb
patent: 3856473 (1974-12-01), Dillon
patent: 3941573 (1976-03-01), Chapel
patent: 3973610 (1976-08-01), Fine
patent: 3996002 (1976-12-01), Fine
patent: 4153429 (1979-05-01), Matthews
patent: 4190424 (1980-02-01), Armond et al.
Union Carbide Brochure on Molecular Sieves, pp. 3-6, 16-18, (1978).

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