Detection of hydrazine compounds in gaseous samples by their conversion to nitric oxide-yielding derivatives

Patent · Tue Oct 04 04:00:00 EDT 1988

OSTI ID:6668229

Rounbehler, D P

This patent describes a method of detecting the presence of hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in a gaseous sample, essentially in real time. The method consists of the steps of: (a) contacting a gaseous sample with aldehyde or ketone vapors to convert hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in the sample to hydrazine derivatives; (b) heating the sample in the presence of an oxidant to decompose derivatives produced in steps (a) to produce nitric oxide gas; and (c) determining the amount of nitric oxide gas produced in step (b), wherein any nitric oxide gas determined is indicative of the presence of hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in the gaseous sample.

• Assignee: Thermedics Inc., Woburn, MA
• Patent Number(s): US 4775633
• OSTI ID: 6668229
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AIR POLLUTION MONITORING
ALDEHYDES
ALKYL RADICALS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DERIVATIZATION
DETECTION
FLUIDS
GASEOUS WASTES
GASES
GASIFICATION
HEATING
HYDRAZINE
KETONES
METHYL RADICALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
THERMOCHEMICAL PROCESSES
VAPORS
WASTES