Odorant mixture for odorless gas fuel

摘要

#CMT# #/CMT# Composition as a strong odorant for a gas fuel, preferably natural gas comprises alkyl sulfide at 0.1-49.9 parts by weight; at least two of alkyl acrylates (II) at 50-99.8 parts by weight, where the alkyl having 1-12 carbon atoms, preferably 1-8 carbon atoms; a polymerization inhibitor compound (III) of the alkyl acrylates (II), preferably comprising a stable nitroxide radical, where the inhibitor compound is stable in both presence and absence of oxygen. #CMT# : #/CMT# Composition as a strong odorant for a gas fuel, preferably natural gas comprises alkyl sulfide at 0.1-49.9 parts by weight of formula R1-S-R2; at least two of alkyl acrylates (II) 50-99.8 parts by weight, where the alkyl having 1-12 carbon atoms, preferably 1-8 carbon atoms; an polymerization inhibitor compound (III) of alkyl acrylates (II) preferably comprising a stable nitroxide radical of formula N(R4)(R3)-O .> Either R1, R2 : 1-4C alkyl; or R1R2S : optionally saturated 3-5 membered ring (optionally substituted with 1-4C alkyl or 1-4C alkenyl); either R3, R4 : tert or sec 2-30C (preferably 4-15C) hydrocarbon radical (optionally carry S, P, N or O); or R3R4N : 4-10C (preferably 4-6C) membered hydrocarbon cyclic ring (optionally substituted). Independent claims are included for: (1) a process of odorization of an odorless fuel gas comprising adding the composition in very pure and diluted form; and (2) a gas fuel comprising the composition at 1-500 mg/Nm 3>, preferably 2-50 mg/Nm 3>. #CMT#USE : #/CMT# The composition is useful as odorant for odorless gas fuel, particularly for natural gas fuel (claimed). #CMT#ADVANTAGE : #/CMT# The composition is safe e.g. free of explosion risk, stable and cost effective. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Composition: (I) is present at 5-14.95%, (II) at 85-94.95% and (III) at 0.005-0.05%. The composition comprises tetrahydrothiophene, methyl acrylate and ethyl acrylate. Preferred Components: The nitroxide radical is a tetramethyl piperidine oxide of formula (IV). R 5OH, NH 2, R6COO- or R6CON-; and R6 : 1-4C alkyl. #CMT#[Image]#/CMT# #CMT#SPECIFIC COMPOUNDS : #/CMT# The use of tetrahydrothiophene (preferred), methyl ethyl sulfide, dimethylsulfide and/or diethylsufide is specifically claimed as (I). The use of methyl acrylate and ethyl acrylate (both preferred), n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate and/or dodecyl acrylate is specifically claimed as (II). The use of N(tert-butyl)-N-(1[ethoxy(ethyl)phosphino]propyl) nitroxide, N-(tert-butyl)-N-(1-diethylphosphono-2,2- dimethylpropyl)nitroxide and/or N-(tertbutyl)-N([2-methyl-1-phenyl]propyl)nitroxide is specifically claimed as (III). #CMT#EXAMPLE : #/CMT# Typical composition comprised (in g): ethyl acrylate (58.6); methyl acrylate (29.3); tetrahydrothiophene (120); and N-(tert-butyl)-N-(1-diethylphosphono-2,2-dimethylpropyl)nitroxide (0.1).