EP2066766A1 - Schwefelarme odoriermittel mit verbesserter stabilität - Google Patents
Schwefelarme odoriermittel mit verbesserter stabilitätInfo
- Publication number
- EP2066766A1 EP2066766A1 EP07820469A EP07820469A EP2066766A1 EP 2066766 A1 EP2066766 A1 EP 2066766A1 EP 07820469 A EP07820469 A EP 07820469A EP 07820469 A EP07820469 A EP 07820469A EP 2066766 A1 EP2066766 A1 EP 2066766A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- odorant
- ppm
- compounds
- formula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/003—Additives for gaseous fuels
- C10L3/006—Additives for gaseous fuels detectable by the senses
Definitions
- the present invention relates to low-sulfur odorants comprising or consisting of A) methyl acrylate and / or ethyl ester, B) tetrahydrothiophene (THT) and C) hydroquinone monomethyl ether in certain
- an odorizing agent according to the invention may comprise one, two or more stabilizing components, compare in this regard the information on the components D) and E) below.
- the invention also relates to a corresponding fuel gas (preferably natural gas) having a methane content of at least 60% by weight, which comprises a proportion of the odorant according to the invention.
- the town and coke oven gas previously used for public gas supply contained intensely smelling components and therefore had one strong odor, so that escaping gas could be easily perceived.
- gas odorization is meant the addition of odorous, acting as warning or alarm substances (odorants) to gases that have no significant odor, i. to otherwise substantially or completely odorless gases.
- gas is therefore odorized by the addition of odor-intensive substances.
- DVGW German Association of Gas and Water.
- These odorants are also perceptible in high dilution and, due to their exceptionally unpleasant odor, cause, as desired, an alarm association in humans.
- the odorant must not only smell unpleasant and unmistakable, but above all clearly represent a warning smell. Therefore, the odor of the odorized gas must not escape from everyday life, eg from the kitchen and man Household, be familiar.
- THT tetrahydrothiophene
- the odorization with mercaptans is also common.
- shock odorization up to three times the amount of odorant is added to the gas as compared to conventional odorization.
- the shock odorization is used, for example, when commissioning new networks or line sections for faster achievement of the minimum odorant concentration or also to detect small leaks in the gas installation.
- THT alone is ideal for reliable odorization of gas.
- sulfur oxides as combustion products.
- JP-B-51-007481 mentions that acrylic acid alkyl esters such as methyl acrylate, ethyl acrylate and butyl acrylate are known to have weak odorant properties for fuel gases and have practically no significance in this respect.
- JP-A 55-104393 describes that odorant containing an alkyne and at least 2 compounds selected from a group consisting of methyl acrylate, ethyl acrylate, methyl methacrylate, allyl methacrylate, ethyl propionate, methyl n-butyrate, methyl isobutyrate and prenyl acrylate , and optionally tert-butylmercaptan, are suitable for the odorization of fuel gases.
- the amount of odorant is 50 ppm by weight (mg / kg gas), preferably greater than or equal to 100 ppm. The best results at LPG - A -
- JP-B-51-034841 "odor thresholds" of various substances were determined, with n-valeric acid, n-butyric acid, isobutyraldehyde and various methylamines having low odor odor thresholds.
- Ethyl acrylate or n-valeric acid used alone did not have sufficient odorizing.
- An optimized mixture comprised 50-90% by weight of ethyl acrylate, 10-50% by weight of n-valeric acid and optionally triethylamine.
- the most effective mixture included ethyl acrylate, n-valeric acid and triethylamine, this mixture containing equal parts by weight of n-valeric acid and triethylamine and 30 to 80% by weight of ethyl acrylate; a corresponding mixture consisting of 60% by weight of ethyl acrylate and 20% by weight of n-valeric acid and triethylamine was added to a gaseous fuel gas at 10 mg / m 3 .
- Odorants for fuel gases consisting of ethyl acrylate (70 wt .-%) and tert-butyl mercaptan (30 wt .-%) are known from JP-B 51 -021402. This mixture was added to a gaseous fuel gas in an amount of 5 mg / m 3 .
- Odorants for the odorization of hot gases consisting of a) 30-70 wt .-% CrC 4 -Alkylmercaptanen, b) 10-30 wt .-% n-valeraldehyde and / or isovaleraldehyde, n-butyric acid and / or isobutyric acid and optionally c ) Up to 60 wt .-% tetrahydrothiophene (THT) are described in DE-A 31 51 215. These odorants were added to heating gas in quantities of 5-40 mg / m 3 .
- Mixtures comprising a) 1 part by weight of dimethyl sulphide, b) 0.8-3 parts by weight of tert-butylmercaptan and c) 0.1-0.2 parts by weight of tert-heptylmercaptan or 0.05-0.3 parts by weight of tert-hexylmercaptan for O- Dorleiter of fuel gases are known from JP-A 61-223094. These mixtures had a smell of tert-butylmercaptan, which was mixed with the
- norbornene derivatives for fuel gas odorization is known from JP-A 55056190.
- LPG was mixed at 40 mg / kg with a mixture of equal parts of 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene and 50 mg / kg with a mixture of 80% by weight of 5-ethylidene-2 norbornene and 20
- US Pat. No. 4,487,613 proposes odorants for fuel gases with a high proportion of sulfur-containing compounds which additionally contain the warning odor-enhancing compounds 2-methoxy-3-isobutylpyrazine and / or 4-methyl-4-ylene. mercapto-2-pentanone.
- the odorants disclosed in US Pat. No. 4,487,613 may also contain small amounts of methyl acrylate.
- WO 2005/061680 describes the use of a mixture comprising (a) at least two different acrylic acid-CrC ⁇ -alkyl esters, (b) at least one compound from the group of the Ci-C 8 -mercaptans, the C 4 -Ci 2 -T-hiophenes, the C 2 -C 8 sulphides or the C 2 -C 8 disulphides and (c) at least one compound from the group of the norbornenes, the C 1 -C 6 -carboxylic acids, the C 1 -C 8 -aldehydes, the C 6 -C 4 Phenols, C 7 -C 4 anisoles or C 4 -C 4 -pyrazines, and optionally (d) an antioxidant for odorizing fuel gas with a methane content of at least 60% by weight.
- WO 2005/103210 relates to odorants and corresponding odorized gases comprising
- WO 2005/103210 allegedly represent improved odorants.
- WO 2005/103210 states that the N-oxides proposed therein effectively prevent the radical polymerization of the acrylic acid esters contained therein, which odorants are of course to avoid.
- Particular preference is given in WO 2005/103210 to mixtures comprising ethyl acrylate and THT.
- N-oxides can be oxidized in the presence of copper ions (to the corresponding nitrenes) or reduced in the presence of iron ions (to the corresponding N-hydroxy compounds).
- the present invention is a mixture (hereinafter referred to as
- R is selected from the group consisting of H, -OH, -NH 2 , -O 2 CR 1 and -NOCR 1 , where R 1 is an alkyl radical having 1 to 4 C atoms,
- Another object of the present invention is a fuel gas with a methane content of at least 60 wt .-% comprising an inventive odorant.
- an inventive odorant for use in fuel gases according to the invention, reference is made to the following statements on preferred odorants.
- the fuel gas to be odorized or the fuel gas according to the invention has a methane content of at least 60% by weight, preferably of at least 70% by weight and more preferably of at least 75% by weight.
- the total amount of methyl acrylate and ethyl acrylate (component (A)) in the odorants according to the invention is at least 75 wt .-%, preferably at least 84 wt .-%.
- the odorizing agents according to the invention comprise methyl acrylate and ethyl acrylate
- the preferred weight ratio of methyl acrylate to ethyl acrylate is in the range 9: 1 to 1: 9, preferably in the range 7: 3 to 3: 7, in particular in the range 3: 1 to 1: 4
- the weight ratio of methyl acrylate to ethyl acrylate is very particularly preferably in the range from 1: 1 to 1: 3.
- the compound tetrahydrothiophene (component (B)) is contained in the odorants according to the invention at 2 to 19.5% by weight, preferably at 5 to 15% by weight.
- component (C) The compound hydroquinone monomethyl ether (4-methoxyphenol, MeHQ) (component (C)) is present in the odorizing agents according to the invention in very small amounts, which are in the range from 5 to 50 ppm, preferably 10 to 20 ppm.
- component (C) is surprisingly not required to achieve a high stability of the odorant; the use of the inventively provided small amount of component (C) is particularly in the presence of component (E) for stability reasons advantageous (see also the examples).
- Odorants according to the invention preferably comprise
- component (D) 0.025-0.2% by weight of butylhydroxytoluene and / or butylhydroxyanisole
- R is selected from the group consisting of H, -OH, -NH 2 , -O 2 CR 1 and - NOCR 1 , where R 1 is an alkyl radical having 1 to 4 carbon atoms.
- the total amount of the compounds of component (D) is butylhydroxytoluene (BHT, ionol, 2,6-di-tert-butyl-p-cresol, E 321) and / or
- Butylated hydroxyanisole (BHA, E 320) in the odorants according to the invention in the range of 0.025 to 0.2 wt .-%, preferably in the range of 0.05 to 0.15% by weight.
- component (C) Due to the presence of component (C), in particular in combination with one or both other components (D) and / or (E), in particular a high storage stability of the odorant according to the invention and an odorized fuel gas according to the invention is achieved.
- Storage stability tests have shown that the warning odor odorant according to the invention in a fuel gas over a period of more than 8 months at 40 0 C (incubator) remains largely the same, see also the examples below.
- component (C) and one of components (D) and / or (E) a particularly high storage stability is achieved.
- the total amount of component (E) in preferred odorants according to the invention is in the range of 5 - 500 ppm, preferably in the range of 10 -
- the compounds of formula (I) are stable N-oxides.
- the synthesis of stable N-oxides of the formula (I) is described in detail in the literature, for example in Chem. Rev. 1978, 78, 37, Synthesis 1971, 190 and "Synthetic Chemistry of Stable Nitroxides", LB Volodarsky et al. CRC Press, 1993, ISBN: 0-8493-4590-1.
- the amount of odorant based on the fuel gas to be odorized is typically in the range 2 to 100 mg / m 3 , preferably 3 to 50 mg / m 3 , more preferably 5 to 40 mg / m 3, and most preferably 8 to 35 mg / m 3 .
- the odorants according to the invention and the fuel gases containing these mixtures preferably contain neither tert-butylmercaptan (TBM) nor ethylmercaptan in addition to THT (component (B)).
- the odorant does not comprise any mercaptan at all.
- TBM tert-butylmercaptan
- ethylmercaptan ethylmercaptan
- the odorant does not comprise any mercaptan at all.
- Preferred odorants according to the invention comprise or consist of:
- Particularly preferred odorants according to the invention include:
- inventive odorant (A) at least 84% by weight of methyl acrylate and / or ethyl acrylate
- R is selected from the group consisting of H and -OH.
- the particularly preferred mixtures are distinguished by a particularly high storage stability.
- combinations of hydroquinone monomethyl ether (component (C)) and At least one further component (D) and / or (E) partially observed synergistic stability improvements.
- component (E) one or more compounds of the formula (I) are contained in an odorizing agent according to the invention, these do not show the disadvantages discussed above of the compounds proposed according to WO 2005/103210
- Odor which is probably due to the presence of component (C), that is, the presence of the small amount of hydroquinone monomethyl ether.
- Very particularly preferred odors according to the invention contain or consist of
- the present invention also relates to a container comprising:
- Reactant is contacted, which is capable of reacting with the component (E).
- odorants comprising component (E) to be used in this case, reference is made to the above statements on odorants and fuel gases according to the invention.
- MeAc methyl acrylate
- EtAc ethyl acrylate
- THT tetrahydrothiophene
- MeHQ hydroquinone monomethyl ether
- BHT 2,6-di-tert-butyl-p-cresol
- TEMPO 2,2,6,6-tetramethyl-piperidine-1-oxyl.
- Natural gas Natural gas L, methane content: approx. 85 vol.% are evaluated by smell with regard to their warning odor and their warning intensity against unorbed natural gas (blank value). These concentrations correspond to the typical concentrations of odorant in natural gas under normal conditions.
- the experiment was carried out at room temperature (about 20 0 C) such that in a gas stream in a tube, the odorant is metered. At the end of this 2 m long tube (within the tube is the homogenization), the exiting odorized gas is evaluated by a group of trained examiners (8 to 12 people) odor. The evaluation took place on one
- the odorants according to the invention natural gas L were added and the odorized natural gas after certain periods at 40 0 C storage as described odor tested.
- the criterion for storage stability was the significant odor match of the stored odorized gas with the original warning odor.
- the results were essentially the same for the two concentrations tested (10 and 25 mg / Nm 3 gas).
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Cosmetics (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL07820469T PL2066766T3 (pl) | 2006-09-22 | 2007-09-21 | Środki nawaniające o niskiej zawartości siarki i o polepszonej trwałości |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202006014741U DE202006014741U1 (de) | 2006-09-22 | 2006-09-22 | Schwefelarme Odoriermittel mit verbesserter Stabilität |
PCT/EP2007/060057 WO2008034901A1 (de) | 2006-09-22 | 2007-09-21 | Schwefelarme odoriermittel mit verbesserter stabilität |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2066766A1 true EP2066766A1 (de) | 2009-06-10 |
EP2066766B1 EP2066766B1 (de) | 2015-07-01 |
Family
ID=37514119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07820469.0A Revoked EP2066766B1 (de) | 2006-09-22 | 2007-09-21 | Schwefelarme odoriermittel mit verbesserter stabilität |
Country Status (8)
Country | Link |
---|---|
US (1) | US20110155616A1 (de) |
EP (1) | EP2066766B1 (de) |
CN (1) | CN101517045A (de) |
DE (1) | DE202006014741U1 (de) |
DK (1) | DK2066766T3 (de) |
ES (1) | ES2548521T3 (de) |
PL (1) | PL2066766T3 (de) |
WO (1) | WO2008034901A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006018157U1 (de) * | 2006-11-28 | 2007-03-22 | Symrise Gmbh & Co. Kg | Odoriermittel mit verbesserter Stabilität |
MX356985B (es) * | 2013-10-01 | 2018-06-21 | Aygaz Anonim Sirketi | Odorizante de gas libre de azufre. |
CA2956623C (en) | 2014-07-30 | 2020-10-27 | Georgia-Pacific Consumer Products Lp | Air freshener dispensers, cartridges therefor, systems, and methods |
CN108138062A (zh) * | 2015-10-26 | 2018-06-08 | 国际壳牌研究有限公司 | 添味甲烷流体和用于制造添味甲烷流体的方法以及其用途 |
CA3002580A1 (en) * | 2015-10-26 | 2017-05-04 | Shell Internationale Research Maatschappij B.V. | Fluid comprising methane and a tracer, and processes for producing it and the use thereof |
CN113956904A (zh) * | 2021-11-25 | 2022-01-21 | 沈阳光正工业有限公司 | 一种可燃气体用无硫含量的气味添加剂及其制备方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4487613A (en) * | 1983-09-26 | 1984-12-11 | International Flavors & Fragrances Inc. | Odorization of combustible hydrocarbon gases |
US4608240A (en) * | 1983-11-04 | 1986-08-26 | Hylsa, S.A. | Method for the desulfurization of hydrocarbon gas |
DE10240028A1 (de) * | 2002-08-27 | 2004-03-11 | Symrise Gmbh & Co. Kg | Schwefelarme Odoriermittel für Flüssiggas |
DE10359743A1 (de) | 2003-12-19 | 2005-07-14 | Symrise Gmbh & Co. Kg | Odorierung von Brenngas mit schwefelarmen Odoriermitteln |
FR2868790B1 (fr) | 2004-04-08 | 2008-07-25 | Arkema Sa | Melange odorisant pour combustible gazeux inodore |
-
2006
- 2006-09-22 DE DE202006014741U patent/DE202006014741U1/de not_active Expired - Lifetime
-
2007
- 2007-09-21 US US12/442,074 patent/US20110155616A1/en not_active Abandoned
- 2007-09-21 WO PCT/EP2007/060057 patent/WO2008034901A1/de active Application Filing
- 2007-09-21 CN CNA2007800352668A patent/CN101517045A/zh active Pending
- 2007-09-21 PL PL07820469T patent/PL2066766T3/pl unknown
- 2007-09-21 DK DK07820469.0T patent/DK2066766T3/en active
- 2007-09-21 EP EP07820469.0A patent/EP2066766B1/de not_active Revoked
- 2007-09-21 ES ES07820469.0T patent/ES2548521T3/es active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008034901A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL2066766T3 (pl) | 2016-04-29 |
DK2066766T3 (en) | 2015-10-05 |
CN101517045A (zh) | 2009-08-26 |
EP2066766B1 (de) | 2015-07-01 |
WO2008034901A1 (de) | 2008-03-27 |
US20110155616A1 (en) | 2011-06-30 |
ES2548521T3 (es) | 2015-10-19 |
DE202006014741U1 (de) | 2006-11-23 |
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