Produktnavn: |
Isosmørsyre |
CAS: |
79-31-2 |
MF: |
C4H8O2 |
MW: |
88.11 |
EINECS: |
201-195-7 |
Mol File: |
79-31-2.mol |
|
Melting point |
-47 °C |
Boiling point |
153-154 °C(lit.) |
tetthet |
0,95 g / ml ved 25 ° C (opplyst) |
vapor density |
3.04 (mot luft) |
damptrykk |
1,5 mm Hg (20 ° C) |
brytningsindeks |
n20/D 1.393(lit.) |
FEMA |
2222 | ISOBUTYRIC ACID |
Fp |
132 ° F |
lagringstemperatur |
room temp |
solubility |
618g / l |
pka |
4.84(at 20℃) |
skjema |
Væske |
farge |
Clear colorless |
PH |
2.3 (500g/l, H2O, 25℃) |
Luktterskel |
0,0015 ppm |
eksplosjonsgrense |
1.6-7.3%(V) |
Vannløselighet |
210 g / L (20 ºC) |
JECFA Number |
253 |
Merck |
14,5155 |
BRN |
635770 |
InChIKey |
KQNPFQTWMSNSAP-UHFFFAOYSA-N |
CAS DataBase Reference |
79-31-2(CAS DataBase Reference) |
NIST Chemistry Reference |
Propansyre, 2-metyl- (79-31-2) |
EPA Substance Registry System |
Isosmørsyre (79-31-2) |
Hazard Codes |
Xn |
Risikoverklæringer |
21/22 |
Safety Statements |
23-36 / 37 / 39-24 / 25 |
RIDADR |
UN 2529 3 / PG 3 |
WGK Germany |
1 |
RTECS |
NQ4375000 |
F |
13 |
Autoignition Temperature |
824 ° F |
TSCA |
Yes |
HazardClass |
3 |
PackingGroup |
III |
HS kode |
29156000 |
Hazardous Substances Data |
79-31-2(Hazardous Substances Data) |
Toksisitet |
LD50 oralt i kanin: 266 mg / kg LD50 hud Kanin 475 mg / kg |
Chemical properties |
Fargeløs oljevæske; sterk irriterende lukt; blandbar med vann; løselig i alkohol, eter og så videre. |
Content analysis |
Determined by the same content analysis method of "butyric acid (03454)". |
Toksisitet |
GRAS (FEMA). |
Bruk grenser |
FEMA (mg/kg): soft
drinks 4.1; cold drinks 12; candy 41; baked food 38; gummy candy 470;
margarine 30. |
Produksjonsmetode |
The preparation of
isobutyric acid is similar with butyric acid, which is performed by the
direct oxidation of isobutyl alcohol and isobutyraldehyde. Isobutyric acid
can be directly generated from the oxidation of isobutyraldehyde in air or
oxygen. Other manufacturing methods have isobutyronitrile hydrolysis and
methacrylic acid hydrogenation. The oxidation of 2-methyl-1-nitropropane to prepare
isobutyric acid can also obtain a higher yield. The purification of
Isobutyric acid can be realized by azeotropic distillation with water, and
anhydrous isobutyric acid can be obtained by the extractive distillation from
carbon tetrachloride. Propylene and formic acid ester can react at 50 °C with
the catalysis of hydrofluoric acid to generate methyl isobutyrate and propyl
isobutyrate. |
Informasjon om farer og sikkerhet |
Produksjonsmetode: Isosmørsyre kan stamme fra oksidasjon av isobutanol. |
Beskrivelse |
Isobutyric acid has an odor and flavor similar to n-butyric acid. Prepared via oxidation of isobutyl alcohol. |
Kjemiske egenskaper |
Isobutyric acid has strong penetrating odor of rancid butter. The odor and flavor are similar to n-butyric acid. |
Kjemiske egenskaper |
clear colorless liquid |
Bruker |
Isobutyric Acid is a flavoring agent that is a colorless liquid with a strong, penetrating odor, resembling butter. it is miscible in alcohol, propylene glycol, glycerin, mineral oil, and most fixed oils and sol- uble in water. it is obtained by chemical synthesis. it is also termed isopropylformic acid. |
Bruker |
Produksjon av estere for løsemidler, smaker og parfyme baser, desinfiserende middel, lakk, avgrensning av huder, garvemidler. |
Definisjon |
ChEBI: En forgrenet fettsyre som består av propansyre som bærer en metylgren ved C-2. |
Forberedelse |
By oxidation of isobutyl alcohol. |
Aroma threshold values |
Påvisning: 10 ppb til 9,5 ppm; aromaegenskaper ved 10 ppm: syrlig skarp, meierisk buttery andcheesy med fruktige undertoner. |
Smakterskelverdier |
Smakskarakteristika ved 15 ppm: surt, surt meieri, kremaktig, ost, dyrket meieri. |
Generell beskrivelse |
A colorless liquid with a light odor of rancid butter. Flash point 132°F. Density 7.9 lb / gal. Corrosive to metals and tissue. |
Air & Water Reactions |
Brannfarlig. Vannløselig |
Reactivity Profile |
Ismørsyrekorroderer aluminium og andre metaller. Brennbar hydrogengass kan akkumuleres i lukkede rom der denne reaksjonen har funnet sted [USCG, 1999]. |
Hazard |
Toxic by ingestion, strong irritant to tissue. |
Health Hazard |
Innånding forårsaker irritasjon av nese og hals. Svelging forårsaker irritasjon i munnen og magen. Kontakt med øyne eller hud forårsaker irritasjon. |
Fire Hazard |
Brennbart / brennbart materiale. Kan antennes av varme, gnister eller flammer. Damp kan danne eksplosive blandinger med luft. Damp kan komme til antennelseskilden og blinke tilbake. De fleste damper er tyngre enn luft. De vil spre seg langs bakken og samle inn lave eller begrensede områder (kloakk, kjellere, tanker). Dampeksplosjonsfare innendørs, utendørs eller i kloakk. Avrenning til kloakk kan forårsake brann eller eksplosjonsfare. Beholdere kan eksplodere ved oppvarming. Mange væsker er lettere enn vann. |
Purification Methods |
Destiller syren fra KMnO4, og destiller den deretter fra P2O5. [Beilstein 2 H 288, 2 I 126, 2 II 257, 2III 637, 2 IV 843.] |
Preparation Products |
Permethrin-->Gemfibrozil-->Captopril-->Isobutyryl chloride-->Isobutyric anhydride-->Ethofenprox-->ethyl 3,3-dimethylpent-4-en-1-oate-->4-(3-ISOPROPYL-1,2,4-OXADIAZOL-5-YL)PIPERIDINE-->Methyl isobutyrate-->tert-Butyl peroxypivalate-->ethyl 4,6,6-trichloro-3,3-dimethyl-hex-5-enoate-->Isobutyramide-->Benzyl isobutyrate-->Isobutyl formate-->2-(4-Ethoxyphenyl)-2-methylpropanol-->Ethyl isobutyrate-->CITRONELLYL ISOBUTYRATE-->2-Bromo-2-methylpropionyl bromide-->Ethyl 2-(2-aminothiazole-4-yl)-2-(1-tert-butoxycarbonyl-1-methylethoxyimino)acetate-->Phenoxyethyl isobutyrate-->Butyl isobutyrate-->P-TOLYL ISOBUTYRATE-->Phenethyl isobutyrate-->OCTYL ISOBUTYRATE-->HEPTYL ISOBUTYRATE-->CINNAMYL ISOBUTYRATE-->Ethyl 2-bromoisobutyrate-->Hexyl isobutyrate |
Råvarer |
Carbon tetrachloride-->Hydrazinium hydroxide-->Hydrofluoric acid-->2-Methyl-1-propanol-->(3R,4S)-1-Benzoyl-3-(1-methoxy-1-methylethoxy)-4-phenyl-2-azetidinone-->Methacrylic acid-->Isobutyraldehyde-->(-)-MENTHYL CHLOROFORMATE-->Isobutyronitrile-->Diazinon-->Propyl gallate-->1-Nitropropane-->BUTYRAMIDINE-->Methyl isobutyrate-->AROMA-->Isopentyl isobutyrate-->Benzyl isobutyrate-->OCTYL ISOBUTYRATE |