Isobutyric acid
- CAS No.
- 79-31-2
- Chemical Name:
- Isobutyric acid
- Synonyms
- 2-METHYLPROPIONIC ACID;Isobutanoic acid;2-METHYL PROPANOIC ACID;Isobutric acid;Propanoicacid,2-methyl-;FEMA 2222;alpha-methylpropionicacid;dimethyl-aceticaci;Dimethylacetic acid;METHYLPROPIONIC ACID
- CBNumber:
- CB3367722
- Molecular Formula:
- C4H8O2
- Molecular Weight:
- 88.11
- MDL Number:
- MFCD00002658
- MOL File:
- 79-31-2.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Melting point | -47 °C (lit.) |
|---|---|
| Boiling point | 153-154 °C (lit.) |
| Density | 0.95 g/mL at 25 °C (lit.) |
| vapor density | 3.04 (vs air) |
| vapor pressure | 1.5 mm Hg ( 20 °C) |
| refractive index |
n |
| FEMA | 2222 | ISOBUTYRIC ACID |
| FLAVIS Number | 08.006 | 2-Methylpropionic acid |
| Flash point | 132 °F |
| storage temp. | Store below +30°C. |
| solubility | 618g/l |
| form | Liquid |
| pka | 4.84(at 20℃) |
| color | Clear colorless |
| PH | 3.96(1 mM solution);3.44(10 mM solution);2.93(100 mM solution); |
| Odor | at 1.00 % in propylene glycol. acidic sour cheese dairy buttery rancid |
| Odor Type | acidic |
| Odor Threshold | 0.0015ppm |
| biological source | synthetic |
| explosive limit | 1.6-7.3%(V) |
| Water Solubility | 210 g/L (20 ºC) |
| Specific Heat Capacity | Cp(liquid): 1.96 J/(g·K), at 25℃ |
| JECFA Number | 253 |
| Merck | 14,5155 |
| BRN | 635770 |
| Henry's Law Constant | 4.6×101 mol/(m3Pa) at 25℃, Kim and Kim (2016) |
| Dielectric constant | 2.6(Ambient) |
| Major Application | flavors and fragrances |
| Cosmetics Ingredients Functions | BUFFERING |
| InChI | 1S/C4H8O2/c1-3(2)4(5)6/h3H,1-2H3,(H,5,6) |
| InChIKey | KQNPFQTWMSNSAP-UHFFFAOYSA-N |
| SMILES | CC(C)C(O)=O |
| LogP | 1.1 at 25℃ |
| CAS DataBase Reference | 79-31-2(CAS DataBase Reference) |
| Substances Added to Food (formerly EAFUS) | ISOBUTYRIC ACID |
| FDA 21 CFR | 172.515 |
| EWG's Food Scores | 1-2 |
| FDA UNII | 8LL210O1U0 |
| NIST Chemistry Reference | Propanoic acid, 2-methyl-(79-31-2) |
| EPA Substance Registry System | Isobutyric acid (79-31-2) |
| UNSPSC Code | 85151701 |
| NACRES | NA.24 |
| CAS Number Unlabeled | 79-31-2 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |    GHS02,GHS05,GHS06 |
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|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H301+H311-H314-H226-H290 | |||||||||
| Precautionary statements | P501-P270-P240-P210-P233-P234-P243-P241-P242-P264-P280-P370+P378-P390-P361+P364-P303+P361+P353-P301+P330+P331-P301+P310+P330-P304+P340+P310-P305+P351+P338+P310-P403+P235-P406-P405 | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter | |||||||||
| Hazard Codes | Xn | |||||||||
| Risk Statements | 21/22 | |||||||||
| Safety Statements | 23-36/37/39-24/25 | |||||||||
| RIDADR | UN 2529 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | NQ4375000 | |||||||||
| F | 13 | |||||||||
| Autoignition Temperature | 824 °F | |||||||||
| TSCA | TSCA listed | |||||||||
| HazardClass | 3 | |||||||||
| PackingGroup | III | |||||||||
| HS Code | 29156000 | |||||||||
| Storage Class | 3 - Flammable liquids | |||||||||
| Hazard Classifications | Acute Tox. 3 Dermal Acute Tox. 4 Oral Eye Dam. 1 Flam. Liq. 3 Skin Corr. 1B |
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| Hazardous Substances Data | 79-31-2(Hazardous Substances Data) | |||||||||
| Toxicity | LD50 orally in Rabbit: 266 mg/kg LD50 dermal Rabbit 475 mg/kg | |||||||||
| REACH Registrations | Active | |||||||||
| Limited Quantities | 5.0 L (1.3 gallons) (liquid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L) | |||||||||
| NFPA 704 |
|
Isobutyric acid price More Price(64)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | W222216 | Isobutyric acid natural, ≥99%, FCC, FG | 79-31-2 | 1 each | $63.7 | 2026-04-30 | Buy |
| Sigma-Aldrich | W222208 | Isobutyric acid ≥99%, FCC, FG | 79-31-2 | 1 each | $58 | 2026-04-30 | Buy |
| Sigma-Aldrich | W222216 | Isobutyric Acid natural, ≥99%, FCC, FG | 79-31-2 | 100g | $143 | 2026-04-30 | Buy |
| Sigma-Aldrich | W222208 | Isobutyric Acid ≥99%, FCC, FG | 79-31-2 | 1kg | $101 | 2026-04-30 | Buy |
| Sigma-Aldrich | W222216 | Isobutyric Acid natural, ≥99%, FCC, FG | 79-31-2 | 1kg | $229 | 2026-04-30 | Buy |
Isobutyric acid Chemical Properties,Uses,Production
Chemical Properties
Isobutyric acid is a clear colorless oily liquid with an odor and flavor similar to n-butyric acid. Miscible with water, soluble in ethanol and ether. Prepared via oxidation of isobutyl alcohol.
Physical properties
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 soluble in water. it is obtained by chemical synthesis. it is also termed isopropylformic acid.
Occurrence
Isobutyric acid occurs naturally in Ceratonia siliqua L. The gum obtained from the kernels of this species is used as a thickener in the food industry. Reported found in several essential oils: Arnica montana, Roman chamomile, Laurus nobilis, imperatoria, and in carob fruits (Siliqua dulcis); also identified in the essence of Seseli tortuosum, Artemisia transiliensis.
Uses
Isobutyric acid is used to prepare esters for flavors and perfumes. It is also used as a disinfecting agent, preservative and tanning agent. It finds applications in textile, varnish and the leather industry. Further, it is used as a lactation stimulant in dairy cattle. In addition to this, it is used in the preparation of tetramethylsuccinic acid and diisopropyl ketone.
Preparation
Isobutyric acid is prepared in a similar way to butyric acid, mainly by direct oxidation of isobutanol and isobutyraldehyde, which is obtained by a direct oxidation reaction with air or oxygen.
Application
Isobutyric acid is mainly used in the synthesis of isobutyric acid esters, such as methyl isobutyrate, propyl ester, isoamyl ester and benzyl ester. It can also be used manufacture of esters for solvents, flavors and perfume bases, disinfecting agent, varnish, plasticizers, deliming hides, tanning agent and used in pharmaceutical. Isobutyric acid has some important derivatives that, in the industry, is actually used for the production of isobutyronitrile intermediates, and then converted to isobutylamidine hydrochloride that is the raw materials of pesticide diazinon.
Definition
ChEBI: Isobutyric acid is a branched fatty acid comprising propanoic acid carrying a methyl branch at C-2. It has a role as a volatile oil component, a plant metabolite and a Daphnia magna metabolite. It is a branched-chain saturated fatty acid, a methyl-branched fatty acid and a fatty acid 4:0. It is a conjugate acid of an isobutyrate.
Aroma threshold values
Detection: 10 ppb to 9.5 ppm; aroma characteristics at 10 ppm: acidic pungent, dairy buttery and cheesy with fruity undertones.
Taste threshold values
Taste characteristics at 15 ppm: acidic, sour dairy, creamy, cheese, cultured dairy nuance.
General Description
Isobutyric acid appears as 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
Flammable. Water soluble
Reactivity Profile
Isobutyric acid corrodes aluminum and other metals. Flammable hydrogen gas may accumulate in enclosed spaces in which this reaction has taken place [USCG, 1999].
Hazard
Toxic by ingestion, strong irritant to tissue.
Health Hazard
Inhalation causes irritation of nose and throat. Ingestion causes irritation of mouth and stomach. Contact with eyes or skin causes irritation.
Fire Hazard
Flammable/combustible material. May be ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Biochem/physiol Actions
Odor at 10 ppm
Synthesis
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.
Purification Methods
Distil the acid from KMnO4, then redistil it from P2O5. [Beilstein 2 H 288, 2 I 126, 2 II 257, 2 III 637, 2 IV 843.]
Toxics Screening Level
An Initial Threshold Screening Level (ITSL) of 0.9 μg/m3) based on an annual averaging time is being established at this time for isobutyric acid.
Pesticide Type
Fungicide
Isobutyric acid Preparation Products And Raw materials
Raw materials
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Preparation Products
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| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Yangzhou Huayang Chemical Auxiliary Co., Ltd. | 15358929297 | 229902609@qq.com | China | 11 | 58 |
| shanghaidelaikekejiyouxiangongsi | 17351445187 | 3528434302@qq.com | China | 282 | 58 |
| Ji' nan century Tongda chemical co., ltd | 13075318675; 13075318675 | 2256668363@qq.com | China | 385 | 58 |
| Jinan Yuanshang New Materials Co., Ltd | 0152-69160223 15269160223 | 15269160223@163.com | China | 969 | 58 |
| Yixing Wencheng Chemical Co., Ltd | 13961572207 13961572207 | david@un-wencheng.com | China | 105 | 58 |
| Hubei long Kang Sheng Fine Chemical Co., Ltd. | 027-027-83850368 18140587623 | 3052398675@qq.com | China | 992 | 58 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 | 3bsc@sina.com | China | 15813 | 69 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
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- May 20,2026
View Lastest Price from Isobutyric acid manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-05-28 | Isobutyric Acid
79-31-2
|
$10.70 | 10kg | 99% | 10000kg | Hebei Chuanghai Biotechnology Co,.LTD | |
 |
2026-05-15 | Isobutyric acid
79-31-2
|
$1.50 | 1g | 99.0% Min | 100 Tons | Shaanxi Didu New Materials Co. Ltd | |
 |
2026-03-20 | Isobutyric acid
79-31-2
|
$10.00 | 1kg | 99% | 100 TON | Hebei Chuanghai Biotechnology Co., Ltd |
-
- Isobutyric Acid
79-31-2
- $10.70
- 99%
- Hebei Chuanghai Biotechnology Co,.LTD
-
- Isobutyric acid
79-31-2
- $1.50
- 99.0% Min
- Shaanxi Didu New Materials Co. Ltd
-
- Isobutyric acid
79-31-2
- $10.00
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
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