Colorless oily liquid; strong irritating odor; miscible with water; soluble in alcohol, ether and so on.

CAS:   79-31-2

MF:   C4H8O2

MW:   88.11

EINECS:  201-195-7

Synonyms: Methypropionic acid, Isopropyl formic acid, Isobutyric acid, FEMA 2222;2-Methyl propiori cacid, 2-Methylpropionic acid, 2-METHYL PROPANOIC ACID

Properties

Density:   0.95g/cm3

Melting Point(℃):   -47℃

Boiling Point(℃):  153-154°C

Flash Point(℃):   55.56°C/ 132℉

Refractive index:   1.393

Water Solubility:   210 g/L (20℃)

Solubility:   618g/l

FEMA:   2222 | ISOBUTYRIC ACID

vapor pressure:  1.5 mm Hg ( 20 °C)

refractive index:   n20/D 1.393(lit.)

pka:  4.84(at 20℃)

PH:   2.3 (500g/l, H2O, 25℃)

Explosive Limit:  1.6-7.3%(V)

Merck:  14,5155

BRN:   635770

Application

1. 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 as edible flavor and used in pharmaceutical.
2. GB 2760-1996 provides for isobutyric acid as the food flavors allowed to use. It is mainly used for the preparation of butter, apple, caramel, cheese, bread, yeast and other flavors.
3. Isobutyric acid is not more important than butyric acid, but has the similar uses with n-butyric acid. Isobutyric acid is mainly used to produce the corresponding esters, such as methyl isobutyrate with apricot incense, propyl isobutyrate with pineapple flavor, isobutyl isobutyrate with banana flavor, octyl isobutyrate with grapes taste, benzyl isobutyrate with jasmine smell, etc. It can be used for preparing flavors and solvents and also used in the manufacture of varnishes and plasticizers. 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.
4. Used for the raw materials of perfume and perfume ester, and also used as the solvents of textile auxiliaries (in the form of salt) and a variety of chemical reactions.

Safety Information

Symbol(GHS) 

 GHS02, GHS05,GHS06, GHS07

Signal word: Danger

Hazard Codes:   Xn

Risk:  21/22

Safety:   23-36/37/39-24/25

RIDADR:  UN 2529 3/PG 3

RTECS   NQ4375000

F   13

TSCA   Yes

Hazard Class   3

Packing Group   III

Structural formula: