CAS : 107-92-6
formula : C4H8O2
molecular weight : 88.10
boiling point : 162-165 ° C
melting point : -7--5 ° C
Chinese name :
k acid; is acid; KILLING-ju acid; GABA
English title : n - Butyric acid; Butanoic acid; butyric acid; 1-propanecarboxylic acid; acide butyrique; butanic acid; buttersaeure; butyrate; ethylacetic acid; kyselina maselna; n-butanoic acid; propylformic acid
traits Description : transparent colorless, oily liquid with irritation and unpleasant odor, a very dilute solution Khan also smell. -4.26 ° C melting point. Boiling point of 163.7 ° C (101kPa), the relative density of 0.959 (20 / 4 ° C), the refractive index of 1.3984. Flash point (open cup) 77 ° C With water, alcohol, ether immiscibility.
acid with water to form the dual azeotropic mixture boiling point of 99.4 ° C, water content of 81.4%. Acid Esters often in the form of free or state exists in nature, such as acid glyceride exist in butter, so the acid called GABA. Plastic from the acid found in animal feces and sweat. Milk rancidity also the stench emitted from butyrate production of acid hydrolysis.
production methods : 1. Butyraldehyde oxidation butyraldehyde acid in the presence of manganese catalyst with air or oxygen oxidation reaction, namely positive acid. Butyraldehyde be butanol oxydehydrogenation or propylene carbonylation reaction derived.
2. Propylene oxo synthesis of Ni (CO) 4 catalyst from propylene by oxo synthesis.
3. Amyl nitrate alcohol oxidation by amyl alcohol in the boiling concentrated nitric acid were first elimination reaction occurred, the loss of water and generation member of olefin, olefin further oxidation by nitric acid and lost a carbon atom, generation of acid.
4. Fermentation starch and molasses as raw material, used acid fermentation bacteria that can be used to take acid and lactic acid.
purposes : acid is mainly used in manufacturing cellulose butyrate, for the manufacture of heat molding plates, glasses, car steering wheel, black phone components such as the Anti-aging; Water resistance; Systolic and so strong than cellulose acetate, butyrate is also extensively used in the manufacture of varnish and molding powder. Acid used in the manufacture of cellulose acetate, with a variety of resin Miscibility more allocation for varnish; Glass and cotton blended.
acid for the synthesis of various butyrate, cellulose flame retardants and other organic synthesis, the main acid derivatives is formic acid, ethyl, α-butyl bromide, butyramide, butyrylcholinesterase aniline, Ding chloride, three acid glyceride, Ding benzene - ether; Mr Fennel amine acid amides, etc.. For spices, food additives, pharmaceuticals, fire retardants, such as fungicides used.
acid esters with pleasant fruit flavor, such as a small apple scented methyl, ethyl a small pineapple aromas, acid Isoamyl a Sydney aromas, acid isopropyl also pineapple flavor. Daily Flavor of acid and butyric acid ester Linalyl geranylflavanone are also acid ester derivatives.
acid stench is material, the use of which is restricted, but also those with the raw materials indispensable material. It is not only for butter, cheese flavoring spices of the main raw materials, but also make many fruit flavor by taste, such as thickening. As for the smell, the use of a trace amount of the acid can be issued very strong; A strong smell. Br>
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