Mtengo Wabwino Wopanga Stearic acid CAS:57-11-4

kufotokozera mwachidule:

Stearic acid: (mtundu wa mafakitale) Octadecanoic acid, C18H36O2, imapangidwa ndi hydrolysis ya mafuta ndipo imagwiritsidwa ntchito kwambiri popanga stearate.
Stearic Acid-829 Stearic acid, Stearic acid ndi mafuta olimba ochokera ku mafuta a nyama ndi ndiwo zamasamba, omwe zigawo zake zazikulu ndi stearic acid (C18H36O2) ndi palmitic acid (C16H32O2).
Chogulitsachi ndi choyera kapena choyera ngati ufa kapena kristalo wolimba, mawonekedwe ake ali ndi kristalo wonyezimira pang'ono wa singano; Chili ndi fungo lochepa lofanana ndi mafuta ndipo sichikoma. Chogulitsachi chimasungunuka mu chloroform kapena diethyl ether, chimasungunuka mu ethanol, sichisungunuka m'madzi. Malo oundana Malo oundana (Appendix Ⅵ D) a chinthuchi sayenera kutsika kuposa 54℃. Mtengo wa ayodini Mtengo wa ayodini wa chinthuchi (Appendix Ⅶ H) supitirira 4. Mtengo wa Asidi (Appendix Ⅶ H) wa chinthuchi umayambira pa 203 mpaka 210. Stearate imakumana mosavuta ndi ma magnesium ndi calcium ions kuti ipange magnesium stearate ndi calcium stearate (white precipitate).
Stearic acid CAS 57-11-4
Dzina la Mankhwala: Stearic acid

CAS: 57-11-4

Tumizani imelo kwa ife

Tsatanetsatane wa Zamalonda

Ma tag a Zamalonda

Mafanizo ofanana

Acidum Stearicum 50; CetylACETIC Acid; FEMA 3035; Carboxylic Acid C18; C18; C18:0 Acid Yamafuta; hystrene5016; hystrene7018

Kugwiritsa ntchito Stearic acid

Stearic acid, (ya mtundu wa mafakitale) Stearic acid ndi imodzi mwa ma asidi ambiri amafuta okhala ndi unyolo wautali omwe amapangidwa ndi mafuta ndi mafuta. Amapezeka m'mafuta a nyama, mafuta ndi mitundu ina ya mafuta a masamba komanso mu mawonekedwe a glycerides. Mafuta awa, pambuyo pa hydrolysis, amapanga stearic acid.
Stearic acid ndi mafuta acid omwe amapezeka kwambiri m'chilengedwe ndipo ali ndi mphamvu zambiri za ma carboxylic acid. Pafupifupi mitundu yonse ya mafuta ndi mafuta ali ndi stearic acid yomwe ili ndi mafuta ambiri m'nyama. Mwachitsanzo, mafuta omwe ali mu batala amatha kufika 24% pomwe mafuta a masamba ndi otsika, mafuta a tiyi ndi 0.8% ndipo mafuta a kanjedza ndi 6%. Komabe, mafuta a koko amatha kufika 34%.

Pali njira ziwiri zazikulu zopangira stearic acid m'mafakitale, zomwe ndi njira yogawa magawo ndi njira yoponderezera. Onjezani chowonjezera chowola mu mafuta a hydrogenated, kenako hydrolyze kuti mupereke crude fatty acid, kenako pitirizani kutsuka ndi madzi, kusungunula, ndi kuyeretsa kuti mupeze zinthu zomalizidwa ndi glycerol ngati chinthu chotsatira.
Opanga ambiri am'nyumba amagwiritsa ntchito mafuta a nyama popanga zinthu. Mitundu ina ya ukadaulo wopanga zinthu imapangitsa kuti mafuta a asidi asamathe kusungunuka, zomwe zimapangitsa kuti azinunkhira bwino panthawi yokonza pulasitiki komanso kutentha kwambiri. Ngakhale kuti fungoli silili ndi poizoni, koma lidzakhudza kwambiri momwe ntchito ikuyendera komanso chilengedwe. Mtundu wambiri wa stearic acid womwe umatumizidwa kunja umatenga mafuta a masamba ngati zopangira, njira zopangira zimakhala zapamwamba kwambiri; stearic acid yomwe imapangidwa imakhala yokhazikika, imakhala ndi mafuta abwino komanso fungo lochepa.
Stearic acid imagwiritsidwa ntchito kwambiri popanga ma stearates monga sodium stearate, magnesium stearate, calcium stearate, lead stearate, aluminium stearate, cadmium stearate, iron stearate, ndi potassium stearate. Sopo imakhala ndi mchere wa sodium kapena potaziyamu. Ngakhale kuti sodium stearate siimatulutsa poizoni wambiri kuposa sodium palmitate, koma kupezeka kwake kungapangitse sopo kukhala wolimba kwambiri.
Tengani batala ngati zinthu zopangira, tsatirani sulfuric acid kapena njira yopanikizika kuti muwole. Mafuta aulere a asidi poyamba ankagwiritsidwa ntchito pochotsa palmitic acid ndi oleic acid pa kutentha kwa 30 ~ 40 ℃, kenako n’kusungunuka mu ethanol, kenako n’kuwonjezera barium acetate kapena magnesium acetate yomwe imayambitsa stearate. Kenako onjezerani sulfuric acid yochepetsedwa kuti mupeze free stearate acid, sefani ndikutenga, ndikuyikanso mu ethanol kuti mupeze pure stearic acid.