Methyl Paraben 99-76-3
Khoom Description
Methyl paraben, kuj yog mEthyl Paraben, ib qho ntawm cov parabens, yog ib qho tshuaj tiv thaiv nrog cov tshuaj formula CH3 (C6H4 (OH) COO). Nws yog methyl ester ntawm p-hydroxybenzoic acid.
Xwm: dawb crystalline hmoov los yog crystalline. 115-118 ° C melting point, boiling point, 297-298 ° C. Soluble nyob rau hauv ethanol, ethyl ether thiab acetone, micro-soluble nyob rau hauv dej, chloroform, carbon disulfide thiab roj av ether. Me tshwj xeeb aroma thiab saj, me ntsis iab tsw, Zhuo Ma.
Kev npaj: p-hydroxybenzoic acid thiab ethanol nyob rau hauv lub xub ntiag ntawm sulfuric acid catalyst rau esterification, esterification nyob rau hauv dej tom qab ua tiav ntawm crystallization, ces los ntawm ib tug lim, nyob rau hauv pickling khoom.Siv: organic intermediates. Rau Preservatives, antimicrobial neeg sawv cev, siv nyob rau hauv cov zaub mov, tshuaj pleev ib ce thiab tshuaj. Kuj tseem siv rau kev txheeb xyuas cov organic reagents. Cov khoom ntawm cov pwm, cov poov xab thiab cov kab mob muaj cov kab mob dav dav, cov poov xab thiab pwm ua rau lub luag haujlwm ntawm lub zog, tab sis tshwj xeeb tshaj yog rau cov kab mob Gram-negative bacilli thiab lub luag haujlwm ntawm Lactobacillus tsis zoo. Khoom noj khoom haus thiab tshuaj zoo khaws cia fungicides.
Specification
| Yam khoom | SPECIFICATION |
| Qhov tshwm sim | Dawb crystalline hmoov |
| Purity | > = 99.0% |
| Melting point | 125-128 : kuv |
| Residue ntawm ignition | = <0.1% |
| Acidity (mg / g) | 4.0-7.0 Nws |
| Cov khoom muaj feem xyuam | = <0.5% |
| Kev txheeb xyuas | Ua raws |
| Clarity ntawm kev daws | Ntshiab thiab pob tshab |
| Heavy hlau (raws li Pb) | = <10 ppm |
