Methyl Paraben (99-76-3).
Nkọwa ngwaahịa
Methyl paraben, nakwa mEthyl Paraben, otu n'ime parabens, bụ ihe nchekwa na usoro kemịkalụ CH3 (C6H4 (OH) COO). Ọ bụ methyl ester nke p-hydroxybenzoic acid.
Ọdịdị: a ọcha crystalline ntụ ntụ ma ọ bụ crystalline. 115-118 Celsius C na-agbaze ebe, isi ihe na-esi ísì ụtọ, 297-298 ° C. Soluble na ethanol, ethyl ether na acetone, micro-soluble na mmiri, chloroform, carbon disulfide na mmanụ ala ether. Obere isi na ụtọ pụrụ iche, ụtọ dịtụ ilu, Zhuo Ma.
Nkwadebe: p-hydroxybenzoic acid na ethanol na ọnụnọ nke sulfuric acid catalyst maka esterification, esterification na mmiri mgbe ẹkụre crystallization, mgbe ahụ site na nyo, na pickling ngwaahịa.: organic intermediates. Maka ihe nchekwa, onye na-ahụ maka ọgwụ nje, nke a na-eji na nri, ihe ịchọ mma na ọgwụ. A na-ejikwa ya maka nyocha nke organic reagents. Ngwaahịa dị na ebu, yist na nje bacteria nwere mmetụta antibacterial sara mbara, yist na ebu maka ọrụ siri ike, mana ọkachasị maka nje bacteria Gram-negative bacilli na ọrụ Lactobacillus dara ogbenye. Nri na ọgwụ na-echekwa fungicides nke ọma.
Nkọwapụta
| ITEM | Nkọwapụta |
| Ọdịdị | White crystalline ntụ ntụ |
| Ịdị ọcha | >= 99.0% |
| Ebe mgbaze | 125-128 |
| Ihe fọdụrụ na mgbanye | = <0.1% |
| Acidity (mg/g) | 4.0-7.0 |
| Ihe ndị metụtara ya | = <0.5% |
| njirimara | Kwado |
| Dozie ihe ngwọta | doo anya ma doo anya |
| Igwe dị arọ (dị ka Pb) | = < 10 ppm |
