P-toluic acid
Foromo ea sebopeho
Lebitso la lik'hemik'hale: P-toluic Acid
Mabitso a mang: 4-methylbenzoic acid
Foromo ea molek'hule: C8H8O2
boima ba molek'hule:136.15
Sistimi ea linomoro:
CAS: 99-94-5
EINECS : 202-803-3
HS KHOUTU: 29163900
Boitsebiso ba 'Mele
Ponahalo: phofo ea kristale e tšoeu ho isa ho e mosehla
Bohloeki: ≥99.0% (HPLC）
Sebaka se qhibilihang: 179-182°C
Sebaka se belang: 274-275°C
Ho qhibiliha ha metsi: <0.1 g/100 mL ho 19°C
Sebaka se benyang: 124.7°C
Khatello ea mouoane: 0.00248mmHg ho 25°C
Solubility: Ho qhibiliha ha bonolo ka methanol, ethanol, ether, e ke keng ea qhibiliha metsing a chesang.
Mokhoa oa Tlhahiso
1. E lokiselitsoe ke catalytic oxidation ea p-xylene ka moea.Ha ho sebelisoa mokhoa oa khatello ea sepakapaka, xylene le cobalt naphthenate li ka eketsoa ka pitseng ea karabelo, 'me moea o hlahisoa ha ho futhumala ho 90 ℃.Mocheso oa karabelo o laoloa ho 110-115 ℃ ka lihora tse ka bang 24, 'me hoo e ka bang 5% ea p-xylene e fetoloa ho p-methylbenzoic acid.Pholile ho isa mocheso oa kamore, sefa, hlatsoa kuku e sefang ka p-xylene, 'me u omelle ho fumana p-methylbenzoic acid.P-xylene e sebelisoa hape.Kotulo ke 30-40%.Ha mokhoa oa khatello ea oxidation o sebelisoa, mocheso oa karabelo ke 125 ℃, khatello ke 0.25MPa, sekhahla sa phallo ea khase ke 250L ho 1H, 'me nako ea ho arabela ke 6h.Joale, xylene e sa sebetsanoang e ile ea tšeloa ka mouoane, thepa ea buka ea lik’hemik’hale ea oksijene e ile ea tšeloa asiti ka concentrated hydrochloric acid ho pH 2, ea hlohlelletsoa le ho pholile, ’me ea tlhotloa.Keke ea sefa e ne e kolobisitsoe ka p-xylene, ebe ea tlhotloa le ho omisoa ho fumana p-methylbenzoic acid.Litaba tsa p-methylbenzoic acid li ne li feta 96%.Sekhahla sa phetoho ea tsela e le 'ngoe ea p-xylene e ne e le 40%,' me chai e ne e le 60-70%.
2.E ne e lokiselitsoe ka oxidation ea p-isopropyltoluene le nitric acid.20% nitric acid le p-isopropyltoluene li ne li tsoakoa, li tsosoa le ho futhumatsoa ho 80-90 ℃ bakeng sa 4h, ebe li futhumatsoa ho 90-95 ℃ bakeng sa 6h.Ho pholisa, ho sefa, ho tsosolosa kaka ea filthara ka toluene ho fana ka p-methylbenzoic acid ka lihlahisoa tsa 50-53%.Ho feta moo, p-xylene e ne e oxidized ke concentrated nitric acid bakeng sa 30 h, 'me chai e ne e le 58%.
Kopo
E ka sebelisoa ha ho etsoa hemostatic acid e nkhang hamonate, p-formonitrile, p-toluenesulfonyl chloride, lisebelisoa tsa photosensitive, organic synthesis intermediates, indasteri ea chefo e bolaeang likokoanyana ho hlahisa phosphoramide ea fungicide.E ka boela ea sebelisoa ka litlolo le filimi.Bakeng sa boikemisetso ba bathorium, karohano ea calcium le strontium, organic synthesis.E ka boela ea sebelisoa e le meriana e bohareng, thepa ea lifoto, chefo e bolaeang likokoanyana le organic pigment.
