P-toluic Acid
Mamiriro ezvinhu
Zita remakemikari: P-toluic Acid
Mamwe mazita: 4-methylbenzoic acid
Molecular formula: C8H8O2
molecular uremu:136.15
Sisitimu yenhamba:
CAS: 99-94-5
EINECS : 202-803-3
HS CODE: 29163900
Physical Data
Kuonekwa: kuchena kusvika kuchiedza yellowish crystal powder
Kuchena: ≥99.0% (HPLC）
Kunyungudika: 179-182°C
Poindi yekubikira: 274-275°C
Kunyungudika kwemvura: <0.1 g/100 mL pa19°C
Panopenya: 124.7°C
Mhepo yehutsi: 0.00248mmHg pa25°C
Solubility: inonyungudika nyore mu methanol, ethanol, ether, isinganyunguriki mumvura inopisa.
Kugadzira Nzira
1. Yakagadzirirwa ne catalytic oxidation ye p-xylene nemhepo.Kana iyo yemhepo yekumanikidza nzira inoshandiswa, xylene necobalt naphthenate inogona kuwedzerwa mupoto yekupindura, uye mweya unounzwa pakudziya kusvika 90 ℃.Kupisa kwekuita kunodzorwa pa110-115 ℃ kwemaawa angangoita makumi maviri nemana, uye inenge 5% yep-xylene inoshandurwa kuita p-methylbenzoic acid.Kutonhorera kusvika kukamuri tembiricha, sefa, geza keke resefa nep-xylene, woomesa kuti uwane p-methylbenzoic acid.P-xylene inoshandiswa zvakare.Goho iri 30-40%.Kana iyo nzira yekumanikidza oxidation ichishandiswa, tembiricha yekupindura i125 ℃, kudzvanywa kuri 0.25MPa, gasi kuyerera kuri 250L mu1H, uye nguva yekuita i6h.Zvadaro, iyo xylene isina kubatwa yakanyungudutswa nemhepo, iyo okisijeni bhuku remakemikari rakaiswa acidified neyakaomeswa hydrochloric acid kusvika pH 2, yakamutswa uye yakatonhodzwa, uye yakasefa.Keke resefa rakanyikwa mup-xylene, rozosefa nekuomeswa kuti riwane p-methylbenzoic acid.Zvinyorwa zvep-methylbenzoic acid zvaive zvinopfuura 96%.Nzira imwe chete yekushandura p-xylene yaiva 40%, uye goho raiva 60-70%.
2. Yakagadzirirwa ne oxidation ye p-isopropyltoluene ne nitric acid.20% nitric acid uye p-isopropyltoluene zvakasanganiswa, zvakasimudzwa uye kupiswa kusvika 80-90 ℃ kwe4h, zvozopisa kusvika 90-95 ℃ kwe6h.Kutonhora, kusefa, recrystallization yekeke resefa ine toluene kupa p-methylbenzoic acid mu50-53% goho.Pamusoro pezvo, p-xylene yakaitwa oxidized neconcentrated nitric acid kwe30 h, uye goho raive 58%.
Application
Inogona kushandiswa mukugadzira hemostatic aromatic acid, p-formonitrile, p-toluenesulfonyl chloride, photosensitive materials, organic synthesis intermediates, indasitiri yemishonga yezvipembenene kugadzira fungicide phosphoramide.Inogonawo kushandiswa muzvinonhuwira uye firimu.Nokuda kwekugadzirisa kwe thorium, kuparadzaniswa kwe calcium uye strontium, organic synthesis.Inogonawo kushandiswa sepakati pemushonga, photosensitive material, pesticide uye organic pigment.
