I-P-toluic Acid

1. Ilungiswa nge-catalytic oxidation ye-p-xylene enomoya.Lapho kusetshenziswa indlela yokucindezela komkhathi, i-xylene ne-cobalt naphthenate ingangezwa ebhodweni lokusabela, futhi umoya wethulwa lapho kushisa ku-90 ℃.Izinga lokushisa lokusabela lilawulwa ku-110-115 ℃ cishe amahora angu-24, futhi cishe u-5% we-p-xylene uguqulelwa ku-p-methylbenzoic acid.Pholisa izinga lokushisa elilingana negumbi, hlunga, geza ikhekhe lokuhlunga nge-p-xylene, bese womisa ukuze uthole i-p-methylbenzoic acid.I-P-xylene igaywa kabusha.Isivuno singama-30-40%.Uma kusetshenziswa indlela ye-pressure oxidation, izinga lokushisa lokusabela lingu-125 ℃, ingcindezi ingu-0.25MPa, izinga lokugeleza kwegesi ngu-250L ku-1H, futhi isikhathi sokuphendula ngu-6h.Khona-ke, i-xylene engaphenduliwe yahlanjululwa ngesitimu, okokusebenza kwencwadi yamakhemikhali omoya-mpilo kwafakwa i-asidi nge-concentrate hydrochloric acid kuya ku-pH 2, yanyakaziswa futhi yapholiswa, futhi yahlungwa.Ikhekhe lokuhlunga lalicwiliswe ku-p-xylene, labe selihlungwa futhi lomiswa ukuze kutholwe i-p-methylbenzoic acid.Okuqukethwe kwe-p-methylbenzoic acid kwakungaphezu kwama-96%.Izinga lokuguqulwa kwendlela eyodwa ye-p-xylene lalingu-40%, futhi isivuno sasingu-60-70%.

2.Yalungiswa nge-oxidation ye-p-isopropyltoluene nge-nitric acid.I-20% ye-nitric acid ne-p-isopropyltoluene yaxutshwa, yanyakaziswa futhi yashiswa yaba ngu-80-90 ℃ amahora angu-4, bese ishisiswa ibe ngu-90-95 ℃ amahora angu-6.Ukupholisa, ukuhlunga, ukuvuselela ikhekhe lokuhlunga nge-toluene ukunikeza i-p-methylbenzoic acid ngesivuno esingu-50-53%.Ngaphezu kwalokho, i-p-xylene yafakwa i-oxidized nge-nitric acid egxilile amahora angu-30, futhi isivuno sasingama-58%.