P-toluic Acid

1. O ti pese sile nipasẹ ifoyina catalytic ti p-xylene pẹlu afẹfẹ.Nigbati a ba lo ọna titẹ oju aye, xylene ati kobalt naphthenate le ṣe afikun sinu ikoko ifaseyin, ati pe a ṣe afihan afẹfẹ nigbati alapapo si 90 ℃.Awọn iwọn otutu ifaseyin jẹ iṣakoso ni 110-115 ℃ fun bii awọn wakati 24, ati nipa 5% ti p-xylene ti yipada si p-methylbenzoic acid.Tutu si iwọn otutu yara, ṣe àlẹmọ, fọ akara oyinbo àlẹmọ pẹlu p-xylene, ati gbẹ lati gba p-methylbenzoic acid.P-xylene ti wa ni tunlo.Ipese jẹ 30-40%.Nigbati a ba lo ọna ifoyina titẹ, iwọn otutu ifasẹyin jẹ 125 ℃, titẹ jẹ 0.25MPa, oṣuwọn sisan gaasi jẹ 250L ni 1H, ati akoko ifarahan jẹ 6h.Lẹhinna, xylene ti ko ni idahun ti distilled nipasẹ nya si, awọn ohun elo kemikali atẹgun ti jẹ acidified pẹlu hydrochloric acid ogidi si pH 2, rú ati tutu, ati filtered.Àkàrà àlẹ̀ náà ni wọ́n fi p-xylene sí, lẹ́yìn náà ni wọ́n ṣe àyẹ̀wò àti gbígbẹ láti gba p-methylbenzoic acid.Awọn akoonu ti p-methylbenzoic acid jẹ diẹ sii ju 96%.Iwọn iyipada ọna kan ti p-xylene jẹ 40%, ati ikore jẹ 60-70%.

2.O ti pese sile nipasẹ ifoyina ti p-isopropyltoluene pẹlu acid nitric.20% nitric acid ati p-isopropyltoluene ni a dapọ, ru ati kikan si 80-90 ℃ fun 4h, lẹhinna kikan si 90-95 ℃ fun 6h.Itutu, sisẹ, recrystallization ti àlẹmọ akara oyinbo pẹlu toluene lati fun p-methylbenzoic acid ni 50-53% ikore.Ni afikun, p-xylene jẹ oxidized nipasẹ nitric acid ogidi fun awọn wakati 30, ati pe ikore jẹ 58%.