P-toluic acid

1. A na-akwado ya site na catalytic oxidation nke p-xylene na ikuku.Mgbe a na-eji usoro nrụgide ikuku, xylene na cobalt naphthenate nwere ike ịgbakwunye n'ime ite mmeghachi omume, na ikuku na-ewebata mgbe ikpo ọkụ na 90 ℃.A na-achịkwa okpomọkụ mmeghachi omume na 110-115 ℃ maka ihe dị ka awa 24, na ihe dịka 5% nke p-xylene na-agbanwe na p-methylbenzoic acid.Jụụ ruo n'ime ụlọ, nzacha, sachaa achicha nzacha na p-xylene, wee kpoo ka ị nweta p-methylbenzoic acid.A na-emegharị P-xylene.Mkpụrụ bụ 30-40%.Mgbe a na-eji usoro oxidation nrụgide, mmeghachi omume okpomọkụ bụ 125 ℃, nrụgide bụ 0.25MPa, ọnụego gas bụ 250L na 1H, na oge mmeghachi omume bụ 6h.Mgbe ahụ, uzuoku na-agbaji xylene na-emeghị ihe ọ bụla, a na-etinye acid nke akwụkwọ kemịkal oxygen na acid hydrochloric na pH 2, kpalie ma mee ka ọ dị jụụ, ma kpochaa ya.A na-etinye achicha nzacha ahụ na p-xylene, wee kpochaa ma kpoo ya iji nweta p-methylbenzoic acid.Ọdịnaya nke p-methylbenzoic acid karịrị 96%.Ọnụego ntụgharị otu ụzọ nke p-xylene bụ 40%, na mkpụrụ bụ 60-70%.

2.Ọ kwadoro site oxidation nke p-isopropyltoluene na nitric acid.A na-agwakọta 20% nitric acid na p-isopropyltoluene, kpalitere ma kpoo ọkụ ruo 80-90 ℃ maka 4h, wee kpoo ọkụ na 90-95 ℃ maka 6h.Ịjụ oyi, filtration, recrystallization nke achicha nzacha na toluene iji nye p-methylbenzoic acid na 50-53% mkpụrụ.Na mgbakwunye, p-xylene bụ oxidized site na nitric acid gbadoro anya maka awa 30, mkpụrụ ya bụ 58%.