P-toluic acid

1. An shirya shi ta hanyar catalytic oxidation na p-xylene tare da iska.Lokacin da ake amfani da hanyar matsa lamba na yanayi, ana iya ƙara xylene da cobalt naphthenate a cikin tukunyar amsawa, kuma ana shigar da iska lokacin dumama zuwa 90 ℃.Ana sarrafa yawan zafin jiki a 110-115 ℃ na kimanin sa'o'i 24, kuma kusan 5% na p-xylene an canza shi zuwa p-methylbenzoic acid.Sanyi zuwa zafin jiki, tace, wanke kek ɗin tacewa tare da p-xylene, kuma bushe don samun p-methylbenzoic acid.P-xylene ana sake yin fa'ida.Yawan amfanin ƙasa shine 30-40%.Lokacin da matsa lamba hadawan abu da iskar shaka hanya da ake amfani, da dauki zafin jiki ne 125 ℃, da matsa lamba ne 0.25MPa, da gas ya kwarara kudi ne 250L a 1H, da dauki lokaci ne 6h.Sa'an nan kuma, xylene da ba a yi ba, an narkar da shi ta hanyar tururi, littafin sinadarai na oxygen an sanya shi acidified tare da acidic hydrochloric acid zuwa pH 2, motsawa kuma sanyaya, kuma tace.An jiƙa kek ɗin tace a cikin p-xylene, sannan a tace kuma a bushe don samun p-methylbenzoic acid.Abubuwan da ke cikin p-methylbenzoic acid ya fi 96%.Matsakaicin canjin hanya ɗaya na p-xylene shine 40%, kuma yawan amfanin ƙasa shine 60-70%.

2.An shirya ta hanyar hadawan abu da iskar shaka na p-isopropyltoluene tare da nitric acid.20% nitric acid da p-isopropyltoluene aka hade, zuga da mai tsanani zuwa 80-90 ℃ na 4h, sa'an nan mai tsanani zuwa 90-95 ℃ na 6h.sanyaya, tacewa, recrystallization na tace cake tare da toluene don ba da p-methylbenzoic acid a cikin 50-53% yawan amfanin ƙasa.Bugu da ƙari, p-xylene an oxidized ta hanyar nitric acid da aka tattara don 30 h, kuma yawan amfanin ƙasa shine 58%.