P-toluic Acid

1. Ua hoomakaukauia e ka catalytic oxidation o p-xylene me ka ea.Ke hoʻohana ʻia ke ʻano kaomi o ka lewa, hiki ke hoʻohui ʻia ka xylene a me ka cobalt naphthenate i loko o ka ipu hao, a hoʻokomo ʻia ka ea i ka wā e hoʻomehana ai i 90 ℃.Mālama ʻia ka mahana hopena ma 110-115 ℃ ma kahi o 24 mau hola, a ma kahi o 5% o ka p-xylene i hoʻololi ʻia i ka waikawa p-methylbenzoic.E hooluolu a hiki i ka lumi wela, e kānana, e holoi i ka keke kānana me ka p-xylene, a maloʻo e loaʻa ai ka waika p-methylbenzoic.Hoʻohana hou ʻia ʻo P-xylene.ʻO 30-40% ka hua.Ke hoʻohana ʻia ke ʻano o ka hoʻoneʻe ʻana, ʻo 125 ℃ ka wela o ka hopena, ʻo 0.25MPa ke kaomi, ʻo 250L ke kahe o ke kinoea i 1H, a ʻo ka manawa pane he 6h.A laila, ua hoʻoheheʻe ʻia ka xylene unreacted e ka mahu, ua hoʻokaʻawale ʻia ka mea puke kemika oxygen me ka waika hydrochloric concentrated i ka pH 2, hoʻoulu ʻia a hoʻomaha, a kānana.Hoʻomoʻu ʻia ka keke kānana i loko o ka p-xylene, a laila kānana a maloʻo no ka loaʻa ʻana o ka p-methylbenzoic acid.ʻOi aku ka nui o ka p-methylbenzoic acid ma mua o 96%.ʻO ka hoʻololi hoʻololi hoʻokahi ala o p-xylene he 40%, a he 60-70% ka hua.

2.Ua hoomakaukau ia e ka oxidation o p-isopropyltoluene me nitric acid.20% nitric acid a me p-isopropyltoluene i hui pū ʻia, hoʻoulu ʻia a hoʻomehana ʻia i 80-90 ℃ no 4h, a laila wela i 90-95 ℃ no 6h.ʻO ka hoʻoluʻu, kānana, recrystallization o ka kānana keke me ka toluene e hāʻawi i ka p-methylbenzoic acid i ka 50-53% yield.Eia hou, p-xylene ua oxidized e ka nitric acid concentrated no 30 h, a o ka hua he 58%.