A method of making caprolactam from aminohexanoic acid or aminohexanoate ester comprising the steps of: (a) obtaining a reactor containing at least one catalyst, the catalyst being a metal oxide having acid-base-paired active sites; (b) charging a reaction feed into the reactor, the reaction feed containing a reactant, which is either amniohexanoic acid or C1 to C12 alkyl aminohexanoate ester, and a solvent; (c) reacting the reaction feed at a reaction temperature between 140 and 300 °C and a reaction pressure between 10 and 100 atm, to form a product stream; and (d) separating caprolactam from the product stream. The metal oxide catalyst prepared from a process comprising the steps of: (a) dissolving at least a metal salt, which is not a metal oxide, in a solvent to form a metal salt solution, wherein: (i) the metal salt contains a metal element selected from the group consisting of silicon, titanium, tin, barium, calcium, magnesium, aluminium, and zinc, (ii)the solvent is selected from the group consisting of water, alcohol, ether, and mixtures thereof; and (iii)the metal salt is a salt which is soluble in the solvent; (b) adjusting the pH of the metal salt solution to be between 8 and 11, to thereby cause a precipitation of metal hydroxide; and (c) calcining the metal hydroxide at 300 to 1,000°C to form a metal oxide.
一种用
氨基
己酸或
氨基
己酸酯制造己内酰胺的方法,包括以下步骤(a) 获得含有至少一种催化剂的反应器,催化剂为具有酸碱配对活性位点的金属氧化物;(b) 将反应进料装入反应器,反应进料含有反应物,反应物为
氨基
己酸或 C1 至 C12 烷基
氨基
己酸酯和溶剂;(c) 在反应温度为 140 至 300 ℃、反应压力为 10 至 100 atm 的条件下使反应进料反应,形成产物流;(d) 从产物流中分离己内酰胺。金属氧化物催化剂的制备工艺包括以下步骤(a) 将至少一种非金属氧化物的
金属盐溶解在溶剂中,形成
金属盐溶液,其中:(i)
金属盐含有选自
硅、
钛、
锡、
钡、
钙、
镁、铝和
锌组成的组的
金属元素, (ii) 溶剂选自
水、醇、醚及其混合物组成的组;(iii)
金属盐是一种可溶于溶剂的盐; (b) 将
金属盐溶液的 pH 值调至 8 至 11 之间,从而使
金属氢氧化物沉淀;以及 (c) 在 300 至 1,000°C 下煅烧
金属氢氧化物,以形成金属氧化物。