油脂氢化三元金属催化剂制备及性能研究注(II)——制备条件的研究

Study on Property and Preparation of Tri-Metal Catalyst in Hydrogenation of Oils and Fats(Ⅱ) ——Study on Preparing Conditions

本文在金属元素和组成固定的条件下 ,利用正交实验研究了催化剂的制备条件 (沉淀温度A、老化平衡时间B、干燥温度C、加料方式D)对大豆油加氢催化剂活性与选择性的影响 ,发现影响催化剂活性的顺序是D >A >B >C ,影响亚麻酸选择性指数SⅡ 的顺序是A >B >D >C ,亚油酸选择性指数SⅠ 的顺序是B >A >C >D ,其最佳制备条件是沉淀温度 70℃ ,老化平衡时间 4 0min ,干燥温度 1 0 5℃ ,加料方式为并加法。并利用线性回归方法建立了大豆油氢化时亚麻酸与亚油酸的选择性指数SⅡ 和SⅠ 与主要制备条件 (A/K、B/min、C/K)之间的关系 ,即SⅡ =-2 .6386+0 .0 1 0 4A +0 .0 0 55B +0 .0 0 31 33CSⅠ =0 .1 60 7+0 .0 0 0 8A +0 .0 0 1 89B +0 .0 0

Under fixed conditions of metal element and composition,the influences of preparing conditions,precipitating temperature(A),time of precipitating equilibrium(B),drying temperature (vacuum)(C),way of feeding raw materials(D),of catalyst to activation and selectivity were studied.The result shows as follows:the sequence of catalyst activation,D>A>B>C;selective index of linolenate(S Ⅱ),A>B>D>C;linoleat(S Ⅰ),B>A>C>D.The optimum preparing conditions were as follows:precipitating temperature 70℃,time of precipitating equilibrium 40min,drying temperature(vacuum) 105℃,feeding raw materials as same adding.The quantitative relationship among selective index of linolenate(S Ⅱ) and linoleate(S Ⅰ) on hydrogenation of soybean oil and main preparing conditions of catalyst(precipitating temperature,time of precipitating equilibrium and drying temperature was also set up: S Ⅱ =-2.6386+0.0104A+0.00055B+0.003133C S Ⅰ=-0.1607+0.0008A+0.00189B+0.0053C