酸掺杂聚苯胺催化合成丙酸丁酯及动力学

摘要

为实现丙酸与正丁醇酯化合成丙酸丁酯的工业化，研究了对甲苯磺酸掺杂聚苯胺催化合成丙酸丁酯的合成工艺影响因素与动力学．结果表明：当n（正丁醇）n（丙酸）＝2．51，反应时间为3．0h，催化剂用量为反应物总质量的6％，反应温度≤126℃，丙酸转化率为98．39％．催化剂使用7次后，丙酸转化率为77．25％．酯化反应总级数为二级，表观活化能Ea为85．86kJ／mol，指前因子k0为4．95×108 L／（mol· min）．%Esterification reaction of propionic acid with butyl alcohol to N-butyl propionate over PTSA/PANI was investigated to obtain its intrinsic kinetics for industrial scale-up and the better synthesis process. The results showed that,n(butyl alcohol) n(propionic acid)= 2.5 1,PTSA/PANI was 8%of the total mass of propionic acid and butyl alcohol,reaction temperature was lower 126℃,under the condition of reaction of 3.0 h. Conversion rate of propionic acid can reach 98.39%,conversion rate of propionic acid can reach 97.97%after being used 7 times.The synthesis of N-butyl propionate is a second-order reaction on PTSA/PANI,the apparent activation energy of 85.86 kJ/mol,the pre-exponential factor of 4.95×108 L/(mol·min)for PTSA/PANI was obtained.