异丁醛一步制甲基丙烯酸催化剂的改进

The Improvement of Catalyst of Synthesizing Methacrylic Acid by One-step Oxidation of Isobutylaldchyde

以丙烯羰基合成丁辛醇的副产物异丁醛(IBD)为原料制甲基丙烯酸(MAA)是最经济的工艺路线。我们在异丁酸氧化脱氢制MAA杂多酸催化剂研究的基础上曾开展了IBD一步氧化制MAA的研究,得到IBD转化率100％,MAA单收63％,甲基丙烯醛(MAL)单收10％的结果。本文进一步改进了催化剂,取得了新的进展。

Vibration frequency of the bridge oxygen of heteropoly molybdophosphoric acid has an obvious impact on the oxygen-insertion reaction. In order to improve its catalytic activity, the substitution of As for P in the catalyst was tried. The results show that the catalyst with compositions P1.13Aso. 2 · Mo12V0.25Sb0.25Cu0.25K1.50x has a higher catalytic activity and that a better stability last 600 hours ex-perimentally. The yields of methacrylic acid and methacrolein are 71% and 11. 5% in single-pass reaction, respectively, and the conversion of isobutylaldehylde is 100%. Compared with the results obtained before, the yield of methacrylic acid was raised.