纳米固体酸催化合成无毒增塑剂柠檬酸三辛酯的研究

Synthesis of Nontoxic Plasticizer Trioctyl Citrate Catalyzed by Nanosolid Acid

以柠檬酸和正辛醇为原料,采用自制的纳米固体酸SO42-/SnO2、SO42-/ZrO2、SO42-/TiO2及SO42-/Fe2O3催化剂合成无毒增塑剂柠檬酸三辛酯(trioctylcitrate,TOC)。分别考察了纳米催化剂种类、催化剂用量、醇/酸物质的量比、反应时间、反应温度等因素对合成TOC反应酯化率的影响,对合成的产品进行红外光谱分析。实验结果表明,自制的固体酸SO42-/SnO2催化合成无毒增塑剂柠檬酸三辛酯的最佳反应条件:催化剂用量为1.0g,酸醇比为1∶6.3,反应时间1.0h,反应温度190℃。在最佳反应条件下,柠檬酸三辛酯的酯化率可达到98.5%。

Nontoxic plasticizer trioctyl citrate was synthesized by using citric acid and octyl alcohol as a raw material and SO4^2- / SnO2, SO4^2- / ZrO2, SO4^2- / TiO2 and SO4^2- / Fe2o3 as catalysts. The effects of types and amounts of nanosolid acid catalysts, alcohol/acid molar ratio, reaction time and reaction temperature on the yield were investigated. The products were analyzed by means of IR spectroscopy. The results showed that the optimum conditions for the synthesis of trioctyl citrate over SO4^2- / SnO2 are catalyst content 1.0g, molar ratio of butanol to citric acid 1 ： 6.3, reaction time 1 h, and reaction temperature 190℃. The yield can be 98.5% in the optimum reaction condition.