Dehydration of sorbitol to isosorbide over sulfonic acid resins under solvent-free conditions
作者:María José Ginés-Molina、Ramón Moreno-Tost、José Santamaría-González、Pedro Maireles-Torres
DOI:10.1016/j.apcata.2017.03.006
日期:2017.5
Different commercial sulfonic acid resins (Purolite and Amberlyst type) have been evaluated as acid catalysts for the dehydration of sorbitol to isosorbide. These acidic resins differ in their acid properties, as well as in their thermal and mechanical stabilities. Dehydration of sorbitol has been carried out under solvent-free conditions, by melting sorbitol. At the beginning of reaction, different
已经评估了不同的市售磺酸树脂(Purolite和Amberlyst型)作为将山梨醇脱水成异山梨醇的酸催化剂。这些酸性树脂的酸性质以及热和机械稳定性不同。山梨糖醇的脱水已经在无溶剂条件下通过熔融山梨糖醇进行。在反应开始时,检测到不同的脱水山梨糖醇(单水合产物),其脱水和随后的环化作用导致异山梨醇的形成。在大气压下,使用5 wt%的Purolite CT269在413 K下放置12 h后,最大产率达到75%。该树脂在四次运行后仍保持其催化活性,并且通过在反应介质中可忽略不计的硫种类(来自磺酸浸出)的存在来证实其稳定性。-1)以及与大网状结构相关的机械和热稳定性。