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장종산 ( Jong San Chang ),강효윤 ( Hyo Yoon Kang ),황동원 ( Dong Won Hwang ),황영규 ( Young Kyu Hwang ),황진수 ( Jin Soo Hwang ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
A sulfonated activated carbon (AC-SO3H) was used as a solid acid catalyst for dehydration of sorbitol to isosorbide and its catalytic performance was compared with the commercial solid acid such as acidic ion exchange resin, Amberlyst-36, and sulfated copper oxide. The catalytic performance with 100% sorbitol conversion and 52% isosorbide selectivity was obtained over AC-SO3H at 423.15 K. Although AC-SO3H possessed only 0.5 mmol/g of sulfur content, it showed the similar dehydration activity of sorbitol to isosorbide with Amberlyst-36 (5.4 mmol/g) at 423.15 K. Based on the high thermal and chemical stability of AC-SO3H, one-step reactive distillation, where isosorbide separation can be carried out simultaneously with sorbitol dehydration, was tried to increase the recovery yield of isosobide from sorbitol. The reactive distillation process using AC-SO3H, the turnover number of AC-SO3H was 4 times higher than the conventional two-step process using sulfuric acid.