Y分子筛催化2,3-丁二醇脱水响应面优化  

Response surface optimization for catalytic dehydration of 2,3-butanedinol over Y zeolites

作　　者：章文贵[1] 赵锦波[1] 胡燚[1] 余定华[1] 

机构地区：[1]南京工业大学生物与制药工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2014年第1期39-46,共8页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家高技术研究发展计划(863计划)(2011AA02A207);国家科技支撑计划(2012BAD32B08);国家重点基础研究发展计划(973计划)(2011CB710806);国家自然科学基金(20906051);教育部博士基金(20113221110010)

摘　　要：利用Y分子筛催化生物2,3-丁二醇(BDO)脱水制丁酮(MEK),为丁酮的绿色生产提供了替代工艺。利用Design Expert软件优化了NaY分子筛上脱水反应参数如BDO质量分数、温度、N2及液体流速等,并考察了优化条件下HY、NaY的反应性能。结合热力学分析及NH3-TPD表征揭示了温度、酸特性对反应性能的影响。结果显示:温度对活性影响最为显著,473.15 K下,HY上BDO转化率为97.4%,MEK选择性可达73.6%,但NaY则无活性。HY同等条件下亦呈现高于NaY的异丁醛选择性。酸分析表明该差异归结于HY表面较多强酸及中强酸量。Catalytic dehydration of bio-based 2,3-butanediol （BDO） provided an alternative/green way for butanone （MEK） production.Design-expert was utilized to optimize conditions for dehydration over Y zeolites, such as BDO content, reaction temperature, nitrogen, and input liquid rate. NaY zeolite and HY zeolite were further tested under the optimized conditions. The thermodynamic analysis and NH3-TPD characterization were carried out to reveal the effects of the temperature and acid character on the activity. Results showed that the temperature was the most significant factor affecting the activity. HY zeolite showed an excellent low-temperature activity under the optimized conditions,over which BOO conversion and MEK selectivity reached 97.4% and 73.6% （both zero over NaY） at 473.15 K,respectively.Higher iso-butanal selectivity was superior to NaY under same conditions. According to the NH3-TPD, the excellent low-temperature activity and higher iso-butanal selectivity over HY zeolite were attributed to more medium/high acidic sites over its surface.

关 键 词：2 3-丁二醇 脱水 丁酮 响应面 Y分子筛 

分 类 号：TQ426.94[化学工程]