摘要
为了提高碳酸二乙酯的转化率与选择性,对二氧化碳和乙醇直接合成碳酸二乙酯的过程进行了研究。确定了较优的催化剂为ZrO2和3A分子筛作为混合催化剂。对催化剂的制备工艺进行了优化:采用正相沉淀方式,沉淀pH值为9,焙烧温度为600℃时制备的ZrO2按质量比为5∶2的比例与3A分子筛进行物理混合后催化效果最佳。在乙醇和二氧化碳的进料比为514/225 mmol下,碳酸二乙酯的产量可以达到0.054 3 mmol,选择性在60%以上。在该催化体系中,加入脱水剂乙烯、环氧丙烷和环氧丁烷均无法达到高效提高反应产率的效果。
The catalyst used in synthesis of diethyl carbonate （DEC）from CO2 and ethanol was studied in order to improve the production and selectivity.The mixture of zirconium oxide （ZrO2 ） and 3 A molecular sieves was selected as the optimal catalyst.The preparation methods of catalysts were also optimized.ZrO2 was obtained by the precipitation method at pH=9 and then calcined at 600 ℃.ZrO2 and 3 A molecular sieves were mixed as the mass ratio of 5∶2.When the feed ratio of CO2 and ethanol was 51 4/225 mmol,the yield of DEC could reach 0.054 3 mmol with the selectivity of more than 60%.In the catalytic system,adding dehydrating agent into the reaction can not efficiently improve the reaction yield.
出处
《化学工程》
CAS
CSCD
北大核心
2014年第6期58-62,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(21106107
21003095
21072152)
天津市自然科学基金资助项目(11JCZDJC24400)
