摘要
筛选了乙醛聚合生成三聚乙醛的催化剂;考察了在不同浓度的盐酸催化下三聚乙醛生成速率与反应时间的关系,研究表明:在盐酸质量分数≥70×10-6、反应温度30℃、反应时间1h条件下,乙醛转化率达69 40%,生成三聚乙醛的选择性接近100%;测量了20～80℃之间乙醛聚合生成三聚乙醛反应的平衡浓度,计算出相应的反应平衡常数,并根据范德霍夫方程求得该反应的反应热为-78 663kJ/mol。
The catalyst for polymerization of acetaldehyde to form paraldehyde has been selected, the correlation between the product generative rate and the reactive time has been studied with various concentration of hydrochloric acid as catalyst. Results showed that the percent conversion of acetaldehyde reaches 69.40% when the hydrochloric acid mass concentration is greater than or equal to 50×10^(-6) and temperature is 30 ℃ as well as time is 1 hour, and selectivity of paraldehyde approaches 100%. The equilibrium concentration of paraldehyde formed by acetaldehyde polymerization has been measured at the temperature of 20～80 ℃ and the relevant equilibrium constant of this reaction has been calculated. Moreover,the reaction heat obtained according to van't Hoff equation through calculation is -78.663 kJ/mol.
出处
《南京工业大学学报（自然科学版）》
CAS
2004年第6期29-32,共4页
Journal of Nanjing Tech University(Natural Science Edition)
基金
扬子石油化工股份有限公司资助
