摘要
醛类水氧化制酸是一种羧酸类产品生产的新型绿色合成工艺。一步反应中醛加水直接生成乙酸和氢气。分步反应中醛通过歧化得到酯,酯水解得到酸和醇,醇脱氢得到醛,以酯和醇为中间产物,终产物为酸和氢气。对乙醛水氧化反应进行了详尽的热力学计算。讨论了水醛比、温度、压力对热力学平衡时组成的影响,得到了最佳理论反应温度,为600 K。水醛比的增加有利于乙酸的生成,压力的提高有利于乙酸的生成。分步反应中,在水醛比为4,压力为0.1 MPa,温度为600 K条件下,乙醛转化率97.14%,乙酸收率83.37%,乙酸选择性85.82%。
The process of production of acid from aldehyde through hydra-oxidization was new and eco-friendly. In the one-pot synthesis process, acid was obtained directly with aldehyde and water as raw materials; In the indirect synthesis process, acid was obtained through disproportion, hydrolysis and dehydrogenation with alcohol and ester as intermediate products, hydrogen as side product. Thermodynamic calculation was carried out in detail. The effects of temperature, pressure and the ratio of water to acetaldehyde on the equilibrium composition were discussed. The optimal theoretical reaction temperature was determined, about 600 K. With the increase of pressure and the ratio of water to acetaldehyde, the content of acetic acid in the product increased. In the indirect synthesis process, conversion of acetaldehyde was 97.14 %, with yield of acetic acid 83.37 % and selectivity to acetic acid 85.82 % at 0.1 MPa, 600 K and ratio of water to acetaldehyde 4.
出处
《化工时刊》
CAS
2008年第2期6-9,共4页
Chemical Industry Times
关键词
乙酸
乙醛
水氧化
热力学平衡
acetic acid acetaldehyde hydra-oxidization thermodynamic equilibrium
