糠醛催化法制四氢呋喃工艺研究

发布时间：2018-04-28 09:19

  本文选题：呋喃 + 四氢呋喃　； 参考：《长春工业大学》2010年硕士论文

【摘要】：糠醛是一种价格低廉、活性较高、取材于植物的化工原料。产物四氢呋喃是工业上一种重要的有机合成原料和优良溶剂。随着应用化学和精细化工的飞速发展,对THF的需求也在不断增长。我国THF年需求量超过万吨,主要依赖进口,且价格呈上升趋势,因此探求THF的最佳生产工艺是当前亟待解决的课题。目前,四氢呋喃的生产主要以石油路线为主,但随着国际上石油危机日益严重,使得该路线的前景不容乐观。而取材于植物的糠醛法制四氢呋喃工艺,既避免了石油短缺问题,又满足了人们对绿色化工的需求。尤其是对于盛产玉米的吉林省来说,有很多的糠醛厂,这使糠醛法生产四氢呋喃项目的研究,具有了深远的意义和广阔的前景。 本文主要研究了糠醛法制四氢呋喃工艺。主要包括两个个部分：糠醛脱羰和呋喃加氢。 第一部分：采用不同浸渍方法制备了一系列不同负载量负载型Pd催化剂,利用XRD、BET、SEM、CO2-TPD等技术手段对催化剂进行了表征,考察了催化剂在糠醛脱羰反应中的催化活性,研究了不同催化剂制备条件对糠醛转化率的影响。实验结果表明,制备得到的0.4%Pd/γ-Al2O3催化剂,在糠醛脱羰制呋喃反应中表现了较高的催化活性。在氢压为0.08MPa反应温度300℃,氢气放空量为20ml/min,催化剂装量为40g时的反应条件下,糠醛转化率转化率约为98%,选择性约为96%。而且通过表征分析表明催化剂中催化剂中钯分布均匀,分散较好,负载后的催化剂存在碱性活性中心。 第二部分：实验中采用了Pd/C催化剂,通过对呋喃加氢正交试验确定了影响加氢工艺的最主要因素为催化剂用量,并对影响加氢工艺条件的实验温度、实验压力、催化剂用量、反应时间、催化剂助剂以及溶剂等因素进行了单因素实验。得到加氢工艺的最佳条件如下： 在反应温度为140℃,反应压力为3MPa,催化剂用量为呋喃的4%(质量比),添加1%(体积比)的三乙胺助剂以及乙醇为溶剂的条件下,转化率达到92%左右,收率达到90.2%
[Abstract]:Furfural is a kind of chemical raw material with low price and high activity. The product tetrahydrofuran is an important organic synthetic raw material and excellent solvent in industry. With the rapid development of applied chemistry and fine chemical industry, the demand for THF is also increasing. The annual demand of THF in China is more than ten thousand tons, mainly depends on imports, and the price is on the rise. Therefore, it is an urgent task to explore the optimal production technology of THF. At present, the production of tetrahydrofuran is mainly based on the oil route, but with the increasingly serious oil crisis in the world, the prospect of this route is not optimistic. The process of preparing tetrahydrofuran from furfural, which is made from plants, not only avoids the problem of oil shortage, but also meets the demand of green chemical industry. There are many furfural plants in Jilin Province, which makes the research of tetrahydrofuran production by furfural method have far-reaching significance and broad prospect. The process of preparing tetrahydrofuran from furfural was studied in this paper. It mainly includes two parts: decarbonylation of furfural and hydrogenation of furan. Part one: a series of supported PD catalysts were prepared by different impregnation methods. The catalysts were characterized by means of XRDX BETX SEMCO2-TPD. The catalytic activity of the catalysts in decarbonylation of furfural was investigated. The effect of different preparation conditions on furfural conversion was studied. The experimental results showed that the prepared 0.4%Pd/ 纬 -Al 2O 3 catalyst exhibited high catalytic activity in the decarbonylation of furfural to furan. The conversion of furfural is about 98 and the selectivity is about 96 under the conditions of 0.08MPa reaction temperature 300 鈩，

本文编号：1814675