發(fā)布時間：2018-06-15 02:39

  本文選題：三聚甲醛 + 離子液體　； 參考：《蘭州大學》2014年碩士論文

【摘要】：三聚甲醛是一種性能優(yōu)良的化工原料,廣泛應用于工程塑料和其他化學品中間體。傳統(tǒng)的方法是在酸性催化劑硫酸的作用下合成,此工藝存在著均相催化本身不可避免的缺點,如易腐蝕設備、選擇性差、產(chǎn)物與催化劑難分離等。所以,為改善三聚甲醛生產(chǎn)過程效率低下、能耗較高的劣勢,很多新方法被提出。到目前為止,關于三聚甲醛合成、分離技術方面的研究已經(jīng)取得了很大進展。近年來,中國科學院蘭州化學物理研究所開發(fā)了具有自主知識產(chǎn)權(quán)的離子液體催化劑合成三聚甲醛的方法。與傳統(tǒng)技術相比,離子液體合成三聚甲醛技術是一項清潔合成技術,可減少環(huán)境污染和設備腐蝕,極大地降低投資,已完成萬噸/年工業(yè)化試驗。然而,有關離子液體催化此類反應的動力學過程還未見報道。此方面研究的空缺,不利于離子液體催化三聚反應的控制和工業(yè)化推廣。 本論文主要以多種離子液體為催化劑,對甲醛環(huán)化三聚反應的動力學過程進行了研究,通過考察催化劑結(jié)構(gòu)、催化劑濃度、反應物濃度、溫度和壓力對產(chǎn)物分布的影響,建立動力學模型,獲得了相關的動力學參數(shù)值,如反應速率常數(shù)Ki,活化能Ea和指前因Ai。在合成催化劑基礎上,考察了甲醛羰基化反應。研究發(fā)現(xiàn),在一定反應條件下反應,乙醇酸甲酯的收率達到了97.6%,催化劑和溶劑重復使用8次,反應活性未見明顯下降。
[Abstract]:Triformaldehyde is a kind of chemical raw material with excellent properties, which is widely used in engineering plastics and other chemical intermediates. The traditional method is synthesis under the action of acid catalyst sulfuric acid. This process has the inevitable shortcomings of homogeneous catalysis, such as easy to corrode equipment, poor selectivity, difficult to separate the product from catalyst and so on. Therefore, many new methods have been proposed to improve the low efficiency and high energy consumption of triformaldehyde production process. Up to now, great progress has been made in the synthesis and separation of formaldehyde. In recent years, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, has developed a method for the synthesis of formaldehyde with ionic liquid catalysts with independent intellectual property rights. Compared with the traditional technology, the synthesis of triformaldehyde by ionic liquids is a clean synthesis technology, which can reduce environmental pollution and equipment corrosion, greatly reduce investment, and has completed the industrial test of ten thousand tons per year. However, the kinetics of such reactions catalyzed by ionic liquids has not been reported. The lack of research in this field is not conducive to the control of ionic liquid catalyzed trimerization and industrial popularization. In this paper, the kinetic process of cyclization trimerization of formaldehyde was studied with various ionic liquids as catalyst. The effects of catalyst structure, catalyst concentration, reactant concentration, temperature and pressure on the distribution of the product were investigated. The kinetic model was established and the related kinetic parameters such as reaction rate constant Kia activation energy EA and antecedent Aii were obtained. The carbonylation of formaldehyde was investigated on the basis of synthesis catalyst. It was found that under certain reaction conditions, the yield of methyl glycolate reached 97.6, the catalyst and solvent were reused for 8 times, and the reaction activity was not significantly decreased.
【學位授予單位】：蘭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TQ317;O643.1

【參考文獻】

相關期刊論文 前10條

1 尉志蘋;王少君;曲豐作;;離子液體催化合成乙酸乙酯反應動力學研究[J];大連輕工業(yè)學院學報;2007年01期

2 林春香;詹懷宇;劉明華;付時雨;;纖維素在離子液體中的均相接枝共聚反應動力學研究[J];造紙科學與技術;2009年01期

3 黎子進;黃寶華;張維剛;張q;方巖雄;周蓓蕾;;離子液體[Hnmp]HSO_4催化合成乙酸正丁酯的動力學研究[J];工業(yè)催化;2008年03期

4 黃科林;吳睿;李會泉;曹妍;王金淑;;纖維素在離子液體中均相�；磻獎恿W[J];化工學報;2011年07期

5 孫學文;趙鎖奇;;超臨界條件下離子液體催化苯與丙烯烷基化的反應機理研究[J];化學學報;2008年04期

6 包宗宏;陳曉偉;王秀敏;;離子液體中裂解C_5餾分二烯烴聚合反應動力學[J];化學工程;2008年10期

7 張濤俊;陶端健;周政;吳有庭;張志炳;;離子液體與樹脂催化合成醋酸正丁酯的動力學比較[J];化學工程;2009年12期

8 劉敏;劉大壯;孫培勤;孫紹輝;;離子液體催化氯化聚丙烯與甲苯烷基化反應的研究[J];膠體與聚合物;2005年04期

9 周曉穎,湯志剛,丁立,周榮琪;陽離子交換樹脂作催化劑合成乙酸乙酯的反應動力學[J];清華大學學報(自然科學版);2002年05期

10 葉天旭,張予輝,劉金河,李玉珍;離子液體降低FCC汽油烯烴體積分數(shù)的研究[J];燃料化學學報;2005年02期

，

本文編號：2020209