本文選題：三聚甲醛 + 離子液體�。� 參考：《蘭州大學(xué)》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(yīng)用于工程塑料和其他化學(xué)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(diǎn),如易腐蝕設(shè)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(guò)程效率低下、能耗較高的劣勢(shì),很多新方法被提出。到目前為止,關(guān)于三聚甲醛合成、分離技術(shù)方面的研究已經(jīng)取得了很大進(jìn)展。近年來(lái),中國(guó)科學(xué)院蘭州化學(xué)物理研究所開(kāi)發(fā)了具有自主知識(shí)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(shù)相比,離子液體合成三聚甲醛技術(shù)是一項(xiàng)清潔合成技術(shù),可減少環(huán)境污染和設(shè)備腐蝕,極大地降低投資,已完成萬(wàn)噸/年工業(yè)化試驗(yàn)。然而,有關(guān)離子液體催化此類反應(yīng)的動(dòng)力學(xué)過(guò)程還未見(jiàn)報(bào)道。此方面研究的空缺,不利于離子液體催化三聚反應(yīng)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(duì)甲醛環(huán)化三聚反應(yīng)的動(dòng)力學(xué)過(guò)程進(jìn)行了研究,通過(guò)考察催化劑結(jié)構(gòu)、催化劑濃度、反應(yīng)物濃度、溫度和壓力對(duì)產(chǎn)物分布的影響,建立動(dòng)力學(xué)模型,獲得了相關(guān)的動(dòng)力學(xué)參數(shù)值,如反應(yīng)速率常數(shù)Ki,活化能Ea和指前因Ai。在合成催化劑基礎(chǔ)上,考察了甲醛羰基化反應(yīng)。研究發(fā)現(xiàn),在一定反應(yīng)條件下反應(yīng),乙醇酸甲酯的收率達(dá)到了97.6%,催化劑和溶劑重復(fù)使用8次,反應(yīng)活性未見(jiàn)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(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TQ317;O643.1

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