|导师||高志贤 ; 吾满江·艾力|
|关键词||双环戊二烯 三环癸烷不饱和单醛 三环癸烷二甲醛 配体效应 溶剂效应|
Dicyclopentadiene (DCPD) mostly comes from both the C5 fraction by-product of ethylenecracking process and light benzene fraction of the coal-coking process. A series of value-added fine chemicals such astricyclodecanedimethylol, tricyclodecanedicarboxylic acid and their polyesterderivatives could be synthesized using DCPD as the starting materialby means of the hydroformylation, followed by hydrogenation. In this thesis, the practical significance and the recent developments of the olefin hydroformylation and its catalysts, the developments of phosphine ligands, the solvent effect were reviewed. The effect of the ligands and solvents on the DCPD hydroformylation were systematically investigated. The mechanism was proposed and discussed. The main results and conclusions are as follows: 1. The magnetic iron oxide supported cobalt and rhodium bimetal catalyst were developed based on the principle of the homogenizing heterogeneous reaction. 2. The ligand effects were investigated with Co-Rh/Fe3O4 as the catalyst, phosphites, triphenylphosphine(PPh3) and its dirivatives were used as the ligands. The results showed that the ligands with electron withdrawing substituents have a significant higher reaction rate, while ligands with electron donating substituents lead to lower reaction rate; but poor selectivity were detected when the reaction was performed at a higher reaction rate. 100% DCPD conversion and 97.0% unsaturated monoformyltricyclodecanes(MFTD) selectivity were achieved with PPh3 as the ligand, which was the best results among the ligands that used in this work. 3. Synthesis of diformyltricyclodecane (DFTD) was carried out by means of one-step method and two-step method. The results indicated that a 99.0% selectivity of total aldehyde could be obtained through the two-step method, which was superior to one step method. 60% DFTD selectivity could be reached with PPh3 as the ligand, which was the best candidate among all the ligands. 4. The effects of different ligands on DCPD hydroformylation reaction were investigated over the cobalt and rhodium bimetallic catalyst modified with various ligands. The results of thermal analysis showed that different decomposition temperature was observed on the catalysts modified with various phosphine ligands. The decomposition temperature denoted the corresponding Rh-P bond strength, and it correlated well with its catalytic performance. Thus, it has been proposed that a weak Rh-P bond was favored to form MFTD with a fast reaction rate, while a relatively stronger Rh-P bond was highly required for the synthesis of DFTD. Besides the PPh3 series, other ligands demonstrated the same rule that a weak Rh-P bond led to a fast reaction rate for MFTD synthesis 5. The effects of solvents on the synthesis of MFTD and DFTD by hydroformylation of DCPD were investigated on the Co-Rh/Fe3O4 catalyst modified with PPh3. The results showed that the polarity of solvent has a significant influence on the reaction rate and the target product selectivity. The reaction rate of MFTD increased with increasing polarity of the solvents. However, the formation rate and selectivity of DFTD increased at first, then decreased with a higher polarity solvent; and a higher DFTD selectivity could be obtained with acetone of 5.4 polarity as the solvent. In additional, a siganificant influence for MFTD synthesis was observed with various polar solvents.
|李娜娜. 双环戊二烯氢甲酰化反应的配体及溶剂效应研究[D]. 北京. 中国科学院大学,2014.|
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