排序方式: 共有36条查询结果,搜索用时 15 毫秒
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马来酸二异辛酯的合成 总被引:4,自引:0,他引:4
用对甲苯磺酸作催化剂。以顺丁烯二酸酐和异辛醇为原料,采用醇化学当量过最的方法制取马来酸二异辛酯。研究了催化剂、温度、醇酐摩尔比、反应时间等条件对反应产率的影响,确定了最佳反应条件,并指出合理的产率应该在98.0%-98.5%. 相似文献
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杂多酸催化合成戊二酸双丁酯 总被引:11,自引:0,他引:11
许胜先 《石油化工高等学校学报》1998,11(2):18-21
以从二羧酸分离出的戊二酸酐和正丁醇为原料,在杂多酸催化作用下酯化合成了戊二酸双丁酯。考察了醇酐摩尔比、反应温度、反应时间、催化剂及用量等因素对酯化反应的影响,确定了较佳的工艺条件:醇酐摩尔比2.5:1,反应温度130℃,反应时间120min,杂多酸用量为体系总质量的0.55%,带水剂甲苯用量为10mL。在此条件下酯化率可达99%以上。利用红外光谱对产品进行了分析。 相似文献
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制备了MCM-41负载戊二酸锌催化剂(ZnGA/MCM-41),并采用热重分析、红外光谱和X射线衍射对催化剂进行了表征。结果表明,ZnGA与载体间存在相互作用,ZnGA能以更小的粒径均匀分散到MCM-41的表面。实验研究表明,该催化剂对于CO2与环氧丙烷(PO)共聚反应显示出较高的催化效率,并得到高分子量的聚碳酸亚丙酯(PPC);通过调节负载量和催化剂的用量,最高催化效率达到了89.5g聚合物/g ZnGA;共聚产物的红外光谱和核磁数据表明,所得共聚产物具有接近完全交替(>97.4%)的碳酸酯结构。 相似文献
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Moonhor Ree Yongtaek Hwang Jong-Seong Kim Hyunchul Kim Gahee Kim Heesoo Kim 《Catalysis Today》2006,115(1-4):134-145
A heterogeneous zinc glutarate (ZnGA) catalyst and its derivatives were prepared from various zinc and glutarate sources. The hydrothermal reaction between zinc perchlorate hexahydrate and glutaronitrile afforded ZnGA single crystals (sc-ZnGA), with a monoclinic lattice unit cell and a P2/c space group, as determined by X-ray single-crystal structural analysis. The structural details of the ZnGA catalyst are crucial in helping to elucidate its activity in the copolymerization reactions between carbon dioxide (CO2) and alkylene oxides. X-ray absorption studies provided direct evidence that CO2 and propylene oxide (PO) are reversibly adsorbed onto the Zn ion centers on the ZnGA surface. Compared to CO2, PO was found to insert more easily into the Zn–O bond of the ZnGA catalyst, suggesting that the ZnGA-catalyzed copolymerization is initiated by PO rather than CO2. The activity of the ZnGA catalyst in the copolymerization of CO2 and PO was found to depend on the zinc source used, and its ability to produce a catalyst of large surface area and high crystallinity (≥77%). Modification of the glutarate ligand with electron-donating or withdrawing substituents failed to enhance the ZnGA catalyst activity further, indicating that glutarate is the best ligand for the Zn metal ion to achieve a high catalytic activity in the CO2 copolymerization with PO. The ZnGA-catalyzed copolymerization was further optimized to maximize the yield of alternating poly(propylene carbonate), and also extended to the terpolymerization of CO2 and PO with δ-valerolactone (VL). Terpolymers with high molecular weights and yields could be obtained by adjusting the PO/VL feed ratios. In addition, the terpolymers were found to exhibit excellent enzymatic and biological degradability. 相似文献
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以从二羧酸中分离出的戊二酸酐和乙醇为原料,用杂多酸为催化剂,合成了戊二酸二乙酯。考察了醇酐摩尔比、反应温度、反应时间、催化剂用量等反应条件对酯化反应的影响,确定了合成戊二酸二乙酯的工艺条件,并对目的产物进行了红外光谱测定,给出了它的一些性能指标 相似文献