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本文以(2-溴乙基)-苯、咪唑为原料,进行分子间缩合反应,生成1-苯乙基-1H咪唑,使用HPLC跟踪反应,1H NMR确定产物结构,最终产率54. 8%。该工艺无需催化剂,反应条件温和,产率品质稳定。 相似文献
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常温条件下,乙醇作溶剂,以1-苯基-3-甲基-5-吡唑啉酮、芳香醛和芳香胺为原料,在Zn-Tb-MCM-41催化下,通过三组分"一锅法"合成8种新型多苯基氨基吡唑啉酮衍生物,产率为79%~91%。产物通过IR、1HNMR和元素分析确定。该方法具有操作简单、条件温和、产率高、选择性高等特点。 相似文献
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由于煤液化油石脑油馏分(200℃)中芳烃潜含量较高,利用煤液化油石脑油馏分为原料,进行加氢精制,将原料中的硫氮含量降至1 mg/kg左右,满足重整进料要求,然后在小型固定床连续反应器上进行加氢重整生产芳烃试验。着重考察重整反应前、后族组成的变化及主要芳烃化合物的产率。结果表明,加氢重整过程中发生正构烷烃异构化反应;环烷烃主要发生脱氢芳构化反应转化为芳香烃;煤液化油石脑油馏分适宜进行催化重整,C_1~C_4烃气产率6.03%,氢气产率3.60%;重整后,芳烃含量达83.20%,其中C_6~C_8芳烃含量61.03%,是提取BTX的良好原料。石脑油的馏程对芳烃的组成和产率有一定影响,适宜的馏程为60~160℃。 相似文献
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采用水热法分别合成杂多酸H6P2Mo9W9O62及有机金属骨架Zn(BDC) (Bipy)0.5,使用浸渍法合成H6P2Mo9W9O62/Zn(BDC) (Bipy)05复合材料,用该复合材料催化醛、乙酰乙酸乙酯和尿素通过Biginelli反应,乙醇作溶剂,合成6种3,4-二氢嘧啶-2(H)酮衍生物.通过IR、1HNMR、13CNMR确定其结构,通过m.p.确定其纯度.实验结果表明:固定醛用量为0.04 mol,n(醛)∶n(乙酰乙酸乙酯)∶n(尿素)=1∶1.4∶1.5,2.0 wt% H6P2Mo9W9O62/Zn(BDC)(Bipy)0.5,反应温度为105℃,反应时间为60 min时,产物收率为40.1%~91.5%. 相似文献
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以改性Y分子筛、Beta分子筛和无定形硅酸铝为酸性组分,W-Ni为活性金属组分,采用等体积浸渍法制备中油型加氢裂化催化剂。采用XRD、SEM-EDS、BET和XRF等对催化剂进行表征,在200 mL加氢评价装置上评价加氢裂化性能和活性稳定性。结果表明,催化剂具有较强的加氢裂化活性、良好的活性稳定性和中油选择性。在反应压力14.5 MPa、氢油体积比1 500∶1、体积空速1.5 h-1和原料油>370 ℃馏分转化率70%条件下,中油选择性为78.5%,C5+液体收率为98.40%。(65~140) ℃重石脑油芳潜45.06%,(140~370) ℃柴油十六烷值61.2,>370 ℃尾油BMCI值7.6,分别可作为优质的重整装置进料、柴油调和组分及乙烯裂解原料。 相似文献
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A brand new and highly efficient method has been developed for the synthesis of aromatic macrocyclic disulfide oligomers. Cyclization was achieved by cyclo-depolymerization (CDP) of aromatic disulfide polymer in the presence of catalytic amount of thiols and weak base. The cyclic oligomers undergo a facile free-radical ring-opening polymerization to form high molecular weight polymer. Comparing with the conventional method for the preparation of macrocyclic aromatic oligomers by catalytic oxidation of dithiols, highly dilute condition was not necessary using the new method. The macrocyclics in high yield and with narrow molecular weight distribution were obtained. This method also provides a convenient technology for the recycle of aromatic disulfide polymers. 相似文献
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Yingjie Song Shuqi Zhong Yingjiao Li Kun Dong Yong Luo Guangwen Chu Haikui Zou Baochang Sun 《中国化学工程学报》2023,53(1):300-309
As one of the few renewable aromatic resources, the research of depolymerization of lignin into high-value chemicals has attracted extensive attention in recent years. Catalytic wet aerobic oxidation (CWAO) is an effective technology to convert lignin like sodium lignosulfonate (SL), a lignin derivative, into aromatic aldehydes such as vanillin and syringaldehyde. However, how to improve the yield of aromatic aldehyde and conversion efficiency is still a challenge, and many operating conditions that significantly affect the yield of these aromatic compounds have rarely been investigated systematically. In this work, we adopted the stirred tank reactor (STR) for the CWAO process with nano-CuO as catalyst to achieve the conversion of SL into vanillin and syringaldehyde. The effect of operating conditions including reaction time, oxygen partial pressure, reaction temperature, SL concentration, rotational speed, catalyst amount, and NaOH concentration on the yield of single phenolic compound was systematically investigated. The results revealed that all these operating conditions exhibit a significant effect on the aromatic aldehyde yield. Therefore, they should be regulated in an optimal value to obtain high yield of these aldehydes. More importantly, the reaction kinetics of the lignin oxidation was explored. This work could provide basic data for the optimization and design of industrial operation of lignin oxidation. 相似文献
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以芳香胺为原料,室温下,氧气为氧化剂,可见光促进芳香胺合成对称型芳香偶氮类化合物,收率最高可达98%。运用1HNMR和13CNMR对产物进行了结构表征。该方法具有条件温和、高效和清洁等优点。 相似文献
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以联苯和草酰氯为原料,通过傅克酰基化反应合成联苯-4-酮酸乙酯,经碱性水解得联苯-4-酮酸,在双氧水作用下,酮酸发生氧化脱羰基反应得目标产物.对酰化条件进行了优化并详细考察了氧化剂种类、双氧水浓度、物料配比、反应温度和时间对氧化脱羰基反应的影响,确定较佳的工艺条件:10%双氧水作氧化剂,n(联苯-4-酮酸)∶n(双氧水)=1∶2,反应时间为3h,反应温度为0~5℃.在此条件下,联苯-4-甲酸的收率为81.9%(以原料联苯计),纯度为99.5% (HPLC面积归一化法).产物结构经熔点、1HNMR和13CNMR和质谱表征. 相似文献
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Desilication accompanied with minimum loss of crystallinity effect of a high alumina ZSM-5 zeolite on the isomerization reaction of ethylbenzene/xylene mixtures has been considered.Desilication was assessed through XRF,XRD,FTIR,TEM,nitrogen adsorption/desorption,NH_3-TPD,~(29)Si and~(27)Al MAS NMR analytical techniques.Desilication was accompanied with the creation of super acid sites.There exists a limit(Si/Al molar ratio of9.67)for keeping high crystallinity and obtaining improved catalytic performance.Desilication promotes ethylbenzene conversion by disproportionation and trans-alkylation reactions while the same reactions are limited for the xylene isomers.The p-xylene approach to equilibrium improves by more than 7% at 400℃ and a WHSV of 2 h~(-1)for the optimum sample with respect to the parent zeolite.At the same conditions,the optimum sample exhibits the maximum ethylbenzene conversion of 89%,i.e.more than 40%w.r.t.of the parent zeolite.However,the xylene yield decreases only 3%. 相似文献