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2-甲基-6-叔丁基苯酚的合成 总被引:1,自引:0,他引:1
以邻甲酚和异丁烯为主要原料,合成2-甲基-6-叔丁基苯酚。考察了反应温度、反应时间和催化剂用量等因素对合成反应的影响。结果表明,合成2-甲基-6-叔丁基苯酚的最佳工艺条件为:常压下,催化剂用量为0.3%(以邻甲酚质量份计),反应温度为110℃,反应时间为3.5h。 相似文献
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以邻硝基甲苯为原料在乙醇钠催化下与草酸二乙酯缩合、水解、双氧水氧化、盐酸酸化得到邻硝基苯乙酸收率为62%。在水溶液中,以FeO(OH)为催化剂,水合肼还原邻硝基苯乙酸得到氧化吲哚。考察了还原过程中影响反应的因素。结果表明,水合肼∶邻硝基苯乙酸=3∶1(摩尔比),催化剂FeO(OH)的用量为0.2 g/mmol邻硝基苯乙酸,溶剂水的用量为5 mL/mmol邻硝基苯乙酸,回流反应1.0 h,氧化吲哚的收率为95%。两步总收率达59%。 相似文献
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仿生催化氧气氧化环己烷合成已二酸反应条件的研究 总被引:3,自引:0,他引:3
以环己烷为原料,氧气为氧化剂,仿生催化剂邻氯铁卟啉为催化剂,一步合成己二酸.考察了反应温度、反应时间、氧气压力、催化剂用量等因素对反应的影响,发现上述因素均对己二酸收率有显著影响,且都有一个最佳的值.催化剂邻氯铁卟啉在该反应中有良好的催化活性,且活性转化数很高.优选的反应条件是反应温度为140℃,氧气压力为2 5 MPa,反应时间为8 h,催化剂用量为1.5 mg.在此条件下,己二酸的质量收率可达21.4%,活性转化数可达24 582. 相似文献
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邻氟苯酚是一种重要的医药和农产化学品的中间体,用于合成杀菌剂、除草剂,也可合成染料液晶、塑料及橡胶的添加剂等。主要以邻氟苯胺为原料,经微通道重氮,水解反应得到邻氟苯酚。系统研究了重氮反应温度、反应停留时间、硫酸用量、亚硝酸钠用量、催化剂、水解温度、水解酸浓度等因素对反应工艺的影响。重氮优化工艺为:硫酸与邻氟苯胺当量为6∶1,亚硝酸钠与邻氟苯胺当量为1.1∶1,重氮反应温度60℃,重氮停留时间32.7 s (持液体积27 m L);水解优化工艺为:水解温度185℃,催化剂硫酸铜用量为原料重量的10%,水解酸浓度40%最佳,最后邻氟苯酚收率可以达到90%。 相似文献
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合成条件对氨催化酚醛树脂结构的影响 总被引:1,自引:0,他引:1
利用红外光谱分析研究了反应温度、时间、催化剂用量,原料配比对合成的氨催化酚醛树脂中的羟甲基含量、邻对位取代比例、醚键含量和残炭率的影响。结果表明,合成条件不同,酚醛树脂中各特征基团含量变化明显,其中,邻对位取代比例变化较大,当氨水用量为4%时,邻、对位取代比值达到1.56。控制反应温度90℃,反应时间130~150 min,催化剂氨的用量3%~4%,甲醛、苯酚物质的量比为1.25时,树脂残炭率可达到49%左右。 相似文献
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以固体光气和邻苯二甲酸为原料,1,2-二氯乙烷作溶剂,DMF为催化剂合成了邻苯二甲酰氯。考察了原料配比、反应温度、溶剂用量、催化剂用量和反应时间对收率的影响。结果表明,当固体光气与邻苯二甲酸摩尔比为1.5∶1,催化剂DMF用量3 mL,反应温度60℃,溶剂1,2-二氯乙烷用量为100 mL,反应时间3.5 h时,合成邻苯二甲酰氯的收率达71.3%,产物纯度为92.4%。利用邻苯二甲酰氯与甲醇的衍生化反应,建立了邻苯二甲酰氯的气相色谱分析方法,并采用外标法对邻苯二甲酰氯进行定量分析,含量为92.4%。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献