共查询到20条相似文献,搜索用时 750 毫秒
1.
TiSiW12O40/TiO2催化合成氯乙酸乙酯 总被引:2,自引:2,他引:0
首次以固载杂多酸盐TiSiW12O40/TiO2为多相催化剂,通过氯乙酸和乙醇反应合成了氯乙酸乙酯,并探讨了诸因素对产率的影响,实验表明:TiSiW12O40/TiO2具有良好的催化活性,醇酸物质的量比为1.4:1,催化剂用量为反应物料总质量的2.0%,反应时间2.0h,反应温度89~96℃,产率可达43.02%。 相似文献
2.
《化学与生物工程》2017,(5)
以蓖麻油酸和乙二醇丁醚为原料,经酯化、酰化两步反应合成了乙酰化蓖麻油酸丁氧基乙酯。运用正交实验与单因素实验确定酯化和酰化反应的最佳条件:酯化反应中,蓖麻油酸与乙二醇丁醚物质的量比为1∶1.15,催化剂一水合硫酸氢钠用量为蓖麻油酸质量的2%,反应时间为5h,反应温度为90℃,蓖麻油酸丁氧基乙酯的酯化率可达98.8%;酰化反应中,蓖麻油酸丁氧基乙酯与醋酐物质的量比为1∶1.2,催化剂对甲苯磺酸用量为蓖麻油酸丁氧基乙酯质量的3%,反应温度为80℃,反应时间为2h,酰化率达93.2%。采用红外光谱(FTIR)、质谱(HRMS)表征并确认了合成产物的化学结构。 相似文献
3.
4.
5.
6.
蓖麻油烷醇酰胺硼酸酯的合成与应用研究 总被引:12,自引:1,他引:11
在氮气保护下,以蓖麻油、二乙醇胺和硼酸为基本原料,合成了蓖麻油烷醇酰胺硼酸酯(RAB) 。RAB是一种新型的抗静电剂,该产品以与聚乙烯的质量比为2 % 添加于聚乙烯(PE) 中,可使PE表面电阻下降到109 Ω,且抗静电持久,对PE抗冲击强度无不良影响。 相似文献
7.
以SnCl4·5H2O/C为催化剂、用乙酸和乙醇为原料,直接酯化合成乙酸乙酯.讨论了醇酸物质的量比、反应温度以及催化剂用量等因素对酯化反应的影响,得出最佳反应条件为催化剂用量为2.5g,乙醇和乙酸的物质的量比为11.5,反应温度为95℃.催化剂重复使用率好,酯的产率高达93.38%. 相似文献
8.
蓖麻油合成生物柴油及其工艺影响因素的考察 总被引:1,自引:0,他引:1
以蓖麻油为原料,在离子液催化作用下与乙醇合成生物柴油,考察了醇油摩尔比、反应温度、反应时间和催化剂用量4个因素对蓖麻油合成生物柴油产率的影响.结果表明,当离子液用量为1.0(wt)%,醇油摩尔比为6:1,反应时间为16min,反应温度为45℃时,生物柴油的产率可以达到90%. 相似文献
9.
首次以固载杂多酸盐TiSiW_(12)O_(40)/TiO_2为多相催化剂,通过氯乙酸和乙醇反应合成了氯乙酸乙酯,并探讨了诸因素对产率的影响。实验表明:TiSiW_(12)O_(40)/TiO_2具有良好的催化活性,醇酸物质的量比为1.4:1,催化剂用量为反应物料总质量的2.0%,反应时间2.0h,反应温度89~96℃,产率可达43.02%。 相似文献
10.
研究以活性炭负载磷钨酸为催化剂合成硬脂酸乙酯,考察了催化剂种类和用量、酸醇物质的量比、反应时间和带水剂对酯化反应的影响。结果表明,在酸醇物质的量比为1:8、催化剂用量1.2 g,为反应物总质量的5.22%(磷钨酸质量分数为1.95%)、带水剂为环己烷、反应温度(80~85)℃和反应时间4 h的条件下,酯化率可达85.57%。 相似文献
11.
我国脂肪酸的生产和应用 总被引:3,自引:0,他引:3
陆蠡珠 《精细与专用化学品》2007,15(1):24-28
简要介绍脂肪酸的分类、原料来源、生产工艺、品种以及用途。并对我国脂肪酸的生产现状进行了分析。重点介绍了脂肪酸在我国橡胶工业中、塑料助剂等领域的应用,脂肪酸甲酯作为表面活性剂在不同领域的广泛应用,最后还简述了癸二酸和改性醇酸树脂应用。 相似文献
12.
酸液体系的研究现状分析和现场应用 总被引:1,自引:0,他引:1
酸化解堵与压裂改造相比,它具有施工相对简单和成本相对较低等特点,所以酸化解堵是一项各油田广泛使用的油气田增产技术。酸化解堵技术已有将近100历史,现已研制出具有不同特点的酸液体系,如乳化酸、泡沫酸、固体酸、多氢酸等,基本能满足复杂地质条件对酸液的要求。 相似文献
13.
介绍了磷钼杂多酸的合成。通过正交试验探讨了反应物料量比、三氧化钼浓度、反应温度和反应时间对产物产率的影响。结果表明,最适宜的反应条件为:反应物量比n(三氧化钼)∶n(磷酸)=12∶1.0、反应温度t=70℃、反应时间7 h、三氧化钼与水的质量比1∶8。经红外光谱分析及熔点测定确定所得产品为磷钼杂多酸化合物。并以磷钼杂多酸取代硫酸作催化剂制备乙酸乙醋来研究其催化活性,并与硫酸做催化剂进行对比实验收率为70.75%,超过硫酸催化剂水平。 相似文献
14.
15.
Claudio Guilherme Portela de Carvalho Luana Fernanda Mazzola Andressa Caldeira Flávio Carlos Dalchiavon José Marcos Gontijo Mandarino 《Journal of the American Oil Chemists' Society》2019,96(7):789-794
The objective of this work was to evaluate the quality of the oil extracted from sunflower achenes grown in Campo Novo de Parecis, the main producing region of Brazil, to optimize its use by the processing and food industries. In addition, the fatty acid profiles of the oil were checked for their adherence to the CODEX STAN 210–1999. Traditional and high-oleic genotypes were grown between 2014 and 2017 during trials with a randomized complete block experimental design with four replications. The contents of oleic, linoleic, palmitic, and stearic acids were determined using gas chromatography. The fatty acid profiles of traditional genotypes were observed to be outside the ranges established by the CODEX, with an oleic acid content above 39.4% and linoleic, palmitic, and stearic acid values lower than 48.3%, 2.7%, and 5.0%, respectively, as well as high-oleic sunflower oil with a stearic acid content of less than 2.6%. The availability of this information can, on the one hand, positively impact industries and encourage the use of better quality raw materials that are more technologically and nutritionally adequate. On the other hand, the commercialization of sunflower oil with a fatty acid profile outside the ranges established by CODEX can be difficult, because the contents are out of specification due to the climatic conditions in the cropping region. 相似文献
17.
P. Sanjeev D. P. Chaudhary P. Sreevastava S. Saha A. Rajenderan J. C. Sekhar G. K. Chikkappa 《Journal of the American Oil Chemists' Society》2014,91(6):1001-1005
Increasing utilization of specialty maize prompted us to evaluate its fatty acid profile. For this purpose maize germplasm, classified as low oil normal maize (group 1), high oil normal maize (group 2), quality protein maize (QPM) (group 3) and sweet corn (group 4) was evaluated for oil, starch, protein and fatty acid composition mainly palmitic, stearic, oleic and linoleic acid. High oil content was observed in sweet corn samples which might be result of shriveled grain texture because of an increased embryo to kernel ratio. Individual fatty acids showed wide differences among different groups. A slightly higher amount of palmitic acid was reported in specialty maize as compared to normal maize. In contrast, stearic acid content was significantly low in high oil normal maize (56 %), QPM (36.2 %) and sweet corn (28.4 %) in comparison to low oil normal maize. Although no significant differences were observed for oleic acid between low oil normal and high oil normal maize, but sweet corn samples showed significantly reduced oleic acid compared to low oil normal maize. However, the most important observation was the higher content of linoleic acid in specialty maize (groups 2, 3 and 4) as compared to low oil normal maize. Further, the ratio of MUFA/PUFA was also discussed. It was concluded that specialty maize possesses a better oil quality in comparison to low oil normal maize. 相似文献
18.
介绍了邻苯二甲酸酐-一缩二乙二醇-丙烯酸酯(简称PA—DEG—AA)的合成方法,通过正交试验分析了合成过程中反应温度、催化剂用量、原料配比、反应时间等因素的影响,并以之为单体配制了一种新型厌氧胶黏剂,测试了胶黏剂的粘结性能。 相似文献
19.