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以四氟丙醇和10-十一烯酸为原料,采用直接酯化法合成了10-十一烯酸四氟丙酯(UATE),通过FT-IR和1H NMR对UATE进行了结构表征,考察了反应温度、四氟丙醇用量、催化剂用量、甲苯用量及反应时间5个因素对UATE酯化率的影响。通过响应面实验设计对UATE合成工艺进行优化,确定其最佳合成工艺条件为:n(四氟丙醇)∶n(10-十一烯酸)=3∶1,催化剂浓硫酸用量为0.5%,甲苯用量为7.6 m L,反应时间10 h,反应温度为138℃,在该条件下UATE酯化率最大为78.6%。 相似文献
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11-溴代十一酸的合成研究 总被引:2,自引:0,他引:2
11-溴代十一酸是尼龙 - 11单体的中间体 ,以 10 -十一烯酸和溴化氢为原料合成 11-溴代十一酸 ,通过实验得出了溴代反应的最佳工艺条件为 :引发剂用量 2 % ,溴代温度 0~ 15℃ ,反应时间 1h ,溶剂为甲苯 ,10 -十一烯酸与甲苯的最佳配比 2 0 % ,上述条件下 ,溴代反应的收率达 92 %以上 相似文献
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以十一烯酸甲酯与单乙醇胺反应合成十一烯酸单乙醇酰胺,考察了温度、原料配比、催化剂用量对酰胺化反应的影响,确定了适宜的反应条件。 相似文献
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丙烯酸甲酯水包油型微乳液聚合 总被引:1,自引:0,他引:1
研究了丙烯酸甲酯水包油型微乳液聚合中,引发剂的种类、用量。反应温度、反应时间、乳化剂的不同、乳化剂含量对聚合反应的影响,用偶氮二异丁腈比用过硫酸钾,单体转化率高,引发剂一次加入与分次加入,单体转化率变化不大,引发剂的最佳用量应为单体含量的1%~2%之间;最佳反应温度在60℃左右;反应时间为6h;用反应性乳化剂十一烯酸钠代替十二烷基硫酸钠,同时与十六烷基三甲基溴化铵(CTAB)作比较,发现用反应性乳化剂十一烯酸钠,不论是单体转化率还是聚合产物的稳定性都比其它两者强。用电子透镜观察聚合得到的聚丙烯酸甲酯微乳液乳胶粒,发现用反应性乳化剂十一烯酸钠反应得到的聚合物的颗粒,平均粒径在30mn,分布呈双峰。测得最低成膜温度为10.8℃。 相似文献
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γ—十一内酯的合成研究 总被引:2,自引:0,他引:2
探讨了由ω-十一烯酸制备γ-十一内酯的合成过程中,反应时间和反应温度对产率的影响,找出了较理想的条件:反应时间8h左右,反应温度90℃左右。 相似文献
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11-溴代十一酸是尼龙-11单体的中间体,以10-十一烯酸和溴化氢为原料合成11-溴代十一酸,通过实验得出溴代反应的最佳工艺条件为:引发剂用量2%,溴代温度0-15℃,反应时间1h,溶剂为甲苯,10-十一烯酸与甲苯的最佳配比20%,上述条件下,溴代反应的收率达92%以上。 相似文献
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长链不饱和脂肪酸接枝聚丙烯 总被引:5,自引:0,他引:5
系统地研究了长链不饱和脂肪酸 (十一烯酸 )熔融接枝聚丙烯 (PP) ,探讨了加工条件、引发剂类型与浓度、单体浓度等因素对接枝反应的影响 ,并将结果与短链羧酸丙烯酸 (AA)在PP上的接枝进行比较 ,考察链长因素对接枝的影响。结果表明 ,在DCP、BPO的双重引发下 ,十一烯酸在PP上的熔融接枝是成功的。反应条件对接枝率有一定的影响。和短链羧酸丙烯酸在PP上的接枝相比 ,相同接枝条件下十一烯酸的接枝率较低。DSC测试结果表明 ,十一烯酸接枝前后和丙烯酸接枝前后PP的结晶性能有不同的变化趋势。 相似文献
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本文以高岭土和氢氧化钠为主要原料,在微波辅助下用碱溶法提取氧化铝。研究了微波辅助碱溶法的溶出工艺和溶出性能,并系统讨论了反应阶段反应的微波时间、焙烧温度、微波功率、反应温度、氢氧化钠质量分数以及液固质量比对氧化铝溶出率的影响。通过试验研究,优化出最佳溶出工艺条件为:微波时间120min,焙烧温度450℃,微波功率600w,反应温度85℃,氢氧化钠质量分数为50%,液固质量比为30:1。该条件下氧化铝的溶出率为61.17%。 相似文献
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Ertan Alptekin 《Fuel》2011,90(8):2630-2638
In this study, low cost feedstock chicken fat was used to produce methyl ester. After reducing the free fatty acid level of the chicken fat less than 1%, the transesterification reaction was completed with alkaline catalyst. Potassium hydroxide, sodium hydroxide, potassium methoxide and sodium methoxide were used as catalyst and methanol was used as alcohol for transesterification reactions. The effects of catalyst type, reaction temperature and reaction time on the fuel properties of methyl esters were investigated. The produced chicken fat methyl esters were characterized by determining their viscosity, density, pour point, flash point, acid value, methanol content, heat of combustion value, total-free glycerin, mono-di-tri glycerides, copper strip corrosion and ester yield values. The measured fuel properties of the chicken fat methyl ester met EN 14214 and ASTM D6751 biodiesel specifications when using potassium hydroxide and sodium hydroxide catalysts with high ester yield. 相似文献
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羧甲基瓜尔胶絮凝剂的合成及其絮凝性能研究 总被引:3,自引:0,他引:3
以植物瓜尔胶为原料,采用半干法快速合成了羧甲基瓜尔胶,研究了合成反应温度、氯乙酸量、碱量等因素对其取代度的影响,得到了最佳合成工艺条件:瓜尔胶、氯乙酸、氢氧化钠的质量比为1.6∶1.2∶1,反应温度为70℃,反应时间为1h,室温搅拌20min。在最佳合成条件下,羧甲基瓜尔胶的取代度为0.51,黏度为3960mPa·s,采用红外光谱、热重分析等测试方法分析羧甲基瓜尔胶的结构及热稳定性,并将其应用于微污染水源水的强化处理工艺中,试验结果表明:羧甲基瓜尔胶对浊度的去除率可达90%以上。 相似文献
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Fatty ester Δ-2 heterocycles were prepared in good yields and excellent regioselectivity from 1,3-dipolar cycloaddition reactions between
methyl 10-undecenoate and nitrile oxides. This methodology provides convenient access to the methyl esters of margaric (4b) and stearic (4c) acids in 63–66% yield that contain the isoxazoline heterocycle between C-10 and C-12. These fatty heterocycle compounds
are synthesized in a one-pot sequence in which methyl 10-undecenoate is used to trap the reactive nitrile oxide intermediates
that are generated by reacting aldoximes with aqueous sodium hypochlorite and a catalytic amount of triethylamine or by directly
reacting hydroximic acid chlorides with a stoichiometric amount of base. The fatty ester Δ2-isozazoline heterocycles represent a versatile synthon that may be useful to obtain oleochemicals with potentially new and
interesting properties not easily accessible by other methods. 相似文献
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M. L. Ali M. S. Ahmad Jr. F. Ahmad A. Rauf S. M. Osman 《Journal of the American Oil Chemists' Society》1984,61(8):1354-1357
Addition of iodine azide to methyl 10-undecenoate (1), methyl oleate/elaidate (III,IV) and methyltrans-2-hexadecenoate (VII) yielded methyl 10-azido-11-iodoundecanoate (II, ∼ 100%), methylerythro/threo-9(10)-azido-10(9)-iodooctadecanoate (V,VI) and methylerythro-3-azido-2-iodohexadecanoate (VIII), respectively. The reaction of iodoazide adduct (II) with methanolic KOH yielded 10-azidoundec-10-enic
acid (IX) and 10-oxoundecanic acid (X), while V and VI gave a mixture of 9(10)-oxooctadecanoic acid (XI). Adduct VIII, under
the identical condition after esterification, gave 3 products, methyl 4-methoxy-trans-2-hexadecenoate (XII), 2-oxopentadecane (XIII) and methyl 3-methoxyhexadecanoate (XIV). The unusual behavior of VIII can
be tentatively attributed to the role of adjacent carbonyl on the expected elimination of HI by methanolic alkali. 相似文献
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在微波辐射下,以1,3,5-苯三酚、氯乙酸和氢氧化钠为原料合成了1,3,5-苯三氧乙酸,考察了反应物的摩尔比、微波功率、辐射时间等因素对反应收率的影响。结果表明,当1,3,5-苯三酚、氯乙酸和氢氧化钠的摩尔比为1∶3.4∶5.0,微波功率为400 W,辐射时间为8 min时,1,3,5-苯三氧乙酸的收率为78.3%。 相似文献
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Bing Di Zheng Li Yin Lei Xiaofeng Wang Yanchao Zhu Wei Qi Yumei Tian 《Polymer Engineering and Science》2021,61(5):1463-1475
Lignin, a by-product produced during pulping and papermaking, is a phenol-rich compound with excellent prospect to be used as a substitute for phenol in phenolic resin adhesive. Phenol-enriched hydroxy depolymerized lignin by microwave alkali catalysis is an effective method to prepare high-adhesive biomass composite. This study investigated the microwave digestion of lignin under different conditions of the alkali catalysis (sodium hydroxide) concentration, power, reaction time, and reaction temperature. The results show that on the condition of sodium hydroxide concentration of 0.3 mol/L, temperature of 170 °C, and time of 20 min, the highest phenolic hydroxy content obtained by depolymerization of lignin is 21.68%. SEM shows that the depolymerized lignin has no original basic constituent units and lignin-based phenolic resin has dense uniform pine needle units. Therefore, it has a high bonding strength of 1.934 MPa. The bonding strength and phenol content obtained by the microwave depolymerization method are much higher than those of other modification methods. 相似文献