共查询到17条相似文献,搜索用时 140 毫秒
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制备了含铝5%的负载型AI/SiO2多相催化剂,以其为催化剂,采用改进型无溶剂法工艺合成环氧大豆油。优化工艺条件为:反应时间4h,大豆油:甲酸(85%):H202(30%)=1:0.2:0.92(体积比).催化剂用量为2.0g,反应温度40。60℃,所得产品色泽浅,环氧值高(〉6.5%),产品质量优于国家标准,催化剂可重复使用,再生容易,无腐蚀,对环境友好。 相似文献
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二乙醇胺开环环氧大豆油制备大豆多元醇及其性能表征 总被引:1,自引:0,他引:1
以大豆油、冰乙酸和过氧化氢为原料,硫酸为催化剂,合成了不同环氧值的环氧大豆油。再由合成的环氧大豆油与二乙醇胺在四氟硼酸作催化剂的条件下.通过开环加成反应制备了羟基值分别为261mgKOH/g、285mgKOH/g、312mgKOH/g、340mgKOH/g的4种大豆多元醇。用滴定法测定多元醇羟值,用傅立叶变换红外光谱、差示扫描量热法、热重分析法对多元醇进行了分析和表征。结果表明4种多元醇的熔点和热稳定性都随多元醇羟值增大而增大。 相似文献
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制备了含铝5%的负载型Al/SiO2多相催化剂,以其为催化剂,采用改进型无溶剂法工艺合成环氧大豆油。优化工艺条件为:反应时间4 h,大豆油∶甲酸(85%)∶H2O2(30%)=1∶0.2∶0.92(体积比),催化剂用量为2.0 g,反应温度40~60℃,所得产品色泽浅,环氧值高(>6.5%),产品质量优于国家标准,催化剂可重复使用,再生容易,无腐蚀,对环境友好。 相似文献
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分别以丙烯酸羟乙酯(HEA)、季戊四醇三丙烯酸酯PETA、苯酐(PA)和环氧大豆油(ESO)为原料制备了经丙烯酸酯改性的UV大豆油树脂HEAPA-ESO和PETA-ESO;FFIR和^1HNMR分析确认了目标树脂的结构;综合考察了反应时间、催化剂以及温度对PA和ESO环氧基转化率的影响,最佳工艺条件为:对于HEAPA—ESO,以TPP为催化剂、HEA和PA(1.05:1)在100℃下反应2h,再升温至120℃,然后加入环氧大豆后继续反应5h~6h;对于PETAPA—ESO,以TPP为催化剂、PETA和PA(1.08:1)在110℃下反应2h,再降温至100℃,然后加入环氧大豆后继续反应5h~6h。TPP用量为1.4%,阻聚剂对甲氧基酚(MEHQ)用量为0.15%。 相似文献
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环氧大豆油合成实验研究 总被引:1,自引:0,他引:1
介绍了无溶剂法合成环氧大豆油的原理和生产方法,并通过实验确定了最佳工艺条件:反应温度为60~65 ℃,大豆油∶双氧水∶甲酸为250 mL∶120 mL(31%)∶25 mL(88%),催化剂浓硫酸用量为0.15 mL. 相似文献
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无酸法合成环氧大豆油的研究 总被引:2,自引:0,他引:2
以(-πC5H5NC16H33)3[PO4(WO3)4]作为催化剂,1,2-二氯乙烷为溶剂,H2O2(30%,质量分数)为氧源,在无酸环境下直接合成环氧大豆油,并利用正交实验的方法对大豆油环氧化反应的工艺条件进行优化,得出了最佳反应条件为:n(H2O2)∶n(大豆油双键)=1.25∶1,m(二氯乙烷)∶m(大豆油)=3.5∶1,反应温度70°C,反应时间4 h,产品环氧大豆油的环氧值大于6.2%,碘值小于2.60 gI/100 g,达到一级品要求。催化剂循环使用三次催化活性保持不变。 相似文献
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The lipase Candida antarctica (Novozyme 435) immobilized on acrylic resin was used as an unconventional catalyst for in situ epoxidation of soybean oil. The reactions were carried out in toluene. The peracid used for converting TG double bonds to
oxirane groups was formed by reaction of FFA and hydrogen peroxide. The reaction conditions were optimized by varying the
lipase concentration, solvent concentration, molar ratio of hydrogen peroxide to double bond, oleic acid concentration, and
reaction temperature. The kinetic study showed that 100% conversion of double bonds to epoxides can be obtained after 4 h.
The addition of free acids was not required for the reaction to proceed to conversions exceeding 80%, presumably owing to
generation of FFA by hydrolysis of soybean oil. The enzyme catalyst was found to deteriorate after repeated runs. 相似文献
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本文阐述无味环氧豆油的合成技术,将精制大豆油,乙酸与其它辅料按配方比例投入反应釜,再慢慢滴加双氧水,使之环氧化反应,待反应完全后,经水洗,中和,脱水等一系列工艺,制成无味环氧豆油成品。这种合成方法,工艺简单,产品质量稳定优良。 相似文献
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环氧大豆油增塑剂的合成 总被引:14,自引:0,他引:14
本合成采用无溶剂一步法环氧化工艺,取消了苯作溶剂,用新型催化剂代替硫酸,在稳定剂上用30%双氧水合成的环氧大豆油,环氧值达95%以上。 相似文献
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New materials derived from metathesized soybean oil have been prepared and characterized. Thermal polymerization of metathesized
soybean oil in the presence of air results in yellow, brittle gels. These materials display a curious tendency to produce
audible popping sounds when exposed to chlorinated organic solvents, such as chloroform or dichloromethane. Complete hydrogenation
of metathesized soybean oil has been accomplished in excellent yields utilizing 10% palladium on carbon in dichloromethane.
A new, very mild, effective epoxidation procedure for soybean oil, utilizing methyltrioxorhenium (VII) (MTO) and pyridine
as the catalyst system and hydrogen peroxide as the oxidant, has been developed. This epoxidation reaction affords excellent
yields of epoxidized soybean oil with some control of the degree of epoxidation at very low MTO concentrations (< 0.5 mol%).
This reaction is also very effective for the epoxidation of metathesized soybean oil to higher molecular weight epoxidized
soybean oil materials. 相似文献
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