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二戊酯
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    Synthesis of Dipentyl Maleate by Using Solid Super Acid Catalyst SO_4~(2-)/TiO_2,SO_4~(2-)/ZrO_2
    用固体超强酸SO_4~(2-)/TiO_2、SO_4~(2-)/ZrO_2合成马来酸二戊酯
短句来源
    THE CATALYTIC SYNTHESIS OF DIPENTYL MALEATE BY SO_4~(2-)/TiO _2/La~(3+)RARE-EARTH SOLID SUPERACID
    稀土固体超强酸SO_4~(2-)/TiO_2/La~(3+)催化合成马来酸二戊酯
短句来源
    Solid super acid catalysts,SO_4~(2-)/TiO_2,SO_4~(2-)/ZrO_2 are prepared and used insynthesizing dipentyl maleate.
    合成了 SO_4~(2-)/TiO_2、SO_4~(2-)/ZrO_2固体超强酸,并把它作为催化剂用于马来酸二戊酯的合成,同时与硫酸、对甲苯磺酸的催化效果作了比较。
短句来源
    The standard deviation was 0.064%,and the coefficient of variation was 2.1%,and the average recovery was 96.7%~98.8%.
    (2)5%新戊二醇己二酸聚酯/ChromosorbGAWDM-CS(0.25~0.18mm)的两条色谱柱,邻苯二甲酸二戊酯为内标,氢火焰离子化检测器,标准偏差(SD)≤0.064%,变异系数(CV)≤2.1%,平均回收率为96.7%~98.8%。
短句来源
    The synthesis of dipentyl maleate with 1-pentanol and maleic acid as reactants and rare-earth solid superacid SO 2- 4/TiO 2/La 3+ as catalyst had been studied. The influent actors of reaction were investigated.
    研究了以固体超强酸SO2 -4 /TiO2 /La3+为催化剂 ,马来酸和正戊醇为原料合成马来酸二戊酯 ,并考察了影响反应的因素。
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Solid super acid catalysts,SO_4~(2-)/TiO_2,SO_4~(2-)/ZrO_2 are prepared and used insynthesizing dipentyl maleate.In comparison with sulfuric acid and p-toluenesulfonic acid,the solid super acid catalysts show many advantages:readiness inisolating the products from the catalyst,convenience in treating the products,decrease of waste water,reduction in power consumption,and being much moreeconomical.

合成了 SO_4~(2-)/TiO_2、SO_4~(2-)/ZrO_2固体超强酸,并把它作为催化剂用于马来酸二戊酯的合成,同时与硫酸、对甲苯磺酸的催化效果作了比较。该固体超强酸作催化剂的情况下,催化剂与产品分离容易,产品后处理简单,从而简化了工艺,节约了原材料和能源,减少了废水,优于传统的硫酸、对甲苯磺酸催化剂.

A capillary gas chromatographic method for determination of Di(2-ethylhexyl) phthalate (DEHP) as plasticizer used in plastic paekaging materials for food was developed, (DEHP) was extracted into ether by soxlet extraction or separated from the plastic sample solution by precipitating the plastic matrix with methanol, DEHP was then quantitated on fused silica capillary column, using Di-(2-ethylamyl) phthalate as internal standard and detected by FID, The mean recoveries of DEHP were 96,5% and 85,3% for extracting...

A capillary gas chromatographic method for determination of Di(2-ethylhexyl) phthalate (DEHP) as plasticizer used in plastic paekaging materials for food was developed, (DEHP) was extracted into ether by soxlet extraction or separated from the plastic sample solution by precipitating the plastic matrix with methanol, DEHP was then quantitated on fused silica capillary column, using Di-(2-ethylamyl) phthalate as internal standard and detected by FID, The mean recoveries of DEHP were 96,5% and 85,3% for extracting and precipitating method respectively, The variation coefficients of these two methods were about 2%. The detection limits were about 2x10~(-3) μg.

本文对食品塑膜包装材料中增塑剂邻苯二甲酸二辛酯(DEHP)的气相色谱测定法进行了研究,提出用索氏萃取法以乙醚萃取DEHP或用甲醇沉淀法将塑料基质从试液中除去,分离出DEHP,然后以邻苯二甲酸二戊酯为内标,在交联甲基硅酮毛细管柱上,用FID检测器作气相色谱定量测定。萃取法和沉淀法的平均回收率分别为96.5%和85.3%。两方法的变异系数约为2%,最小检测量约2×10~(-3)μg。沉淀法的回收率略低于萃取法,因此在沉淀过程中,DEHP有被沉淀物包留的可能,若沉淀小心进行,避免产生凝絮状沉淀物则包留现象可获得改善。

Synthesis of dipentyl phthalate using hydrotalcite-containing rare earth as a catalyst is studied in detail,involved influence of amount of the catalyst,mole ratio of phthalic anhydride to n-pentanol,reaction temperature and time on the conversion of phthalic anhydride to dipentyl phthalate. The results show that the catalyst has a high catalytic activity and high selectivity,and the conversion is up to 95%.La content in the catalyst may change in a certain range and the conversion of phthalic anhydride increases...

Synthesis of dipentyl phthalate using hydrotalcite-containing rare earth as a catalyst is studied in detail,involved influence of amount of the catalyst,mole ratio of phthalic anhydride to n-pentanol,reaction temperature and time on the conversion of phthalic anhydride to dipentyl phthalate. The results show that the catalyst has a high catalytic activity and high selectivity,and the conversion is up to 95%.La content in the catalyst may change in a certain range and the conversion of phthalic anhydride increases with increasing of La content.The surface area of the catalyst calcined at 400℃ is about 120 m2/g (BET/N2 technique). It has Lewis and Bronsted acid sites and the amount of Lewis acid is far more than that of Bronsted acid.The mole ratio of chemical composition of the catalyst is Mg:Al:La=6:(2-x):x, where 0≤x≤1.0.

以含镧水滑石作催化剂较详细地研究了邻苯二甲酸二戊酯的合成反应。结果表明:该催化剂具有很高的催化活性,邻苯二甲酸酐的转化率可达95%.分析了催化剂的化学组成范围,并测定了催化剂的表面积及其表面酸性。

 
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