酯

This apparatus was designed based on summarizing the most synthetic processes of lactide presently.

本文在总结了目前众多聚乳酸单体——丙交酯的合成技术的基础上，选用减压蒸馏工艺并加以改进，设计出最佳的实验装置，使丙交酯的产率从30％提高到45％，并对重结晶后的母液进行有效的回收，回收率也能达到40％，对回收后的丙交酯进行了测试分析，证明了回收过程的可行性。

The cost of lactide is one of the most important factors that hamper the PLA from widely use for a long time. In this paper a series of apparatus which can boost the product ratio to the utmost was focused on. Meanwhile the factors affecting the molecular weight of PLA in the polymerization were also discussed.

长期以来丙交酯的成本一直是制约聚乳酸推广应用的最重要的因素之一，本文致力于设计出一套能最大限度降低丙交酯成本的工艺过程，并对丙交酯聚合过程中影响聚乳酸分子量的因素进行了初步探讨。

This paper reviewed the recent development of synthesis of propyl lactide,discussed the effects of different synthesis techniques and various catalyst system s for the preparation of propyi lactide on the yield and discussed the prospect of propyl lactide synthesis.

介绍了丙交酯合成研究的最新进展，比较了不同催化体系和不同合成工艺对丙交酯收率的影响，并对丙交酯合成的发展前景进行了展望。

Conclusion］ The method has higher sensitivity,accuracy and precision,could be applied to determine the contents of carboxylic ester,lactone and their complexes.

结论］分光光度法具有较高的灵敏度、准确度和精密度，适用于各种酯或内酯及混合酯总量的测定。

Water, Cyclomethicone, Glycerin, Sd Alcohol 40-B (Alcohol Denat.), Propylene Glycol, Melia Azadirachta Leaf Extract, Lecithin, Arctium Lappa Root Extract, Xylitol, Lactitol, Alpha-Glucan Oligosaccharide, Lactoferrin, Potassium Thiocyanate, Glucose Pentaacetate, Glucose Oxidase, Lactoperoxidase, Glycoproteins, Panax Ginseng Root Extract, Equisetum Arvense Extract, Hydrolyzed Milk Protein, Peg-8, Caprylyl Glycol, Sebacic Acid, Sodium Polyacrylate, Betula Alba Bark Extract, Cupressus Sempervirens Leaf Extract, Hamamelis Virginiana Extract, Avena Sativa Meal Extract, Humulus Lupulus Extract, Silk, Nylon-12, Polyacrylamide, Polymethyl Methacrylate, Butylene Glycol, Salicylic Acid, Lauryl Methacrylate/Glycol Dimethacrylate Copolymer, Tocopheryl Acetate, C13-14 Isoparaffin, Laureth-7, Triethanolamine, Xanthan Gum, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Phenoxyethanol, Chlorphenesin, Benzoic Acid, Methylparaben, Fragrance, Titanium Dioxide

水，环甲硅脂，甘油，Sd Alcohol 40-B，丙二醇，印度楝树叶萃取，卵燐脂，牛蒡根萃取，木糖醇，乳糖醇，α-葡低聚糖，乳铁蛋白，硫氰酸钾，葡萄糖五乙酸酯，葡萄糖氧化酶，乳过氧化物酶，糖蛋白，人参根萃取，问荆萃取，水解牛奶蛋白，聚乙二醇-8，辛乙二醇，癸二酸，聚丙烯酸酯钠，白桦萃取，丝柏叶萃取，金缕梅萃取，燕麦萃取，啤酒花萃取，丝，尼龙－12，聚丙烯醯胺，聚甲基丙烯酸甲酯，丁二醇，水杨酸，甲基丙烯酸十二酯，醋酸盐维他命E，C13-14 异烷烃，月桂醇聚醚-7，三乙醇胺，山羊胶，丙烯酸/C10-30烷基丙烯酸聚合物，苯氧乙醇，氯苯甘醚，苯甲酸，羟苯甲酯，香料，二氧化钛

High oil absorption resins of higher n-alkyl acrylates modified cotton linter were synthesizedby supension graft copolymerization. The effects of the ratio of n-alkyl acrylates to linter, the kinds and amounts of crosslinker, the amounts of initiator, as well as reaction temperature and time on oil absorbency were investigated.

以棉短绒为基材，丙烯酸长链酯为单体，双丙烯酸二元醇酯为交联剂，采用悬浮接枝共聚法合成了高吸油性材料，考察了棉纤维与单体的投料比、交联剂种类与用量、引发剂用量、聚合反应温度与时间等因素对该材料吸油性能的影响，得到了不同丙烯酸长链酯与棉纤维接枝聚合制备吸油材料的最佳工艺条件。

There is a lag of 3–5 days between the beginning of spironolactone treatment and the onset of the natriuretic effect.67 Controlled studies have found that spironolactone achieves a better natriuresis and diuresis than a ''loop diuretic'' such as frusemide.68–71 Most frequent side effects of spironolactone in cirrhotics are those related to its antiandrogenic activity, such as decreased libido, impotence, and gynaecomastia in men and menstrual irregularity in women (although most women with ascites do not menstruate anyway).

在应用螺内酯治疗开始和出现尿钠排泄之间会有3-5天的延迟。67对照研究发现螺内酯较绊利尿剂如速尿能取得更好的排钠和利尿效果。68-71螺内酯在肝硬化中大部分常见的副作用与其抗雄激素活性有关，如男性性欲降低，阳萎和男性乳腺发育，而在女性则为月经紊乱（虽然大多数有腹水的女性不来月经）。

In order to obtain the thermodynamic data of the synthesis of ethyl methyl carbonate from dimethyl carbonate and diethyl carbonate, the standard molar enthalpies of formation, Gibbs free energy and molar heat capacity under constant pressure are calculated by the method of Benson group contributions.

为了得到碳酸二甲酯和碳酸二乙酯酯交换合成碳酸甲乙酯反应的热力学数据，用Benson基团贡献法计算了相关物质的标准摩尔生成焓、吉布斯自由能和摩尔定压热容。

Progress of technology, production and application of distilled monoglyceride industry of home and abroad were reviewed.

通过对国内外分子蒸馏单甘酯工业的技术发展、生产和应用状况的简述，分析了下一个世纪我国单甘酯工业的市场前景和面临的挑战，提出了我国单甘酯工业在发展过程中应注意解决的问题。

Deacidification of rice bran oil was studied by using monoglyceride and glycerol blends as an esterification agent and ZnCl2 as a catalyst.

以单甘酯和甘油混合物作酯化剂，ZnCl2为催化剂对米糠油进行化学酯化脱酸研究。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。