酯

Clean synthesis of diphenyl carbonate by transesterification of phenol and dimethyl carbonate has been studied.

针对苯酚与碳酸二甲酯酯交换法合成碳酸二苯酯洁净催化反应过程进行了较系统的研究。

Reaction thermodynamics of diphenyl carbonate synthesis by the transesterification reaction from dimethyl carbonate and phenol is introduced.

介绍了碳酸二甲酯与苯酚酯交换合成碳酸二苯酯的反应热力学。

There are three methods mainly to synthesize diphenyl carbonate: phosgene method, transesterification and oxidative carbonylation.

碳酸二苯酯的合成方法主要有三种，即光气法、酯交换法和氧化羰基化法。

The results of the experiment show that menadiol sodium diphosphate has no mutation effects on the procaryotic cell in vitro.

结果 当甲萘氢醌二磷酸酯钠的浓度在0.5、5、50、500、5000μg/皿，无论加或不加S9混合物时其对4株沙门菌株的回复突变作用均为阴性。结论甲萘氢醌二磷酸酯钠在体外对原核细胞无诱变作用。

Again, the high-carbohydrate diet was disasterous as it resulted in increased fasting plasma triglyceride levels and very low-density lipoprotein cholesterol levels by 24% and 23% respectively, and increased daylong plasma triglyceride, glucose, and insulin values by 10%, 12%, and 9%, respectively.

再次，高糖饮食是灾难性的，因为它导致在增加空腹血浆甘油三酯水平和极低密度脂蛋白胆固醇水平的24 ％和23 ％，以及增加daylong血浆甘油三酯，血糖，胰岛素值10 ％， 12 ％，九％，分别为。

The affections on the yield of DLLA caused by catalyst, temperature and time etc. were studied. By using ethylene glycol as diluent, the distillate temperature of DLLA was lowed and the carbonization phenomenon could be avoided, which caused the yield of DLLA increasing from 36.8% to 51.3%. The molecular weight of PDLLA prepared by this method could reach 184,000. DLLA and PDLLA was characterized and analyzed by DSC, XRD and IR.The key of direct method to synthesize PDLLA is the exclusion of H2O from reaction system.

丙交酯开环聚合制备PDLLA的关键在于中间体D，L-丙交酯的制备，研究了催化剂、反应温度、反应时间等因素对DLLA产率的影响，通过在反应体系中加入稀释剂乙二醇，DLLA的馏出温度明显降低，避免了DLLA在蒸馏过程中产生碳化现象，并使DLLA的平均产率由36.8％提高至51.3％，制备的PDLLA分子量最大值达18.4万。

Vapor-liquid equilibrium data for maleic anhydride and its absorption solvents are important for developing and researching the MAN production process. Isothermal VLE data for MAN and di-n-butylsebacate binary system at 413.15, 433.15 and 453.15 K were determined with a modified ebulliometer in this work.

利用改进的沸点仪测定了顺酐－癸二酸二丁酯二元体系在413.15，433.15和453.15 K下的等温气液平衡数据以及纯癸二酸二丁酯和顺酐的饱和蒸气压数据。

In this paper, vapor-liquid equilibrium data for the two binary systems maleic anhydride + di-isobutyl hexahydrophthalate and maleic anhydride + di-n-butyl phthalate at different feed compositions at low pressures were measured with a small modified ebulliometer.

本文用改进型沸点仪测定了低压条件下，顺酐和六氢化邻苯二甲酸二异丁酯以及顺酐和邻苯二甲酸二丁酯两个二元系统在不同配料组成下的平衡温度、平衡压力数据。

The processing of glass-reinforced plastic cover for Model 16 Hooker electrolyzer with vinyl ester based unsaturated polyester resin was introduced.

叙述了用乙烯基酯不饱和聚酯树脂制作虎克－16型玻璃钢电解槽盖的施工方法，介绍了乙烯基酯不饱和聚酯树脂的性能。

The emulsoid particle size and its distribution were determined by dynamic laser scattering and TEM. The composition changes of ACR were inspected by IR, and the core-shell structure was observed by TEM.

该共聚物是通过在适度交联的丙烯酸丁酯-丙烯酸2-乙基己酯共聚物乳胶粒外层包裹上一层甲基丙烯酸甲酯-苯乙烯共聚物而形成的。

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。