选择性

In presence of this catalyst,ethanolamine reacted with alkali water at 140-170 ℃ and H2 pressure of 0.8-1.2 MPa.The conversion was over 98% and selectivity for glycine was higher than 95%.

实验结果表明：在温度140170 ℃，H2压力0.81.2 MPa，一乙醇胺与碱水催化反应，其转化率可达98%以上，甘氨酸的选择性高于95%。

A soft-sensing on the rate of non-occupied time and catalyzer selection of process of synthetic acid ethene in a refinery was studied.

以某石化厂乙烯气相法合成醋酸乙烯反应过程的空时得率和催化剂选择性软测量建模为研究对象，基于现场采集数据及机理分析，确定了辅助变量。

Objectives: Through studying the distribution of Sppan acetic ether extract in donor's hearts of rats and its effect on IL-1β in blood, to approach the distribution target ability of sappan in donor's hearts, and its possible immune resist mechanism.

目的：通过研究苏木乙酸乙酯提取物在同种异位心脏移植大鼠供体心脏的分布情况和对小鼠外周血IL-1β活性影响，探讨苏木免疫活性部位在供体心脏分布的选择性及其免疫抑制作用机理。

After methanol is taken out, the research octane number of C5 etherealization product is about 95. The alkene content is less than 35%, the sulfur content is less than 10μg/g and the aromatics content is less than 1%, it is a clean and high quality gasoline component with high octane number.

脱除甲醇后，裂解C5馏分选择性加氢后的醚化产物的研究法辛烷值为95左右，烯烃含量小于35%，硫含量小于10×10^(-6)，芳烃含量小于1%，是一种优质、清洁的高辛烷值汽油组分。

Ii is a process with low investment and great profit to use the C5 etherealization product as the blending component of gasoline with high octane number. The C5 fraction is cut from steam cracking and it's diolefins are saturated by selective hydrogenation.

裂解C5馏分选择性加氢饱和二烯烃后，醚化产物作为高辛烷值汽油调合组分是一条投资少、见效快的工艺路线。

Moreover, their activity and selectivity in etherification reaction is simultaneously estimated and compared.

此外，对这几种催化剂的醚化活性、选择性进行了评价。

This article provided a new route to produce 4-dimethoxy phenethylamine. In basic condition, the product could be obtained through etherization, bromation, Grignard reaction, hydroxyethylation, esterification and Gabriel reaction with phenol as raw material, the overall yield is 45.0%.

提出了合成4-甲氧基苯乙胺的新方法，即在碱性条件下，苯酚首先与硫酸二甲酯反应，再选用高选择性的溴化剂溴化后，经格氏反应、羟乙基化反应和酯化反应，最后经Gabriel反应可以制备目标产物，反应总收率为45.0%。

The separate factor between S--α-phenyl ethylamine and acetophenone for all polymers was above one,and the maximum ofαwas 2.86.This indicated that all polymers had good selection.

各种印迹聚合物对于S--α-苯乙胺及其结构类似物苯乙酮的分离因子均大于1，最大达到2.86，显示出了很好的选择性。

This article investigates the selective hydrogenation of acetylene/ethylene mixtures over Pd-Ag series catalysts. The influence of important variable of hydrogen/acetylene ratio on the product yield pattern is discussed and cokes deposited on catalyst surface after reactions are analyzed.

本文以钯-银系列之触媒，进行乙炔/乙烯混合物之选择性氢化反应，除探讨氢气／乙炔之比例对於产物中乙烷及绿油组成分布之影响，同时说明触媒表面积碳之主要成份。

Particularly,ethylenediamine is an optimal choice for improving the selectivity for cyclohexanone oxime.

在催化剂与硝基环己烷摩尔比为1∶100、反应温度95℃的条件下，反应6h后的硝基环己烷转化率可达100%，环己酮肟选择性可达84.2%。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。