catalyst 雅思GREGMAT

The workers’ demand for better conditions was a catalyst for social change.

工人们要求改善工作条件了社会变革。

It acts as a catalyst in the process of fermentation.

它在发酵过程中起触的作用。

All of these show that the DHT-1 catalyst can be well matched with the hydrodewaxing catalysts.

以上结果表明，DHT-1能与异构降凝剂较好地匹配使用。

A catalyst is a substance which speeds up a chemical reaction.

剂是一种能加速学反应的物质。

Resinification of furfural on the catalyst was the main cause of deactivation.

糠醛树脂结焦是导致剂失活的主要原因。

The research on the amino acid by dehydrogenation alkanolamine(s) in catalyst was recommended.

介绍了国内外醇脱氢制备氨基酸的研究发展情况。

By using phase transfer catalyst, the yield of the preparation of cyclopropane carboxylic isopropyl ester was increased.

在环丙甲酸异丙酯的合成反应中,通过相转移剂提高了反应收率。

Propylene glycol monoether acetate was synthesized using heteropoly acid as catalyst for the firsttime.

首次以杂多酸为剂采用酯法合成丙二醇单乙醚乙酸酯。

Bromooctane was synthesized from industrial hydrobromic acid(48%) and n-octanol using concentrated sulfuric acid as catalyst.

以工业废氢溴酸(48%)为原料,在浓硫酸存在下,与正辛醇行反应合成1-溴辛烷。

N,N-diethylaniline was synthesized under normal tempreture with tetraethyl ammonium hydroxide as phase transfer catalyst.

以苯和溴乙烷为原料,用四乙基氢氧铵作相转移剂,在常压下合成N,N二乙基苯。

CuFe-PILC catalyst was prepared by doping technology during the preparation process of pillaring agent.

在此基础上对其行掺杂改性，获得了铜铁复合层柱粘土剂。

Ethyl lauryl alcohol respectively react with hydrobromic acid to product bromohydrocarbon,sulfuric acid for catalyst。

以正十二醇和氢溴酸为原料,在浓硫酸的下,生产溴十二烷。

Ethylene glycol monoether acetate are synthesized from acetic acid and ethylene glycol monoethyl ether with supported phosphotungstic acid catalyst.

以醋酸和乙二醇单乙醚为原料,活性白土负载磷钨酸作为剂,合成了乙二醇单乙醚醋酸酯。

The synthesis of nerolin bromelia by use of various phase transfer catalysts at different conditionsis studied.

研究了利用多种相转移剂在不同条件下合成橙花素。

The performance of this catalyst for the cross-coupling reaction of iodobenzene with acrylic acid was studied.

研究了该剂对碘代苯与丙烯酸交叉偶联生成反式-肉桂酸的性能。

The best reaction condition are determined when synthesizing dibutyl maleate by using sloid chloride as catalyst.

提出了以固体氯物为剂合成马来酸二丁酯的最佳反应条件。

The fuberidazole was prepared by reaction of O-phenylendiamine with furfural at the presence of CTMABas catalyst.

以邻苯二和糠醛为原料,以十六甲基三烷基溴铵(CTMAB)为剂合成了麦穗宁。

To optimize the process of prepartion isorotenone from rotenone by using Lewis acid AlCl3 as catalyst.

为了优鱼藤酮异构制备异鱼藤酮的工艺。

Nitrodiphenylamine is synthesiized by direct condensing method,adsopting aniline and 2-nitrochlorobenzene as feeds,PEG as phase transfer catalyst.

以苯、邻硝基氯苯为原料,采用直接缩合法引入相转移剂合成邻硝基二苯。

Dibenzyl sulfoxide and dibenzyl sulfone were synthesized from dibenzyl sulfide oxidated with H 2O 2 without catalyst.

在无剂条件下利用过氧氢氧二苄基硫醚合成了二苄基亚砜和二苄基砜。