查询词典 catalyst

The effects of reaction condition and the method of modification onhe alkylation performance of the catalyst were researched.

考察了Hβ沸石及改性后制得催化剂上反应条件及改性方法对反应性能的影响。

Deactivation and regeneration of QZ-2000 catalyst for alkylation of benzene and propylene to synthesize cumene were studied.

对苯和丙烯烷基化反应合成异丙苯的QZ-2000烷基化失活催化剂进行了失活原因及再生条件的研究。

Some advantages of this invention are that it provides desirable catalyst lifetime and activity, minimizes resin swelling, and provides a desirable, sustained selectivity to alkylene glycol.

本发明的优点是，它提供了所希望的催化剂寿命和活性，最大程度地减少了树脂溶胀和提供了理想的、持久的对亚烷基二醇的选择性。

Process comprising contacting initiator with alkylene oxide in the presence of hydrogen fluoride and a double metal cyanide complex catalyst.

一种方法，其包括说明书摘要在氟化氢和双金属氰化物复合催化剂存在下使引发剂与亚烷基氧化物接触。

Quality is the all-important catalyst that makes the difference between success and failure.

品质是决定成功与失败的最重要的因素。

Quality is the all-important catalyst that makes the differ...

品质是决定成功与失败的最重要的因素。

Allantoin was synthesized from glyoxylic ,and urea,which the mixed acid was used as catalyst.

以乙醛酸和尿素为原料，混酸作催化剂合成了尿囊素。

The latter was esterified with allyl alcohol in the presence of the catalyst toluene-p-sulfonic acid to get the title compound in the yield of 87.1%.

后者在对甲苯磺酸催化下与烯丙醇经酯化反应制得标题化合物，收率为87.1%。

At first,the intermediate of sodium 3-chloro-2-hydroxy propanesulfate was synthesized from epichlorohydrin and sodium bisulfite;And then,using NaOH as a catalyst,the title compound has been synthesized from intermediate and allyl alcohol to reach the yield of about 70%.

先由环氧氯丙烷和亚硫酸氢钠合成中间体3-氯-2-羟基丙磺酸钠，然后中间体再与丙烯醇在氢氧化钠催化下生成目标产物2-羟基-3-烯丙氧基丙磺酸钠。

Ce2(SO4)3 was used as an inexpensive and effective catalyst for the Friedel-Crafts alkylation of aromatic compounds with benzyl alcohol s, allyl alcohols and benzyl chlorides.

硫酸亚铈作为一种便宜的和有效的催化剂催化芳香化合物与苄基醇、烯丙醇类化合物和苄基氯的傅-克烷基化反应。

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％。