查询词典 propene

It is a new technique to synthesize SAPO 34 molecular sieve using cheap triethylamine (Et 3N) as the template, and the selectivity of this molecular sieve for ethene and propene can be improved further.

采用X射线衍射、扫描电镜、氨吸附红外光谱及核磁共振等表征手段，研究了以氟化氢三乙胺为复合模板剂合成的SAPO 34分子筛。

Methane is used as the selective dehydrating agent for the production of 2,3,3,3-tetrafluoro-l-propene (R1234yf) from 2,2,3,3,3-pentafluoro-l-propanol.

使用甲烷作为选择性脱水剂由2，2，3，3，3-五氟-1-丙醇制备2，3，3，3-四氟-1-丙烯(R1234yf)。

LPG consists principally of the C3/C4 hydrocarbons, propane, propene and butanes, butenes respectively--together with minor proportions of ethane and pentanes.

规范通常将LPG分为三个等级：LPG丙烷、LPG丁烷和LPG混合物，对它们的组成和性质有严格的定义。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。