丁烯

Exxpro specialty elastomers are brominated polymer s derived from a co polymer of isobutylene and paramethylstyrene.

Exxpro特种弹性体是一种溴化聚合物，由异丁烯和对甲基苯乙烯共聚物制得。

Exxpro specialty elastomers are brominated polymers derived from a copolymer of isobutylene and paramethylstyrene.

Exxpro特种弹性体是一种溴化聚合物，由异丁烯和对甲基苯乙烯共聚物制得。

This rubber is isobutylene of pvp-k, complete saturated rubber, So has the extremely good physical and chemical properties, for example have good ozone-resisting aging resistance, oxygen ageing resistance, light ageing resistance, climate aging resistance, the chemical stability and excellent air tightness and water resistance, excellent elasticity and energy absorption performance.

该橡胶是异丁烯的均聚物，无双键，为完全饱和橡胶，所以具有极好物理和化学性能，如，良好的耐臭氧老化性、耐氧老化性、耐气候老化性、较好的化学稳定性、优异的气密性和耐水性，极好的弹性和能量吸收性能。

The physical chemistry properties of catalysts were characterized by ICP,XRD and NH_3-TPD,alkylation of p-cresol with isobutylene over β zeolite modified by Mn and Ce was carried out and the catalytic activity of the zeolite was investigated.

用等离子发射光谱、X射线衍射分析和NH3程序升温脱附(NH3-TPD)表征了改性Hβ沸石的物理化学性质，考察了Mn和Ce改性Hβ沸石对对甲酚-异丁烯烷基化反应的催化性能，并探讨了Mn改性Hβ沸石催化下温度、原料摩尔比和空速对烷基化反应的影响。

The relationship between acid amount of the catalysts and activity of the isomerization of1- betene was linear.

催化剂的酸度与丁烯-1异构化活性呈线性关系。

The syntheses and spectral characteristics of bism-methylbenzene maleate and bis-m-methylbenzene phthalate is reported in this paper.

报道了顺丁烯二酸二间甲苯酯和邻苯二甲酸二间甲苯酯的合成与光谱性质。

An acid formed by oxidation of maleic acid (as in metabolism of fats and carbohydrates).

顺丁烯二酸氧化形成的酸（如在脂肪和碳水化合物的新陈代谢中）。

The main source of benzene in the presence of a catalyst oxidation to form maleic acid, and then derived by isomerization.

其主要来源是在催化剂存在下将苯氧化生成顺丁烯二酸，再经异构化而得。

SCE. The peak height is directly proportional to the concentration of maleic acid over a range of 0.07～50μg/ml.

允许共存顺式与反式丁烯二酸的浓度比为1∶250.20次测量的相对标准偏差为1.1％。

In this paper, the studies on the preparation of high pure mesitylene usingMTBE tail gas are made in both experimental and theoretical, different factorsaffecting the alkylation reaction to produce mesitylene by MTBE tail gas areinvestigated, the optimal condition of reaction is defined and the alkylationreaction kinetics of different components are studied, moreover, the comparisonbetween C4 raffinate oil and isobutene used for alkylation agent is made too.

本文对MTBE尾气烷基化法制备高纯度均三甲苯过程进行了实验研究和理论分析，确定了不同因素对烷基化反应的影响，得到了MTBE尾气制备均三甲苯的最佳反应条件，并对不同组分的烷基化反应动力学进行了研究。此外，对乙烯C4抽余油和异丁烯做为烷化剂的实验结果进行了分析和比较。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。