Approximately 50% of mixed C_4 hydrocarbons produced during FCC process is butene,which is a good feedstock to produce ethylene and propylene,especially propylene.

催化裂化過(guò)程中生產(chǎn)的混合碳4(簡(jiǎn)稱(chēng)為C4)中含有50%左右的丁烯，是很好的制乙烯和丙烯欧美一级高清片，尤其是丙烯的原料亚洲无码黄色在线视频。

By analyzing the mechanism of isobutylene polymerization, a new catalyst for synthesis of highly reactive polyisobutylene from mixed C4 fraction was prepared.

在分析聚異丁烯聚合機(jī)理的基礎(chǔ)上，進(jìn)行了合成高活性聚異丁烯催化劑的研究无码一级毛片一区二区，研制出了一種適用于利用混合碳四合成高活性聚異丁烯的催化劑體系人人干黄色网，并探索了聚合反應(yīng)規(guī)律。

A process for preparing the olefine sulfide includes addition reaction between sulfur monochloride and C3-C12 olefine under existance of low-carbon alcohol as catalyst to obtain addition compound, mixing it with C1-C15 haloalkane, sulfide of alkali metal, sulfur powder, and aqueous solution of emtrol, sulfurizing, dechlorinating, and refining.

一種硫化烯烴的制備方法激情文学网站，包括：(1)使一氯化硫和C 3 ～C 12 烯烴在低碳醇催化劑的存在下進(jìn)行加合反應(yīng)，生成加合物人人操人人做人人骑人人插；(2)將(1)步的加合物與C 1 ～C 15 鹵代烷加勒比官网中文在线、堿金屬硫化物、硫磺粉好男人www好看视频、脂肪醇水溶液混合手机黄色免费小视频一区二区三区，進(jìn)行硫化脫氯反應(yīng)后，精制處理亚洲欧洲日韩视频，得到硫化烯烴產(chǎn)品人妻绿帽子论坛。

Two special structural features of the sulfonium salt were proved to stabilize its corresponding ylide and depress the 2,3-sigma rearrangement. One is that there is a trimethylsilyl in the end of the allylic double band. This silicon atom can stabilize a α-carbon anion and the corresponding ylide. Another is that there is hydroxy group in the beta-position of sulfonium atom. The oxygen of this hydroxy group may stabilize the sulfonium cation.

為了穩(wěn)定生成的烯丙基硫葉立德，并抑制它的2亚洲超碰97人人做人人爱， 3-sigma 重排反應(yīng)在线免费观看你懂得，在硫葉立德結(jié)構(gòu)上做了兩方面的考慮：一是在烯丙基雙鍵的未端引入硅基，利用硅原子對(duì) a -碳負(fù)離子的穩(wěn)定作用來(lái)穩(wěn)定烯丙基硫葉立德色综合aaaaaaaa在线；二是在硫原子的 b -位引入羥基久久这里都有精品，利用羥基氧對(duì)硫正離子的作用來(lái)穩(wěn)定硫葉立德。

Three new ferrocenylmethyl-substituted indenes and cyclopentadienes were synthesized by the addition of hydrogen anion and carbon anion to fulvene and benzofulvene respectively, moreover, their structures were characterized by NMR and MS.

本文以二茂鐵基富烯和二茂鐵基苯并富烯為前體天堂视频www在线，通過(guò)負(fù)氫和負(fù)碳對(duì)雙鍵的加成A片一级黄片免费，合成了3個(gè)新型的二茂鐵基甲基取代的茚及環(huán)戊二烯，并對(duì)其結(jié)構(gòu)進(jìn)行了核磁及質(zhì)譜表征欧美一区精品视频孕妇。

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用過(guò)渡金屬交換的分子篩作為催化劑色色奇米，進(jìn)行催化熱裂解制取乙烯的反應(yīng)，研究發(fā)現(xiàn)91欧美精品自拍网站，在β沸石分子篩和ZSM-5分子篩中引入過(guò)渡金屬后色呦呦视频网站，催化熱裂解反應(yīng)的產(chǎn)物分布與相應(yīng)的氫型分子篩相比有了較大的變化，說(shuō)明過(guò)渡金屬的加入對(duì)于催化熱裂解反應(yīng)的機(jī)理具有影響亚州黄色网，Ⅷ族金屬如Fe四房播色综合久久综合网、Co、Ni和第Ⅰ色色资源站网、Ⅱ副族Cu成年女人爽到高潮的视频免费、Zn表現(xiàn)出較強(qiáng)的氧化脫氫活性A片视屏，產(chǎn)物中氫氣、焦炭的產(chǎn)率很高国产办公室视频在线播放，Ti亚洲欧美一区二区第三页、Cr則未表現(xiàn)出氧化作用：分子篩及催化劑中引入銀后，催化熱裂解反應(yīng)的轉(zhuǎn)化率和乙烯的產(chǎn)率有了提高黄色视频在线的，丙烯產(chǎn)率沒(méi)有很大的變化国产欧美日韩永久，說(shuō)明銀在催化熱裂解反應(yīng)中能夠促進(jìn)正碳離子的生成，又有可能通過(guò)氧化-還原作用部分改變反應(yīng)機(jī)理亚洲欧美日韩精品视频一区，促進(jìn)了自由基的生成国产永久免费看高清视频，并且由于銀對(duì)烯烴的吸附很弱，其氫轉(zhuǎn)移反應(yīng)和脫氫老师性色欧美A在线播放、加氫活性比較低亚洲综合乱伦，有利于烯烴產(chǎn)率的提高。

The structures of three key active constituents are confirmed, and the structure of one main impurity β-caryophyllene is also confirmed; the wrong assignment of 13C-NMR of β-caryophyllene was firstly rectified.

不僅對(duì)欖香烯原料藥的3個(gè)主要活性成分進(jìn)行了結(jié)構(gòu)確證毛片播放网站在线免费，而且對(duì)原料藥中的1個(gè)主要雜質(zhì)成分β-石竹烯進(jìn)行了結(jié)構(gòu)確證3p性A片免费，并首次對(duì)文獻(xiàn)中β-石竹烯碳譜數(shù)據(jù)中有誤的歸屬進(jìn)行了糾正。

All of these products have the carbon-carbon linkage to the cyclopentadiene ring.

由^1H NMR日本永久网站在线观看、IRwww.luanlunshipin、元素分析等確認(rèn)R和環(huán)戊二烯上碳直接相連，具有典型的碳碳連結(jié)在线免费黄色国产剧情网址。

Three new ferrocenylmethyl-substituted indenes and cyclopentadienes were synthesized by the addition of hydrogen anion and carbon anion to fulvene and benzo fulvene respectively, moreover, their structures were characterized by NMR and MS.

本文以二茂鐵基富烯和二茂鐵基苯并富烯為前體高清性色生活片老熟女，通過(guò)負(fù)氫和負(fù)碳對(duì)雙鍵的加成，合成了3個(gè)新型的二茂鐵基甲基取代的茚及環(huán)戊二烯A级在线免费观看，并對(duì)其結(jié)構(gòu)進(jìn)行了核磁及質(zhì)譜表征中日韩人妻人人爽。

Results13 compounds were identified, which accounted for 100 % of the essential oil of the skins of stem. The major compositions were n-Hexadecanoic acid (46.13%); Octadecanoic acid (15.44%),-9-Octadecenoic acid (13.73%), and-9,12-Octadecadienoic acid (7.79%).

結(jié)果通過(guò)計(jì)算機(jī)檢索、圖譜分析法鑒定出13種化合物xxxx69，占總油量的100%免费观看国产强奸视频，其主要成分為正十六烷酸(46.13 %)、十八烯酸(15.44 %)国产在线精品二区、-9-十八烯酸(13.73 %)及-9欧美老人黄色一级视频，12-十八碳二烯酸(7.79 %)。