丙烯二聚制4-甲基戊烯-1

以丙烯为原料,采用碱金属系催化剂在固定床中进行丙烯二聚连续反应,制备4-甲基戊烯-1。分别考察了载体组成、金属钠钾比以及负载量,合成的工艺条件对反应的影响。经800小时的连续运转试验表明,该催化剂具有良好的稳定性。     

4—甲基—1—戊烯

4-甲基-1-戊烯(4MP1)作为共聚单体,可生产出性能优良的LLDPE树脂。本文叙述了国外几种合成4MP1的技术路线,选择优化适合我国的生产方法,即丙烯在碱金属催化剂的作用下二聚生成4MP1,反应温度120～170℃,反应压力45.4～181.4MPa,重量空速(WHSV)1～4,反应过程的4MP1选择性大于80％,4MP1/4MP2大于20。     

4-甲基-1-戊烯的合成技术

4-甲基-1-戊烯(4MP1)作为共聚单体,可生产出性能优良的线型低密度聚乙烯LLDPE树脂。本文叙述了国外几种合成4MP1的技术路线,选择优化适合我国的生产方法,即丙烯在碱金属催化剂的作用下二聚生成4MP1,反应温度120-170℃,反应压力45.4-181.4MPa,反应过程的4MP1选择性大于80%,4MP1/4MP2大于20。     

聚4-甲基-1-戊烯的研究进展及应用

综述了聚4-甲基-1-戊烯(PMP)的生产工艺和国内外4-甲基-1-戊烯聚合催化剂的研究进展,介绍了PMP的性能及应用,并对我国PMP合成技术存在的问题及发展方向提出了建议.     

聚4-甲基-1-戊烯的结构与性能

通过红外光谱、差示扫描量热、力学性能与耐热性能、透光率和动态力学性能测试等测试分析考察了聚4-甲基-1-戊烯(PMP)的结构与性能,并与几种传统工程材料进行对比分析。结果表明:PMP是一种具有优异的透光性和耐热性,且在力学性能、电性能和加工性能方面表现优良的新型聚烯烃树脂。     

聚4-甲基-1-戊烯树脂的加工流变性与热稳定性

利用旋转流变仪和热失重分析仪对聚4-甲基-1-戊烯(PMP)的加工流变性和热稳定性进行了研究.结果表明:PMP的加工性能与均聚聚丙烯(PP)较为接近,但其熔点为236℃,其加工温度高于PP.PMP熔体为典型的假塑性流体,其非牛顿指数为0.2,对剪切速率敏感;同时PMP黏流活化能(83.00 kJ/mol)比PP的高,表...     

聚4-甲基戊烯-1(TPX)的加工和应用

聚4-甲基戊烯-1(TPX)众多的优良性能为其广泛应用奠定了很好的基础。本文重点介绍了TPX的常用加工方法,如注塑成型、挤出成型和吹塑成型等;并综述了TPX在医疗器械、电子电器、包装材料、微孔材料、共混改性等方面的应用。     

聚4-甲基-1-戊烯的合成、结构与应用研究进展

从聚4-甲基-1-戊烯（PMP）的单体、催化剂、合成、分子链结构、晶体结构以及结晶行为进行阐述,综述了其在电子电器、节能降耗、包装材料以及医疗器械等领域的最新应用。PMP的合成包括丙烯二聚合成单体4-甲基-1-戊烯及其聚合。PMP合成技术有两种：一种是采用Ziegler-Natta催化剂的配位聚合,使用的主催化剂为Ti X(X表示卤素原子),助催化剂为烷基铝;第二种是阳离子聚合。最后对PMP性能优化以及国产化提出展望。     

The catalytic characteristic and synthesis technique for 4-methyl-1-pentene over a potassium-supported superbase catalyst

The dimerization of propene to 4-methyl-1-pentene (4MP1) was studied in a fixed-bed reactor at 150?°C temperature, 8?MPa pressure, and 1?h^?1 liquid hourly space velocity (LHSV) in the presence of solid superbase with 20?wt% one-pass conversion to hexene and 88% selectivity toward 4MP1. Based on the reaction results, propene competes with 4MP1 for adsorption on the catalyst surface. A higher reaction pressure or a lower liquid rate of 4MP1, controlled by a suitable propene LHSV or reaction temperature, was beneficial to the adsorption of propene, which reduced the isomerization of 4MP1. Under optimized conditions, propene dimerization was stable for 200?h, and isomerization was limited to less than 5%, yielding products with about 19% one-pass conversion to hexene by weight and 87% selectivity toward 4MP1.     

An unusual branching in single crystals of isotactic poly(4-methyl-1-pentene)

Single crystals of low M_w poly(4-methyl-1-pentene) (P4MP1) in its form I display an unusual streaking of their diffraction pattern. The crystals also frequently give rise to composite diffraction patterns made of two patterns rotated by 37°. The streaking indicates a structural disorder, namely a shift of nearby layers along the a or b axis by one quarter of the unit-cell edge. The daughter crystals, rotated by 37°, are produced on the edges of the parent crystals via an epitaxial growth that is a direct consequence of the structural disorder.     

Effect of several dual solvents on the phase separation of poly(4-methyl-1-pentene)

Phase separation of isotactic poly(4-methyl-1-pentene) (PMP) from various solvents gives polymer masses which can be converted into foams that vary from crumbly powders to well-connected, strong, flexible solids. The composition of the solvent is an important parameter in determining the nature of the separated polymer phase. The influence of solvent (or non-solvent) on the temperature and character of the phase separation event and on the resulting foam structure is addressed in this paper. Thus differing ratios of two poor solvents for PMP, bibenzyl and paraffin, were found to give variable foam structures and surprising phase behaviour. Thermochromism is sometimes observed as the polymer separates.     

4-醛基-4-戊烯腈的气相色谱分析

采用气相色谱法,以OV-225为固定液,正十五烷为内标物测定4-醛基-4-戊烯腈含量,方法标准偏差为0.12%,变异系数为0.43%,平均回收率为100.5%,相关系数0.999 6。     

5,5,5-三苯基-1,2-环氧戊烷的合成

以三苯基甲基氯为原料,采用环氧化合物取代法经3步反应得到标题化合物,产率61%。探讨了影响反应的多种因素,并找到了较好的合成条件。     

Experiment and a catalyst acid property-included global reaction modeling for catalytic pyrolysis of 1-pentene

The acid property of the catalyst is usually one of the most important parameters for the selection and design of catalysts for catalytic pyrolysis of 1-pentene. Here, seven catalysts with similar pore properties and different acid properties were evaluated and characterized in terms of three key properties: Total acid amount (TA), Brønsted to Lewis acid ratio (B/L), and strong to weak acid ratio (S/W). A database of the stoichiometric coefficients of 26 pyrolysis products was constructed. Then, a novel catalyst acid property-included global reaction modeling method was developed, which was used to predict the yields of the 26 pyrolysis products. Besides, a suitable range of TA, B/L, and S/W was obtained for enhancing ethylene and propylene. The model thus can predict the product composition, and be used for the design and selection of the acid properties of catalysts. This simulation method can also be extended to other hydrocarbon systems.     

Process for production of pure 4-methyl-1-pentene

A process for the manufacture of pure 4-methyl-1-pentene by catalytic dimerization of propylene has been developed in three stages. The first stage involves preparation of a new process catalyst, which contains metallic sodium and potassium deposited on a Bulgarian natural zeolite, the support having been passivated previously by potassium carbonate. The experimental results demonstrate the advantages of the resulting catalyst over exisisting technology, namely 36% conversion and 92% selectivity relevant to liquid isomers. The second development stage concerns the technological regime of chemical reaction for production of 4-methyl-1-pentene. In the third stage, the regime conditions and equipment ensuring desired quality of the product and utilization of the unreacted propylene returned to the reactor are determined. Based on the studies of all stages, a flowsheet is proposed for synthesis and separation of the reaction mixture of isomeric hexenes to give pure 4-methyl-1-pentene.