共查询到18条相似文献,搜索用时 78 毫秒
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简要介绍了丁二烯的物化性质,系统总结了丁二烯及其自聚物可能产生的各种危险性,简要分析了丁二烯自聚物的产生条件,列举了丁二烯造成危害的典型案例,并详细总结了丁二烯自聚物危险性的防范措施. 相似文献
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影响丁二烯装置长周期运行的最大隐患就是丁二烯聚合物,因此分析了丁二烯的化学性质及自聚的危险性,并针对丁二烯生产工艺特点,提出了防止丁二烯自聚的几点工艺优化措施,保障了丁二烯装置长周期安全平稳运行。 相似文献
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简要介绍了丁二烯的物化性质及公司丁二烯储存现状,系统归纳了丁二烯及其自聚物的各种危险性,对丁二烯高分子聚合物的生成条件进行了简要分析。最后总结归纳了安全清理丁二烯储罐内形成的过氧化物方案。 相似文献
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随着现代石化行业的高速发展,丁二烯产品成为石油化工领域的重要中间产品,作为一种重要的化工原料,可作为单体用于制造合成橡胶(丁苯橡胶、顺丁橡胶、丁腈橡胶、氯丁橡胶),其中丁二烯中微量水含量控制作为决定丁二烯合格与否的重要指标,丁二烯产品中水分会对聚合工艺产生影响,丁二烯聚合中水分产生静电离子致使聚合物被容器、管道壁吸附,发生堵塞现象,成为聚合工艺过程中一个重要的问题。以卡尔?费休库仑法为主,总结测定丁二烯水分的影响因素,便于提高分析准确度。 相似文献
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Shuang-quan Deng Qiang Liu Xiao Bao 《Polymer-Plastics Technology and Engineering》2015,54(11):1184-1192
An oxazoline-functionalized core–shell impact modifier was synthesized between aminoethanol and acrylonitrile/butadiene/styrene high rubber powder. According to the Fourier transform infrared spectroscopy test, the nitrile groups were partially converted into oxazoline groups successfully. The oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder was used as an impact modifier for acrylonitrile–butadiene–styrene/poly(ethylene terephthalate) blends. The differential scanning calorimeter and rheological tests demonstrated that poly(ethylene terephthalate) was partially miscible with acrylonitrile–butadiene–styrene, because the oxazoline groups of oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder reacted with the end groups of poly(ethylene terephthalate). The results of scanning electron microscopy indicated that the morphology of acrylonitrile–butadiene–styrene/poly(ethylene terephthalate) blends with proper oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder content was improved significantly. The best mechanical properties were achieved, When 6 wt% oxazoline-functionalized acrylonitrile/butadiene/styrene high rubber powder was added into acrylonitrile–butadiene–styrene/poly(ethylene terephthalate) blends. 相似文献
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(续上期 )2 2 ,6 -二甲基萘提纯技术 在 2 ,6-DMN的制备过程中 ,除了得到 2 ,6-DMN外 ,都不可避免地带有DMN的其他异构体 ,特别是 2 ,7-DMN ,但二甲基萘异构体的沸点非常接近[4 9] ,用蒸馏法难以相互分离。而为了制备高纯度的聚合级 2 ,6-萘二甲酸二甲酯 ,氧化用的 2 ,6-DMN纯度必须非常高。因此 ,必须对 2 ,6-DMN进行严格提纯与分离。提纯与分离方法主要有冷冻结晶法、高压结晶法、吸附法、结晶和吸附法等。2 .1 冷冻结晶法 BPAmoco公司采用冷冻结晶法回收和提纯2 ,6-DMN[31 ,50 ] 。该公司用套管结晶器从DMN混合物中… 相似文献
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本文利用内循环无梯度反应器,在320~420℃及较宽的各组分分压范围内研究了B-02工业催化剂用于丁烯氧化脱氢反应的本征动力学.按照串-并联反应网络,依据Redox机理、L-H机理和幂函数型规律构想出28个动力学模型;应用模型参数的物理特征、参数估值中的残差平方和相对大小以及非本征参数法筛选模型;采用模式探测法和马垮特法相结合的综合方法进行模型参数估值,从而求得适宜的本征动力学模型.最后对所定动力学模型进行显著性检验,证明该模型对实验数据确有较好的表现力.文中还讨论了水/烯比值对模型参数的影响、丁二烯的阻碍作用及催化剂的选择性等问题. 相似文献
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W. Fehrmann M. Hampel W. Pritzkow M. Rllig 《Advanced Synthesis \u0026amp; Catalysis》1975,317(6):965-978
Diels-Alder Reactions. IV. Studies on the Codimerization of Cyclopentadiene with Butadiene The reaction of cyclopentadiene with butadiene between 120°C and 170°C yields only about 35% exo/endo-2-vinylbicyclo[2,2,1]heptane-(5); 4,7,8,9-tetrahydroindene, dicyclopentadiene and the homodimers of butadiene are formed as inevitable by-products. The parallel and consecutive reactions which take place in the system cyclopentadiene/butadiene were separately studied as far as possible, and the activation parameters were determined. Surprisingly, in the homodimerization of butadiene the activation parameters for the symmetry-allowed formation of 4-vinylcyclohexene and the symmetry-forbidden formation of trans-1,2-divinylcyclobutane and of cyclooctadiene-(1,5) show very similar values. 相似文献
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对称型双端过渡态丁二烯/苯乙烯嵌段共聚物的研制Ⅰ.共聚合反应动力学研究 总被引:3,自引:0,他引:3
以双卤代烷烃取代型双锂齐聚物为引发剂、环己烷为溶剂,丁二烯(B)、苯乙烯(S)单体采用1次加入的方法,合成了对称型双端过渡态丁二烯/苯乙烯嵌段共聚物S-(S/B)-B-(B/S)-S,并对双锂体系丁二烯、苯乙烯共聚合反应过程进行了研究,将丁二烯、苯乙烯共聚合反应动力学数据进行分段处理,求得不同引发温度、不同单体配比、不同极性添加剂用量[二乙二醇二甲醚(2G)/Li]下丁二烯聚合段、苯乙烯聚合段假一级表观增长反应速度常数kp1、kp2;求得不同2G/Li下丁二烯、苯乙烯共聚合反应的表观竞聚率,随着2G/Li的增大,丁二烯的表观竞聚率减小,苯乙烯的表观竞聚率增大,表明随着2G/Li的增大,丁二烯、苯乙烯逐渐向无规共聚合方向发展. 相似文献
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Two series of butadiene–isoprene copolymers with a 1,2 and/or 3,4 structure were prepared at different polymerization temperatures, using CrCl2(dmpe)2‐MAO as a catalyst system. Copolymerization carried out at higher temperature resulted in polymers in the whole range of monomeric ratio, from the highly crystalline 1,2‐syndiotactic polybutadiene to the amorphous 3,4‐polyisoprene. The molar composition of the butadiene–isoprene copolymers and the syndiotactic index of the butadiene sequences, represented as molar fraction of the syndiotactic pentads, were evaluated by carbon‐13 nuclear magnetic resonance spectroscopy. The thermal behavior of the copolymers was investigated by differential scanning calorimetry. Nonisothermal crystallization kinetics were characterized by Ziabicki and Avrami methods as modified by Jeziorny. The crystallization and melting temperatures and the enthalpy of fusion of the copolymers were in good correlation with the syndiotactic index of butadiene sequences. The index was influenced by polymerization temperature and composition of butadiene–isoprene copolymers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 12: 2737–2743, 2003 相似文献
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催化裂化装置产生的C4馏分中含有微量丁二烯,在后续加工过程中为有害杂质,需要除去,采用选择性加氢脱除二烯烃是一种有效的方法。研究了一种非负载型非贵金属镍基催化剂的制备方法,采用XRD、TEM、FT-IR和TG-DTG-DTA等考察催化剂制备条件对晶相结构及形貌特征的影响,并在高压固定床反应装置上考察催化剂对C4馏分中丁二烯选择性加氢脱除的催化反应性能。结果表明,采用碱镍物质的量比为1.05和温度120 ℃条件下合成的镍催化剂前驱体,在90 ℃制备的催化剂性能最优。在氢压1.0 MPa、反应温度60 ℃、氢油体积比20和液时空速2.0 h-1条件下,制备的镍基选择性加氢催化剂能将C4馏分中低含量丁二烯烃完全脱除,具有良好的二烯烃选择性加氢活性。 相似文献