共查询到19条相似文献,搜索用时 62 毫秒
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介绍了近年来国内外几种不同的甲胺合成催化剂--改性丝光沸石催化剂的制备、特性及对二甲胺的选择性,该几种催化剂均具有较高的活性,交大地提高了二甲胺的选择性,表现出了良好择形效应。最后提出了几点有关甲胺生产技术发展的建议。 相似文献
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SC-B03型甲胺催化剂及其反应性能的研究 总被引:1,自引:0,他引:1
用铵盐、羟基羧酸和非碱金属盐改性处理丝光沸石制备的SC-B03型甲胺催化剂,其物化性能达到工业使用要求。该催化剂适宜的反应条件为:温度300~330℃,压力1.5~3.0MPa,N/C 2.0~2.5 甲醇空速0.50~0.75g/h·g-cat。原料中不含三甲胺时,二甲胺选择性为60%;原料中三甲胺含量为13.9wt%时,二甲胺选择性为72.7%~83.7%。反应温度和原料甲醇中甲醛含量是影响该催化剂活性下降的两个极为重要因素。在工业应用中,严格控制催化剂层的温度和原料甲醇中甲醛含量是保证该催化剂使用寿命的关键。 相似文献
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本文以吸附孔分布法研究了丝光沸石催化剂在甲苯歧化和C_9芳烃烷基转移反应中的结焦行为。通过实验,阐明了催化剂上“焦”的沉积部位以及孔结构与结焦和催化性能之间的关系。结果表明,反应1000小时后,催化剂上的“焦”主要沉积在沸石晶粒外表面与粘结剂组成的二次孔中;而其孔径和孔容对结焦和催化剂性能有不可忽视的影响。 相似文献
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Juan M. Garcés Michael M. Olken G. John Lee Garry R. Meima Pierre A. Jacobs Johan A. Martens 《Topics in Catalysis》2009,52(9):1175-1181
This is a review of work carried at Dow Chemical on the design and characterization of novel mordenite catalysts with a unique
micro and meso-porous structure characterized by a variety of methods including, TEM, BET surface area and pore size distribution,
and n-decane hydro-conversion. The catalytic performance of these catalysts in shape selective reactions is illustrated with results
from n-decane hydro-conversion and applications to alkylation and trans-alkylation reactions of mono and polynuclear aromatic hydrocarbons and other chemistries.
Juan M. Garcés and G. John Lee both retired from The Dow Chemical Company. 相似文献
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甲基丙烯酰胺丙基二甲基胺的合成及应用 总被引:5,自引:0,他引:5
本文主要介绍了DMAPMA的几种合成工艺路线,列举了以甲基丙烯酸甲酯和N,N-二甲基丙二胺为原料进行酯交换反应合成DMAPMA的工艺方法,并详细介绍了它在日化行业作为调理剂和定型剂的产品应用。 相似文献
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微细氧化铈制备新工艺的研究 总被引:2,自引:0,他引:2
提出了用碳铵法制备高分散性微细氧化铈的新工艺,研究了碳酸铈洗涤次数,干燥和焙烧温度等因素对氧化铈的分散性能的影响,在选定的条件下,CeO2产品的比表面积可达100-120m^2/g. 相似文献
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Two novel bis(amine anhydride) monomers, N,N′-bis(3,4-dicarboxyphenyl)-1,4-phenylenediamine dianhydride I and N,N′-bis(3,4-dicarboxyphenyl)-1,3-phenylenediamine dianhydride II, were prepared via palladium-catalyzed amination reaction of 4-chloro-N-methylphthalimide with 1,4-phenylenediamine or 1,3-phenylenediamine, followed by alkaline hydrolysis of the intermediate bis(amine imide)s and subsequent dehydration of the resulting tetraacids. A series of new poly(amine imide)s were prepared from the synthesized dianhydride monomers with various diamines in NMP via conventional two-step method. FT-IR spectra of the poly(amine imide)s revealed that in the solid state, intermolecular and intramolecular hydrogen bonding (N-H?OC) are present. These polymers had glass transition temperatures in the range of 250-295 °C. The 10% weight loss temperature of the resulting poly(amine imide)s ranged from 539 to 560 °C in nitrogen. The poly(amine imide)s have the peel strength values ranging from 283 to 358 N/m. The poly(amine imide)s films were found to be transparent, flexible, and tough. The films had a tensile strength, elongation at break, and tensile modulus in the ranges 102-152 MPa, 11.3-19.6%, and 1.04-2.08 GPa, respectively. 相似文献
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采用硫酸高铈与阳离子交换树脂反应制备的改性离子交换树脂催化合成了异戊酸丁酯。考察了催化剂用量、醇酸物质的量比、反应时间及带水剂等因素对收率的影响。适宜反应条件:异戊酸用量为0.2 mol,醇酸物质的量比为1.6,催化剂用量为2.0 g,反应时间为60 min,苯用量为5 mL,收率可达91.3%。 相似文献