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以732#强酸性阳离子树脂为催化剂制备环氧菜籽油,在不同条件下进行环氧化反应,得到较工艺条件,并对影响环氧化反应的几种因素作了探讨。 相似文献
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高品质环氧大豆油的实验研究 总被引:2,自引:0,他引:2
环氧大豆油是强前增塑效果比较好的无毒、环保、可再生资源捌备的增塑翔,主要是用大豆油采用过氧化物氧化而制得的一种化工产品。近年来,我国已成为甄洲地区增塑剂生产量和消费最多的国家,随着人们环境保护意识的增强,医药以及食品包装、日用品、玩具等塑料制品对增塑剂提出了更高的卫生要求。文章通过实验研究了制备环氧大豆油的最佳原料配比,工艺条件和影响产晶质量的因素,并通过正交试验确定了最佳制备工艺条件。 相似文献
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高分子量高活性聚醚多元醇的合成研究 总被引:5,自引:0,他引:5
研究了以甘油为起始剂,在氢氧化钾催化下,用环氧乙烷封端的高分子量高活性聚醚多元醇的合成工艺。考察了影响反应时间和产品质量的多种因素,获得了较佳的制备工艺条件。提出了计算产品分于量的经验关联式。 相似文献
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无溶剂法合成环氧大豆油新工艺的研究 总被引:16,自引:0,他引:16
叙述了无溶剂法合成环氧大豆油的方法,主要反应条件对环氧化反应的影响,并对溶剂法合成环氧大豆油与无溶剂法合成环氧大豆油的技术路线,工艺流程、工艺条件以及产品质量进行了比较 相似文献
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阳离子沥青乳化剂—木质素季铵盐的研制 总被引:10,自引:0,他引:10
以纸浆废液中所含木质素为原料,以预制的环氧丙基三甲基氮化铵为中间体,在适当的催化条件下促进木质素与中间体形成阳离子季铵盐乳化剂,文中对中间体的合成工艺及性能作了详细地考察,并以龙口某厂草本纸浆废液中的木质素为原料制备出合格的沥青乳化剂。 相似文献
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广利油田储集层毛管压力特征 总被引:1,自引:0,他引:1
本论文运用毛管压力曲线的形态分析方法结合物性参数,对广利油田的储层进行了很好的评价,得出了大量的统计数据,广利油田存在三类储层,分析了各种储层的特征,对该地区的进一步勘探和油气田的开发提供了一定的依据,具有一定的参考价值。 相似文献
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K. W. Allen 《The Journal of Adhesion》2013,89(3-4):261-277
The once distinct and independent theories of adhesion have been losing their isolation and converging. Ideas of the effects of surface roughness, once dismissed as irrelevant except in the case of textiles, have been revised; albeit on a smaller scale as details of surfaces have been revealed by sophisticated techniques. Electrostatic interactions across an interface have been more deeply explored and their significance recognised and expounded. Diffusion of groupings and chain segments within a polymer have been related to the possibilities of interaction with a variety of surfaces. Perhaps most important, theories of adsorption have been extended in depth. The precise nature of the molecular interactions have been recognised and quantified. In doing this the contribution of diffusion and elastoplastic phenomena have been integrated. These developments are collated and analysed to present the present understanding of the concepts. 相似文献
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A Review of Contemporary Views of Theories of Adhesion 总被引:2,自引:0,他引:2
K. W. Allen 《The Journal of Adhesion》1987,21(3):261-277
The once distinct and independent theories of adhesion have been losing their isolation and converging. Ideas of the effects of surface roughness, once dismissed as irrelevant except in the case of textiles, have been revised; albeit on a smaller scale as details of surfaces have been revealed by sophisticated techniques. Electrostatic interactions across an interface have been more deeply explored and their significance recognised and expounded. Diffusion of groupings and chain segments within a polymer have been related to the possibilities of interaction with a variety of surfaces. Perhaps most important, theories of adsorption have been extended in depth. The precise nature of the molecular interactions have been recognised and quantified. In doing this the contribution of diffusion and elastoplastic phenomena have been integrated. These developments are collated and analysed to present the present understanding of the concepts. 相似文献
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Dr. Wanyama Peter Juma Dr. Dubekile Nyoni Prof. Dean Brady Prof. Moira L. Bode 《Chembiochem : a European journal of chemical biology》2022,23(7):e202100527
The Morita-Baylis-Hillman (MBH) reaction affords highly functionalised allylic alcohols containing a new stereogenic centre. These MBH adducts are very versatile and have been transformed into a large range of products, some of which have medicinal potential. Several examples of asymmetric syntheses of MBH adducts have been reported, although a generally applicable method remains to be developed. Biocatalytic approaches for the synthesis and enzymatic kinetic resolution of MBH adducts have been reported, and are discussed in detail in this review. Enzymes able to catalyse the asymmetric MBH reaction have been identified, but selectivity and efficiency have generally been low. Lipases, esterases and nitrile-converting enzymes have all been successfully applied in the resolution of MBH adducts, with excellent selectivity being realised in most cases. 相似文献
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Polycyclic Aromatic Hydrocarbons (PAHs) are a group of Volatile Organic Compounds (VOCs), which have serious health problems
associated with their emission into the atmosphere. Catalytic oxidation is an effective abatement process to control PAH emissions,
and the types of catalysts investigated have been reviewed. The majority of studies have used naphthalene as a model PAH,
and in particular, catalysts containing palladium and platinum have demonstrated high activity for total oxidation. Catalysts
based on the precious metals include those supported on high surface area supports, which have also been modified by adding
further components, and metal exchanged zeolites. Metal oxide catalysts have also been employed and the most active for total
oxidation are ceria-based. Studies of PAH total oxidation have largely been reported only in the last 10 years, and there
still remains wide scope to develop improved catalysts and understand their catalytic mechanisms. 相似文献
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驱油剂在双河油砂上的静态吸附研究 总被引:6,自引:0,他引:6
采用静态吸附法研究了驱油剂OCS(石油磺酸盐)和HPAM(部分水解聚丙烯酰胺)在河南油田双河油砂上的吸附特性,求出了在使用浓度下的表观静态吸附量和饱和吸附量,并用Langm u ir和F reund lich公式对其吸附趋势进行了预测,发现OCS和HPAM都具有典型的单分子层的吸附规律。 相似文献