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动植物油脂低温低压氢化技术及助剂的研究 总被引:1,自引:0,他引:1
使用了一种镍催化剂低温、低压加氢技术 ,同时使用了具有较好吸附性的助剂 ,来提高加氢效率。氢化工艺能达到低温、低压、短氢化时间。使氢化过程更加完善。确定了反应的优惠条件 :氢化反应时间为 10 0~ 110min ,反应温度为 10 0℃ ,催化剂用量为 0 5 5kg(相对于 10kg猪油 ) ,反应压力为 0 .5 5MPa。在这一反应条件下猪油氢化可得到熔点为 5 6~5 8℃ ,碘值≤ 2的硬脂酸用氢化油。加入助剂能平均缩短反应时间约 15min。可以平均降低压力 0 0 5MPa。 相似文献
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氢化丁腈橡胶的特殊品种及应用 总被引:2,自引:0,他引:2
为进一步提高氢化丁腈橡胶的性能,原材料开发商研制生产了包括低温氢化丁腈橡胶、耐热氢化丁腈橡胶、易加工氢化丁腈橡胶、丙烯酸盐增强氢化丁腈橡胶、氢化羧基丁腈橡胶和氢化丁腈橡胶/塑料共混胶等一系列特殊品种。 相似文献
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介绍了黄河水电公司新能源分公司引进的低温氢化装置运行情况,对如何提高低温氢化转化率进行了初步研究和总结。 相似文献
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介绍了目前国内外电子级多晶硅生产技术的发展状况,重点说明了改良西门子法电子级多晶生产技术原理及其工艺流程,主要包括:氢气制备及纯化、氯化氢合成、低压氯化(三氯氢硅合成)、低温氢化(四氯化硅转化)、精馏、CVD还原、尾气回收和后处理等工序。结合电子级多晶硅生产技术的成功工程应用实践,介绍了电子级多晶硅项目的技术特点。 相似文献
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改良西门子法是生产多晶硅的主流工艺, 四氯化硅的氢化技术是其改良的关键。传统的热氢化和冷氢化方法存在着能耗高和转化率低的缺点。本文介绍了四氯化硅制备三氯氢硅的等离子体氢化技术, 概述了热等离子氢化方法, 主要包括直流放电等离子体法、高压射频等离子体法、低压射频等离子体法、微波等离子体法等, 简述了冷等离子氢化方法, 并对介质阻挡放电等离子体法进行了介绍和实验探索。对各种等离子体氢化方法进行了综合性的分类和分析讨论, 指出了现存各方法的优缺点, 提出了等离子氢化技术在工业化时的关键难题, 并对各种方法的应用前景进行了展望。 相似文献
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为确立丙烷脱氢制丙烯工艺中低温分离单元的最佳制冷流程,采用PRO/Ⅱ8.2化工流程模拟软件,对低温分离单元进行模拟计算,考察了温度和压力对低温分离效果的影响,分析并确立了最佳分离温度和压力范围;在分离效果相同的前提下,分别比较了丙烯+乙烯级联制冷、丙烯预冷+混合制冷和丙烯预冷+富氢气膨胀制冷3种制冷流程的公用工程消耗以及各自的优缺点。结果表明:产品压缩机出口压力对分离效果影响较小,在确保下游装置能够正常操作的情况下,分离压力应尽可能低;分离温度是影响分离效果的主要因素,较为经济的分离温度为-90—-100℃;相对于其他2种流程,丙烯+乙烯级联制冷流程具有技术成熟、能耗低和操作简单等优点,更适合于丙烷脱氢制丙烯工艺。 相似文献
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低温多效蒸发海水淡化系统热力分析 总被引:1,自引:0,他引:1
建立了喷射器低温多效蒸发海水淡化系统的数学模型,计算分析了各种温度损失随温度的变化,并研究了顶值盐水温度、蒸发器效数和动力蒸汽等参数对系统的造水比和生产单位质量淡水所需传热面积的影响。结果表明各种温度损失在末效蒸发器内显著增加;喷射器低温多效蒸发系统的热力特性明显优于多效蒸发系统;通过增加顶值盐水温度、蒸发器效数和动力蒸汽温度,可以实现系统的优化运行。 相似文献
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低温化学镀镍研究进展 总被引:14,自引:5,他引:9
由于高温化学镀镍在应用方面的局限性 ,因而低温化学镀镍的研究越来越受到人们的重视。本文阐述了低温化学镀镍的特点 ,总结了国内外在化学镀镍低温化方面的研究成果。 相似文献
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Sangeeta Jha Shantanu Bhowmik Nitu Bhatnagar Nayan Kamal Bhattacharya Utpal Deka Hafiz Mohammad Salim Iqbal Rinze Benedictus 《应用聚合物科学杂志》2010,118(1):173-179
High performance polymer, Polyether Ether Ketone (PEEK) (service temperature ?250°C to +300°C, tensile strength: 120 MPa) is gaining significant interest in aerospace and automotive industries. In this investigation, attention is given to understand adhesion properties of PEEK, when surface of the PEEK is modified by two different plasma processes (i) atmospheric pressure plasma and (ii) low pressure plasma under DC Glow Discharge. The PEEK sheets are fabricated by ultra high temperature resistant epoxy adhesive (DURALCO 4703, service temperature ?260°C to +350°C). The surface of the PEEK is modified through atmospheric pressure plasma with 30 and 60 s of exposure and low pressure plasma with 30, 60, 120, 240, and 480 s of exposure. It is observed that polar component of surface energy leading to total surface energy of the polymer increases significantly when exposed to atmospheric pressure plasma. In the case of low pressure plasma, polar component of surface energy leading to total surface energy of the polymer increases with time of exposure up to 120 s and thereafter, it deteriorates with increasing time of exposure. The fractured surface of the adhesively bonded PEEK is examined under SEM. It is observed that unmodified PEEK fails essentially from the adhesive to PEEK interface resulting in low adhesive bond strength. In the case of surface modified PEEK under atmospheric pressure plasma, the failure is entirely from the PEEK and essentially tensile failure at the end of the overlap resulting in significant increase in adhesive bond strength. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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It is generally accepted that the origin of the structural features of low density polyethylene (branching, unsaturation, molar mass and its distribution) can be explained by various isomerisation and decomposition reactions of the macroradicals and by various chain transfer processes. On the other hand, it is known that ethylene molecules under high pressure are organised in various supermolecular particles. There are several phases in compressed ethylene (α, β and γ) depending on the pressure and temperature. The purpose of the present work was to determine the effects of the phase state of ethylene on the structure and properties of polyethylene. The authors have compiled published data about the effects of the synthesis pressure and temperature on the structure and properties of polyethylene. The entropy of ethylene under sythesis conditions for those published experiments was determined from the available information on pressure and temperature. The effects of ethylene entropy on the number and type of short chain branches, long chain branches, unsaturated bonds, molar mass and its distribution, chain flexibility, density and the melting point of polyethylene are demonstrated. It was found that under given ethylene entropy conditions, the same structure and properties of polyethylene are obtained. 相似文献