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生物质乙醇制乙烯技术研究进展 总被引:1,自引:0,他引:1
阐述了生物质乙醇催化脱水制乙烯生产工艺的技术发展现状,着重介绍了催化剂的研制应用现状和不同生产工艺.并指出了生物质乙醇作为一种新能源的重要性及发展乙醇法制乙烯的重要意义及应用前景. 相似文献
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简述了乙烯 -醋酸加成制取醋酸乙酯新工艺原理和流程 ;并同醋酸 -乙醇酯化和乙醛缩合制醋酸乙酯生产工艺作比较 ,阐明了新工艺是醋酸乙酯生产中技术先进、经济效益高的生产方法。 相似文献
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《精细与专用化学品》2017,(8)
简述了二氯乙烷和氯乙烯生产技术和市场现状。氯乙烯是生产聚氯乙烯的重要单体,氯乙烯生产技术主要包括乙烯法和电石法;而二氯乙烷为乙烯法制氯乙烯的中间体,其生产工艺主要包括乙烯直接氯化法和乙烯氧氯化法。 相似文献
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根据国内外用玉米制乙醇,乙醇脱水制乙烯的技术经济情况及其发展趋势,进一步阐述了乙醇脱水制乙烯的工业化生产技术,与石油路线生产乙烯的对比,以及在我国发展的可能性。 相似文献
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国内外乙烯生产工艺的研究现状与展望 总被引:1,自引:0,他引:1
通过介绍乙烷脱氢,催化裂解,甲烷氧化偶联和甲醇转化及生物质乙醇脱水制乙烯等方法,阐述了乙烯制备的工业进展,并与传统催化裂解方法相比较,说明了其优缺点;分析了生物质乙醇脱水制乙烯原理与方法,生物质乙醇的来源,与其脱水制乙烯的优点以及国内外研究现状和发展前景。 相似文献
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燃料乙醇制备方法研究进展 总被引:1,自引:0,他引:1
综述了燃料乙醇制备方法的研究进展。介绍了溶盐精馏法、萃取精馏法、加盐萃取精馏法、吸附法及渗透汽化法等多种乙醇脱水提纯的方法,并对上述方法作用机理及特点进行对比。其中,吸附法能在常温常压下吸附脱除乙醇中的水,如能通过研究,进一步降低再生成本,是一项具有广阔前景的燃料乙醇制备技术。 相似文献
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未来中国聚氯乙烯生产原料来源分析 总被引:2,自引:0,他引:2
介绍了用石油生产乙烯、电石生产乙炔、天然气制备乙炔、合成气制备乙烯等方法,列举了由粮食、纤维和半纤维材料、农产品加工排放渣、工业废料等制取乙醇,由乙醇脱水生产乙烯的简要工艺。指出国内聚氯乙烯产能正处在快速增长时期,但用于生产聚氯乙烯原料的天然资源已临近枯竭,应因地制宜,充分发挥区域优势,原料来源多元化是中国未来聚氯乙烯生产原料来源的特点;完全依靠可再生资源将是实现聚氯乙烯可持续发展的根本保证。 相似文献
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The optimal flowsheet for the production of bioethanol from switchgrass via hydrolysis is proposed in this work. A superstructure embedding a number of alternatives is proposed. Two technologies are considered for switchgrass pretreatment, dilute acid and ammonia fiber explosion so that the structure of the grass is broken down. Next, enzymatic hydrolysis follows any of the pretreatments to obtain fermentable sugars, mainly xylose and glucose. Ethanol is obtained by fermentation of the sugars. To obtain fuel quality, ethanol and water must be removed from the water–ethanol mixture. A number of dehydration technologies is considered including rectification, adsorption in corn grits, molecular sieves, and pervaporation. The problem is formulated as a mixed‐integer nonlinear programming (MINLP). The superstructure is optimized by decomposing the MINLP for each of the pretreatments. Then, multieffect columns and heat integration are used to reduce the energy consumption and cooling needs. Finally, an economic evaluation is performed. The optimal flowsheet consists of using dilute acid hydrolysis followed by molecular sieves as dehydration technology, which requires less energy and cooling and yielding a promising production price of 0.8 $/gal. © 2011 American Institute of Chemical Engineers AIChE J, 2012 相似文献
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为开发新型生物质乙醇脱水制乙烯反应工艺,采用了上海石油化工研究院开发的氧化铝催化剂,在绝热床反应器中进行了工艺实验优化研究。考察了不同水醇质量比、空速和反应器进口温度等对乙醇转化率和乙烯选择性的影响,应用该实验数据,结合前期建立的该催化剂上的乙醇脱水催化反应本征动力学,对该催化剂上的乙醇脱水催化反应本征动力学方程系数进行校正,计算出关于关键组分的该催化剂的效率因子,建立了更适宜于工业应用的宏观动力学模型,模型计算结果与实验数据吻合较好。相对于等温固定床反应工艺或单段绝热床反应工艺,所研发的氧化铝催化剂上四段绝热床反应工艺的能耗降低,乙醇转化率提高,乙烯选择性得到很大的提高,为工业反应器的优化设计以及放大提供必须的工艺设计数据。 相似文献
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Ethylene production from petroleum or natural gas is an energy intensive process. Bio-ethanol catalytic dehydration to ethylene is an attractive alternative for oil based ethylene. Catalytic dehydration conversion of bio-ethanol to ethylene using HZSM-5 modified by 3 wt% rare earth metal (lanthanum) was carried out in a laboratory bioreactor. The physicochemical properties of the catalyst were characterized. The stability test showed that ethanol conversion and selectivity over this catalyst could be maintained above 98% for more than 950 h. The regenerated catalyst also displayed high reactivity and stability of up to 830 h can be obtained. The effects of temperature, liquid hourly space velocity, particle size of catalyst, and bio-ethanol partial pressure on products formation rate were investigated. The external and internal diffusion resistances were eliminated and the kinetic control range was identified. An apparent kinetics model was used to describe the dehydration reaction of ethanol over 3 wt% La-HZSM-5 catalyst, and the kinetic parameters were determined. 相似文献