共查询到17条相似文献,搜索用时 78 毫秒
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分子蒸馏处理香料烟浸膏制备烟用香料 总被引:1,自引:0,他引:1
为了更好地精制富集烟草特征香味成分,采用分子蒸馏技术对溶剂法制备的香料烟浸膏进行分离,并对馏分进行GC/MS分析。GC/MS结果显示,在不同温度段,香料烟浸膏致香成分得到富集,特别是40~60℃馏分中香料烟重要香味成分茄酮达到了17%。评吸结果显示:原香料烟提取物能增香及提高香气质,但残留明显。经分子蒸馏处理后,40℃以下馏分香气质较好,香气量不足,余味舒适;40~60℃馏分香气质好,丰富烟香,口腔舒适,改善烟气状态;60~80℃馏分增加香气量,舌面口腔有残留;蒸余物则对烟气增香无明显影响。 相似文献
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Young Han Kim 《Chemical Engineering Research and Design》2011,89(12):2495-2500
A new internally heat-integrated distillation column for quaternary separation modified from a conventional three-column system is proposed, and its performance is examined here. Two sets of heat integration between the rectifying section and the stripping section of two adjacent columns are placed in the conventional three-column system. The proposed system has been applied two example processes, the hexane and BTX processes, for the performance evaluation of energy saving and reduction of entropy production. In the hexane process, the duty reductions in reboilers and condensers are 28.5% and 30.5%, respectively, and the entropy production is reduced by 12.2% compared with the conventional system. In the BTX process, the duty reductions are 27.8% and 31.6%, respectively, and the entropy production is decreased 9.8%. The compressor utilized in the existing internally heat-integrated distillation column is not used in the proposed system leaving no difficulty of its operation and maintenance. Also, the structural similarity of the new system to the conventional system gives the column operation as easy as the conventional system. 相似文献
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采用化工过程模拟软件Aspen Plus计算模型,模拟研究了液化天然气分离得iC4,nC4和C5+的过程,比较了现有常规蒸馏工艺和采用双效蒸馏以及热集成新工艺的能耗情况。结果表明,在相同的处理量和塔板数下,双效蒸馏和热集成新工艺的能耗都比常规蒸馏工艺有大幅度降低,而尤以热集成的节能效果最好。双效蒸馏工艺比常规蒸馏方案节能31.9%,热集成工艺节能达35.8%左右。对于此分离过程,采用双效蒸馏以及热集成新工艺都有应用前景,值得进一步推广应用。 相似文献
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Lechoslaw J. Krolikowski 《American Institute of Chemical Engineers》2017,63(11):4847-4861
A feasible separation region is determined for only four special combinations of a saturated vapor/liquid feed and total/partial condenser or reboiler. This work addresses the construction of a feasible separation region for a general case where the feed is a mixture of vapor and liquid in equilibrium and where the column is equipped with a partial/total condenser and reboiler. The analysis reveals that the product composition sets (which are defined for various reflux and reboil ratios and a fixed number of stages in each column section) are the main elements of the feasible separation region. The application of the geometric model of the column in combination with the shape of the distillation line led to the conclusion that the feasible separation region is the union of two product composition sets for both enriching and stripping columns both with an infinite number of stages. The boundary of the feasible separation region consists of several curves related to specific types of operating modes in the column. Some of these curves create a well‐known product composition multitude, whereas other curves form a generalized distillation limit. © 2017 American Institute of Chemical Engineers AIChE J, 2017 相似文献
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反应蒸馏分离技术进展 总被引:4,自引:0,他引:4
反应蒸馏分离是近年来发展起来的具有独特作用的新型分离技术。讨论了几个典型的反应蒸馏分离流程,指出了该技术的应用范围并分析了该分离过程的主要影响因素。 相似文献