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    • 4. 发明授权
    • Purification of p-xylene using composite mixed matrix membranes
    • 使用复合混合基质膜纯化对二甲苯
    • US06500233B1
    • 2002-12-31
    • US09697196
    • 2000-10-26
    • Stephen J. MillerCurtis L. MunsonSudhir S. KulkarniDavid J. Hasse
    • Stephen J. MillerCurtis L. MunsonSudhir S. KulkarniDavid J. Hasse
    • B01D5322
    • B01D61/362B01D53/228B01D61/246B01D69/08B01D69/12B01D69/141B01D69/147B01D69/148B01D71/028B01D71/10B01D71/56B01D2323/21C07C7/144C10G2400/30C07C15/08
    • Composite membranes capable of separating p-xylene from mixtures including p-xylene and m-xylene, and processes for purifying p-xylene using the membranes, are disclosed. The membranes are polymer membranes with a thickness of between about 10 and 1000 microns that include non-interconnected zeolite particles less than 5 microns. In one embodiment, a relatively thin polymer layer (0.5-3 microns) that includes zeolite particles is adjacent to a relatively thick polymer layer which may or may not include zeolite particles, where the thickness of the two layers is between about 10 and 1000 microns. The preferred ratio of zeolite/polymer is about 0.2 by weight. A preferred method for preparing the composite is by dispersing the zeolite in a polymer solution, casting a film of the polymer solution, and evaporating the solvent to form a polymeric film. The polymer permits passage of p-xylene and m-xylene in the vapor state, such that p-xylene diffuses at the same or a faster rate through the polymer. The polymer is preferably a polyaramide, polyimide or cellulose polymer p-Xylene and m-xylene diffuse through the zeolite, albeit at different rates. The zeolite is preferably an intermediate pore size zeolite, and more preferably, is silicalite or ZSM-5. The composite membrane is preferably in the form of a dense film or a hollow fiber. A mixture containing p-xylene and m-xylene can be enriched in p-xylene by a perstractive, pervaporative or gas-phase process through the membrane.
    • 公开了能够从包括对二甲苯和间二甲苯的混合物中分离对二甲苯的复合膜,以及使用该膜纯化对二甲苯的方法。 膜是厚度在约10至1000微米之间的聚合物膜,其包括小于5微米的非互连沸石颗粒。 在一个实施方案中,包括沸石颗粒的相对薄的聚合物层(0.5-3微米)邻近相对厚的聚合物层,其可以包括或可以不包括沸石颗粒,其中两层的厚度在约10和1000微米之间 。 沸石/聚合物的优选比例为约0.2重量%。 制备复合材料的优选方法是通过将沸石分散在聚合物溶液中,浇铸聚合物溶液的膜,并蒸发溶剂以形成聚合物膜。 聚合物允许在蒸气状态下通过对二甲苯和间二甲苯,使得对二甲苯以相同或更快的速率通过聚合物扩散。 聚合物优选聚芳酰胺,聚酰亚胺或纤维素聚合物对二甲苯和间二甲苯通过沸石扩散,尽管以不同的速率。 沸石优选为中等孔径沸石,更优选为硅沸石或ZSM-5。 复合膜优选为致密膜或中空纤维的形式。 含有对二甲苯和间二甲苯的混合物可以通过膜的渗透,蒸发或气相方法富集在对二甲苯中。
    • 5. 发明授权
    • Separation of olefins from paraffins using ionic liquid solutions
    • 使用离子液体溶液从石蜡中分离烯烃
    • US06339182B1
    • 2002-01-15
    • US09735176
    • 2000-12-12
    • Curtis L. MunsonLaura C. BoudreauMichael S. DriverWilliam L. Schinski
    • Curtis L. MunsonLaura C. BoudreauMichael S. DriverWilliam L. Schinski
    • C07C700
    • C10G70/002B01J2219/00047B01J2219/00306B01J2219/00599B01J2219/00702B01J2219/0072B01J2219/00759C07B63/00C07C1/0485C07C7/152C07C11/02C10G29/00C40B50/08C40B60/14G01N30/02Y02P30/42
    • Methods for separating olefins from non-olefins, such as parafins, including cycloparaffins, oxygenates and aromatics, are provided. The methods use metal salts to complex olefins, allowing the non-olefins to be separated by a variety of methods, including decantation and distillation. The metal salts are dissolved in ionic liquids, which tend to have virtually no vapor pressure, and which poorly solubilize the non-olefins. Accordingly, the non-olefins phase separate well, and can be distilled without carrying over any of the ionic liquid into the distillate. Preferred salts are Group IB salts, more preferably silver salts. A preferred silver salt is silver tetrafluoroborate. Preferred ionic liquids are those which form stable solutions or dispersions of the metal salts, and which do not dissolve the non-olefins. Further, if the olefins are subject to isomerization, the ionic liquid is preferably relatively non-acidic. The methods involve forming a solution of a suitable olefin-complexing salt in an appropriate ionic liquid. An olefin-containing mixture is contacted with the ionic liquid/salt solution, and the olefins are adsorbed. After the paraffins are removed, the olefins can be isolated by desorption. The olefin-containing mixture can be in the gas phase, or in the liquid phase. The flow of olefin-containing mixtures over/through the ionic liquid can be, for example, co-current, counter-current, or staged in stirred tanks. Countcrcurrent is preferred as it is the most efficient. The methods can be optimized using combinatorial chemistry.
    • 提供了从非烯烃分离烯烃的方法,如石蜡包括环烷烃,含氧化合物和芳族化合物。 该方法使用金属盐来络合烯烃,允许通过各种方法分离非烯烃,包括倾析和蒸馏。 金属盐溶解在离子液体中,其倾向于几乎不具有蒸气压,并且使非烯烃的溶解性差。 因此,非烯烃相分离井,并且可以蒸馏而不将任何离子液体输送到馏出物中。 优选的盐是IB族盐,更优选银盐。 优选的银盐是四氟硼酸银。 优选的离子液体是形成金属盐的稳定溶液或分散体并且不溶解非烯烃的离子液体。 此外,如果烯烃经历异构化,离子液体优选是相对非酸性的。 所述方法包括在合适的离子液体中形成合适的烯烃络合盐的溶液。 使含烯烃的混合物与离子液体/盐溶液接触,并且吸附烯烃。 在除去石蜡之后,可以通过解吸分离烯烃。 含烯烃的混合物可以处于气相或液相中。 通过离子液体的/通过离子液体的含烯烃混合物的流动可以是例如在搅拌釜中的并流,逆流或分段。 Countcrcurrent是首选,因为它是最有效的。 该方法可以使用组合化学方法进行优化。