Hydrotreating polyester precursors
    14.
    发明授权
    Hydrotreating polyester precursors 有权
    加氢处理聚酯前体

    公开(公告)号:US07067615B1

    公开(公告)日:2006-06-27

    申请号:US11151085

    申请日:2005-06-13

    IPC分类号: C08F6/00

    CPC分类号: C08G63/78

    摘要: A process comprising contacting a liquid polyester stream with hydrogen in the presence of a hydrogenation catalyst comprising a metal supported on the surface of silicon carbide at a metal dispersion of at least 0.5% or graphite at a metal dispersion of at least 10% to produce a treated liquid polyester stream. The treated stream may be polycondensed in the presence of a polycondensation catalyst to produce a polyester polymer having an It.V. of at least 0.55 dL/g. The liquid polyester stream desirably has a composition comprising: a) terephthalic acid residues, isophthalic acid residues, and/or naphthalenedicarboxylic acid residues and b) an average degree of polymerization of 0.5 to 20 and c) an acid number ranging from 5 to 600.

    摘要翻译: 一种方法包括在氢化催化剂存在下使液体聚酯流与氢气接触,所述氢化催化剂包含以至少0.5%的金属分散体或至少为10%的金属分散体的石墨支撑在碳化硅表面上的金属,以产生至少10%的金属分散体 处理液体聚酯流。 处理过的物流可以在缩聚催化剂的存在下进行缩聚以制备具有It.V.的聚酯聚合物。 至少0.55dL / g。 液体聚酯流理想地具有包括:a)对苯二甲酸残基,间苯二甲酸残基和/或萘二甲酸残基的组合物,以及b)平均聚合度为0.5至20,c)酸值为5至600。

    Catalyst and process for the preparation of unsymmetrical ketones
    16.
    发明申请
    Catalyst and process for the preparation of unsymmetrical ketones 审中-公开
    用于制备不对称酮的催化剂和方法

    公开(公告)号:US20070100166A1

    公开(公告)日:2007-05-03

    申请号:US11525150

    申请日:2006-09-22

    IPC分类号: C07C45/48

    摘要: Carboxylic acid mixtures form unsymmetrical ketones in yields approaching statistical using zirconia catalysts promoted with Group IA and IIA elements. Active catalysts exist in their monoclinic or tetragonal but not cubic form. And the level of promoter loading is generally less than ten percent. The advantages of this catalyst over other ketonization catalysts include its high selectivity to ketones, its low formation of dehydrogenated byproducts, and its stability. The catalyst stability permits its regeneration to remove carbon accumulations by air oxidation. This regeneration restores full catalytic activity.

    摘要翻译: 羧酸混合物形成不对称酮,产率接近使用IAA和IIA族元素促进的氧化锆催化剂统计。 活性催化剂存在于它们的单斜晶体或四方晶体,而不是立方体形式。 而启动子载体的含量通常小于百分之十。 该催化剂优于其它酮化催化剂的优点包括其对酮的高选择性,低脱氢副产物的形成及其稳定性。 催化剂稳定性允许其再生以通过空气氧化去除碳积聚。 这种再生可恢复充分的催化活性。

    PROCESS FOR THE PREPARATION OF 2,2,4,4-TETRAALKYLCYCLOBUTANE-1,3-DIOLS
    17.
    发明申请
    PROCESS FOR THE PREPARATION OF 2,2,4,4-TETRAALKYLCYCLOBUTANE-1,3-DIOLS 有权
    制备2,2,4,4-四烯丙基-1,3-丁二醇的方法

    公开(公告)号:US20120149947A1

    公开(公告)日:2012-06-14

    申请号:US12963698

    申请日:2010-12-09

    IPC分类号: C07C29/145 B82Y30/00

    摘要: Disclosed is a process for the preparation of a 2,2,4,4-tetraalkylcyclobutane-1,3-diol by hydrogenation of the corresponding 2,2,4,4-tetraalkylcyclobutane-1,3-dione in the vapor phase in the presence of a supported catalyst. The process is useful for the preparation of 2,2,4,4-tetramethylcyclobutane-1,3-diol from 2,2,4,4-tetramethylcyclobutane-1,3-dione. The process can produce a 2,2,4,4-tetraalkylcyclobutane-1,3-diol product having a cis:trans isomer ratio of 1:1 or greater.

    摘要翻译: 公开了一种通过在气相中氢化相应的2,2,4,4-四烷基环丁烷-1,3-二酮来制备2,2,4,4-四烷基环丁烷-1,3-二醇的方法 载体催化剂的存在。 该方法可用于从2,2,4,4-四甲基环丁烷-1,3-二酮制备2,2,4,4-四甲基环丁烷-1,3-二醇。 该方法可以制备具有1:1:1或更大的顺式:反式异构体比例的2,2,4,4-四烷基环丁烷-1,3-二醇产物。