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449 条记录 (耗时 0.024 秒)

    Process for producing froth polyurethane foam
    22.
    发明授权
    Process for producing froth polyurethane foam 失效
    生产泡沫聚氨酯泡沫的方法

    公开(公告)号：US5859081A

    公开(公告)日：1999-01-12

    申请号：US731782

    申请日：1996-10-18

    申请人： Robert D. Duffy

    发明人： Robert D. Duffy

    IPC分类号： B29C44/06 ,  C08J9/30 ,  C08J9/36 ,  C08G18/00

    CPC分类号： C08J9/365 ,  B29C44/06 ,  C08J9/30 ,  C08J2375/04 ,  Y10S521/917 ,  Y10T428/249953 ,  Y10T428/31554

    摘要： High quality, consistent polyurethane froth foams, both filled and unfilled, are prepared by directing polyol, isocyanate, and optionally other polyurethane-forming ingredients to a high pressure mix head prior to introducing the mixture to a froth foaming head. Changes in stoichiometry may be made rapidly without shut-down. An in-line blender incorporated filler into the polyol stream minimizing density differentials normally encountered in the holding tank, maintaining low and reproducible viscosity, and allowing for greater amounts of filler than otherwise possible.

    摘要翻译： 在将混合物引入泡沫泡沫头之前，将多元醇，异氰酸酯和任选的其它形成聚氨酯的成分引入高压混合头来制备高质量，一致的聚氨酯泡沫泡沫，填充和未填充。 化学计量的变化可以在没有关闭的情况下快速进行。 在线混合器将填料加入到多元醇料流中，使通常在储存罐中遇到的密度差最小化，保持低的和可再现的粘度，并且允许比其它可能的更大量的填料。

    Method of reducing pinch deformation and contour lines in polyurethane molded foam employing timed partial pressure release
    26.
    发明授权
    Method of reducing pinch deformation and contour lines in polyurethane molded foam employing timed partial pressure release 失效
    使用定时分压释放的聚氨酯模制泡沫中减小夹点变形和轮廓线的方法

    公开(公告)号：US5772936A

    公开(公告)日：1998-06-30

    申请号：US385409

    申请日：1995-02-08

    申请人： Keith Douglas Cavender

    发明人： Keith Douglas Cavender

    IPC分类号： B29C39/02 ,  B29C44/34 ,  B29K75/00 ,  B29K105/04 ,  B29C44/02

    CPC分类号： B29C44/588 ,  B29C44/3438 ,  B29K2105/045

    摘要： An improved process for cell opening of cellular polyurethane molded foam using timed partial pressure release (TPPR) reduces pinch deformation and contour lines by releasing the internal mold pressure in a curing cellular molded polyurethane foam product in a controlled manner which allows gas to escape from the mold, but which prohibits relative movement of the mold sealing surfaces by more than an imperceptible amount.

    摘要翻译： 使用定时分压释放（TPPR）的泡孔聚氨酯模塑泡沫泡孔的改进方法通过以受控的方式释放固化的聚氨酯泡沫塑料产品中的内部模具压力来减少夹紧变形和轮廓线，这允许气体从 模具，但是其阻止模具密封表面的相对运动超过不可察觉的量。

    Process for preparing polyoxyalkylene polyether polyols having low levels of transition metals through double metal cyanide complex polyoxyalkylation
    27.
    发明授权
    Process for preparing polyoxyalkylene polyether polyols having low levels of transition metals through double metal cyanide complex polyoxyalkylation 失效
    通过双金属氰化物配合物聚氧化烷基化制备具有低水平过渡金属的聚氧化烯聚醚多元醇的方法

    公开(公告)号：US5767323A

    公开(公告)日：1998-06-16

    申请号：US577986

    申请日：1995-12-22

    申请人： Yiannakis Televantos ,  Bi Le-Khac

    发明人： Yiannakis Televantos ,  Bi Le-Khac

    IPC分类号： C08G65/10 ,  C08G65/26 ,  C07C43/11

    CPC分类号： C08G65/2663 ,  Y02P20/584

    摘要： Substantially transition metal-free polyoxyalkylene polyethers may be prepared by double metal cyanide complex-catalyzed oxyalkylation of a suitable hydric oxyalkylation initiator molecule by employing 15 ppm or less of a double metal cyanide complex oxyalkylation catalyst having a propylene oxide polymerization rate greater than 5 g propylene oxide/minute. The induction periods associated with oxyalkylation employing double metal cyanide complex catalysts may be reduced by preparing preactivated master batches and by increasing the oxyalkylation reactor temperature during at least the induction period.

    摘要翻译： 通过使用15ppm或更少的环氧丙烷聚合速率大于5g丙烯的双金属氰化物络合物烷氧基化催化剂，可以通过合适的羟基烷氧基化引发剂分子的双金属氰化物络合物催化的烷氧基化制备基本上无过渡金属的聚氧化烯聚醚 氧化物/分钟。 与使用双金属氰化物配合物催化剂的烷氧基化相关的诱导期可以通过制备预活化的母料和在至少诱导期间增加烷氧基化反应器温度来降低。

    Removal of dinitrotoluene from process water
    28.
    发明授权
    Removal of dinitrotoluene from process water 失效
    从工艺用水中除去二硝基甲苯

    公开(公告)号：US5763696A

    公开(公告)日：1998-06-09

    申请号：US827326

    申请日：1997-03-26

    申请人： Allen B. Quakenbush ,  Majid N. Keyvani ,  Michael C. Fullington ,  James L. Meyer

    发明人： Allen B. Quakenbush ,  Majid N. Keyvani ,  Michael C. Fullington ,  James L. Meyer

    IPC分类号： B01D3/34 ,  C07C201/12 ,  C07C205/00

    CPC分类号： B01D3/34

    摘要： Reduction of dinitrotoluene impurity in water is achieved by distillation in the presence of nitric acid. A suitable process for such reduction comprises (a) contacting said composition with nitric acid to provide a nitric acid-containing composition, (b) distilling at least a portion of said water in said nitric acid-containing composition to provide vaporized water containing a reduced concentration of said dinitrotoluene, and (c) separating said vaporized water from said nitric acid-containing composition.

    摘要翻译： 在硝酸存在下通过蒸馏来还原二硝基甲苯杂质。 用于这种还原的合适方法包括（a）使所述组合物与硝酸接触以提供含硝酸的组合物，（b）在所述含硝酸的组合物中蒸馏至少一部分所述水以提供含有还原剂的蒸发水 所述二硝基甲苯的浓度，和（c）从所述含硝酸的组合物中分离所述蒸发的水。

    Purification of acetone
    29.
    发明授权
    Purification of acetone 失效
    纯化丙酮

    公开(公告)号：US5762764A

    公开(公告)日：1998-06-09

    申请号：US705378

    申请日：1996-08-29

    申请人： Te Chang ,  Vijai P. Gupta

    发明人： Te Chang ,  Vijai P. Gupta

    IPC分类号： C07C45/83 ,  B01D3/40 ,  C07C49/08

    CPC分类号： C07C45/83

    摘要： Close boiling hydrocarbon impurities are separated from acetone by extractive distillation using a C.sub.9 -C.sub.14 alkane and/or a C.sub.8 -C.sub.12 aromatic hydrocarbon extractive distillation solvent.

    摘要翻译： 使用C 9 -C 14烷烃和/或C 8 -C 12芳烃萃取蒸馏溶剂通过萃取蒸馏将沸腾的烃杂质与丙酮分离。

    Regeneration of a titanium-containing molecular sieve
    30.
    发明授权
    Regeneration of a titanium-containing molecular sieve 失效
    含钛分子筛的再生

    公开(公告)号：US5741749A

    公开(公告)日：1998-04-21

    申请号：US600661

    申请日：1996-02-13

    申请人： Guy L. Crocco ,  John G. Zajacek

    发明人： Guy L. Crocco ,  John G. Zajacek

    IPC分类号： B01J29/89 ,  B01J29/90 ,  C07D301/12 ,  B01J20/34 ,  B01J38/02 ,  B01J38/06 ,  B01J38/10

    CPC分类号： C07D301/12 ,  B01J29/89 ,  B01J29/90 ,  Y02P20/584

    摘要： A titanium-containing molecular sieve which has been used as an oxidation catalyst is regenerated to provide a level of performance comparable to that of freshly prepared catalyst by heating in the presence of a gas stream comprised of less than 5 volume percent molecular oxygen. The regeneration temperature may be in the range of from 150.degree. C. to 700.degree. C. The same batch of catalyst thus may be used over an extended period of time in a continuous epoxidation process by periodic practice of the aforedescribed reactivation method.

    摘要翻译： 已经用作氧化催化剂的含钛分子筛再生，以通过在由小于5体积％的分子氧组成的气流的存在下加热而提供与新制备的催化剂相当的性能水平。 再生温度可以在150℃至700℃的范围内。因此，通过上述重新激活方法的周期性实践，可以在连续环氧化方法中延长的时间段内使用相同批次的催化剂。