Methods for Improving Heat Transfer in Polymerization Processes
    1.
    发明申请
    Methods for Improving Heat Transfer in Polymerization Processes 审中-公开
    改善聚合过程热传递的方法

    公开(公告)号:US20090131616A1

    公开(公告)日:2009-05-21

    申请号:US12260154

    申请日:2008-10-29

    IPC分类号: C08F4/08

    摘要: Methods for improving heat transfer in polymerization processes are described herein. The methods generally include contacting olefin monomer with a catalyst system within a reaction zone to form particles having a first average particle size and altering the reaction zone to improve heat transfer and form polymer particles having a second average particle size. For example, the second average particle size may be larger than the first average particle size and the second particle size results in improved heat transfer over the first particle size.

    摘要翻译: 本文描述了改善聚合方法中热传递的方法。 所述方法通常包括使烯烃单体与反应区内的催化剂体系接触以形成具有第一平均粒径并改变反应区以改善热传递并形成具有第二平均粒度的聚合物颗粒的颗粒。 例如,第二平均粒径可以大于第一平均粒径,第二粒径导致在第一粒径上的热传递改善。

    Cocatalysts for reduction of production problems in metallocene-catalyzed polymerizations
    4.
    发明授权
    Cocatalysts for reduction of production problems in metallocene-catalyzed polymerizations 有权
    用于减少茂金属催化聚合中的生产问题的助催化剂

    公开(公告)号:US07282546B2

    公开(公告)日:2007-10-16

    申请号:US11158454

    申请日:2005-06-22

    IPC分类号: C08F4/42

    摘要: Polyolefins may be prepared using a cocatalyst conforming to the formula: AIRz(Xz)nLzm wherein Rz is a linear or branched organic moiety having at least 5 carbons and Xz is a linear or branched organic moiety having at least 5 carbons or a heterocyclic moiety having at least 4 atoms and can be anionic or di-anionic. The aluminum complex may also be in the form of an adduct complex where Lz is a Lewis base and m=1-3. The cocatalyst Rz components are selected such that they do not react with water under polymerization conditions to form a species that is highly soluble in the polymerization diluent. Use of the specified cocatalyst reduces fouling during metallocene-catalyzed runs and “post-metallocene hangover” when the same production equipment is transitioned to non-metallocene catalyst runs using catalysts such as chromium.

    摘要翻译: 聚烯烃可以使用符合下列公式的助催化剂制备:<?in-line-formula description =“In-line formula”end =“lead”?>空气(X < ?????z???????????????????????????????????????? 其中R z是具有至少5个碳原子的直链或支链有机部分,X是具有至少5个碳原子的直链或支链有机部分或具有至少5个碳原子的杂环部分, 至少4个原子,可以是阴离子或二阴离子。 铝络合物也可以是加合物络合物的形式,其中L z是路易斯碱,m = 1-3。 选择助催化剂R z z组分使得它们在聚合条件下不与水反应以形成高度可溶于聚合稀释剂的物质。 使用特定的助催化剂可以减少金属茂催化运行期间的结垢和“后金属茂宿醉”,当相同的生产设备使用催化剂如铬转变为非茂金属催化剂运行时。

    Cocatalysts for reduction of production problems in metallocene-catalyzed polymerizations
    8.
    发明申请
    Cocatalysts for reduction of production problems in metallocene-catalyzed polymerizations 有权
    用于减少茂金属催化聚合中的生产问题的助催化剂

    公开(公告)号:US20060293472A1

    公开(公告)日:2006-12-28

    申请号:US11158454

    申请日:2005-06-22

    IPC分类号: C08F4/44

    摘要: Polyolefins may be prepared using a cocatalyst conforming to the formula: AIRz(Xz)nLzm wherein Rz is a linear or branched organic moiety having at least 5 carbons and Xz is a linear or branched organic moiety having at least 5 carbons or a heterocyclic moiety having at least 4 atoms and can be anionic or di-anionic. The aluminum complex may also be in the form of an adduct complex where Lz is a Lewis base and m=1-3. The cocatalyst Rz components are selected such that they do not react with water under polymerization conditions to form a species that is highly soluble in the polymerization diluent. Use of the specified cocatalyst reduces fouling during metallocene-catalyzed runs and “post-metallocene hangover” when the same production equipment is transitioned to non-metallocene catalyst runs using catalysts such as chromium.

    摘要翻译: 聚烯烃可以使用符合下列公式的助催化剂制备:<?in-line-formula description =“In-line formula”end =“lead”?>空气(X < ?????z???????????????????????????????????????? 其中R z是具有至少5个碳原子的直链或支链有机部分,X是具有至少5个碳原子的直链或支链有机部分或具有至少5个碳原子的杂环部分, 至少4个原子,可以是阴离子或二阴离子。 铝络合物也可以是加合物络合物的形式,其中L z是路易斯碱,m = 1-3。 选择助催化剂R z z组分使得它们在聚合条件下不与水反应以形成高度可溶于聚合稀释剂的物质。 使用特定的助催化剂可以减少金属茂催化运行期间的结垢和“后金属茂宿醉”,当相同的生产设备使用催化剂如铬转变为非茂金属催化剂运行时。