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81.发明授权公开(公告)号：US07319166B2
公开(公告)日：2008-01-15
申请号：US10476187
申请日：2002-05-02
IPC分类号： C07C51/43 , C07D207/00
CPC分类号： C07D207/267 , C07C51/43 , C07C57/04
摘要： The invention relates to a method for purifying a raw melt of at least one monomer by crystallization, wherein suspension crystallization is initially used and the resulting remaining melt or the suspension crystals that have been molten once again and separated are subjected to a mechanical separation operation before undergoing subsequent purification by crystallization.
摘要翻译： 本发明涉及一种通过结晶纯化至少一种单体的原料熔体的方法，其中最初使用悬浮液结晶，并将所得剩余熔体或已经再次熔融并分离的悬浮液晶体进行机械分离操作，然后进行机械分离操作 随后通过结晶进行纯化。
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公开(公告)号：US07307132B2
公开(公告)日：2007-12-11
申请号：US10511603
申请日：2003-05-12
IPC分类号： C08F20/06 , C08F120/06 , C08F220/06
CPC分类号： C08F20/06
摘要： This invention relates to a process for preparing a low-odor hydrogel-forming acrylic acid polymer, which comprises the steps of: a) preparing a polymeric hydrogel by free-radically polymerizing a monomer composition comprising at least 50% by weight of acrylic acid in an aqueous polymerization medium and converting said hydrogel into a particulate hydrogel or into hydrogel-forming powder; and optionally b) treating said particulate hydrogel or said hydrogel-forming powder with a crosslinking substance which, actually or latently, contain at least two functional groups capable of reacting with the carboxyl groups on the addition polymer; characterized by the acrylic acid used in step a) containing less than 400 ppm of acetic acid and propionic acid. It further relates to the hydrogel-forming addition polymers obtainable by the process and to their use.
摘要翻译： 本发明涉及一种制备低气味形成水凝胶的丙烯酸聚合物的方法，其包括以下步骤：a）通过将包含至少50重量％丙烯酸的单体组合物自由基聚合制备聚合物水凝胶 水性聚合介质，并将所述水凝胶转化为颗粒状水凝胶或形成水凝胶形成粉末; 并且任选地b）用实际上或潜在地含有至少两个能够与加成聚合物上的羧基反应的官能团的交联物质处理所述颗粒状水凝胶或所述水凝胶形成粉末; 其特征在于在步骤a）中使用的丙烯酸含有少于400ppm的乙酸和丙酸。 它还涉及可通过该方法获得的水凝胶形成加成聚合物及其用途。
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公开(公告)号：US07179875B2
公开(公告)日：2007-02-20
申请号：US10485484
申请日：2002-08-02
IPC分类号： C08F220/06
CPC分类号： C08F220/06 , A61L15/24 , A61L15/60 , C07C51/215 , C07C51/235 , C07C51/252 , C07C51/43 , C07C51/44 , C07C51/487 , C07C57/04 , C08L33/02
摘要： In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene and/or acrolein. This is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid, and this pure acrylic acid can be subjected directly to a free-radical polymerization.
摘要翻译： 在制备基于丙烯酸的吸水性树脂的方法中，首先从丙烷，丙烯和/或丙烯醛的催化气相氧化反应气体中分离粗丙烯酸。 用醛清除剂进行处理，经处理的粗丙烯酸通过蒸馏分离纯丙烯酸，该纯丙烯酸可直接进行自由基聚合。
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公开(公告)号：US07157598B2
公开(公告)日：2007-01-02
申请号：US10510236
申请日：2003-05-02
CPC分类号： C07C51/412 , C07C51/44 , C07C57/04
摘要： A process prepares an aqueous alkali metal acrylate solution by distillatively removing acrylic acid from a mixture as vapors and taking up the vapors immediately from the gas phase into an aqueous alkali solution.
摘要翻译： 一种方法通过从混合物中蒸馏除去丙烯酸作为蒸气并将蒸气立即从气相中吸收到碱性水溶液中来制备碱金属丙烯酸水溶液。
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