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公开(公告)号：US09796651B2
公开(公告)日：2017-10-24
申请号：US14906292
申请日：2014-07-24
Applicant: Arkema France
Inventor： Michel Fauconet , Roger L. Roundy , Stephane Denis , Samuel M. Daniel
IPC: C07C67/08 , C07C67/327 , C07C51/09 , C07C67/54 , C07C67/62
CPC classification number: C07C67/08 , C07C51/09 , C07C67/327 , C07C67/54 , C07C67/62 , Y02P20/582 , C07C69/54 , C07C57/04
Abstract: The present invention relates to methods by which the thermal dissociation of Michael adducts present in a stream of crude acrylic acid, called “crude ester grade”, and the esterification reaction of acrylic acid present in the stream of crude acrylic acid, or generated in situ by thermal dissociation, with a light alcohol, are carried out simultaneously.
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公开(公告)号：US09403751B2
公开(公告)日：2016-08-02
申请号：US14493559
申请日：2014-09-23
Applicant: Arkema France
Inventor： Serge Tretjak , Stephane Denis
Abstract: The invention relates to a liquid-liquid extraction process, comprising: the provision of a main input liquid stream, comprising at least one compound of interest and an excess compound; the provision of a liquid scrubbing stream; the extraction of the excess compound from the main input liquid stream by contact with the liquid scrubbing stream, making it possible to collect a main output liquid stream, depleted in excess compound with respect to the main input liquid stream; in which: the main input liquid stream and the liquid scrubbing stream exhibit a difference in density of less than or equal to 50 kg/m3 and also an interfacial tension of less than or equal to 3 dyn/cm; and the extraction stage is carried out in a packed contactor with a ratio by weight as input liquid scrubbing stream/main liquid stream ranging from 0.3 to 0.5. The invention also relates to a process for the production of acrylic ester in which the production stream is treated by means of the above liquid-liquid extraction process.
Abstract translation: 本发明涉及一种液体 - 液体提取方法，包括：提供主要输入液体流，其包含至少一种目标化合物和过量化合物; 提供液体洗涤流; 通过与液体洗涤流接触从主输入液体流中提取过量化合物，使得可以收集相对于主要输入液体流消耗过量化合物的主要输出液体流; 其中：主输入液体流和液体洗涤流表现出小于或等于50kg / m 3的密度差，以及小于或等于3达因/厘米的界面张力; 并且萃取阶段在填充接触器中进行，重量比为输入液体洗涤流/主液流，范围为0.3至0.5。 本发明还涉及生产丙烯酸酯的方法，其中通过上述液 - 液萃取方法处理生产流。
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公开(公告)号：US09975842B2
公开(公告)日：2018-05-22
申请号：US15329910
申请日：2015-06-22
Applicant: Arkema France
Inventor： Anne Moreliere , Gilles Frimour , Jean-Michel Paul , Stephane Denis
CPC classification number: C07C67/08 , C07C67/54 , Y02P20/582 , C07C69/54
Abstract: The present invention relates to a method for producing a C4-C10 alkyl (meth)acrylate, by direct esterification of (meth)acrylic acid by the corresponding alcohol, the reaction water being removed in the form of an azeotrope with the esterification alcohol from a distillation column mounted over the esterification reactor comprising a cationic resin as a catalyst. Said method is characterized in that the molar ratio of alcohol to acid at the inlet of the reactor is between 1.4 and 3, and in that the crude reaction mixture circulates in a recirculation loop joining the reactor and the water removal column, at a recirculation rate of between 6 and 25, expressed by the mass ratio between the flow fed into the loop and the flow sent to a purification treatment.
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公开(公告)号：US09908838B2
公开(公告)日：2018-03-06
申请号：US15032864
申请日：2014-10-21
Applicant: Arkema France
Inventor： Serge Tretjak , Stephane Denis , Lionel Delais , Anne Moreliere
CPC classification number: C07C67/08 , C07C45/52 , C07C51/44 , C07C51/487 , C07C67/54 , C07C67/58 , Y02P20/582 , C07C47/22 , C07C57/04 , C07C69/54
Abstract: The subject matter of the present invention is an improvement in the continuous production of methyl (meth)acrylate or of ethyl (meth)acrylate by direct esterification of (meth)acrylic acid with methanol or ethanol, under reaction conditions for which the acid is in excess relative to the alcohol, in particular with an acid/alcohol molar ratio of between 1.0 and 4, and under a pressure ranging from atmospheric pressure to 5 bar. The process of the invention makes it possible to minimize the formation of ethyl ethoxypropionate during the esterification reaction, and results in an improvement in the material balance, simplification of the purification train for the desired ester, and optimization of the energy balance.
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