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公开(公告)号：US20210403404A1
公开(公告)日：2021-12-30
申请号：US16613942
申请日：2018-05-24
发明人： Reetam Chakrabarti , Sarah L. Hruby , Dmitry A. Krapchetov , Minh N. Ngo , Muhunthan Sathiosatham , Mark A. Silvano
摘要： Provided is a process for preparing dry methacrolein which maximizes capture of methanol. Also provided is a process for producing methyl methacrylate.
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公开(公告)号：US09963419B2
公开(公告)日：2018-05-08
申请号：US15521762
申请日：2015-10-02
CPC分类号： C07C67/54 , B01D3/4205 , C02F1/008 , C02F1/04 , C02F2103/38 , C07C67/39 , C07C67/40 , C07C69/54
摘要： A process for removing water from an oxidative esterification reactor includes (a) conducting an oxidative esterification reaction in a reactor; (b) removing a crude product stream from the reactor; (c) passing a first portion of the crude product stream directly to a product recovery zone; (d) introducing a second portion of the crude product stream to a distillation column to generate a column overheads stream and a column bottoms stream; (e) passing at least a portion of the columns bottoms stream to the product recovery zone; and (f) recycling a recycle stream comprising at least a portion of the overheads stream to the reactor; wherein the recycle stream contains less than 1 weight percent (wt %) water based on the total weight of the recycle stream, wherein the weight ratio of the first portion to the second portion is at least 1:10, and wherein the amount of the recycle stream recycled to the reactor is such that the reactor contains less than or equal to 2.5 wt % water, based on the weight of the reactor contents.
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公开(公告)号：US20160244395A1
公开(公告)日：2016-08-25
申请号：US15028109
申请日：2014-10-14
发明人： Leonard E. Bogan, Jr. , Mark A. Silvano , Raymond P. Roach , Sarah M. Hoyt , Robert Tengler , David C. Decoster , Sanjib Biswas , Muhunthan Sathiosatham , Sarah L. Hruby , Andrew M. Lemonds
IPC分类号： C07C51/377 , B01J27/24
CPC分类号： C07C51/377 , B01J27/24 , C07C57/04
摘要： Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammonium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acrylic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisulfate reduces or eliminates the problems associated with processes that use sulfuric acid as a dehydrating catalyst, e.g, excess sulfuric acid consumption and/or recovery.
摘要翻译： 通过使用包含硫酸氢铵的催化剂的方法将羟基羧酸例如3-羟基丙酸和/或其铵盐脱水成相应的不饱和羧酸，例如丙烯酸。 使用硫酸氢铵减少或消除了与使用硫酸作为脱水催化剂的方法相关的问题，例如过量的硫酸消耗和/或回收。
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公开(公告)号：US10703704B2
公开(公告)日：2020-07-07
申请号：US15521785
申请日：2015-10-02
摘要： A process for continuously removing water in situ from an oxidative esterification reaction is provided. The process includes (a) conducting a first oxidative esterification reaction in a first reactor or reaction zone, wherein the total number of reactors or reaction zones is n and n is at least 2; (b) removing a crude product stream from the first reactor or reaction zone; (c) introducing the crude product stream to a distillation column to generate a column overheads stream and a column bottoms stream; (d) passing a portion of the columns bottoms stream to the product recovery zone; and (e) passing a portion of the column overheads stream to a subsequent reactor or reaction zone. Steps (a)-(e) can be repeated.
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公开(公告)号：US20200181053A1
公开(公告)日：2020-06-11
申请号：US16614512
申请日：2018-05-24
发明人： Reetam Chakrabarti , Charles Como , Sarah L. Hruby , Dmitry A. Krapchetov , Minh N. Ngo , Muhunthan Sathiosatham , Mark A. Silvano
摘要： Provided is a process for preparing dry methacrolein which maximizes capture of methanol. Also provided is a process for producing methyl methacrylate.
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公开(公告)号：US20170240500A1
公开(公告)日：2017-08-24
申请号：US15521762
申请日：2015-10-02
CPC分类号： C07C67/54 , B01D3/4205 , C02F1/008 , C02F1/04 , C02F2103/38 , C07C67/39 , C07C67/40 , C07C69/54
摘要： A process for removing water from an oxidative esterification reactor includes (a) conducting an oxidative esterification reaction in a reactor; (b) removing a crude product stream from the reactor; (c) passing a first portion of the crude product stream directly to a product recovery zone; (d) introducing a second portion of the crude product stream to a distillation column to generate a column overheads stream and a column bottoms stream; (e) passing at least a portion of the columns bottoms stream to the product recovery zone; and (f) recycling a recycle stream comprising at least a portion of the overheads stream to the reactor; wherein the recycle stream contains less than 1 weight percent (wt %) water based on the total weight of the recycle stream, wherein the weight ratio of the first portion to the second portion is at least 1:10, and wherein the amount of the recycle stream recycled to the reactor is such that the reactor contains less than or equal to 2.5 wt % water, based on the weight of the reactor contents.
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公开(公告)号：US20200157032A1
公开(公告)日：2020-05-21
申请号：US16616116
申请日：2018-05-24
摘要： Provided is a process for preparing methacrolein which maximizes capture of methanol. Also provided are processes for producing methacrylic acid and methyl methacrylate.
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公开(公告)号：US20200140363A1
公开(公告)日：2020-05-07
申请号：US16615841
申请日：2018-05-24
摘要： Provided is a process for preparing methacrolein which maximizes capture of methanol. Also provided are processes for producing methacrylic acid and methyl methacrylate.
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公开(公告)号：US09701610B2
公开(公告)日：2017-07-11
申请号：US15028109
申请日：2014-10-14
发明人： Leonard E. Bogan, Jr. , Mark A. Silvano , Raymond P. Roach , Sarah M. Hoyt , Robert Tengler , David C. Decoster , Sanjib Biswas , Muhunthan Sathiosatham , Sarah L. Hruby , Andrew M. Lemonds
IPC分类号： C07C51/377 , B01J27/24 , C07C57/04
CPC分类号： C07C51/377 , B01J27/24 , C07C57/04
摘要： Hydroxycarboxylic acids, e.g., 3-hydroxypropionic acid, and/or their ammonium salts are dehydrated to their corresponding unsaturated carboxylic acids, e.g., acrylic acid, by a process that uses a catalyst comprising ammonium bisulfate. The use of ammonium bisulfate reduces or eliminates the problems associated with processes that use sulfuric acid as a dehydrating catalyst, e.g, excess sulfuric acid consumption and/or recovery.
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公开(公告)号：US10723685B2
公开(公告)日：2020-07-28
申请号：US16615841
申请日：2018-05-24
摘要： Provided is a process for preparing methacrolein which maximizes capture of methanol. Also provided are processes for producing methacrylic acid and methyl methacrylate.
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