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1.发明申请IMPROVED MANUFACTURING PROCESS FOR DIHYDROXYDIPHENYLMETHANE WITH HIGH SELECTIVITY FOR 2,4'- DIHYDROXYDIPHENYLMETHANE 审中-公开用于2,4'-二羟基二苯基甲烷的高选择性的二羟基二苯基甲烷改进的制造方法公开(公告)号：US20160229775A1
公开(公告)日：2016-08-11
申请号：US15023334
申请日：2013-09-20
发明人： Kumar Dubey Pradip , Alok Khullar , Thipa Naiyawat , Kamonsun Visatsingh , Patcharin Samuthsen , Pankaj Mathure
IPC分类号： C07C37/20
摘要： The invention relates to an improved manufacturing process for the preparation of high 2, 4′-dihydroxydiphenylmethane, by a process involving reaction of phenol and formaldehyde, in the presence of an inorganic polyprotic acid. According to this process, the reaction conditions are selected to favour a high yield of dihydroxydiphenylmethane, with a relatively high concentration of the 2,4′-isomer, by using a relatively low molar excess of phenol than conventional methods.
摘要翻译： 本发明涉及通过在无机多磷酸存在下通过苯酚和甲醛反应的方法制备高的2,4'-二羟基二苯基甲烷的改进的制备方法。 根据该方法，通过使用比常规方法使用相对低摩尔过量的苯酚，选择反应条件有利于高产率的2,4'-异构体的相对高浓度的二羟基二苯基甲烷。
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公开(公告)号：US10683250B2
公开(公告)日：2020-06-16
申请号：US15023334
申请日：2013-09-20
发明人： Kumar Dubey Pradip , Alok Khullar , Thipa Naiyawat , Kamonsun Visatsingh , Patcharin Samuthsen , Pankaj Mathure
IPC分类号： C07C37/20
摘要： The invention relates to an improved manufacturing process for the preparation of high 2,4′-dihydroxydiphenylmethane, by a process involving reaction of phenol and formaldehyde, in the presence of an inorganic polyprotic acid. According to this process, the reaction conditions are selected to favour a high yield of dihydroxydiphenylmethane, with a relatively high concentration of the 2,4′-isomer, by using a relatively low molar excess of phenol than conventional methods.
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