公开(公告)号：US4324926A

公开(公告)日：1982-04-13

申请号：US127774

申请日：1980-03-06

申请人： Walter R. Demler ,  Krishen L. Nagpal ,  Richard M. Dollard ,  Eugene Odin ,  Donald T. Donahue

发明人： Walter R. Demler ,  Krishen L. Nagpal ,  Richard M. Dollard ,  Eugene Odin ,  Donald T. Donahue

IPC分类号： C07C27/00 ,  C07C37/86 ,  C07C39/15 ,  C07C67/00 ,  C07C37/82 ,  C07C39/21

CPC分类号： C07C37/86

摘要： A process for purifying 4,4'-dihydroxydiphenyl comprising contacting a solution of 4,4'-dihydroxydiphenyl alkali metal salt with activated carbon followed by removing the activated carbon from the solution and acidifying the solution with sufficient acid to convert essentially all of the 4,4'-dihydroxydiphenyl alkali metal salt to water insoluble 4,4'-dihydroxydiphenyl and 4,4'-dihydroxydiphenyl product containing less than 0.45 weight percent of 4-monohydroxydiphenyl impurity.

摘要翻译： 一种纯化4,4'-二羟基二苯基的方法，包括使4,4'-二羟基二苯基碱金属盐与活性碳的溶液接触，然后从溶液中除去活性炭，并用足够的酸酸化该溶液，基本上将所有4 ，4'-二羟基二苯基碱金属盐转化为水不溶性的4,4'-二羟基二苯基和4,4'-二羟基二苯基产​​物，其含有小于0.45重量％的4-单羟基二苯基杂质。

公开(公告)号：US4243822A

公开(公告)日：1981-01-06

申请号：US71572

申请日：1979-08-31

申请人： Walter R. Demler ,  Krishen L. Nagpal ,  Richard M. Dollard ,  Eugene Odin ,  Donald T. Donahue

发明人： Walter R. Demler ,  Krishen L. Nagpal ,  Richard M. Dollard ,  Eugene Odin ,  Donald T. Donahue

IPC分类号： C07C27/00 ,  C07C37/04 ,  C07C37/055 ,  C07C37/64 ,  C07C37/66 ,  C07C39/15 ,  C07C39/235 ,  C07C67/00 ,  C07C4/02 ,  C07C2/58

CPC分类号： C07C37/04 ,  C07C37/055 ,  C07C37/64

摘要： A process for the preparation of 4,4' dihydroxydiphenyl by acidifying an alkali metal salt of 4,4' dihydroxydiphenyl. The alkali metal salt of 4,4' dihydroxydiphenyl is prepared by fusion of an alkali metal hydroxide with alkali metal diphenyl 4,4' disulfonic acid. Because the reaction may be carried out in granular form, or in a reaction which is made highly fluid by using potassium hydroxide with potassium diphenyl 4,4' disulfonic acid, or by reacting the alkali metal 4,4' disulfonic acid in increments with the hydroxide, low molar ratios of hydroxide to alkali metal diphenyl 4'4, disulfonic acid may be used. When potassium diphenyl 4,4' disulfonic acid is used in accordance with the invention, it is prepared by reacting 4,4' diphenyl disulfonic acid with an inorganic neutral potassium salt.

摘要翻译： 通过酸化4,4'-二羟基二苯基的碱金属盐制备4,4'-二羟基二苯基的方法。 4,4'二羟基二苯基的碱金属盐通过碱金属氢氧化物与碱金属二苯基4,4'-二磺酸的熔融制备。 因为反应可以以颗粒形式进行，也可以通过使用氢氧化钾与二苯基4,4'-二磺酸钾进行高度流动的反应，或者使碱金属4,4'二磺酸与 可以使用氢氧化物，低摩尔比的氢氧化物与碱金属二苯基4'4，二磺酸。 当根据本发明使用二苯基4,4'二磺酸钾时，其通过使4,4'-二苯基二磺酸与无机中性钾盐反应来制备。

公开(公告)号：US4350827A

公开(公告)日：1982-09-21

申请号：US300196

申请日：1981-09-08

申请人： Walter R. Demler ,  Eugene Odin

发明人： Walter R. Demler ,  Eugene Odin

IPC分类号： C07C51/02 ,  C07C51/295 ,  C07C51/42 ,  C07C65/01

CPC分类号： C07C51/295 ,  C07C51/02 ,  C07C51/42

摘要： A method for recovering purified m-hydroxybenzoic acid from crude m-hydroxybenzoic acid alkali metal salt. The method comprises dissolving the crude m-hydroxy benzoic acid alkali metal salt in water at a ratio of between about 13 and 20 milliliters of water per gram of pure m-hydroxybenzoic acid alkali metal salt contained in the crude salt; acidifying the resulting solution to a pH of below 2 with a mineral acid to neutralize all alkali metal hydroxide present and to convert the m-hydroxybenzoic acid alkali metal salt to free m-hydroxybenzoic acid; and cooling the solution to from about 0.degree. C. to about 15.degree. C. for a sufficient time to crystallize purified m-hydroxybenzoic acid from the solution.The method is particularly effective for removing impurities of parahydroxybenzoic acid, alkali metal hydroxide and water soluble inorganic salts.

摘要翻译： 从粗间羟基苯甲酸碱金属盐中回收纯化的间羟基苯甲酸的方法。 该方法包括将粗制的间羟基苯甲酸碱金属盐以约13-20毫升水/克纯盐中所含的纯间羟基苯甲酸碱金属盐的比例溶解在水中; 用无机酸将所得溶液酸化至pH2以下，以中和所有存在的碱金属氢氧化物并将间羟基苯甲酸碱金属盐转化成游离的间羟基苯甲酸; 并将溶液冷却至约0℃至约15℃，持续足够的时间以从溶液中结晶纯化的间羟基苯甲酸。 该方法特别有效地除去对羟基苯甲酸，碱金属氢氧化物和水溶性无机盐的杂质。