公开(公告)号：EP0770054B1

公开(公告)日：1999-07-14

申请号：EP95920603.8

申请日：1995-05-23

申请人： ALBEMARLE CORPORATION

发明人： LIN, Ronny, W. ,  ATKINSON, Eldon, E., Jr. ,  LAYMAN, William, J., Jr.

IPC分类号： C07C227/18 ,  C07C227/40 ,  C07C229/24

CPC分类号： C07C229/24 ,  C07C227/18 ,  C07C227/38

摘要： This invention relates to a method for converting calcium salts of [S,S]-ethylenediamine-N,N'-disuccinic acid to an easily filterable precipitate of [S,S]-ethylenediamine-N,N'-disuccinic acid comprising: co-feeding, to a volume of water, calcium [S,S]-ethylenediamine-N,N'-disuccinic acid salt and aqueous mineral acid, the mineral acid having a dissociation constant within the range of from about 1.0 x 10 to about 1.0 x 10 , wherein the feed rates of the calcium salt and the aqueous mineral acid are controlled so that the volume of water has a pH within the range of from about 1.4 to about 7 at least substantially throughout the co-feed period.

公开(公告)号：EP0770055A1

公开(公告)日：1997-05-02

申请号：EP95921386.0

申请日：1995-05-23

申请人： ALBEMARLE CORPORATION

发明人： LIN, Ronny, W. ,  ATKINSON, Eldon, E., Jr. ,  BALHOFF, Donald, E.

IPC分类号： C07C227 ,  C07C229

CPC分类号： C07C227/40

摘要： This invention relates to a method for obtaining [S,S]-ethylenediamine-N,N'-disuccinic acid precipitate from an aqueous solution of the salts of such acid and L-aspartic acid.

公开(公告)号：EP0770056B1

公开(公告)日：2001-01-03

申请号：EP95919241.0

申请日：1995-05-23

申请人： ALBEMARLE CORPORATION

发明人： LIN, Ronny, W. ,  ATKINSON, Eldon, E., Jr. ,  BALHOFF, Donald, E.

IPC分类号： C07C229/24 ,  C07C227/18

CPC分类号： C07C227/18

摘要： This invention relates to a process for selectively producing and recovering [S,S]-ethylenediamine-N,N'-disuccinic acid by the reaction of L-aspartic acid and 1,2-dihaloethane in an aqueous medium, wherein a stoichiometric deficiency of 1,2-dihaloethane is used and wherein the resultant aqueous solution obtained from the reaction is co-fed to water with a mineral acid to preferentially precipitate out [S,S]-ethylenediamine-N,N'-disuccinic acid from the solution.

公开(公告)号：EP0770055B1

公开(公告)日：1999-07-14

申请号：EP95921386.9

申请日：1995-05-23

申请人： ALBEMARLE CORPORATION

发明人： LIN, Ronny, W. ,  ATKINSON, Eldon, E., Jr. ,  BALHOFF, Donald, E.

IPC分类号： C07C227/40 ,  C07C229/24

CPC分类号： C07C227/40

摘要： This invention relates to a method for obtaining [S,S]-ethylenediamine-N,N'-disuccinic acid precipitate from an aqueous solution of the salts of such acid and L-aspartic acid.

公开(公告)号：EP0770056A1

公开(公告)日：1997-05-02

申请号：EP95919241.0

申请日：1995-05-23

申请人： ALBEMARLE CORPORATION

发明人： LIN, Ronny, W. ,  ATKINSON, Eldon, E., Jr. ,  BALHOFF, Donald, E.

IPC分类号： C07B53 ,  C07C227 ,  C07C229 ,  C09K3

CPC分类号： C07C227/18

摘要： This invention relates to a process for selectively producing and recovering [S,S]-ethylenediamine-N,N'-disuccinic acid by the reaction of L-aspartic acid and 1,2-dihaloethane in an aqueous medium, wherein a stoichiometric deficiency of 1,2-dihaloethane is used and wherein the resultant aqueous solution obtained from the reaction is co-fed to water with a mineral acid to preferentially precipitate out [S,S]-ethylenediamine-N,N'-disuccinic acid from the solution.

摘要翻译： 本发明涉及一种通过L-天冬氨酸和1,2-二卤代乙烷在含水介质中反应选择性生产和回收[S，S] - 乙二胺-N，N'-二琥珀酸的方法，其中化学计量不足 使用1,2-二卤代乙烷，其中将由反应得到的所得水溶液与无机酸共同加入水中以优先从溶液中沉淀出[S，S] - 乙二胺-N，N'-二琥珀酸。

公开(公告)号：EP0770054A1

公开(公告)日：1997-05-02

申请号：EP95920603.0

申请日：1995-05-23

申请人： ALBEMARLE CORPORATION

发明人： LIN, Ronny, W. ,  ATKINSON, Eldon, E., Jr. ,  LAYMAN, William, J., Jr.

IPC分类号： C07B53 ,  C07C227 ,  C07C229

CPC分类号： C07C229/24 ,  C07C227/18 ,  C07C227/38

摘要： This invention relates to a method for converting calcium salts of [S,S]-ethylenediamine-N,N'-disuccinic acid to an easily filterable precipitate of [S,S]-ethylenediamine-N,N'-disuccinic acid comprising: co-feeding, to a volume of water, calcium [S,S]-ethylenediamine-N,N'-disuccinic acid salt and aqueous mineral acid, the mineral acid having a dissociation constant within the range of from about 1.0 x 10-5 to about 1.0 x 1010, wherein the feed rates of the calcium salt and the aqueous mineral acid are controlled so that the volume of water has a pH within the range of from about 1.4 to about 7 at least substantially throughout the co-feed period.