Production of D,L-aspartic acid
    2.
    发明授权
    Production of D,L-aspartic acid 失效
    生产D,L-天冬氨酸

    公开(公告)号:US5872285A

    公开(公告)日:1999-02-16

    申请号:US661054

    申请日:1996-06-10

    CPC分类号: C07C227/08

    摘要: The present invention is directed to a method for the production of D,L-aspartic acid. The method comprises reacting an unsaturated dicarboxylic acid or anhydride, such as, maleic acid, fumaric acid, maleic anhydride, or mixtures thereof, with excess aqueous ammonia at an elevated temperature and pressure for a time sufficient to produce diammonium D,L-aspartate. The produced diammonium D,L-aspartate is then neutralized to D,L-aspartic acid. Excess unreacted ammonia and various by-products may be recycled and re-used in the method, thereby minimizing waste and reducing cost. The produced D,L-aspartic acid may be subsequently used to make polyaspartic acid.

    摘要翻译: 本发明涉及一种生产D,L-天冬氨酸的方法。 该方法包括使不饱和二羧酸或酸酐如马来酸,富马酸,马来酸酐或其混合物与过量氨水在升高的温度和压力下反应足以产生二铵D,L-天冬氨酸的时间。 然后将所产生的二铵D,L-天冬氨酸中和至D,L-天冬氨酸。 过量的未反应的氨和各种副产物可以在该方法中被再循环和重新使用,从而最小化浪费并降低成本。 产生的D,L-天冬氨酸可以随后用于制备聚天冬氨酸。

    Solution polymerizing aspartic acid and monomer to form succinimide copolymer
    3.
    发明授权
    Solution polymerizing aspartic acid and monomer to form succinimide copolymer 失效
    溶液聚合天冬氨酸和单体形成琥珀酰亚胺共聚物

    公开(公告)号:US06399715B2

    公开(公告)日:2002-06-04

    申请号:US09799230

    申请日:2001-03-05

    IPC分类号: C08G7310

    CPC分类号: C08G73/1092

    摘要: A method for the preparation of a succinimide copolymer by the catalytic co-polymerization of aspartic acid with a selected polyfunctional monomer in the presence of a cyclic carbonate solvent. Succinimide copolymers of relatively high weight average molecular weight and high purity can be produced in relatively high yields while employing a relatively low catalyst loading.

    摘要翻译: 一种通过在环状碳酸酯溶剂存在下天冬氨酸与所选择的多官能单体的催化共聚合制备琥珀酰亚胺共聚物的方法。 相对高的重均分子量和高纯度的琥珀酰亚胺共聚物可以以相当高的产率生产,同时采用相对较低的催化剂负载量。

    Production of succinimide copolymers in cyclic carbonate solvent
    4.
    发明授权
    Production of succinimide copolymers in cyclic carbonate solvent 失效
    在环状碳酸酯溶剂中生产琥珀酰亚胺共聚物

    公开(公告)号:US06197897B1

    公开(公告)日:2001-03-06

    申请号:US09357682

    申请日:1999-07-20

    IPC分类号: C08G7310

    CPC分类号: C08G73/1092

    摘要: A method for the preparation of a succinimide copolymer by the catalytic co-polymerization of aspartic acid with a selected polyfunctional monomer in the presence of a cyclic carbonate solvent. Succinimide copolymers of relatively high weight average molecular weight and high purity can be produced in relatively high yields while employing a relatively low catalyst loading.

    摘要翻译: 一种通过在环状碳酸酯溶剂存在下天冬氨酸与所选择的多官能单体的催化共聚合制备琥珀酰亚胺共聚物的方法。 相对高的重均分子量和高纯度的琥珀酰亚胺共聚物可以以相当高的产率生产,同时采用相对较低的催化剂负载量。

    Production of polysuccinimide and polyaspartate in thioether solvents
    5.
    发明授权
    Production of polysuccinimide and polyaspartate in thioether solvents 失效
    在硫醚溶剂中生产聚琥珀酰亚胺和聚天冬氨酸酯

    公开(公告)号:US5939522A

    公开(公告)日:1999-08-17

    申请号:US924276

    申请日:1997-09-05

    IPC分类号: C08G73/10

    CPC分类号: C08G73/1092 Y02P20/582

    摘要: A method for the preparation of a desired molecular weight polysuccinimide by the catalytic polymerization of aspartic acid in the presence of a thioether solvent. Polysuccinimide of relatively high weight average molecular weight and high purity can be produced in relatively high yields while employing a relatively low catalyst loading and relatively low temperatures.

    摘要翻译: 一种在硫醚溶剂存在下通过天冬氨酸的催化聚合制备所需分子量聚琥珀酰亚胺的方法。 相对高的重均分子量和高纯度的聚琥珀酰亚胺可以以相当高的产率生产,同时采用相对低的催化剂负载量和较低的温度。

    Production of succinimide copolymers in cyclic carbonate solvent
    6.
    发明授权
    Production of succinimide copolymers in cyclic carbonate solvent 失效
    在环状碳酸酯溶剂中生产琥珀酰亚胺共聚物

    公开(公告)号:US5939517A

    公开(公告)日:1999-08-17

    申请号:US6255

    申请日:1998-01-13

    IPC分类号: C08G73/10 C08G73/14 C08G73/16

    CPC分类号: C08G73/1092

    摘要: A method for the preparation of a succinimide copolymer by the catalytic co-polymerization of aspartic acid with a selected polyfunctional monomer in the presence of a cyclic carbonate solvent. Succinimide copolymers of relatively high weight average molecular weight and high purity can be produced in relatively high yields while employing a relatively low catalyst loading.

    摘要翻译: 一种通过在环状碳酸酯溶剂存在下天冬氨酸与所选择的多官能单体的催化共聚合制备琥珀酰亚胺共聚物的方法。 相对高的重均分子量和高纯度的琥珀酰亚胺共聚物可以以相当高的产率生产,同时采用相对较低的催化剂负载量。

    Production of polysuccinimide
    9.
    发明授权
    Production of polysuccinimide 失效
    生产聚琥珀酰亚胺

    公开(公告)号:US5466779A

    公开(公告)日:1995-11-14

    申请号:US243955

    申请日:1994-05-17

    申请人: Robert J. Ross

    发明人: Robert J. Ross

    IPC分类号: C08G69/48 C08G73/10 C08G69/00

    CPC分类号: C08G73/1092

    摘要: Polysuccinimide is prepared by reacting ammonia gas with liquid maleic anhydride. The reaction is initially carried out at a temperature which is above the melting point of the maleic anhydride but below the boiling point of liquid maleic anhydride for a time period sufficient for the liquid maleic anhydride to react with the ammonia gas to form a reaction product thereof. The reaction product is subsequently polymerized to polysuccinimide. The present method avoids the prior art problems of water removal and minimizes the need for ammonia handling equipment. The polysuccinimide product can be readily hydrolyzed to polyaspartic acid or a salt thereof, if desired.

    摘要翻译: 聚氨基琥珀酰亚胺通过氨气与液体马来酸酐反应制备。 反应最初在高于马来酸酐的熔点但低于液体马来酐的沸点的温度下进行足够长的时间,以使液体马来酸酐与氨气反应形成其反应产物 。 反应产物随后聚合成聚琥珀酰亚胺。 本方法避免了现有技术的除水问题,并最大限度地减少了对氨处理设备的需求。 如果需要,聚琥珀酰亚胺产物可以容易地水解成聚天冬氨酸或其盐。