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    • 2. 发明授权
    • Production process of cross-linked polyaspartic acid resin
    • 交联聚天冬氨酸树脂的生产工艺
    • US6072024A
    • 2000-06-06
    • US42942
    • 1998-03-17
    • Yoshihiro IrizatoMakoto SukegawaToshio KatohHiroaki TamataniAkinori NagatomoMasaru Wada
    • Yoshihiro IrizatoMakoto SukegawaToshio KatohHiroaki TamataniAkinori NagatomoMasaru Wada
    • C08G73/10C08G69/10
    • C08G73/1092
    • A process is disclosed for producing with good productivity a cross-linked polyaspartic acid resin having biodegradability and high water absorbency. The process features inclusion of one of the following steps: (a) a polysuccinimide, which has been brought into a dispersed state by a dispersant, and a cross-linking agent are reacted to produce the cross-linked polyaspartic acid resin; (b) imide rings of a cross-linked polysuccinimide are subjected to a hydrolysis reaction while controlling a swelling degree of a resulting gel, whereby the cross-linked polyaspartic acid resin is produced; and (c) a gel of a cross-linked polysuccinimide, which has been obtained by reacting a cross-linking agent to a solution of a polysuccinimide in an organic solvent, is disintegrated to subject imide rings of the cross-linked polysuccinimide to a hydrolysis reaction, so that the cross-linked polyaspartic acid resin is produced. The process may also include one or both of the following steps as needed: (d) a gel of the cross-linked polyaspartic acid resin is washed with water and/or a water-miscible organic solvent; and (e) the polysuccinimide is produced using a basic amino acid as a cross-linking agent.
    • 公开了一种具有生物降解性和高吸水性的交联聚天冬氨酸树脂以高生产率生产的方法。 该方法包括以下步骤之一:(a)已经通过分散剂进入分散状态的聚琥珀酰亚胺和交联剂反应生成交联聚天冬氨酸树脂; (b)交联聚琥珀酰亚胺的酰亚胺环进行水解反应同时控制所得凝胶的溶胀度,从而制得交联聚天冬氨酸树脂; 和(c)通过使交联剂与聚琥珀酰亚胺在有机溶剂中的溶液反应而获得的交联聚琥珀酰亚胺的凝胶被分解以使交联的聚琥珀酰亚胺的酰亚胺环进行水解 反应,制成交联聚天冬氨酸树脂。 该方法还可以根据需要包括以下步骤中的一种或两种:(d)用水和/或水混溶性有机溶剂洗涤交联聚天冬氨酸树脂的凝胶; 和(e)使用碱性氨基酸作为交联剂制备聚琥珀酰亚胺。
    • 5. 发明授权
    • Method for producing carboxylic acid chloride
    • 羧酸氯化物的制备方法
    • US08198482B2
    • 2012-06-12
    • US12529307
    • 2008-02-27
    • Takeshi KobayashiKiyomi KidoAkinori Nagatomo
    • Takeshi KobayashiKiyomi KidoAkinori Nagatomo
    • C07C51/58
    • C07C51/60C07C51/64C07C55/36
    • This invention relates to a method for producing a carboxylic acid chloride, which efficiently decomposes a Vilsmeier reagent type compound in a carboxylic acid chloride lacking a thermal stability or a carboxylic acid chloride hardly distilled in practice due to a high boiling point with a simple operation and has no adverse effect on a subsequent step, and more particularly to a method for producing a carboxylic acid chloride, characterized by comprising reacting a carboxylic acid with a chlorinating agent in the presence of a catalyst, removing the excessive chlorinating agent from a reaction system after the reaction, and then further adding 1.0 to 3.0 equivalents of the starting carboxylic acid based on the catalyst to the reaction system to decompose a Vilsmeier reagent type compound remaining in the reaction system.
    • 本发明涉及一种生产羧酸氯化物的方法,该方法通过简单的操作由于沸点高而在实际上难以蒸馏的Vilsmeier试剂型化合物在不具有热稳定性的羧酸氯化物或羧酸氯化物中有效分解, 对后续步骤没有不利影响,更具体地说,涉及一种制备羧酰氯的方法,其特征在于包括在催化剂存在下使羧酸与氯化剂反应,在反应体系之后从反应体系中除去过量的氯化剂 反应,然后将基于催化剂的1.0〜3.0当量的起始羧酸加入到反应体系中以分解残留在反应体系中的Vilsmeier试剂型化合物。
    • 10. 发明授权
    • Process for preparing hydroxybenzoic acids
    • 制备羟基苯甲酸的方法
    • US06392090B1
    • 2002-05-21
    • US08938833
    • 1997-09-26
    • Masayuki FuruyaAkinori NagatomoMasaru Wada
    • Masayuki FuruyaAkinori NagatomoMasaru Wada
    • C07C5115
    • C07C51/15C07C65/05
    • A process for preparing a hydroxybenzoic acid is herein disclosed which comprises reacting a phenol with an alkali metal compound by the use of an aprotic polar organic solvent as a reaction solvent to form an alkali metal salt of the phenol, and then reacting this alkali metal salt with carbon dioxide to obtain a hydroxybenzoic acid, said process comprising the step of carrying out the reaction under conditions that a molar ratio of the phenol to the total of the alkali metal compound and the aprotic polar organic solvent is larger than 1. Furthermore, the process may contain the steps of precipitating crystals from the reaction solution, separating the solid from the solution to obtain a wet alkali metal salt of the hydroxybenzoic acid, dissolving the wet alkali metal salt in water, and precipitating crystals from the solution by acidification to obtain the hydroxybenzoic acid.
    • 本文公开了一种制备羟基苯甲酸的方法,其包括通过使用非质子极性有机溶剂作为反应溶剂使苯酚与碱金属化合物反应以形成苯酚的碱金属盐,然后使该碱金属盐 与二氧化碳反应以获得羟基苯甲酸,所述方法包括在苯酚与碱金属化合物和非质子极性有机溶剂的总量的摩尔比大于1的条件下进行反应的步骤。此外, 方法可以包括从反应溶液中析出晶体的步骤,从溶液中分离固体,得到羟基苯甲酸的湿碱金属盐,将湿碱金属盐溶解在水中,并通过酸化从溶液中沉淀出晶体,得到 羟基苯甲酸。