会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 5. 发明授权
    • Process of preparing alkylhydroxyalkylcellulose
    • 制备烷基羟烷基纤维素的方法
    • US07402668B2
    • 2008-07-22
    • US10197070
    • 2002-07-17
    • Wolfgang DannhornErik-Andreas KlohrMartin KowollikHartwig SchlesigerJörn-Bernd Pannek
    • Wolfgang DannhornErik-Andreas KlohrMartin KowollikHartwig SchlesigerJörn-Bernd Pannek
    • C07H1/00C08B11/08C08B11/02C08B1/00
    • C08B11/193
    • A process of preparing alkylhydroxyalkylcellulose (e.g., methylhydroxyethylcellulose and methylhydroxypropylcellulose) by reaction of cellulose in the presence of alkali metal hydroxide with an alkylating agent and a hydroxyalkylating agent is described. The process includes: (a) alkalizing cellulose by means of 0.9 to 2.9 equivalents of an alkali metal hydroxide I/AGU of the cellulose in the form of an aqueous alkali metal hydroxide solution, in the presence of a suspension medium containing at least 0.2 equivalents of an alkylating agent I/AGU of the cellulose; (b) reacting the alkalized cellulose of step (a) with alkylating agent I and a hydroxyalkylating agent at a temperature above 65° C.; (c) adding additional alkali metal hydroxide 11 in the form of an aqueous alkali metal hydroxide solution; and (d) adding additional alkylating agent 11 in an amount of at least the absolute value of the difference between (i) the number of equivalents of alkylating agent I/AGU of the cellulose already added, and (ii) the total number of equivalents of alkali metal hydroxide/AGU of the cellulose added. Additional alkylating agent 11 is not added in step (d) if (i) the number of equivalents of alkylating agent I/AGU of the cellulose already added exceeds (ii) the total number of equivalents of alkali metal hydroxide/AGU of the cellulose already added. In a further step (e), the alkylhydroxyalkylcellulose is isolated from the reaction mixture. The isolated alkylhydroxyalkylcellulose may be optionally purified.
    • 描述了通过在碱金属氢氧化物存在下纤维素与烷基化剂和羟烷基化剂反应来制备烷基羟烷基纤维素(例如甲基羟乙基纤维素和甲基羟丙基纤维素)的方法。 该方法包括:(a)在含有至少0.2当量的悬浮介质存在下,通过0.9至2.9当量的碱金属氢氧化物I / AGU将纤维素碱化为碱金属氢氧化物水溶液形式的纤维素碱化纤维素 的纤维素的烷基化剂I / AGU; (b)在高于65℃的温度下使步骤(a)的碱化纤维素与烷基化剂I和羟烷基化剂反应; (c)加入碱金属氢氧化物水溶液形式的另外的碱金属氢氧化物11; 和(d)添加额外的烷基化剂11,其量至少为(i)已经加入的纤维素的烷基化剂I / AGU的当量数之间的差异的绝对值,和(ii)总当量数 的碱金属氢氧化物/ AGU的纤维素加入。 如果(i)已经加入的纤维素的烷基化剂I / AGU的当量数超过(ii)已经在纤维素中的碱金属氢氧化物/ AGU的当量的总数,则在步骤(d)中不加入另外的烷基化剂11 添加。 在另外的步骤(e)中,从反应混合物中分离烷基羟烷基纤维素。 分离的烷基羟烷基纤维素可以任选地纯化。