公开(公告)号：US5473061A

公开(公告)日：1995-12-05

申请号：US298399

申请日：1994-08-30

申请人： Karl Bredereck ,  Ties Karstens ,  Harro Lentz ,  Hans Steinmeier

发明人： Karl Bredereck ,  Ties Karstens ,  Harro Lentz ,  Hans Steinmeier

IPC分类号： C08B1/00 ,  C08B1/02 ,  C08B3/00

CPC分类号： C08B1/02 ,  C08B1/00

摘要： The process for the treatment of cellulose for activation for subsequent chemical reactions by bringing the cellulose in contact with liquid ammonia at a pressure higher than atmospheric pressure in a pressure vessel and subsequent expansion by rapid reduction of the pressure to atmospheric pressure, is carried out by using a cellulose pulp of an alpha-cellulose content of at least 92 mass %, letting the ammonia act on the pulp at room temperature or at a temperature higher than room temperature, after the expansion, removing the ammonia then still remaining in the pressure vessel except for a minimum content at which the state of activation reached by the action of the ammonia is still maintained and finally replacing the residual ammonia still needed to maintain the state of activation by another swelling or inclusion agent. The process is suitable, also on a large industrial scale, especially for the activation of pulp subsequently to be acetylated and makes possible to achieve a homogenous and high-grade activation. Further, no costly cooling apparatus is needed.

摘要翻译： 通过在压力容器中使纤维素与压力高于大气压的液氨接触并随后通过将压力快速降低至大气压力进行膨胀来处理纤维素用于随后的化学反应的处理过程由 使用α-纤维素含量为至少92质量％的纤维素纸浆，使氨在室温或高于室温的温度下在纸浆上起作用，在膨胀之后，除去氨然后仍然保留在压力容器中 除了通过氨的作用达到的活化状态仍然保持的最小含量，并且最终替换仍然需要的残余氨以维持另一溶胀或包合剂的活化状态。 该方法也适用于大型工业规模，特别是用于随后乙酰化的纸浆的活化，并且可以实现均匀和高等级的活化。 此外，不需要昂贵的冷却装置。

公开(公告)号：US20050119476A1

公开(公告)日：2005-06-02

申请号：US10499881

申请日：2002-12-12

申请人： Hans Steinmeier

发明人： Hans Steinmeier

IPC分类号： C08B1/00 ,  C08B1/02 ,  C08B3/00 ,  C08B3/06 ,  D01F2/28

CPC分类号： C08B1/00 ,  C08B1/02 ,  C08B3/00 ,  C08B3/06

摘要： The invention relates to a method for improving the colour index of cellulose esters especially consisting of cellulose acetate. According to the inventive method, a delignified eucalyptus pulp is subjected to a preliminary treatment in order to remove pigments or chromophoric substances, and the process-modified eucalyptus pulp obtained is converted into cellulose esters in a conventional manner. The inventive method is characterized in that a delignified eucalyptus pulp having a cellulose content of more than approximately 80 wt. % and a pentosan content of more than approximately 1 wt. % is extracted by means of a solvent which dissolves oligomer pentosans but not the pulp of the delignified eucalyptus pulp, especially at a temperature of up to approximately 200 ° C. and a pressure of up to approximately 30 bar. The inventive method leads to an improvement in the colour index of cellulose esters or the fibres and filaments produced therefrom, in an economical and technically simple manner.

摘要翻译： 本发明涉及一种改善纤维素酯颜料指数的方法，特别是乙酸纤维素组成。 根据本发明的方法，对脱木桉树纸浆进行初步处理以除去颜料或发色物质，将所得的加工改性的桉树纸浆以常规方式转化为纤维素酯。 本发明的方法的特征在于，具有大于约80重量％的纤维素含量的脱木质桉树纸浆。 ％，戊聚糖含量大于约1wt。 通过溶解低聚物戊聚糖而不是脱木质桉树纸浆的溶剂提取％，特别是在高达约200℃的温度和高达约30巴的压力下。 本发明的方法以经济和技术上简单的方式导致纤维素酯或由其生产的纤维和长丝的颜色指数得到改善。

公开(公告)号：US06392035B1

公开(公告)日：2002-05-21

申请号：US09403713

申请日：1999-11-10

申请人： Ties Karstens ,  Armin Stein ,  Hans Steinmeier

发明人： Ties Karstens ,  Armin Stein ,  Hans Steinmeier

IPC分类号： C08B1100

CPC分类号： C08B3/00 ,  C08B11/00

摘要： The invention concerns reactive cellulose, i.e. cellulose having in particular a very low degree of crystallinity obtainable with a high degree of purity. Said novel reactive cellulose is particularly used as raw material for making cellulose ethers. The invention is characterized in that the reactive cellulose is substituted by organic groups according to a degree of substitution, DS, of less than 0.2, preferably between 0.04 and 0.2.

摘要翻译： 本发明涉及反应性纤维素，即具有非常低的结晶度的纤维素，其可以以高纯度获得。 所述新型反应性纤维素特别用作制备纤维素醚的原料。 本发明的特征在于反应性纤维素根据取代度DS（小于0.2，优选0.04-0.2）被有机基团取代。

公开(公告)号：US5939544A

公开(公告)日：1999-08-17

申请号：US913782

申请日：1997-11-06

申请人： Ties Karstens ,  Hans Steinmeier

发明人： Ties Karstens ,  Hans Steinmeier

IPC分类号： C08B1/00 ,  C08B1/06 ,  C08B30/00 ,  C08B30/12 ,  C08B37/00 ,  C08B37/08 ,  D01F2/02 ,  D01F2/24 ,  C08B1/02

CPC分类号： D01F2/02 ,  C08B1/00 ,  C08B1/06 ,  C08B30/12 ,  C08B37/003 ,  C08B37/0096 ,  D01F2/24

摘要： The process for activating polysaccharides consists of contacting the polysaccharide with liquid ammonia at an initial pressure which is higher than atmospheric pressure and at a temperature of at least approximately 25.degree. C., the amount of liquid ammonia being sufficient at least for wetting the surface of the polysaccharide starting material which is then expanded. The volume available for the polysaccharide/liquid ammonia system is enlarged in the manner of an explosion by lowering the pressure by at least 5 bar. The process is particularly suitable for activating cellulose, guar gum, starch and chitin. The process enables cellulose to be modified in a novel manner. The activated polysaccharides display higher reactivity and improved elimination of reagents during acylation, alkylation, silylation, xanthogenation and carbomoylation with largely homogeneous reaction processes.

摘要翻译： PCT No.PCT / EP96 / 01274 Sec。 371日期：1997年11月6日 102（e）日期1997年11月6日PCT 1996年3月22日PCT公布。 公开号WO96 / 30411 PCT 日期1996年10月3日活化多糖的方法是将多糖与液态氨接触，初始压力高于大气压，并在至少约25℃的温度下，液氨的量至少足够 用于润湿然后膨胀的多糖起始材料的表面。 通过将压力降低至少5巴，可用于多糖/液氨系统的体积以爆炸的方式扩大。 该方法特别适用于活化纤维素，瓜尔胶，淀粉和壳多糖。 该方法使纤维素以新颖的方式被修饰。 活化的多糖在酰化，烷基化，甲硅烷基化，黄原酸化和羰基甲酰化反应过程中显示更高的反应性和更好的消除反应。