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公开(公告)号：US20220106410A1
公开(公告)日：2022-04-07
申请号：US17484405
申请日：2021-09-24
发明人： Akiko Miki , Taishi Kitaguchi , Akira Kitamura , Mitsuo Narita
摘要： There is provided a method for efficiently produce hydroxypropyl methyl cellulose acetate succinate (HPMCAS) having excellent flowability, where acetic acid in a reaction product mixture subjected to a wash and recovery step can be reduced. More specifically, there is provided a method for producing HPMCAS including an esterification step of esterifying hydroxypropyl methyl cellulose (HPMC) with acetic anhydride and succinic anhydride in acetic acid as a solvent to obtain a reaction product solution containing HPMCAS; a water addition step of adding water to the reaction product solution to obtain a water-added reaction product solution; an acetic acid removal step of removing at least a portion of both the solvent acetic acid and acetic acid derived from the acetic anhydride from the water-added reaction product solution to obtain a mixture having an acetic acid content reduced; and a wash and recovery step of washing the mixture and recovering the HPMCAS.
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公开(公告)号：US10881124B2
公开(公告)日：2021-01-05
申请号：US14965149
申请日：2015-12-10
摘要： Provided is a method for producing an alkyl cellulose having a high viscosity and not having an excessively high gel strength. More specifically, there is provided a method for producing an alkyl cellulose comprising the steps of: mixing a cellulose pulp with a first alkali metal hydroxide solution with stirring to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a first reaction mixture; blending a second alkali metal hydroxide solution with the first reaction mixture with stirring, without further blending of the alkylating agent, to obtain a second reaction mixture; and purifying the second reaction mixture to obtain an alkyl cellulose. There is also provided an alkyl cellulose being produced by the above method and having a degree of substitution of alkyl group of 27 to 33% by weight.
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公开(公告)号：US10723807B2
公开(公告)日：2020-07-28
申请号：US15921146
申请日：2018-03-14
发明人： Akira Kitamura , Mitsuo Narita
IPC分类号： C08B11/02 , D21C9/00 , C08B11/193
摘要： Provided is a method for producing a hydroxyalkyl alkyl cellulose having high thermal gel strength while suppressing a reduction in thermal gelation temperature. More specifically, provided is a method for producing a hydroxyalkyl alkyl cellulose including steps of: mixing cellulose pulp with a first alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an alkylating agent and a hydroxyalkylating agent to obtain a first reaction product mixture, adding a second alkali metal hydroxide solution to the first reaction product mixture without further adding any of alkylating and hydroxyalkylating agents to obtain a second reaction product mixture, and subjecting the second reaction product mixture to purification to obtain a hydroxyalkyl alkyl cellulose.
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公开(公告)号：US10174128B2
公开(公告)日：2019-01-08
申请号：US14079704
申请日：2013-11-14
摘要： Provided is a method for producing low-substituted hydroxypropyl cellulose with less yellowing. More specifically, the method for producing purified low-substituted hydroxypropyl cellulose includes the steps of: reacting alkali cellulose and an etherifying agent to obtain a reaction mixture; dispersing the reaction mixture in water containing a portion of acetic acid necessary for neutralizing the total amount of the reaction mixture to neutralize a portion of the reaction mixture, and then completely neutralizing with the remaining acetic acid to cause precipitation, to obtain a slurry containing crude low-substituted hydroxypropyl cellulose; disintegrating a solid component in the slurry through a cutter pump, the solid component containing the crude low-substituted hydroxypropyl cellulose, and discharging the slurry containing the disintegrated solid component; washing the discharged slurry with water to obtain a cake of purified low-substituted hydroxypropyl cellulose; and drying the cake.
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公开(公告)号：US09926385B2
公开(公告)日：2018-03-27
申请号：US14447846
申请日：2014-07-31
IPC分类号： C08B11/20 , C09D101/28 , C08B1/06 , C08B1/08 , C08B11/00 , C08B15/00 , C09D101/26 , D21C9/00 , D21H15/02 , D21H19/34 , D21H19/52
CPC分类号： C08B11/20 , C08B1/06 , C08B1/08 , C08B11/00 , C08B15/00 , C09D101/26 , C09D101/284 , D21C9/004 , D21C9/007 , D21H15/02 , D21H19/34 , D21H19/52
摘要： Provided are a method for producing a water-soluble cellulose ether having a low degree of polymerization and enhanced whiteness, and the like. The method includes the steps of: bringing a pulp powder having a multiplication product of less than 0.004 mm2 which is obtained by multiplying a number-average fiber length by a number-average fiber width, each measured with a Kajaani fiber length analyzer, into contact with an alkali metal hydroxide to obtain an alkali cellulose; reacting the alkali cellulose with an etherifying agent to obtain a crude water-soluble cellulose ether having a high degree of polymerization; purifying the crude water-soluble cellulose ether; drying the purified water-soluble cellulose ether; grinding the dried water-soluble cellulose ether into a water-soluble cellulose ether powder; and depolymerizing the water-soluble cellulose ether powder to obtain the water-soluble cellulose ether having a low degree of polymerization.
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公开(公告)号：US20160168271A1
公开(公告)日：2016-06-16
申请号：US14965149
申请日：2015-12-10
IPC分类号： C08B11/02
摘要： Provided is a method for producing an alkyl cellulose having a high viscosity and not having an excessively high gel strength. More specifically, there is provided a method for producing an alkyl cellulose comprising the steps of: mixing a cellulose pulp with a first alkali metal hydroxide solution with stirring to obtain alkali cellulose; reacting the alkali cellulose with an alkylating agent to obtain a first reaction mixture; blending a second alkali metal hydroxide solution with the first reaction mixture with stirring, without further blending of the alkylating agent, to obtain a second reaction mixture; and purifying the second reaction mixture to obtain an alkyl cellulose. There is also provided an alkyl cellulose being produced by the above method and having a degree of substitution of alkyl group of 27 to 33% by weight.
摘要翻译： 提供一种具有高粘度且不具有过高凝胶强度的烷基纤维素的制备方法。 更具体地，提供了一种制备烷基纤维素的方法，包括以下步骤：在搅拌下将纤维素纸浆与第一碱金属氢氧化物溶液混合以获得碱纤维素; 使碱纤维素与烷基化剂反应得到第一反应混合物; 在搅拌下将第二碱金属氢氧化物与第一反应混合物混合，而不进一步共混烷基化剂，得到第二反应混合物; 并纯化第二反应混合物以获得烷基纤维素。 还提供了通过上述方法制备并具有27至33重量％的烷基取代度的烷基纤维素。
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37.发明申请公开(公告)号：US20150045550A1
公开(公告)日：2015-02-12
申请号：US14454964
申请日：2014-08-08
IPC分类号： C08B11/20
摘要： Reduction of the energy burden in a step of drying hydrous low-substituted hydroxypropyl cellulose (L-HPC), reduction of water content of a cake obtained by dehydration, and others are targeted. More specifically, provided is a method for dehydrating hydrous L-HPC with a compression type dehydrator by feeding the hydrous L-HPC to a screw conveyer connected to the inlet of the dehydrator, including steps of: starting the operation of the conveyer to fill the conveyer and the dehydrator with the hydrous L-HPC, starting the operation of the filled dehydrator, and feeding the hydrous L-HPC to the conveyer, while discharging dehydrated L-HPC from an outlet of the dehydrator, wherein a feed rate of feeding the hydrous L-HPC to the conveyer is equal to a discharge rate of discharging the dehydrated L-HPC in terms of net weight of cellulose ether, and a method for producing L-HPC by using the above method.
摘要翻译： 干燥含水低取代羟丙基纤维素（L-HPC）的步骤中的能量负荷的降低，脱水得到的滤饼的水分含量的降低等。 更具体地，提供了一种通过将水合L-HPC进料到连接到脱水机的入口的螺旋输送机上的压缩型脱水机来脱水含水L-HPC的方法，包括以下步骤：开始输送机的操作以填充 输送机和脱水器与水合L-HPC开始，开始填充脱水器的操作，并且将水合L-HPC输送到输送机，同时从脱水器的出口排放脱水的L-HPC，其中进料速率 对于输送机的含水L-HPC等于脱水的L-HPC以纤维素醚的净重排出的排出量，以及使用上述方法生产L-HPC的方法。
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