Method for the preparation of cellulose ethers with high solids process, product obtained and uses of the product

A cellulose and solid technology, applied in the field of cellulose ether, can solve the problems of huge investment and maintenance costs, complex and expensive equipment, etc.

Active Publication Date: 2015-01-14
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] Obviously, the traditional CMC production route requires complex and expensive equipment as well as huge investment and maintenance costs
Therefore, the question is how to simplify this process to reduce cost and improve safety, and the environmental impact is of high value

Method used

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  • Method for the preparation of cellulose ethers with high solids process, product obtained and uses of the product
  • Method for the preparation of cellulose ethers with high solids process, product obtained and uses of the product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] One hundred grams (calculated on dry matter) of undried pinewood pulp directly from the pulp mill was dewatered to give a solids content of 19.5% and a water content of 80.5%. A powder such as NaOH (29.6 g) was added to the pulp and the mixture was mixed mechanically with Kitchen aid for 30 minutes. The basified cellulose was allowed to stand overnight at 2°C. Mechanical mixing was continued and 33.4 ml of an 80w% monochloroacetic acid solution were added within 10 minutes with stirring. Mixing was continued for an additional 30 minutes, after which the material was placed in a sealed reactor in an oven at 105°C for 120 minutes. Allow the reactor to cool. The carboxymethylated cellulose fibers were suspended in 2 liters of water and the pH was adjusted to 7 with 35w% HCl. The material was filtered on a Bühner funnel and further washed three times with 3 liters of cold water. The wet material was further used to prepare MFC using Microfluidizer (Microfluidics Inc.). ...

Embodiment 6

[0080] Example 6 was prepared similarly to Example 1, however, during mixing with a dough mixer, 59.2 g of a 50w% NaOH solution were added dropwise to the mercerizing step rather than as a solid NaOH. After adding the NaOH solution, the experiment was continued analogously to Example 1.

Embodiment 7

[0081] Example 7 was prepared similarly to Example 1, but MCA was introduced dropwise into the mixture as a 50w% solution in 2-propanol instead of MCA as an 80w% aqueous solution. The amounts of chemicals are in Table 1. After adding the etherifying agent, the synthesis was continued analogously to Example 1.

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PUM

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Abstract

The present invention provides a method for production of cellulose ethers in a high solids process substantially without use of organic solvents as reaction and / or washing medium. In the method of the invention the first alkalization step is carried out by using high solids content cellulose pulp and solid sodium hydroxide. This is followed by an etherification step where the solids content is preferably further increased and the use of solid etherification reactant is preferred. As no organic solvents are used as reaction media the invented method enables production of cellulose ethers directly from never dried pulp with significant savings in energy and investment costs. The method is especially suitable for the production of carboxymethyl cellulose sodium salt (CMC) with low degree of substitution (DS < 0.3). The use of the resulting none or low water soluble carboxymethylated cellulosic fibres is suitable for example for producing microfibrillated cellulose.

Description

technical field [0001] The present invention relates to a process enabling the production of alkali cellulose as an intermediate in a water-based (without organic solvent) process and further etherification of said cellulosic material to produce cellulose derivatives, in particular cellulose ethers. Cellulose ethers which may be prepared from said alkali cellulose include but are not limited to / in particular: carboxymethyl cellulose (CMC), carboxyethyl cellulose (CEC), methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC). [0002] Said etherified cellulosic materials, such as carboxymethylcellulose and especially the corresponding sodium salt (hereinafter referred to as CMC), can further be used in microfibrillated or nanofibrillated cellulosic materials (respectively referred to as MFC) or NFC) and other applications where the use of CMC is advantageous to achieve certain product propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B1/08C08B11/12
CPCC08B11/12C08B1/08
Inventor H.萨克塞尔I.海斯卡南L.阿克斯鲁普C.兰德亨斯达尔V.约凯拉
Owner STORA ENSO OYJ
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