Unlock instant, AI-driven research and patent intelligence for your innovation.

Manufacturing of microcellulose

A technology of microcrystalline cellulose and cellulose, which is applied in cellulose pulp post-processing, fiber raw material processing, papermaking, etc., and can solve the problems of high cost, high maintenance cost, high mechanical energy input, etc.

Inactive Publication Date: 2013-02-27
KEMIRA OY
View PDF10 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of extruders are that they are expensive, fairly high maintenance, and they require a high mechanical energy input, estimated by estimates of at least 100kWh per tonne of dry cellulose, typically at least 150kWh (excluding heating energy input)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Manufacturing of microcellulose
  • Manufacturing of microcellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The above experimental procedure was applied to fully bleached pulp. The concentration in the hydrolysis stage is 15%, the cooking temperature is 165°C, and the cooking time is 180 minutes. exist figure 1 The particle size distribution of the obtained microcrystalline cellulose is shown in .

[0064] The results of this experiment show that hydrolysis at 165° C. for 180 minutes without adding acid yields good quality uniform microcrystalline cellulose with an average particle size of about 20 μm without any mechanical treatment.

Embodiment 2

[0066] The above experimental procedure was applied to fully bleached pulp. The concentration in the hydrolysis stage is 15%, the cooking temperature is 150°C, and the cooking time is 120 minutes. exist figure 2 The particle size distribution of the obtained microcrystalline cellulose is shown in .

[0067] The results of this experiment show that hydrolysis at 150° C. for 120 minutes without addition of acid yields rather good quality homogeneous microcrystalline cellulose with an average particle size of about 50 μm without any mechanical treatment. Compared to Example 1, the particle size is slightly larger.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a process for producing microcellulose comprising a) acidifying fibrous cellulosic material, b) washing the acidified cellulosic material, c) optionally dewatering the washed cellulosic material, and d) hydrolyzing the washed or washed and dewatered cellulosic material under acidic conditions at a temperature of at least 120 DEG C and at a consistency of at least 8% on dry weight of the cellulose.

Description

Field of Invention [0001] The present invention relates to a method for preparing microcrystalline cellulose from fibrous cellulosic material, the method comprising an acidification step and a hydrolysis step. Background of the Invention [0002] Microcrystalline cellulose (also referred to as eg cellulose with an equilibrium degree of polymerization (Level-off DP) and microcrystalline cellulose) is used in many industrial applications such as in food, pharmaceuticals, cosmetics, paper and board and many others is a generic product. Microcrystalline cellulose can also be used to produce microcrystalline cellulose derivatives such as viscose cellulose, CMC, nanocellulose and various composite products. [0003] Several methods for producing microcrystalline cellulose have been proposed in the patent literature. [0004] US 2978446 describes the production of cellulose to an equilibrium degree of polymerization (DP) by acid hydrolysis and mechanical treatment. Cellulose was...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02C08H8/00
CPCC08B15/02C08H8/00C08B15/00D21C9/00
Inventor E·I·S·拉萨宁L·罗伯特松V-M·沃伦帕洛A·卡比K·帕维艾宁O·达尔K·万哈塔洛
Owner KEMIRA OY