Modified cellulose fibers and preparation method

Patent metadata

Field	Value
Publication number	US-10501606-B2
Application number	US-201616060437-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 8, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

The invention relates to a method for the preparation of modified cellulose fibers for artificial clarification of active haze substances from liquids. In addition, the invention relates to a modified cellulose fiber obtained by the method according to the invention for artificial clarification of active haze substances from a liquid, and to auxiliary filtering means containing one or more of the modified cellulose fibers.

First claim

The invention claimed is:

1. A method for producing modified cellulose fibers for artificial clarification of turbidity-causing substances from beverages for human consumption, the method comprising the following steps:
preparing a fiber mixture comprising 80-99.9 wt % cellulose fibers, 0.1-10 wt % sodium croscarmellose and 0-10 wt % of one or more additives;
swelling and adjusting the volume and pH of the fiber mixture in a neutral to alkaline medium;
heating the fiber mixture;
washing the cooked fiber mixture to obtain a moist mass of the modified cellulose fibers; and,
isolating the modified cellulose fibers to obtain a resulting finished fibers mixture for treatment for clarification of beverages for human consumption.

2. The method according to claim 1 , wherein the fiber mixture for production of modified cellulose fibers is homogenized.

3. The method according to claim 1 , wherein the cellulose fibers are selected from the group of fibers containing cellulose, cellulose containing fibers, fibers from grains, from wood, from bamboo, from wood chips, from wood wastes and mixtures of same, and wherein the fibers have an average fiber length in the range of <1 to 500 μm.

4. The method according to claim 1 , wherein the fiber mixture according to step (a) comprises 92-99 wt % cellulose fibers, 1-8 wt % sodium croscarmellose and 0-4 wt % of one or more additives.

5. The method according to claim 1 , wherein the fiber mixture according to step (a) is selected from a composition consisting of 90-99.9 wt % cellulose fibers, 0.1-5 wt % sodium croscarmellose and 0-5 wt % of one or more additives or from 90-99 wt % cellulose fibers and 1-5 wt % sodium croscarmellose and 0-5 wt % of one or more additives.

6. The method according to claim 1 , wherein one or more additives are selected from the group of additives consisting of pectin, carrageenan, isinglass, hydrocolloids, starch, gallotannins, silica sol, silica gel, polyvinylpyrrolidone and polyvinylpolypyrrolidone as well as mixtures of same.

7. The method according to claim 1 , wherein for workup of the fiber mixture, the pH is adjusted with at least one acid and/or with at least one base to a value between pH 6 and pH 13.

8. The method according to claim 1 , further comprising after washing, drying the moist mass to a residual water content of 2-10 wt % to obtain a dry mass.

9. A method for producing modified cellulose fibers for artificial clarification of turbidity-causing substances from liquids, the method comprising the following steps:
preparing a fiber mixture comprising 80-99.9 wt % cellulose fibers, 0.1-10 wt % sodium croscarmellose and 0-10 wt % of one or more additives;
swelling and adjusting the volume and pH of the fiber mixture in a neutral to alkaline medium;
heating the fiber mixture;
washing the cooked fiber mixture to obtain a moist mass of the modified cellulose fibers; and,
isolating the modified cellulose fibers to obtain a resulting finished fibers mixture,

wherein the finished fiber mixture is processed in an additional method step using the moist mass to form filter aids and/or filter sheets.

10. The method according to claim 9 wherein the additional method step comprises at least one process selected from layering, tamping, absorbing, pressing, and pouring the moist mass of the modified cellulose fibers into filter units.

11. The method according to claim 10 comprising preparing a filter aid by inserting at least one of the filter units into at least one of: deadend tube filters, deadend sheet filters, deadend disk filters, deadend leaf filters and layered sheet filters.

12. The method according to claim 9 further comprising after washing, drying the moist mass to a residual water content of 2-10 wt % to obtain a dry mass, wherein the dry mass finished fibers mixture is processed using at least one selected from layering, tamping, absorbing, and pressing the dry mass modified cellulose fibers into dry mass filter units.

13. The method according to claim 12 further comprising preparing dry mass filter aids by inserting at least one of the dry mass filter units into at least one off; deadend tube filters, deadend sheet filters, deadend disk filters, deadend leaf filters and layered sheet filters.

Assignees

• Univ Berlin Tech

Inventors

• Kunz Thomas
• Brandt Niklas Ole
• Methner Frank-Jürgen

Classifications

• B01D2239/10

  Filtering material manufacturing · CPC title

• C08L1/02 Primary

  Cellulose; Modified cellulose · CPC title

• B01D39/18 Primary

  the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14) · CPC title

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08L3/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title