Method for preparing α-cellulose, spinning composition, and fiber material

Patent metadata

Field	Value
Publication number	US-10968567-B2
Application number	US-201816233684-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Dec 27, 2018
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A method for preparing α-cellulose, a spinning composition, and a fiber material are provided. The method for preparing α-cellulose includes providing a coffee residue; subjecting the coffee residue to a decolorization treatment, obtaining a white powder; reacting the white powder with an alkaline solution, obtaining a mixture; filtering the mixture to produce a filter cake; and baking the filter cake to obtain α-cellulose.

First claim

What is claimed is:

1. A method for preparing α-cellulose, comprising:
providing a coffee residue;
subjecting the coffee residue to a decolorization treatment, obtaining a white powder;
reacting the white powder with an alkaline solution after the decolorization treatment, obtaining a mixture, wherein the alkaline solution comprises sodium hydroxide and water, wherein the weight ratio of sodium hydroxide to water is from 18:100 to 25:100, and wherein the weight ratio of the white powder to sodium hydroxide is from 1:1 to 1:2; and
filtering the mixture to produce a filter cake and then baking the filter cake to obtain α-cellulose.

2. The method as claimed in claim 1 , wherein the white powder is reacted with the alkaline solution for a period of 30-240 min.

3. The method as claimed in claim 1 , wherein the decolorization treatment comprises following steps:
mixing 100 parts by weight of coffee residue, 300-1500 parts by weight of water, and 5-30 parts by weight of sodium hydroxide, obtaining a first solution;
adding 10-150 parts by weight of hydrogen peroxide into the first solution to undergo a reaction, obtaining a second solution; and
filtering the second solution to produce a filter cake and then baking the filter cake to obtain the white powder.

4. The method as claimed in claim 3 , wherein the first solution is reacted with the hydrogen peroxide for a period of 100-360 min.

5. The method as claimed in claim 1 , after filtering the mixture to produce the filter cake, further comprising: washing the filter cake with 50° C.-80° C. hot water in order to remove residual sodium hydroxide.

Assignees

• Ind Tech Res Inst

Inventors

• Hwang Shi-Kuang
• Lu Tien-Ching
• Hsiao Kai-Jen
• Tang Jing-Wen

Classifications

• Y02W30/64

  Paper recycling · CPC title

• D01F2/00 Primary

  Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof · CPC title

• D21C5/00 Primary

  Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C); {Processes characterised by the choice of cellulose-containing starting materials} · CPC title

• D21C5/02

  Working-up waste paper (mechanical part D21B1/08, D21B1/32) · CPC title

• D21C3/02

  with inorganic bases or alkaline reacting compounds, e.g. sulfate processes · CPC title