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A large -capacity Lyocell cellulose raw solution and its continuous preparation process

A preparation process and cellulose technology, applied in the field of large-capacity Lyocell cellulose stock solution and its continuous preparation process, can solve problems such as difficulty in capacity expansion and downstream production interruption

Active Publication Date: 2022-06-10
BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problem that the production capacity of the existing Lyocell cellulose stock solution is difficult to enlarge. The present invention provides a large-capacity Lyocell cellulose stock solution and its continuous preparation process. The capacity needs to expand the single-line production capacity, save the factory floor area and equipment investment costs, which has far-reaching significance
At the same time, through homogenization and tempering, the quality of the original solution is improved, and the problem of interruption of downstream production caused by the unqualified quality of the original solution is solved, so that the production can be carried out continuously and stably.

Method used

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  • A large -capacity Lyocell cellulose raw solution and its continuous preparation process
  • A large -capacity Lyocell cellulose raw solution and its continuous preparation process
  • A large -capacity Lyocell cellulose raw solution and its continuous preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] To prepare Lyocell cellulose stock solution:

[0059] S1: The packaged pulp board is sent to the conveying roller of the pulp feeding system with a forklift, and the pulp wrapping paper and the wrapped wire are removed by unpacking, and the metal detection system ensures that no residual metal material enters the downstream equipment. Then the pulp board of 2400kg is determined by weighing and enters the pulper;

[0060] S2: The pulp board enters the pulp pulper to form a pulp water suspension with a concentration of 4.5wt%, and stays in the pulper for 40 minutes to make the pulping sufficient;

[0061] S3: The pulp suspension enters the activation tank, and the pH of the pulp suspension is adjusted with sodium hydroxide solution to be alkaline, and the pH value is 8; the residence time of the pulp suspension in the activation tank is 40min;

[0062] S4: The pulp suspension soaked in alkali solution is transported to the press through a centrifugal pump, and physically...

Embodiment 2

[0069] To prepare Lyocell cellulose stock solution:

[0070] S1: The packaged pulp board is sent to the conveying roller of the pulp feeding system with a forklift, and the pulp wrapping paper and the wrapped wire are removed by unpacking, and the metal detection system ensures that no residual metal material enters the downstream equipment. Then the pulp board of 2400kg is determined by weighing and enters the pulper;

[0071] S2: The pulp board enters the pulp pulper to form a pulp water suspension with a concentration of 4.0 wt%, and stays in the pulper for 35 minutes to make the pulping sufficient;

[0072] S3: The pulp suspension enters the activation tank, and the pH of the pulp suspension is adjusted with sodium hydroxide solution to be alkaline, and the pH value is 10.5; the residence time of the pulp suspension in the activation tank is 50min;

[0073] S4: The pulp suspension soaked in alkali solution is transported to the press through a centrifugal pump, and physic...

Embodiment 3

[0080] To prepare Lyocell cellulose stock solution:

[0081] S1: The packaged pulp board is sent to the conveying roller of the pulp feeding system with a forklift, and the pulp wrapping paper and the wrapped wire are removed by unpacking, and the metal detection system ensures that no residual metal material enters the downstream equipment. Then the pulp board of 3000kg is determined by weighing and enters the pulper;

[0082] S2: the pulp board enters the pulp pulper to form a pulp water suspension with a concentration of 5.0wt%, and stays in the pulper for 35min to make the pulping sufficient;

[0083] S3: The pulp suspension enters the activation tank, and the pH of the pulp suspension is adjusted with sodium hydroxide solution to be alkaline, and the pH value is 11; the residence time of the pulp suspension in the activation tank is 35min;

[0084] S4: The pulp suspension soaked in lye is transported to the press through a centrifugal pump, and physically pressed by the ...

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Abstract

The invention discloses a large-capacity Lyocell cellulose stock solution and its continuous preparation process, comprising the following steps: pulping treatment of a pulp board to obtain a pulp suspension; activation treatment of the pulp suspension to obtain an activated pulp suspension ; The pressing and crushing treatment of activated pulp suspension obtains wet pulp; the homogenization treatment of wet pulp obtains tempered pulp, wherein, the homogenization treatment includes air flow treatment; the tempered pulp is evaporated after mixing with solvent, fully After dissolving, Lyocell cellulose stock solution is obtained; by homogenizing and tempering the wet pulp obtained by pressing, the accessibility of the fiber surface is increased, so that the solvent can better enter the internal structure of the cellulose, the humidity is uniform, and the solvent The stock solution formed after mixing has higher solubility and higher quality. In addition, under the premise of the same reactor area, the production capacity can be significantly expanded, so that the production can be carried out continuously and stably.

Description

technical field [0001] The invention belongs to the technical field of green fiber spinning, in particular to a large-capacity Lyocell cellulose stock solution used for spinning and a continuous preparation process thereof. Background technique [0002] Lyocell fiber is a new type of environmentally friendly material. By dissolving natural cellulose in a recyclable solvent and evaporating excess water in a wiped-film evaporator, Lyocell cellulose stock solution, that is, a spinning solution, is formed. The silk solution is filtered, pressurized, and spun to produce cellulose fibers. The cellulose fibers will be further washed in water, and the solvent will be dissolved in the water, so as to realize the recycling of the solvent, and the solvent can reach a recovery rate of 99%, which does not pollute the environment. The raw material of Lyocell cellulose is obtained from natural plant fibers, and no chemical reaction occurs during the preparation process, which is the key d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D1/02D01D1/06D01F2/00
CPCD01D1/02D01D1/065D01F2/00
Inventor 刘迪张敏喆连斌乔宁宁王杰利
Owner BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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