High-capacity Lyocell cellulose stock solution and continuous preparation process thereof

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

Active Publication Date: 2021-09-14
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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  • High-capacity Lyocell cellulose stock solution and continuous preparation process thereof
  • High-capacity Lyocell cellulose stock solution and continuous preparation process thereof
  • High-capacity Lyocell cellulose stock solution and continuous preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Preparation of Lyocell cellulose stock solution:

[0059] S1: Packed pulp boards are sent to the conveying rollers of the pulp feeding system by a forklift, and the wrapping paper and wrapped wire of the pulp are removed by unpacking, and the metal detection system is used to ensure that no residual metal substances enter the downstream equipment. Then, the pulp board determined to be 2400kg by weighing enters the pulper;

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

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

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

Embodiment 2

[0069] Preparation of Lyocell cellulose stock solution:

[0070] S1: Packed pulp boards are sent to the conveying rollers of the pulp feeding system by a forklift, and the wrapping paper and wrapped wire of the pulp are removed by unpacking, and the metal detection system is used to ensure that no residual metal substances enter the downstream equipment. Then, the pulp board determined to be 2400kg by weighing enters the pulper;

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

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

[0073] S4: The pulp suspension soaked in lye is transported to the press through a centrifugal pump, and is physically pres...

Embodiment 3

[0080] Preparation of Lyocell cellulose stock solution:

[0081] S1: Packed pulp boards are sent to the conveying rollers of the pulp feeding system by a forklift, and the wrapping paper and wrapped wire of the pulp are removed by unpacking, and the metal detection system is used to ensure that no residual metal substances enter the downstream equipment. Then the pulp board determined to be 3000kg by weighing enters the pulper;

[0082] S2: The pulp board enters the pulp pulper to form a pulp aqueous suspension with a concentration of 5.0 wt%, and stays in the pulper for 35 minutes to fully pulp;

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

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

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Abstract

The invention discloses a high-capacity Lyocell cellulose stock solution and a continuous preparation process thereof. The continuous preparation process comprises the following steps of carrying out repulping treatment on a pulp plate to obtain a pulp suspension; activating the pulp suspension to obtain an activated pulp suspension; squeezing and crushing the activated pulp suspension to obtain wet pulp; performing homogenization treatment on the wet pulp to obtain tempered pulp, wherein homogenization treatment comprises airflow treatment; and mixing the tempered pulp with a solvent, performing evaporating, and performing full dissolving to obtain the Lyocell cellulose stock solution. The wet pulp obtained by squeezing is homogenized and tempered, so that the accessibility of the fiber surface is increased, a solvent can better enter the internal structure of cellulose, the humidity is uniform, and the stock solution formed after the pulp is mixed with the solvent is higher in solubility and higher in quality. In addition, on the premise of the same reactor area, the production capacity is obviously increased, so that the production is continuously and stably carried out.

Description

technical field [0001] The invention belongs to the technical field of green fiber spinning, and in particular relates to a large-capacity Lyocell cellulose stock solution used in 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, spinning solution, is formed. The silk solution is prepared into cellulose fibers after filtration, pressurization, and spinning. The cellulose fibers will be further washed in water, and the solvent will be dissolved in water, so as to realize the recycling of the solvent. The recovery rate of the solvent can reach 99%, and there is no pollution to the environment. The raw material of Lyocell cellulose is taken from natural plant fibers, and no chemical reaction occurs during the preparation pro...

Claims

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Application Information

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Patent Type & Authority Applications(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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