A kind of recovery method of solution for producing lyocell fiber

A recycling method and fiber technology, which is applied in the field of fiber production, can solve problems such as inability to remove solid or colloidal impurities and affect the normal operation of the recycling process, and achieve the effect of improving quality, appearance and physical indicators

Active Publication Date: 2017-06-06
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The application provides a recovery method for the solution used in the production of Lyocell fibers, which solves or partially solves the filtration or flotation methods used in the prior art, which cannot well remove the ions, colored substances, solids or colloids contained therein. The removal of impurities affects the normal operation of the subsequent recovery process, and even the technical problems of the quality of the final solvent

Method used

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  • A kind of recovery method of solution for producing lyocell fiber
  • A kind of recovery method of solution for producing lyocell fiber
  • A kind of recovery method of solution for producing lyocell fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0080] The solvent to be recovered for the production of Lyocell fibers used in this implementation has a light yellow color and test indicators: electrical conductivity of 150 μS / cm (micro Siemens per centimeter), turbidity of 80 FTU, and total iron content of 2.5 ppm.

[0081] Such as figure 2 As shown, first, take 100kg of fly ash crushed to 80 meshes, add 1900kg of 2.5% NaOH aqueous solution to prepare a 5% fly ash mixed solution, heat up to 80°C, stir for 3 hours under heat preservation, and then transport to the alkalinity supply tank for use.

[0082] The solvent to be recovered is transported into the adsorption agitator at a flow rate of 1 ton / hour, and alkalized substances are added at a flow rate of 6 kg / hour, the concentration of fly ash in the solvent to be recovered is 300 ppm, and the average residence time of mixing and stirring is 18 minutes , and then transported to the Doyle-type settling tank, the clarified solution flows out from the upper layer of the s...

Embodiment 2

[0087] The solvent to be recovered for the production of Lyocell fibers used in this implementation is light yellow in color. The test indicators: conductivity 210μS / cm, turbidity 110FTU, and total iron content 3.0ppm.

[0088] Such as image 3 As shown, first, take 1000 kg of kaolin crushed to 300 mesh, add 3000 kg of 15% NaOH aqueous solution to prepare a 25% kaolin mixed solution, raise the temperature to 102 ° C, stir for 1.5 hours under heat preservation, and then transport it to the alkalization supply Cans are ready to use.

[0089] The solvent to be recovered is transported into the adsorption mixer at a flow rate of 80 tons / hour, an alkalized compound is added at a flow rate of 256 kg / hour, the concentration of kaolin in the solvent to be recovered is 800ppm, the average residence time of mixing and stirring is 5 minutes, and then transported To the flocculation mixer, add anionic polyacrylamide accounting for 160ppm of the solvent to be recovered, mix for 0.5 minute...

Embodiment 3

[0094] The solvent to be recovered for the production of Lyocell fibers used in this implementation is light yellow in color. The test indicators: conductivity 180μS / cm, turbidity 90FTU, and total iron content 3.5ppm.

[0095] Such as Figure 4 As shown, first, take 500 kg of diatomite crushed to 150 meshes, add 4500 kg of 8% NaOH aqueous solution to prepare a 10% diatomite mixed solution, heat up to 90 ° C, stir for 3.5 hours under heat preservation, and then Transport to alkalization supply tank for use.

[0096] The solvent to be recovered is transported into the adsorption mixer at a flow rate of 5000kg / hour, an alkalized compound is added at a flow rate of 20kg / hour, the concentration of diatomaceous earth in the solvent to be recovered is 400ppm, the average residence time of mixing and stirring is 4 minutes, and then Transport to the flocculation mixer, add anionic polyacrylamide accounting for 20ppm of the solvent to be recovered, mix for 0.5 minutes, then pressurize ...

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Abstract

The invention discloses a method for recovering a solution for producing a Lyocell fiber. The method comprises the following steps: crushing substances containing silicon and aluminum, and alkalifying to obtain an alkalified liquid; mixing the alkalified liquid with a to-be-recovered solution and a to-be-recovered solvent to obtain a mixed solution; adsorbing impurities in the to-be-recovered solvent of the to-be-recovered solution by the alkalified liquid, wherein the alkalified liquid exists in a form of an insoluble substance; and clarifying and separating the adsorbed mixed solution to obtain filtrate and slurry containing the insoluble substance. The substances containing silicon and aluminum are crushed and alkalified; solid powder containing silicon-aluminum macromolecular inorganic polymers and having micropore adsorption performance is obtained; the solid powder has processing capacity on ions, colorized substances, and solid or colloidal impurities contained in the recovered solvent; the solid impurities are separated from the solvent through the clarifying process; the appearance and the physical indexes of the processed recovered solvent are improved; and the quality of the recovered solvent is improved.

Description

technical field [0001] The invention relates to the technical field of fiber production, in particular to a method for recovering a solution for producing Lyocell fibers. Background technique [0002] According to the definition of the International Rayon and Synthetic Fiber Standards Bureau, using natural cellulose as raw material, the cellulose fiber prepared by NMMO (solvent N-methylmorpholine-N-oxide) solvent spinning process is named Lyocell (soluble )fiber. Lyocell fiber uses NMMO solvent to dissolve cellulose, and precipitates it in the aqueous spinning coagulation bath, and washes it with water to remove the NMMO solvent entrained on the tow, and the washing solution is sent to the coagulation bath. [0003] In order to ensure the economy of the production process, this part of the aqueous solution containing NMMO solvent usually needs to be recovered and reused. The solvent to be recovered usually contains the following impurity components: [0004] 1. Soluble an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/281C02F1/5236C02F1/56C02F9/00C02F2301/00
Inventor 蔡剑程鹏荀红利李婷田玲安康
Owner CHINESE TEXTILE ACAD
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