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Viscose sodium sulfate waste liquid regeneration recycling process

A technology of sodium sulfate waste liquid and viscose fiber, which is applied in the fields of fiber chemical characteristics, sustainable manufacturing/processing, textile/flexible product manufacturing, etc. problem, to achieve the effect of reducing consumption

Inactive Publication Date: 2021-04-30
YIBIN GRACE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN109970274A is a method for treating acidic wastewater and alkaline wastewater in the viscose fiber industry. This technology consumes a lot of energy and resources in the process of acid and alkali concentration, and the concentration of dilute brine is high, and contains part of sulfuric acid. Biochemical treatment + reverse osmosis treatment is difficult Larger, high occupation rate of human resources in each process, and high cultural requirements for employees operating high-temperature and high-pressure vessels such as evaporation and reverse osmosis

Method used

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  • Viscose sodium sulfate waste liquid regeneration recycling process
  • Viscose sodium sulfate waste liquid regeneration recycling process
  • Viscose sodium sulfate waste liquid regeneration recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Such as figure 1 Shown, a kind of viscose fiber sodium sulphate waste liquor recycling process comprises the steps:

[0078] Step 1: Preparation of solid sodium sulfate

[0079] Spinning acid bath produces acid bath acid, which includes sulfuric acid and sodium sulfate, which is filtered and degassed, and then enters the multi-effect evaporation concentration system for evaporation and concentration, crystallization and centrifugation to obtain solid sodium sulfate, multi-effect evaporation and centrifugation. Sulfuric acid is used in the spinning acid bath process;

[0080] Step 2: Sodium sulfate brine preparation and impurity removal

[0081] Add demineralized water and solid sodium sulfate into the preparation container at the same time and stir to prepare a sodium sulfate solution with a concentration of 15-30%, and pass it into the pretreatment system, and remove it from the sodium sulfate solution after filtration by the pretreatment system and resin adsorption....

Embodiment 2

[0096] The difference between this embodiment and Example 1 is that resin recovery treatment is required after the resin for removing impurities of sodium sulfate is adsorbed and saturated, and the recovery treatment steps of the resin include: replacing the saturated resin with brine, high-pressure air Rinsing, pickling, water washing and alkali washing, the acid used in the pickling includes the sulfuric acid solution obtained after the bipolar membrane treatment system, and the alkali used in the alkali washing includes the lye obtained after the bipolar membrane treatment system.

[0097] The resin recovery process of the present invention adopts brine replacement flushing, high-pressure air flushing, and pickling to process the saturated resin. First, the brine replacement flushing can dilute the concentration of sodium sulfate solution in the resin tower, preventing sodium sulfate crystals from adhering to the resin surface. , affect cleaning, and at the same time remove ...

Embodiment 3

[0105] The lye that is filtered out after the lye is processed by the nanofiltration membrane is used in the immersion of the glue making process, which is called the lye dipping, and also needs to be treated with impurity removal. The liquid is filtered, and a layer of cellulose layer is pre-coated on the filter element of the VCF filter. The cellulose layer adopts plant cellulose with a size of 40-60 μm, and the thickness of the cellulose layer is 10 μm.

[0106] The cleaning method of dipping lye of the present invention can greatly improve the filtration precision by pre-coating a layer of cellulose layer on the filter core of the VCF filter, and can effectively filter large particles in the lye, and at the same time, the filter residue is easy to disassemble and rinse without manual labor. Operation, reduce labor intensity, improve efficiency, less washing water consumption, filter residue is dry cake, which can reduce the discharge of waste lye, which is economical and en...

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Abstract

The invention discloses a viscose sodium sulfate waste liquid regeneration recycling process, and solves the technical problem that sodium sulfate waste liquid generated in the existing viscose production process is not combined with specific viscose production and needs to be reasonably recycled. The process comprises the following steps that sodium sulfate is treated through a bipolar membrane treatment system to obtain alkali liquor, a sulfuric acid solution and acid-containing dilute brine; the alkali liquor is utilized, specifically, part of the alkali liquor is treated through a nanofiltration membrane to obtain filtered alkali liquor and concentrated alkali liquor, and the filtered alkali liquor is used for primary impregnation, secondary impregnation and yellowing procedures; the concentrated alkali liquor is used for bipolar membrane pretreatment; part of the alkali liquor is used as a raw material for filament pressure washing, and part of the alkali liquor is used as a resin regeneration agent in the bipolar membrane pretreatment process; the acid liquor is utilized, specifically, part of the acid liquor is used as a raw material for filament pressure washing, and part of the acid liquor is used as a resin regeneration agent in the bipolar membrane pretreatment process; and the acid-containing dilute brine enters a multi-effect evaporation process. According to the process, the closed-loop utilization of the sodium sulfate waste liquid is realized.

Description

technical field [0001] The invention relates to the technical field of viscose fiber production, in particular to a regeneration and recycling process of viscose fiber sodium sulfate waste liquid. Background technique [0002] A large amount of acid and alkali will be consumed in the acid bath process of viscose fiber production, and a large amount of surplus sodium sulfate will be produced in the acid-base reaction. With the rapid development of the global industrialization process, the environmental protection treatment of sodium sulfate in the viscose fiber production process has become a difficult problem in the industry; the traditional way to deal with sodium sulfate in the industry is to dry and roast sodium sulfate, which is labor-intensive and requires a lot of equipment , and the market saturation of Yuanming powder is high, resulting in a large amount of waste; the bipolar membrane electrodialysis system, by virtue of its characteristics of dissociation of water a...

Claims

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Application Information

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IPC IPC(8): D01F13/02B01D61/44
CPCD01F13/02B01D61/445Y02P70/62
Inventor 贺敏田启兵陈勇君夏长林胡小东王云廖磊
Owner YIBIN GRACE
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