CN103498312B - A kind of denim mercerising alkali and bleeding agent reclaim and the technique of decolouring and system - Google Patents
A kind of denim mercerising alkali and bleeding agent reclaim and the technique of decolouring and system Download PDFInfo
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- CN103498312B CN103498312B CN201310471680.0A CN201310471680A CN103498312B CN 103498312 B CN103498312 B CN 103498312B CN 201310471680 A CN201310471680 A CN 201310471680A CN 103498312 B CN103498312 B CN 103498312B
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Abstract
The invention discloses technique and the system of a kind of denim mercerising alkali and bleeding agent recovery and decolouring.This technique comprises puts into stillpot by denim mercerising alkali lye, after precipitation, upper liquid enters conveyance conduit by flow pump, simultaneously, decolorizer is pumped in conveyance conduit liquid by measuring pump, deliver to together in evaporation concentrator, after evaporation and concentration, enter stillpot, the supernatant after precipitation directly delivers to production line, bottom precipitated liquid is after centrifuge process, solid is separated to useless solid storage tank, and clear liquid turns back to stillpot, then sends production line back to; This system comprises the first stillpot, flow pump, measuring pump, decolorizer case, evaporation concentrator and the second stillpot, described first stillpot, flow pump, evaporation concentrator are directly connected by pipeline with the second stillpot, below the pipeline that flow pump is connected with evaporation concentrator, connect decolorizer case by measuring pump.Present invention process is simple, and has reclaimed useful alkali and bleeding agent, greatly reduces production cost.
Description
Technical field
The present invention relates to the decolouring of a kind of alkali lye and the common recovery process of bleeding agent and method, especially a kind of reclaim for alkali lye and bleeding agent after the denim mercerising in dyeing industry and carry out the technique of decolouring and
system, belong to resource recycling and energy-conserving and emission-cutting technology field.
Background technology
The mercerising of COTTON FABRIC comes from 1844, is found by Englishize scholar wheat plucked instrument.Until 19 end of the centurys just formally applied to printing and dyeing industry, become a significant process of cotton textiles dyeing and finishing processing.It all plays a part very important to the inherent quality and presentation quality that improve COTTON FABRIC product.So-called mercerising refers to that cotton textiles are under the state of bearing some tension, and by the effect of concentrated caustic, the size required for maintenance, obtains soyeux gloss, and this process is called as mercerising.
At present due to the change in market, the quality requirement of consumer to commodity is more and more higher.When denim finish, often also adopt mercerization to improve denim quality, denim mercerising makes cloth cover gloss, and capillary effect, feel all have very large change.Therefore, the denim market after mercerising is very large, and at present, China just has more than 400 denim mercerising production line; But cowboy's mercerized finish needs to consume a large amount of caustic soda (NaOH), if the weak lye after these mercerisings is not recycled, not only wastes resource, also can serious environment pollution.But, when denim mercerized finish, due to:
1, denim mercerising processing technology namely carries out mercerising after singing, and in mercerising process, in order to reduce the surface tension of alkali lye, make in alkali lye energy rapid osmotic to fiber and produce mercerization effect, need to add a certain amount of bleeding agent in alkali lye, cause the weak lye after mercerising easily to spume like this.
2, the impurity that during mercerising, cloth brings can fall in weak lye (as lint, staple fibre, slurry etc.), a large amount of impurity and slurry can affect the recycling of weak lye, are also to cause COD(COD in waste water), BOD(biochemical oxygen demand (BOD) or bod), suspended matter in SS(water quality) etc. root not up to standard.
3, because colourity during pulp is insecure, after mercerising, make weak lye with very dark colourity, have a strong impact on the recycle of alkali lye.
Above-mentioned three reasons: impurity, bleeding agent, colourity, reclaim to weak lye and bring very large difficulty.Create a large amount of salkali waste cannot recycle, cause waste and environmental pollution greatly, all bring negative effect to society, enterprise.According to the Committee of Development and Reform's the ten No. four file regulation in 2008, in order to specification dyeing is built, promote structural adjustment; protection of the environment; decreasing pollution, realizes dyeing sustainable development, and having formulated cotton article of manufacture is that main mercerization unit must be equipped with soda recovery unit.
But, because cannot to decolour or decolour high cost to light alkali in existing cowboy's mercerising production process, so discharge after neutralisation treatment can only being carried out to light alkali, before discharge, need a large amount of sulfuric acid of employing to carry out neutralisation treatment.The alkali of 1g needs the sulfuric acid of 1.225g to neutralize, and a mercerizing range output is 50000 meters of/day time, and output 45g/L weak lye is about 90t, needs 4.8t sulfuric acid to neutralize.The market price about 500 yuan/t of sulfuric acid, every day, about 2400 yuan of sulfuric acid added in sewage, and the waste of caustic soda is larger, also can produce 7t many salt every day, add the difficulty of biochemical wastewater treatment.Therefore, in cowboy's mercerising production process, production cost is high, also causes higher cost of sewage disposal to sewage treatment plant simultaneously.
Publication number is that the Chinese patent of CN101367592A discloses: " look alkali collection after a kind of field of printing and dyeing mercerising, except method and the equipment therefor of look ... device comprises multiple filter, multiple evaporimeter, hold the container of the look aqueous slkali after filtering and concentrating, the jet pump of hydrogen peroxide is sprayed in container, the aeration tube of accelerated reaction and the filter except solution impurity after dereaction, the proportioning valve wherein each evaporimeter being equipped with liquid level gauge and being controlled by it, after mercerising, look aqueous slkali is deposited in a reservoir successively after filter and evaporimeter concentrate, spray delivery side of pump and reservoir, aeration tube is immersed in look aqueous slkali, the outlet of container is provided with filter " technical scheme.
The recovery of light alkali and the technical problem of decolouring after how this technical scheme solving to a certain degree carries out mercerising.But the decolouring in this technical scheme realizes by injecting this mode of hydrogen peroxide in concentrated base, and the concentration of hydrogen peroxide is the highest can only about 30%, 70% is had to be water, because decolorizing effect is not obvious, need to increase addition, actual like this result in alkali concentrated after rare by force processing again, and the concentration of aqueous slkali is the principal element affecting mercerization effect.Only have the concentration when alkali lye reach a certain critical value after just can cause the acutely swelling of cotton fiber, then coordinate other felicity condition, fabric just can be made to obtain good mercerization effect.Therefore " dense " alkali decoloured in the above described manner have impact on follow-up recycling, and the operability of practical application is not strong.
Therefore technique that the decolouring of a kind of more effective and easy denim mercerising alkali lye reclaims jointly with bleeding agent is developed and system becomes problem in the urgent need to address.
Summary of the invention
For the technical problem existing for above-mentioned prior art, the present invention proposes one and first reclaims alkali light after mercerising and bleeding agent, then the denim mercerising alkali lye of decolouring not changing concentration and chemical characteristic reclaims with bleeding agent and the technique of decolouring and system.
The technical scheme that the present invention solves the problems of the technologies described above is: comprise the following steps: denim mercerising alkali lye is put into stillpot, after precipitation, upper liquid enters conveyance conduit by flow pump, simultaneously, decolorizer is pumped in conveyance conduit liquid by measuring pump, deliver to together again in evaporation concentrator, stillpot is entered after evaporation and concentration, supernatant after precipitation is directly recycled, bottom precipitated liquid is after centrifuge process, solid is separated to useless solid storage tank, and clear liquid turns back to stillpot, is recycled.
Above-mentioned denim mercerising alkali and bleeding agent reclaim with the technique of decolouring, and described decolorizer is the decolorizer containing effective chlorine.
Above-mentioned denim mercerising alkali and bleeding agent reclaim with the technique of decolouring, and described decolorizer is disinfectant or bleaching agent.
Above-mentioned denim mercerising alkali and bleeding agent reclaim with the technique of decolouring, and described decolorizer is the one or more combination of chlorine water, chlorine dioxide or clorox.
Above-mentioned denim mercerising alkali and bleeding agent reclaim with the technique of decolouring, and described decolorizer adopts On-line electrolytic dissolution method or chemical method preparation.
Above-mentioned denim mercerising alkali and bleeding agent reclaim with the technique of decolouring, and the concentration of effective chlorine in conveyance conduit liquid of described decolorizer is 10mg/L-500mg/L.
A kind of denim mercerising alkali and bleeding agent reclaim the system with decolouring, comprise the first stillpot, flow pump, measuring pump, decolorizer case, evaporation concentrator and the second stillpot, described first stillpot, flow pump, evaporation concentrator are directly connected by pipeline with the second stillpot, below the pipeline that flow pump is connected with evaporation concentrator, decolorizer case is connected by measuring pump, described first stillpot lower end outlet connection first centrifuge, described second stillpot lower end outlet connection second centrifuge.
The invention has the beneficial effects as follows: (1) the present invention adopts chlorine water, chlorine dioxide or clorox etc. to have the decolorizer of strong oxidizing property and decolouring function, can decolour and not affect the recovery of alkali and bleeding agent to alkali lye, clorox (effective chlorine density 100,000/) a small amount of in water can destroy the chromophoric group of dye molecule, but does not have an effect with the bleeding agent (surfactant) of NaOH and stable chemical nature; (2) high alkali liquid of the present invention's recovery is without secondary concentration, and arrange (avoiding in sulfuric acid and salkali waste) outward without strong brine, (film process can produce useless concentrate) will be processed without useless concentrate, produce (activated carbon decolorizing can produce a large amount of waste residue) without a large amount of solid waste, workable, can continuous productive process, reduce labour intensity, discharging intensity and production cost.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further detailed explanation, but the present invention is not limited to this.
As shown in Figure 1, denim mercerising alkali of the present invention and bleeding agent reclaim and comprise the first stillpot 1 with the system of decolouring, flow pump 2, evaporation concentrator 3, second stillpot 4, measuring pump 8 and decolorizer case 9, described first stillpot 1, flow pump 2, evaporation concentrator 3 is directly connected by pipeline with the second stillpot 4, below the pipeline that flow pump 2 is connected with evaporation concentrator 3, decolorizer case 9 is connected by measuring pump 8, described first stillpot 1 lower end outlet connection first centrifuge 6, and connect the first stillpot 1 upper end by return duct 10, described second stillpot 4 lower end outlet connection second centrifuge 12, and connect the second stillpot 4 upper end by return duct 13.
Embodiment 1
In the present invention, denim mercerising alkali and bleeding agent reclaim with the technique of decolouring as follows: denim mercerising alkali lye is put into the first stillpot 1, after precipitation, bottom is deposited in containing look weak lye major part impurity and suspended matter, upper liquid enters conveyance conduit by flow pump 2, simultaneously, open valve 7, decolorizer is pumped in conveyance conduit liquid by measuring pump 8, the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 10mg/L, decolorizer is delivered in evaporation concentrator 3 together with filtrate, the second stillpot 4 is entered after evaporation and concentration, impurity in high alkali liquid and suspended matter are deposited in bottom, supernatant after precipitation is directly recycled, first stillpot 1 bottom precipitated liquid flows into the first centrifuge 6 via valve 5, start centrifuge 6 by impurity and the heavy separation of suspended matter, solid is separated to useless solid storage tank, clear liquid turns back in the first stillpot 1 by return duct 10, the fiber substance that the part that this centrifugal process contains in light alkali after can removing mercerising is trickle and some other impurity, second centrifuge 4 bottom precipitated liquid is through flowing into the second centrifuge 12 via valve 11, start centrifuge 12, solid is separated to useless solid storage tank, clear liquid turns back in the second stillpot 4 by return duct 13, be recycled.Decolorizer in this example is the compound containing effective chlorine such as disinfectant, bleaching agent, chlorine water.
Embodiment 2
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 50mg/L.
Embodiment 3
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 100mg/L.
Embodiment 4
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 150mg/L.
Embodiment 5
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 200mg/L.
Embodiment 6
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 250mg/L.
Embodiment 7
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 300mg/L.
Embodiment 8
Adopt embodiment substantially the same manner as Example 2, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 350mg/L.
Embodiment 9
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 400mg/L.
Embodiment 10
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 450mg/L.
Embodiment 11
Adopt embodiment substantially the same manner as Example 1, unlike: the concentration of effective chlorine in conveyance conduit liquid of decolorizer is 500mg/L.
Claims (7)
1. a denim mercerising alkali and bleeding agent reclaim the technique with decolouring, comprise the following steps: denim mercerising alkali lye is put into stillpot, after precipitation, upper liquid enters conveyance conduit by flow pump, simultaneously, decolorizer is pumped in conveyance conduit liquid by measuring pump, deliver to together again in evaporation concentrator, stillpot is entered after evaporation and concentration, supernatant after precipitation is directly recycled, and bottom precipitated liquid is after centrifuge process, and solid is separated to useless solid storage tank, clear liquid turns back to stillpot, is recycled.
2. denim mercerising alkali according to claim 1 and bleeding agent reclaim and decoloration process, it is characterized in that: described decolorizer is the decolorizer containing effective chlorine.
3. denim mercerising alkali according to claim 1 and bleeding agent reclaim and decoloration process, it is characterized in that: described decolorizer is disinfectant or bleaching agent.
4. the denim mercerising alkali according to Claims 2 or 3 and bleeding agent reclaim and decoloration process, it is characterized in that: described decolorizer is the one or more combination of chlorine water, chlorine dioxide or clorox.
5. denim mercerising alkali according to claim 1 and bleeding agent reclaim and decoloration process, it is characterized in that: described decolorizer adopts On-line electrolytic dissolution method or chemical method preparation.
6. denim mercerising alkali according to claim 1 and bleeding agent reclaim and decoloration process, it is characterized in that: the concentration of effective chlorine in conveyance conduit liquid of described decolorizer is 10mg/L-500mg/L.
7. a denim mercerising alkali and bleeding agent reclaim the system with decolouring, comprise the first stillpot, flow pump, measuring pump, decolorizer case, evaporation concentrator and the second stillpot, described first stillpot, flow pump, evaporation concentrator is directly connected by pipeline with the second stillpot, below the pipeline that flow pump is connected with evaporation concentrator, decolorizer case is connected by measuring pump, described first stillpot lower end outlet connection first centrifuge, and be connected to the first stillpot upper end by return duct, described second stillpot lower end outlet connection second centrifuge, and be connected to the second stillpot upper end by return duct.
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| CN104862904B (en) * | 2015-05-15 | 2017-01-04 | 浙江映山红纺织科技有限公司 | The technique of Dyeing Silk with Acid Dyes and dyeing installation thereof |
| CN104862999A (en) * | 2015-05-15 | 2015-08-26 | 浙江映山红纺织科技有限公司 | Technology for dyeing polyester yarn by disperse dyes and dyeing equipment adopting technology |
| CN104831484B (en) * | 2015-05-15 | 2017-06-20 | 浙江映山红纺织科技有限公司 | The technique and its dyeing installation of acid dyes dyeing wool yarn |
| CN104846577B (en) * | 2015-05-15 | 2017-12-05 | 浙江映山红纺织科技有限公司 | The dye of positive ion contaminates the technique and its dyeing installation of Acrylic Fiber |
| CN104862990A (en) * | 2015-05-15 | 2015-08-26 | 浙江映山红纺织科技有限公司 | Technology for dyeing cotton/viscose yarn by reactive dyes and dyeing equipment adopting technology |
| CN104831487B (en) * | 2015-05-15 | 2018-04-24 | 浙江映山红纺织科技有限公司 | The technique and its dyeing installation of reactive dye dyeing wool yarn |
| CN107337291A (en) * | 2017-09-05 | 2017-11-10 | 韶关市顺昌布厂有限公司 | A kind of discoloration method and recovery method of the coloured salkali waste of textile finishing |
| CN109678288B (en) * | 2019-03-04 | 2021-05-28 | 南京大学 | Treatment method of printing and dyeing mercerizing wastewater for realizing alkali recovery |
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Effective date of registration: 20180507 Address after: 518001 Guangdong Shenzhen Luohu District Baoan South Road Shenzhen Hong Kong Court 20E Patentee after: SHENZHEN YUEPENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Address before: 411104 1 3 unit 302, No. 6 Jianzhong Road, Xiangtan, Hunan. Co-patentee before: Tao Xin Patentee before: Xiao Yongding |