CN1321071C - Method for treating waste liquid of cellulose ether production - Google Patents
Method for treating waste liquid of cellulose ether production Download PDFInfo
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- CN1321071C CN1321071C CNB2004100411999A CN200410041199A CN1321071C CN 1321071 C CN1321071 C CN 1321071C CN B2004100411999 A CNB2004100411999 A CN B2004100411999A CN 200410041199 A CN200410041199 A CN 200410041199A CN 1321071 C CN1321071 C CN 1321071C
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- waste liquid
- flue gas
- cellulose ether
- treating waste
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The present invention relates to an improvement of a liquid waste disposal technology during the production process of cellulose ethers, particularly to a cellulose ether liquid waste disposal method which has low cost and no three waste discharge, and can recycle useful salts. The method is characterized in that the produced waste liquor is sprayed in a spray dryer in the form of nepheloid, simultaneously the heat smoke gas discharged from a production boiler is introduced into the spray dryer to cause the both to exchange heat, the waste liquor is dried until the waste liquor has no liquor, exhausted with damp heat smoke gas, and introduced into a cyclone separator to carry out gas solid separation, solid salts are exhausted from the base of the separator, and the damp heat smoke gas is exhausted from the upper part of the separator, and led to a chimney. The method not only economically processes the waste liquor produced during production process, and reaches no waste water discharge, but also effectively reduces the air pollution caused by the smoke gas, protects the environment, recovers the useful salts, greatly reduces the cost of the liquid waste disposal, and provides an economic and effective process method for the waste liquor produced during the production process of the cellulose ethers.
Description
Technical field
The invention relates to the improvement to process for treating waste liquor in the ether of cellulose production process, it is low to relate in particular to a kind of cost, three-waste free discharge, and the ether of cellulose method for treating waste liquid of recyclable useful salt.
Background technology
Can produce a large amount of salt bearing liquid wastes in the cellulose ethers production process, need be to its further processing.For example Xylo-Mucine (CMC) is produced, and is by purified cotton, liquid caustic soda, Mono Chloro Acetic Acid, alcohol solvent mixing, through alkalization, etherification reaction, forms through refining, dry, pulverizing again.A large amount of in process of production alcohol solvents that use do not participate in reaction, need by the distillation recycling use.Yet in reclaiming distillation, after alcohol solvent is steamed, stay the sodium chloride solution that the interior waste liquid of still pot is mainly high COD, and its amount is relatively large, generally produces the sodium chloride aqueous solution 0.6-0.8m that one ton of CMC need produce approximately
3About, this discharging of waste liquid then can cause the severe contamination to environment.The existing for this reason Xylo-Mucine of producing is handled the high COD sodium chloride solution that produces, and the sector adopts two kinds of methods so far, a kind of be earlier with its evaporation concentration then with burning residual dregs; Another kind is it to be carried out biochemical fermentation handle to reduce COD, makes emission treatment then.It is high that yet the former concentrates not only power consumption, and easily cause equipment corrosion, burning residual dregs, and its chlorion also can produce corrosive nature to boiler, so service life of equipment is short, the processing cost height.The latter not only facility investment is big, the water consumption height, and processing cost is higher, and can only make COD obtain the part degraded, and degraded back salt bearing liquid wastes is handled not thorough still for discharging.Especially two kinds of treatment processs all can not reclaim useful sodium-chlor, cause the waste of raw material resources.
Other ether of cellulose production processes equally also can produce a large amount of similar brine wastes, and treatment process all is to adopt aforesaid method.Therefore up to now, a large amount of salt bearing liquid wastes processing costs that produce in the cellulose ethers production process are higher, can not be utilized effectively, and become the difficult problem that the sector can't overcome.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of processing simple, cost is low, not only recyclable wherein salt, and non-wastewater discharge again, free from environmental pollution, and can produce the production of cellulose ether method for treating waste liquid of gas cleaning to production process simultaneously.
The object of the invention realizes, taking method is that the salt bearing liquid wastes that will reclaim behind the solvent (as ethanol) is introduced in the spray-dryer with atomizing type, to produce the high-temperature flue gas of boiler discharge simultaneously also introduces in the spray-dryer, make both contact heat exchange, the waste liquid amount that control is introduced, make desciccate be gas-solid and mix (no longer including liquid) form simultaneously from the discharge of moisture eliminator bottom, introduce cyclonic separator, carry out gas solid separation, isolating solid salt is discharged by the separator bottom, flue gas, water vapor imports chimney through induced draft fan and discharges, thereby finishes liquid waste disposal, the recovery of useful salt, reach no discharging of waste liquid, the while because of flue gas contacts with waste liquid, also can make flue gas to a certain degree be purified in this process.Specifically, production of cellulose ether method for treating waste liquid of the present invention, the salt bearing liquid wastes that it is characterized in that reclaiming behind the solvent sprays into spray-dryer in vaporific mode, to produce the hot flue gas of boiler discharge simultaneously introduces in the spray-dryer, make both heat exchange waste liquid is dried to absence of liquid, discharge the introducing cyclonic separator simultaneously with damp and hot flue gas and carry out gas solid separation, solid salt is discharged by the separator bottom, and damp and hot flue gas is discharged by separator top and entered chimney.
The inventive method is effectively to reduce to reclaim flue dust impurity in the salt, and the hot flue gas of described boiler high temperature is preferably handled through high-temperature dust removal earlier, as the multi-tube dust cleaner dedusting before introducing spray-dryer.In addition for making full use of fume afterheat, the damp and hot flue gas that can discharge through cyclonic separator also, by two-phase heat-exchanger (for example coil tube type, heat exchanger such as board-like, finned), heating boiler is supplied with water or to the boiler combustion preheating of air.
The present invention is owing to adopt above-mentioned technology, not only economic treatment the waste liquid that produces of production process, reach non-wastewater discharge, protected environment, but also reclaimed useful salt, greatly reduce the processing cost that produces waste liquid; Secondly, dispose waste liquid with high-temperature flue gas, also effectively reduce dust contained flue gas, sulfur content, alleviated the pollution of smoke evacuation to air, the waste liquid that produces for the cellulose ethers production process has found a cost-effective treatment process.To produce CMC is example, and the inventive method concentrates and burns, and one ton of CMC finished product of every production can be sparing in the use of coal 235 kilograms, reduces coal consumption 12.7% on year-on-year basis, has reduced production cost, has saved the energy; And about 310 kilograms in recyclable industrial sodium-chlor.
Below in conjunction with an embodiment, further specify the present invention.
Description of drawings
Accompanying drawing is the inventive method embodiment process flow sheet.
Specific implementation method
Embodiment: referring to accompanying drawing, to produce Xylo-Mucine (CMC) is example, salt bearing liquid wastes behind the distillating recovering solvent, spray into spray-dryer 2 with vaporific by top, top, the boiler combustion flue gas is (less reduction temperature) after multi-tube dust cleaner 1 dedusting, sends into spray-dryer (both can make full use of flue gas heat, and can reduce the adverse current resistance again) by spray-dryer top, with vaporific waste liquid heat exchange, incite somebody to action wherein moisture evaporation.Control enters waste liquid amount, the spray-dryer absence of liquid is discharged, dry post chlorization sodium is discharged by the spray-dryer bottom with flue gas, water vapor, enter cyclonic separator 3, make gas, carry out cyclonic separation admittedly, solid sodium chloride is then discharged through separator Blowing stopper 4 by the separator bottom, damp and hot flue gas is then discharged by separator top, import tubular heater exchhanger 5, heating boiler is supplied with water (or combustion air), and the flue gas after heat exchange enters the cigarette fontanel by induced draft fan 6.
Other ether of cellulose method for treating waste liquid, the same substantially.
Claims (6)
1, a kind of production of cellulose ether method for treating waste liquid, the salt bearing liquid wastes that it is characterized in that reclaiming behind the solvent sprays into spray-dryer in vaporific mode, to produce the hot flue gas of boiler discharge simultaneously introduces in the spray-dryer, make both heat exchange waste liquid is dried to absence of liquid, discharge the introducing cyclonic separator simultaneously with damp and hot flue gas and carry out gas solid separation, solid salt is discharged by the separator bottom, and damp and hot flue gas is discharged by separator top and entered chimney.
2,, it is characterized in that said flue gas is entered by spray-dryer top according to the described production of cellulose ether of claim 1 method for treating waste liquid.
3, according to claim 1 or 2 described production of cellulose ether method for treating waste liquid, it is characterized in that said flue gas is first through the high-temperature dust removal processing, introduce spray-dryer again.
4,, it is characterized in that said high-temperature dust removal is treated to the multi-tube dust cleaner dedusting according to the described production of cellulose ether of claim 3 method for treating waste liquid.
5, according to claim 1,2 or 4 described production of cellulose ether method for treating waste liquid, it is characterized in that the damp and hot flue gas that said cyclonic separator is discharged, after heat exchange, enter the cigarette fontanel.
6, according to the described production of cellulose ether of claim 3 method for treating waste liquid, it is characterized in that the damp and hot flue gas that said cyclonic separator is discharged, after heat exchange, enter the cigarette fontanel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100411999A CN1321071C (en) | 2004-07-05 | 2004-07-05 | Method for treating waste liquid of cellulose ether production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100411999A CN1321071C (en) | 2004-07-05 | 2004-07-05 | Method for treating waste liquid of cellulose ether production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1594113A CN1594113A (en) | 2005-03-16 |
| CN1321071C true CN1321071C (en) | 2007-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100411999A Expired - Fee Related CN1321071C (en) | 2004-07-05 | 2004-07-05 | Method for treating waste liquid of cellulose ether production |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344225B (en) * | 2011-07-03 | 2013-01-23 | 赫克力士天普化工有限公司 | Processing method of salty wastewater in cellulose ether production |
| CN103101985A (en) * | 2011-11-11 | 2013-05-15 | 承源环境科技企业有限公司 | Purifying method and apparatus of recycling waste liquid of organic solvent |
| CN103496826B (en) * | 2013-10-12 | 2015-04-01 | 常州大学 | Method of pretreating acidic CMC (carboxymethylcellulose) condensate by UBF process |
| CN104355142A (en) * | 2014-11-07 | 2015-02-18 | 南通密炼捏合机械有限公司 | Conveying device used after cotton or wood pulp paper velvet forming in CMC (carboxy methyl cellulose) production |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068090A (en) * | 1992-05-14 | 1993-01-20 | 周开庆 | Method for treating sucrose waste liquid |
| US5726405A (en) * | 1995-10-11 | 1998-03-10 | White; Jeffrey A. | Waste water treatment method and apparatus |
| WO1999067003A1 (en) * | 1998-06-23 | 1999-12-29 | Shell Internationale Research Maatschappij B.V. | Process for the treatment of waste water |
-
2004
- 2004-07-05 CN CNB2004100411999A patent/CN1321071C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068090A (en) * | 1992-05-14 | 1993-01-20 | 周开庆 | Method for treating sucrose waste liquid |
| US5726405A (en) * | 1995-10-11 | 1998-03-10 | White; Jeffrey A. | Waste water treatment method and apparatus |
| WO1999067003A1 (en) * | 1998-06-23 | 1999-12-29 | Shell Internationale Research Maatschappij B.V. | Process for the treatment of waste water |
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| CN1594113A (en) | 2005-03-16 |
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