CN104150668A - Method for multiple-effect evaporation treatment of chemical mother solution wastewater - Google Patents
Method for multiple-effect evaporation treatment of chemical mother solution wastewater Download PDFInfo
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- CN104150668A CN104150668A CN201410368697.8A CN201410368697A CN104150668A CN 104150668 A CN104150668 A CN 104150668A CN 201410368697 A CN201410368697 A CN 201410368697A CN 104150668 A CN104150668 A CN 104150668A
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- mother liquor
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- 238000000034 method Methods 0.000 title claims abstract description 109
- 238000001704 evaporation Methods 0.000 title claims abstract description 93
- 230000008020 evaporation Effects 0.000 title claims abstract description 89
- 239000000126 substance Substances 0.000 title claims abstract description 75
- 239000010413 mother solution Substances 0.000 title abstract 4
- 230000008569 process Effects 0.000 claims abstract description 69
- 230000000694 effects Effects 0.000 claims abstract description 65
- 238000005194 fractionation Methods 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 239000007791 liquid phase Substances 0.000 claims abstract description 6
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
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- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 1
- SMZHKGXSEAGRTI-UHFFFAOYSA-N 1,1,1-trichloropropan-2-one Chemical compound CC(=O)C(Cl)(Cl)Cl SMZHKGXSEAGRTI-UHFFFAOYSA-N 0.000 description 1
- CDULGHZNHURECF-UHFFFAOYSA-N 2,3-dimethylaniline 2,4-dimethylaniline 2,5-dimethylaniline 2,6-dimethylaniline 3,4-dimethylaniline 3,5-dimethylaniline Chemical group CC1=CC=C(N)C(C)=C1.CC1=CC=C(C)C(N)=C1.CC1=CC(C)=CC(N)=C1.CC1=CC=C(N)C=C1C.CC1=CC=CC(N)=C1C.CC1=CC=CC(C)=C1N CDULGHZNHURECF-UHFFFAOYSA-N 0.000 description 1
- SYEYEGBZVSWYPK-UHFFFAOYSA-N 2,5,6-triamino-4-hydroxypyrimidine Chemical compound NC1=NC(N)=C(N)C(O)=N1 SYEYEGBZVSWYPK-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a method for the multiple-effect evaporation treatment of chemical mother solution wastewater. The method is mainly characterized in that at least two evaporators are sequentially arranged in series to form multiple-effect evaporation treatment, the mother solution wastewater and a vapor phase upstream flow and are continuously evaporated; gas-liquid phase steam stripping fractionation type separation is formed under the action of a part with steam stripping fractionation effect in the evaporation process of the mother solution wastewater, dephlegmating water is recycled after being treated or directly, and the like. The method disclosed by the invention has the characteristics of being scientific and reasonable in method, high in treatment efficiency and low in treatment cost, achieving cost reduction and environmental friendliness because treated dephlegmating liquid can be recycled to a process, and the like.
Description
Technical field
The present invention relates to a kind of method that chemical mother liquor waste water multiple-effect evaporation is processed, belong to technology of chemical engineering, specifically belong to chemical wastewater treatment engineering.
Background technology
Chemical mother liquor waste water involved in the present invention, refers to the chemosynthesis mother liquor of fine chemistry industry and medication chemistry product, the remaining waste water getting off after the synthetic Chemicals of chemical technology and pharmaceutical prod.
In this described class waste water, general all contain volatile, the perishable light constituent that comprises the low alcohols that boils, aldehydes, ester class, fatty acid, organic amine, ketone, hydro carbons, halogenated hydrocarbon etc. and hydrochloric acid, carbonic acid gas, hydrogen sulfide, dithiocarbonic anhydride, prussic acid, Hydrogen bromide, hydrofluoric acid, silicofluoric acid, nitric acid etc., and comprise the high heavy constituent of gas phase solubleness of oil of mirbane, vinylpyridine, aniline, phenol, xylidine, turps, desolate alkali, methylarecaidin, former hoary hair element, Nicotine, rose wet goods.So there is the discharge naturally of the waste water of number of chemical component, be undoubtedly a kind of waste of resource, and can be to environment.
Yet, if this described class waste water is difficult to process with general biological method, and the effective ways that people have been familiar with, exactly the moisture in described waste water is evaporated, but the processing cost of this method is very high, evaporate 1 ton of waste water and need to consume 1 ton of steam, and 1 ton of steam to spend 300 yuan (RMB) left and right.
Because administer chemical wastewater, be an important ring of protection of the environment, and chemical wastewater is mainly that comprehensive wastewater is administered at present.Due to chemical wastewater, particularly the general saltiness of doctorization class waste water is high, and Pollutant levels are high, complicated component, toxicity is high, is difficult to biochemical degradation, make general comprehensive treatment effect undesirable, although have burning, evaporation, absorption, the effective treating methods such as high performance membrane processing, but its cost is high, and with high side effect, be difficult to generally implement.How to reduce costs and reduce the key that side effect is this class improvement method of enforcement.
Comparatively speaking, multiple-effect evaporation can solve part energy consumption problem, has certain process advantage, but steam lime set, still needs secondary treatment, and more useless residual dope more needs to do finalization process, so be not still a low-cost solution.
And the chemical wastewater multiple-effect evaporation of prior art is processed and generally only to be considered energy consumption saving, and its dosing modifier treatment before evaporation can destroy state of matter, and does not consider separating substances and the separated reuse of material afterwards, and the total cost after making it energy-conservation is still very large.
For this reason, research and develop a kind of method reasonable, processing cost is low, and the treatment process of the new described waste water of joint material environmental protection, just becomes expectation in the industry.
Summary of the invention
The present invention aims to provide that a kind of technique is reasonable, processing efficiency is high, processing cost is low, fall the method that a kind of chemical mother liquor waste water multiple-effect evaporation of this environmental protection is processed, and to overcome the deficiency of prior art, meets the growing needs of chemical engineering industry.
The present invention realizes the technical though of its object: the one, and adopt and be arranged in order by a plurality of vaporizers the multiple-effect evaporation treatment facility that series connection forms, described waste water is implemented to gradual consecutive evaporation and process; The 2nd, described waste water is introduced by the top of described last vaporizer of vaporizer series upstream extremity, and by the steam heater that is used for heating, be located at described vaporizer downstream end described in last in vaporizer, and make described waste water go in the same direction with the secondary steam that raw steam and the evaporation of described waste water generate with heating, thereby form multiple-effect countercurrent evaporation; The 3rd, parts (and described last vaporizer of wastewater streams downstream end possess stripping and fractionation effectiveness is set in described vaporizer, the parts that possess stripping and fractionation effectiveness described in can substituting with interior tubular heater exchhanger, described waste water flows along the inner tubal wall of interior tubular heater exchhanger, raw steam heats described waste water liquid film outside interior tubular heater exchhanger inwall), make described waste water with described in possess stripping and fully contact with the parts of fractionation effectiveness, make it when carrying out vaporize water, implement the evaporation process of stripping and fractionated form; The 4th, the phlegma of each single-effect evaporator is carried out respectively to classification, and with itself and technique the applying mechanically of liquid that feed intake, realize the environmental protection of joint material, thereby realize object of the present invention.
Based on above technical though, the purport technical scheme that the present invention realizes its object is:
The method that chemical mother liquor waste water multiple-effect evaporation is processed, the chemical mother liquor waste water that contains a small amount of residue chemistry component of take is processed object, and the vaporizer that to take by steam be heating source is treatment facility, and its innovative point is, and its processing policy is:
A, described vaporizer have 2 at least, and at least one vaporizer possesses stripping fractionation effectiveness parts; Described at least 2 described vaporizers, are arranged in order and are connected in series to temperature end by low-temperature end, form thus multiple-effect evaporation and process serial equipment; And it is located at temperature end described in last in vaporizer by giving birth to steam-heated heating unit;
B, described processed object chemistry mother liquor waste water, first described vaporizer from low-temperature end enters, and the vaporizer series along described arrangement series connection flows and shifts to temperature end, and go in the same direction with the raw steam of initial heating use and the secondary steam being generated by the evaporation of processed object chemistry mother liquor waste water, thereby forming multiple-effect countercurrent evaporation processes, realize processed object chemistry mother liquor waste water, the multiple-effect evaporation under the flow direction of stripping fractionation separates;
C, described processed object chemistry mother liquor waste water, in the process with described steam move toward one another, fully contact with the described parts that possess stripping fractionation effectiveness the Gas-Liquid Contacting exchange of carrying out chemical composition, make it in vaporize water process, wherein contained chemical composition is carried out to the separated of gradual stripping and fractionated form, by each effect evaporation, obtain respectively minute lime set of enrichment chemical composition;
D, describedly by stripping fractionation separates minute lime set out, import respectively in special-purpose storage tank, at it by after processing or directly implementing to apply mechanically with the chemistry liquid that feeds intake with corresponding technique respectively, thereby realize cost efficiency, energy-conserving and environment-protective;
And described processed object chemistry mother liquor waste water, from being positioned at the top of the first vaporizer of the vaporizer described waste water upstream extremity of series, enter, by possessing stripping fractionation effectiveness parts, flow down, the secondary steam that described chemical mother liquor waste water evaporation generates under partition steam heating upwards flows, and produces thus the effect of liquid phase convective exchange; The secondary steam producing at described waste water and evaporator downstream device exists under the condition of the temperature difference, makes the heavy constituent condensation fractionation in the described wastewater streams secondary steam that vaporizer produces downstream and dissolves in described waste water; And the described waste water stripping effect produced with fully contacting of secondary steam makes again light constituent diffusion transfer in described waste water in secondary steam, finally along with secondary steam is condensed into phlegma; So each single-effect evaporator continues to carry out in proper order, process, and described phlegma provides prerequisite for technique feeds intake with applying mechanically of chemical principle feed liquid until complete the multiple-effect evaporation of described waste water.
The above-described stripping of the present invention, is also referred to as to resolve.Refer to that described steam and described warm waste water are by the exchange of phase, some chemical composition and the spontaneous liquid that make to be present in described waste water produce decomposition, and the material decomposing out precipitate into the physical process in vapor phase.
And be present in some the high boiling point chemical composition in secondary steam, and after at steam, by heat exchange, temperature reduces, again can partial condensation and be dissolved in described waste water.This physical process meaning for fractionation.
Technique scheme of the present invention, is embodied in its accompanying drawing 1.
By ginseng, read accompanying drawing, and can know in conjunction with technical though of the present invention, the present invention has realized its object that will realize.
By above given technical scheme, can be understood, vaporizer of the present invention has good stripping (or claiming to resolve), fractionation usefulness.It is improved to stripping fractionation evaporation by single evaporation; And its multiple-effect evaporation is improved to multiple-effect stripping fractionation evaporation.The present invention is by repetition test and comparative analysis, and the multiple-effect evaporation of advocating is 2 ~ 8 effects.Because 2 ~ 4 effect evaporations are both economical in equipment cost and energy consumption, the multiple-effect evaporation that the present invention further advocates is 2 ~ 4 effect evaporations.Especially because the investment of 3 effects evaporations is few, energy consumption is more economized (be about other evaporation energy consumption 40%), and further preferably 3 effect evaporations of the present invention.Experiment showed, that this 3 effect evaporations are particularly suitable for the processing of doctorization product mother liquid waste water.
And the present invention is when implementing vaporize water process to described waste water, the chemical composition of gently boiling is carried out to the separated of stripping and fractionated form, the general multiple-effect evaporation that it is different from prior art has increased stripping (parsing) fractionation separates function, and so-called stripping fractionation is, the secondary steam that described waste water produces and the light constituent in liquid, still carry out mass transfer and the exchange of conducting heat, light constituent in liquid phase moves towards in gas phase, heavy constituent in gas phase is moved towards in liquid phase, and in stripping fractionation process, described waste water (compared with cold conditions) is to dirty, and hot gas (steam) is to upper reaches.With this understanding, increase and possess the parts that strengthen stripping fractional distillation functions, make phase due to the lifting of both contacts area, and effectively improve stripping fractionation usefulness.The described parts that the present invention selects by repeated tests (or claiming chemical filler) are the chemical fillers that comprises Raschig ring, Pall ring, Xi Ta ring and ball, or comprise the Trays in Chemical Industry of sieve plate, floating web plate and bubble plate or the tower pipe of wet-wall tower.The present invention is the tower pipe of wet-wall tower preferably.
Because the present invention wants the concentration of object waste water of evaporation process high, complicated components, corrodibility is strong, in order to prevent vaporizer and the secondary pollution of described waste water chemical reaction product to described waste water, with effective raising its working life, the described vaporizer that the present invention advocates is protection against corrosion vaporizer, and the structure formation of described protection against corrosion vaporizer, corrosion resistant metal body or lining corrosion resistant metal body, or vitreum or lining or lass lining body, or graphite body or lining graphite body, or silicon carbide body or lining or sintered silicon carbide body, or corrosion-resistant rubber and plastic body or serve as a contrast corrosion-resistant rubber and plastic body.What the present invention actively recommended is graphite body or lining graphite body.And described graphite body is the graphite body being strengthened by carbon fibre web or carbon nanotube silk screen.
And described lining corrosion resistant metal body, lining or lass lining body, lining graphite body, lining or sintered silicon carbide body, the corrosion-resistant rubber and plastic body of lining, be shell and be the complex body of anticorrosive product body described in the liner of metallic object.
Wherein, the present invention actively advocates, corrosion-resisting evaporator is that chuck heating and two-way all employing of being heated strengthen full graphite evaporator prepared by graphite material.
The present invention is in its evaporation process process, according to including different boiling component (component of gently boiling and the component of heavily boiling in described waste water, or claim light constituent and heavy constituent) the practical situation requirement of evaporation process, from described wastewater streams to upstream under temperature in each vaporizer of being arranged in order of trip, by the flow direction of described waste water, arrange respectively from low to high control, simultaneously in order to strengthen stripping fractionation effectiveness, interior pressure in described vaporizer, by the flow direction of described waste water, arrange respectively from low to high control.The present invention advocates in described vaporizer, there is certain interior pressure; And temperature is in 35 ~ 175 ℃ of interval ranges in described vaporizer, and the temperature in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams downstream last vaporizer increase one by one; And in it, be pressed in-0.10 ~+0.8Mpa interval range, and the interior pressure in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams downstream last vaporizer rise one by one; And between each vaporizer, waste water circulation is to be moved to the downstream forced conveyance of described waste liquid by liquid pump; And the waste water of each vaporizer inside conducts heat by natural flow, separate out a fixed solid in evaporating waste water process after, each vaporizer adopts liquid pump high volume circulation transport wastewater to force heat transfer more suitable.
Certainly, stripping of the present invention distills evaporation process process also can be arranged in following current, and wastewater streams is to consistent with steam flow, and while having enough negative pressure in vaporizer, described waste water can not need liquid pump to flow and move voluntarily.This layout separation efficiency reduces, but cost is lower slightly, should also belong to the present invention and advocate scope.
For not changing described chemical mother liquor waste water component, to make phlegma provide the consideration of prerequisite, the present invention to advocate for technique the applying mechanically of liquid that feed intake, before described chemical mother liquor waste water is processed, be adding medicine neutralizing treatment not, not destroy the chemical composition of chemical mother liquor.Unless chemicals treatment is not destroyed chemical constitution, or add medicament can be conducive to separating substances (amine that certain organic salt is volatilizable separation as changed or acid).
In order to realize energy-conservation of consumption reduction and environment protection; the present invention also advocates; described phlegma of respectively imitating fractional condensation; according to its one-tenth, be grouped into and carry out classification; all or part of cover is used in the technique of chemical reaction source; as feed intake water and/or material composition of raw material, supplement and/or process water, to realize " three wastes " zero release to environment.
After technique scheme is implemented in full, the methodological science that the present invention has is reasonable, and processing cost is low, and processing efficiency is high, the phlegma that gets off processed can reuse, the features such as basic three-waste free discharge, are apparent.
Accompanying drawing explanation
Fig. 1 is the triple effect band stripping fractionation parts countercurrent evaporation process flow diagram of a kind of embodiment of the present invention.Shown in figure: 1 is triple-effect evaporator, 2 is 2nd effect evaporator, 3 is 1st effective evaporator, and 4 is an effect steam heater (straight pipe type heat exchanger), and 5 is triple effect condenser, 6 is triple effect condensate cooler, the 7 steam condensate grooves of making a living, 8 is an effect water of condensation groove, 9 is two effect water of condensation grooves, 10 is that triple effect water of condensation groove, 11 is liquid pump, and 12 is stripping fractionation member segments.
Shown in figure, described waste water sprays in stripping fractionation member segments 12 in spray mode.
Visible as shown in Figure 1, it is triple effect evaporation treatment facility.
Fig. 2 is a kind of process program figure that realizes effective constituent separation and water cycle and zero release of the present invention;
Fig. 3 is the process program figure of a kind of gently boil thing separating treatment and process water recycled of the present invention;
Fig. 4 is the process program figure of the present invention's a kind of sulfuric acid water separating treatment and process water recycled;
Fig. 5 is the process program figure of a kind of hydrochloric acid water separating treatment of the present invention and process water recycled.
Embodiment
A kind of typical concrete implementing procedure of the present invention, asks for an interview accompanying drawing 1 triple effect band stripping fractionation evaporation technology schematic flow sheet.
The method that chemical mother liquor waste water multiple-effect evaporation is processed, refers to accompanying drawing 1, and it take the chemical mother liquor waste water that contains a small amount of residue chemistry component is processed object, and the vaporizer that to take by steam be heating source is treatment facility, and its processing policy is:
A, described vaporizer have 3, and wherein have 2 vaporizers to possess stripping fractionation effectiveness parts; Described 3 described vaporizers, are arranged in order and are connected in series to temperature end by low-temperature end, form thus multiple-effect evaporation and process serial equipment; And it is located at temperature end described in last in vaporizer by giving birth to steam-heated heating unit;
B, described processed object chemistry mother liquor waste water, first described vaporizer from low-temperature end enters, and the vaporizer series along described arrangement series connection flows and shifts to temperature end, and go in the same direction with the raw steam of initial heating use and the secondary steam being generated by the evaporation of processed object chemistry mother liquor waste water, thereby forming multiple-effect countercurrent evaporation processes, realize processed object chemistry mother liquor waste water, the multiple-effect evaporation under the flow direction of stripping fractionation separates;
C, described processed object chemistry mother liquor waste water, in the process with described steam move toward one another, fully contact with the described parts that possess stripping fractionation effectiveness the Gas-Liquid Contacting exchange of carrying out chemical composition, make it in vaporize water process, wherein contained chemical composition is carried out to the separated of gradual stripping and fractionated form, by each effect evaporation, obtain respectively minute lime set of enrichment chemical composition;
D, describedly by stripping fractionation separates minute lime set out, import respectively in special-purpose storage tank, at it by after processing or directly implementing to apply mechanically with the chemistry liquid that feeds intake with corresponding technique respectively, thereby realize cost efficiency, energy-conserving and environment-protective;
And described processed object chemistry mother liquor waste water, from being positioned at the top of the first vaporizer of the vaporizer described waste water upstream extremity of series, enter, by possessing stripping fractionation effectiveness parts, flow down, the secondary steam that described chemical mother liquor waste water evaporation generates under partition steam heating upwards flows, and produces thus the effect of liquid phase convective exchange; The secondary steam producing at described waste water and evaporator downstream device exists under the condition of the temperature difference, makes the heavy constituent condensation fractionation in the described wastewater streams secondary steam that vaporizer produces downstream and dissolves in described waste water; And the described waste water stripping effect produced with fully contacting of secondary steam makes again light constituent diffusion transfer in described waste water in secondary steam, finally along with secondary steam is condensed into phlegma; So each single-effect evaporator continues to carry out in proper order, process, and described phlegma provides prerequisite for technique feeds intake with applying mechanically of chemical principle feed liquid until complete the multiple-effect evaporation of described waste water.
And the number of described vaporizer is 3, thereby realize 3 effect evaporation process.
And described in possess the parts of stripping fractionation effectiveness, be the chemical filler that comprises Raschig ring, Pall ring, Xi Ta ring and ball, or comprise the Trays in Chemical Industry of sieve plate, floating valve tray and bubble plate or the tower pipe of wet-wall tower; With this, increase the contact area of described waste water and steam, improve stripping and fractionation effect.The present invention is the tower pipe of wet-wall tower preferably.
And described vaporizer is corrosion-resisting evaporator; And the structure formation of described corrosion-resisting evaporator, corrosion resistant metal body or lining corrosion resistant metal body, or vitreum or lining or lass lining body, or graphite body or lining graphite body, or silicon carbide body or lining or sintered silicon carbide body, or corrosion-resistant rubber and plastic body or serve as a contrast corrosion-resistant rubber and plastic body.
And described corrosion-resisting evaporator is chuck heating and the two-way graphite evaporator that all adopts enhancing graphite material to prepare that is heated.
And in described vaporizer, there is certain interior pressure; And temperature is in 35 ~ 175 ℃ of interval ranges in described vaporizer, and the temperature in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams downstream last vaporizer increase one by one; And in it, be pressed in-0.10 ~+0.8Mpa interval range, and the interior pressure in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams downstream last vaporizer rise one by one; And between each vaporizer, waste water circulation is to be moved to the downstream forced conveyance of described waste liquid by liquid pump; And the waste water of each vaporizer inside conducts heat by natural flow, separate out a fixed solid in evaporating waste water process after, each vaporizer adopts liquid pump high volume circulation transport wastewater to carry out forced heat-exchanging.
And before described chemical mother liquor waste water processes, be adding medicine neutralizing treatment not, not destroy the chemical composition of chemical mother liquor.
And described phlegma of respectively imitating fractional condensation is grouped into according to its one-tenth and carries out classification, all or part of cover is used in the technique of chemical reaction source, supplements and/or process water, to realize " three wastes " zero release to environment as feed intake water and/or material composition of raw material.
Below the present invention further provides 4 specific embodiments, referring to accompanying drawing 1.
Embodiment 1, as shown in Figure 1, the trend of described chemical mother liquor waste water is: described mother liquor waste water enters triple-effect evaporator 1 stripping fractionation evaporation through triple effect condenser 5, separated go to enter after part light constituent in 2nd effect evaporator 2, continue stripping fractionation evaporation, after dividing again the part light constituent of leaving away, enter liquid pump forced circulation evaporation in 1st effective evaporator 3, to enrichment stage, discharge, ejecta continues concentrated can return 1st effective evaporator 3 after dividing the solid impurity of leaving away in again.Steam and secondary steam trend are: raw steam is to 1st effective evaporator 3 and the 4 chuck heating of one effect well heater, the steam condensate of himself condensation, import raw steam condensate groove 7, in 1st effective evaporator 3, heated partial material waste water gasification is secondary steam, 2nd effect evaporator 2 is heated, and the fractional condensation water of himself condensation imports an effect water of condensation groove 8; After the part waste water material gasification fractionation of heating in 2nd effect evaporator 2, remaining secondary steam heats triple-effect evaporator 1 chuck, and the fractional condensation water of himself condensation imports two effect water of condensation grooves 9; After the part waste water material gasification fractionation of heating in triple-effect evaporator 1, the be condensed fractional condensation water 3 of device 5 and condensate cooler 6 condensing coolings of remaining secondary steam imports triple effect water of condensation grooves 10; Non-condensable gases discharges after being processed by vacuum purification system.
Evaporating and the actual operation parameters thereof of typical triple effect band stripping fractionation are:
The main material of vaporizer a: effect: lass lining
Two effects: impregnated graphite
Triple effect: impregnated graphite
Stripping distillation stage form: wet-wall tower φ 20 tower pipes
Steam capability: about 3m
3water/h
Evaporation energy consumption: 0.42T steam/T vaporize water
Operation strategy a: effect: 70 ~ 125 ℃ ,-0.03 ~+0.05MPa
Two effects: 60 ~ 85 ℃ ,-0.08 ~-0.05MPa
Triple effect: 45 ~ 70 ℃ ,-0.098 ~-0.06MPa
Stripping fractionation parts stage number: two effects, triple effect adds up to 4 ~ 6
The thing that gently boils generally distributes: triple effect: 50 ~ 60%, two effects: 25 ~ 40%, one effect: 5 ~ 10%.
Waste water is collected light constituent at the first low temperature start vaporizer of triple effect, then improves temperature to two effects, then improves temperature to an effect, and this countercurrent evaporation flow process is particularly suitable for holding in priority reclamation high temperature labile chemical composition.
From content described above, the evaporation of multiple-effect band stripping fractionation more also exists other different from general multiple-effect evaporation, general multiple-effect evaporation can be increased operation rate an effect secondary steam injection in the raw steam of high pressure of heating, and the present invention does not adopt, because can pollute like this water of condensation of raw steam, expand wastewater treatment capacity.General multiple-effect evaporation is normal adopts simple following current operation, and the present invention's recommend adoption not, because like this, waste water at the beginning enters from the 1st effective evaporator of the highest temperature, and unstable component is at high temperature easily decomposed, and effective constituent is easily destroyed, and is unfavorable for effective utilization.General multiple-effect evaporator often adopts stainless steel or glass lined material, and equipment is subject to acid, brine corrosion serious, and the present invention adopts corrosion-resistant design, particularly adopts graphite product, and its two-way anticorrosion corrosion resistant performance greatly improves.
Minute lime set that the evaporation of multiple-effect band stripping fractionation is separated, can overlap to use in chemical reaction source and go.Chemistry mother liquor waste water component can be divided into: water, light constituent solvent based material, crystallizable class useful matter, curable class organic impurity, inorganic salt, the not composition such as curable liquid.
The processing of chemistry mother liquor waste water is a systems engineering.Below to utilize the evaporation process of multiple-effect band stripping fractionation to realize a kind of process program (referring to accompanying drawing 2) of effective constituent separation and water cycle and zero release to chemical mother liquor waste water.The present invention adopts the method for the evaporation process chemistry mother liquor waste water of multiple-effect band stripping fractionation, be a kind of take into account and reached reduce the separated of energy consumption and active substance, design proper effective constituent and process water and apply mechanically scheme, can make effective, low-cost, the green processing of chemical mother liquor waste water of more type, even producing economic benefit, is the method that can promote.
Embodiment 2. as shown in Figure 1, a kind of method of gently boil thing separating treatment and process water recycled.YS is a kind of additive, is by TP, NB and TCA(trichloroacetone) in water condensation form, wherein TCA is that solvent-borne type raw material has certain volatility.Condensed mother liquor waste water composition: organochlorine 1.5%, sodium sulfate 1%, sodium-chlor 1%, COD 25000 mg/L, acidity PH3.Former employing neutralizing treatment is fallen TCA and is carried out multiple-effect evaporation again, produces the solidifying water of steaming of COD approximately 2000 ~ 4000 mg/L.Adopt the present invention typical case 3m
3/ h triple effect stripping fractionation evaporation unit is processed, and its process strategies is: 115 ~ 120 ℃ of effects ,-0.01-+0.01 MPa, two 70 ~ 80 ℃ of effects ,-0.065 ~-0.05MPa, 55 ~ 65 ℃ of triple effects ,-0.092 ~-0.08 MPa.Processing technological flow as shown in Figure 3.TCA is wherein recycled recycle.Owing to recycling TCA, process one ton of this condensed mother liquor waste water, deduction energy consumption cost still can produce the economic benefit of 70 yuan, thereby embodiment 2 has sustainability and the enthusiasm of wastewater treatment.
Embodiment 3. is referring to accompanying drawing 1, a kind of method of sulfuric acid water separating treatment and process water recycled.TAHP (2,4,5-triamino-6 hydroxy pyrimidine vitriol) be Gu(guanine) intermediate, by DANHP (2,4-diamino-5-imino--6-hydroxy pyrimidine) hydrogenation and sulfuric acid acid out obtain, its acid out mother liquor waste water organism forms: COD 30000 mg/L, sodium sulfate 1 ~ 3%, sulfur acid PH<0.5.Adopt the present invention typical case 3m
3/ h triple effect stripping fractionation evaporation unit is processed, and its process strategies is: 118 ~ 125 ℃ of effects ,-0.03-+0.01 MPa, two 80 ~ 85 ℃ of effects ,-0.065 ~-0.05MPa, 65 ~ 70 ℃ of triple effects ,-0.088 ~-0.08 MPa.Treatment process as shown in Figure 4.Wherein, in TAHP acidified mother liquor, volatile matter is less, and minute water can directly be done process water and apply mechanically.Sulfur acid mother liquor is constantly concentrated in evaporative process, and sulfuric acid content reaches 20%.At 120 ℃, produce the COD that strong carboniogenesis has been decomposed considerable part, after separate solid, as dilute sulphuric acid, be recycled and apply mechanically, realized dilute sulphuric acid and process water recycled.
Embodiment 4. as shown in Figure 1.A kind of method of hydrochloric acid water separating treatment and process water recycled.In chemical industry is produced, in many reactions, use hydrochloric acid.Make in reaction mother liquor also with a small amount of hydrochloric acid, adopt multiple-effect stripping fractionation evaporation process of the present invention can obtain the solidifying water of steaming containing dilute hydrochloric acid, use this to steam solidifying water and make concentrated hydrochloric acid as absorption agent, can make the raw water in hydrochloric acid obtain recycled.Processing technological flow as shown in Figure 5.The water solvent products material liquid of other chemical compositions, can realize with reference to this scheme the circulation of process water in raw material.
Here it should be noted that such as YS, TP, NB etc. given in above embodiment is the code name of predetermined substance, owing to relating to secret of the trade, and is not disclosed its concrete essence.But, however, do not affect described wastewater stripping fractionation separates processing scheme and concrete description and the understanding of implementing thereof.
The present invention, through technological test repeatedly, has obtained cost efficiency, energy-conserving and environment-protective etc. significantly technical economic benefit, be that the technique of fine chemistry industry, medication chemistry industry is processed with chemical mother liquor waste water, new technical support is provided, realized original intention of the present invention.
Claims (10)
1. the method that chemical mother liquor waste water multiple-effect evaporation is processed, the chemical mother liquor waste water that contains a small amount of residue chemistry component of take is processed object, and the vaporizer that to take by steam be heating source is treatment facility, it is characterized in that, and its processing policy is:
A, described vaporizer have 2 at least, and at least one vaporizer possesses stripping fractionation effectiveness parts; Described at least 2 described vaporizers, are arranged in order and are connected in series to temperature end by low-temperature end, form thus multiple-effect evaporation and process serial equipment; And it is located at temperature end described in last in vaporizer by giving birth to steam-heated heating unit;
B, described processed object chemistry mother liquor waste water, first described vaporizer from low-temperature end enters, and the vaporizer series along described arrangement series connection flows and shifts to temperature end, and go in the same direction with the raw steam of initial heating use and the secondary steam being generated by the evaporation of processed object chemistry mother liquor waste water, thereby forming multiple-effect countercurrent evaporation processes, realize processed object chemistry mother liquor waste water, the multiple-effect evaporation under the flow direction of stripping fractionation separates;
C, described processed object chemistry mother liquor waste water, in the process with described steam move toward one another, fully contact with the described parts that possess stripping fractionation effectiveness the Gas-Liquid Contacting exchange of carrying out chemical composition, make it in vaporize water process, wherein contained chemical composition is carried out to the separated of gradual stripping and fractionated form, by each effect evaporation, obtain respectively minute lime set of enrichment chemical composition;
D, describedly by stripping fractionation separates minute lime set out, import respectively in special-purpose storage tank, at it by after processing or directly implementing to apply mechanically with the chemistry liquid that feeds intake with corresponding technique respectively, thereby realize cost efficiency, energy-conserving and environment-protective;
And described processed object chemistry mother liquor waste water, from being positioned at the top of the first vaporizer of the vaporizer described waste water upstream extremity of series, enter, by possessing stripping fractionation effectiveness parts, flow down, the secondary steam that described chemical mother liquor waste water evaporation generates under partition steam heating upwards flows, and produces thus the effect of liquid phase convective exchange; The secondary steam producing at described waste water and evaporator downstream device exists under the condition of the temperature difference, makes the heavy constituent condensation fractionation in the described wastewater streams secondary steam that vaporizer produces downstream and dissolves in described waste water; And the described waste water stripping effect produced with fully contacting of secondary steam makes again light constituent diffusion transfer in described waste water in secondary steam, finally along with secondary steam is condensed into phlegma; So each single-effect evaporator continues to carry out in proper order, process, and described phlegma provides prerequisite for technique feeds intake with applying mechanically of chemical principle feed liquid until complete the multiple-effect evaporation of described waste water.
2. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 1 is processed, is characterized in that, the number of described vaporizer, within the scope of 2 ~ 8, is imitated evaporation process thereby realize 2 ~ 8.
3. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 2 is processed, is characterized in that, the number of described vaporizer, within the scope of 2 ~ 4, is imitated evaporation process thereby realize 2 ~ 4.
4. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 3 is processed, is characterized in that, the number of described vaporizer is 3, thereby realizes 3 effect evaporation process.
5. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 1 is processed, it is characterized in that, the described parts that possess stripping fractionation effectiveness, it is the chemical filler that comprises Raschig ring, Pall ring, Xi Ta ring and ball, or comprise the Trays in Chemical Industry of sieve plate, floating valve tray and bubble plate or the tower pipe of wet-wall tower; With this, increase described waste water and steam contact area, improve stripping and fractionation effect.
6. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 1 is processed, is characterized in that, described vaporizer is corrosion-resisting evaporator; And the structure formation of described corrosion-resisting evaporator is corrosion resistant metal body or lining corrosion resistant metal body, or vitreum or lining or lass lining body, or graphite body or lining graphite body, or silicon carbide body or lining or sintered silicon carbide body, or corrosion-resistant rubber and plastic body or serve as a contrast corrosion-resistant rubber and plastic body, or its combination.
7. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 6 is processed, is characterized in that, described corrosion-resisting evaporator is that chuck heating and two-way all employing of being heated strengthen graphite evaporator prepared by graphite material.
8. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 1 is processed, is characterized in that in described vaporizer, there is certain interior pressure; And temperature is in 35 ~ 175 ℃ of interval ranges in described vaporizer, and the temperature in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams downstream last vaporizer increase one by one; And in it, be pressed in-0.10 ~+0.8Mpa interval range, and the interior pressure in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams downstream last vaporizer rise one by one; And between each vaporizer, waste water circulation is to be moved to the downstream forced conveyance of described waste liquid by liquid pump; And the waste water of each vaporizer inside conducts heat by natural flow, separate out a fixed solid in evaporating waste water process after, each vaporizer adopts liquid pump high volume circulation transport wastewater to force to conduct heat.
9. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 1 is processed, is characterized in that, before described chemical mother liquor waste water is processed, is adding medicine neutralizing treatment not, not destroy the chemical composition of chemical mother liquor.
10. the method that chemical mother liquor waste water multiple-effect evaporation according to claim 1 is processed, it is characterized in that, described phlegma of respectively imitating fractional condensation, according to its one-tenth, be grouped into and carry out classification, all or part of cover is used in the technique of chemical reaction source, as feed intake water and/or material composition of raw material, supplement and/or process water, to realize " three wastes " zero release to environment.
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