CN104150668B - The method of chemistry mother liquor waste water multiple-effect evaporation process - Google Patents
The method of chemistry mother liquor waste water multiple-effect evaporation process Download PDFInfo
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- CN104150668B CN104150668B CN201410368697.8A CN201410368697A CN104150668B CN 104150668 B CN104150668 B CN 104150668B CN 201410368697 A CN201410368697 A CN 201410368697A CN 104150668 B CN104150668 B CN 104150668B
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Abstract
The invention discloses the method for a kind of chemical mother liquor waste water multiple-effect evaporation process, have at least 2 vaporizers to be arranged in order multiple-effect evaporation process in series with it, described mother liquor waste water and vapor phase to counter-current flow, consecutive evaporation; In waste water evaporative process under the effect possessing stripping fractionation effectiveness parts, form liquid phase stripping fractionation formula and be separated, fractional condensation water by after process or direct circulation to apply mechanically etc. be principal character; Have that methodological science is reasonable, processing efficiency is high, processing cost is low, point lime set after process can fall the features such as this environmental protection in reuse technology.
Description
Technical field
The present invention relates to the method for a kind of chemical mother liquor waste water multiple-effect evaporation process, 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 got off after chemical technology synthesis Chemicals and pharmaceutical prod.
In described this kind of waste water, general all containing volatile, the perishable light constituent comprising 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 naturally discharging of the waste water of number of chemical component, beyond doubt a kind of waste of resource, and can to environment.
But, if the general biological method of described this kind of waste water is difficult to process, and the effective ways that people have been familiar with, be exactly by the water evaporates in described waste water, but the processing cost of this method is very high, evaporate 1 ton of waste water and need consumption 1 ton of steam, and 1 ton of steam to spend 300 yuan (RMB) left and right.
Because administer the important ring that chemical wastewater is protection of the environment, and chemical wastewater mainly comprehensive wastewater improvement 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 there is burning, evaporation, absorption, the effective treating methods such as high performance membrane process, but its cost is high, and with high side effect, be difficult to generally implement.How reducing costs minimizing side effect is the key implementing this kind of administering method.
Comparatively speaking, multiple-effect evaporation can solve part energy consumption problem, has certain process advantage, but steaming lime set still needs secondary treatment, and more useless residual dope more needs to make finalization process, so be not still a low cost solution.
And energy consumption saving is generally only considered in the chemical wastewater multiple-effect evaporation process of prior art, and its dosing modifier treatment before the evaporation, can destroy state of matter, and not consider separating substances and be separated the reuse of material afterwards, 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 a kind of rational technology, processing efficiency is high, processing cost is low, fall the method for a kind of chemical mother liquor waste water multiple-effect evaporation process of this environmental protection, to overcome the deficiency of prior art, meets the needs that chemical engineering industry is growing.
The present invention realizes the technical though of its object: one is adopt to be arranged in order by multiple vaporizer the multiple-effect evaporation treatment facility that series connection forms, and implements gradual consecutive evaporation process to described waste water; Two is introduced on the top of described waste water by described last vaporizer of evaporator series upstream extremity, and the steam heater that will be used for heating, be located in described vaporizer downstream end vaporizer described in last, and make the raw steam of described waste water and heating and described waste water evaporate the secondary steam generated going in the same direction, thus formation multiple effect counter current evaporates; Three is in described vaporizer, arrange parts (and described last vaporizer of wastewater streams downstream end possessing stripping and fractionation effectiveness, can within tubular heater exchhanger substitute described in possess the parts of stripping and fractionation effectiveness, described waste water flows along the inner tubal wall of interior tubular heater exchhanger, raw steam is then outer to described waste water liquid film heating at interior tubular heater exchhanger inwall), described waste water is made to possess stripping fully contact with the parts of fractionation effectiveness with described, make it while carrying out vaporize water, implement the evaporation process of stripping and fractionated form; Four is carry out classification respectively to the phlegma of each single-effect evaporator, and to feed intake applying mechanically of liquid with itself and technique, realizes the environmental protection of joint material, thus realizes object of the present invention.
Based on above technical though, the purport technical scheme that the present invention realizes its object is:
A method for chemical mother liquor waste water multiple-effect evaporation process, with the chemical mother liquor waste water containing a small amount of residue chemistry component for processed object, with the vaporizer that is heating source by steam for treatment facility, its innovative point is, 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, to be arranged in order to temperature end by low-temperature end and to be connected in series, and form multiple-effect evaporation process serial equipment thus; And it is located in temperature end vaporizer described in last by giving birth to steam-heated heating unit;
B, described processed object chemistry mother liquor waste water, enter from the first described vaporizer of low-temperature end, and shift along the evaporator series of described arrangement series connection to temperature end flowing, and with the raw steam of initial heating with evaporate by processed object chemistry mother liquor waste water the secondary steam generated and go in the same direction, thus form multiple effect counter current evaporation process, 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, with the process of described steam move toward one another, fully contact with the described parts possessing stripping fractionation effectiveness the liquid phase carrying out chemical composition to contact and exchange, make it while vaporize water process, being separated of gradual stripping and fractionated form is carried out to wherein contained chemical composition, is obtained point lime set of enrichment chemical composition by each effect evaporation respectively;
D, describedly import in special storage tank respectively by stripping fractionation separates point lime set out, after it is by process or the direct liquid that feeds intake with corresponding technique chemistry respectively implement to apply mechanically, thus realize cost efficiency, energy-conserving and environment-protective;
And described processed object chemistry mother liquor waste water, enter from the top being positioned at the first vaporizer of waste water upstream extremity described in evaporator series, flow down by possessing stripping fractionation effectiveness parts, the secondary steam that described chemical mother liquor waste water evaporation generates under partition steam heating upwards flows, and produces the effect of liquid phase convective exchange thus; Under the secondary steam produced at described waste water and downstream evaporator exists the condition of the temperature difference, make the heavy constituent condensation fractionation in the secondary steam produced to downstream evaporator by described wastewater streams and dissolve in described waste water; And described waste water and secondary steam fully contact produced stripping effect, make again light constituent diffusion transfer in described waste water in secondary steam, finally along with secondary steam is condensed into phlegma; Each single-effect evaporator like this continues to carry out in proper order, until complete the multiple-effect evaporation process of described waste water, and described phlegma provides prerequisite for technique feeds intake with applying mechanically of chemical principle feed liquid.
The above-described stripping of the present invention, is also referred to as to resolve.Refer to the exchange by phase of described steam and described warm waste water, make to be present in some chemical composition in described waste water and spontaneous liquid and produce and decompose, the material decomposed out precipitate into the physical process in vapor phase.
And some the high boiling point chemical composition be present in secondary steam, after steam is reduced by heat exchange and temperature, again can partial condensation and being dissolved in described waste water.This physical process meaning for fractionation.
Technique scheme of the present invention, is embodied in its accompanying drawing 1.
Read accompanying drawing by ginseng, and can know in conjunction with technical though of the present invention, present invention achieves the object that it will realize.
Can be understood by above given technical scheme, vaporizer of the present invention has good stripping (or claiming to resolve), fractionation usefulness.Single evaporation is improved to stripping fractionation evaporation by it; 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 advocates further is 2 ~ 4 effect evaporations.Especially the investment due to 3 effect evaporations is few, and energy consumption is more economized (being about 40% of other evaporation energy consumption), and the present invention's further preferably 3 effect evaporations.Experiment proves, this 3 effect evaporations are particularly suitable for the process of doctorization product mother liquid waste water.
And the present invention is while implementing vaporize water process to described waste water, being separated of stripping and fractionated form is carried out to chemical composition of gently boiling, the general multiple-effect evaporation that it is different from prior art adds stripping (parsing) fractionation separates function, and so-called stripping fractionation is, light constituent in the secondary steam that described waste water produces and liquid, still carry out mass transfer and heat transfer exchange, 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 (comparatively cold conditions) is to dirty, and hot gas (steam) is to upper reaches.With this understanding, increase the parts possessing and strengthen stripping fractional distillation functions, make phase due to the lifting of both contacts area, and effectively improve stripping fractionation usefulness.The described parts (or claiming chemical filler) that the present invention is selected by repeated tests are the chemical fillers comprising Raschig ring, Pall ring, western tower 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 tower pipe of the present invention's preferably wet-wall tower.
Because the present invention want the concentration of the object waste water of evaporation process high, complicated components, corrodibility is strong, in order to prevent that vaporizer and described waste water chemical reaction product are to the secondary pollution of described waste water, its working life is improved with effective, 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, 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.The present invention is actively it is recommended that graphite body or lining graphite body.And described graphite body is the graphite body 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 the complex body of anticorrosive product body described in liner that shell is metallic object.
Wherein, the present invention actively advocates, corrosion-resisting evaporator is chuck heating and the two-way full graphite evaporator all adopting enhancing graphite material to prepare that is heated.
The present invention is in its evaporation process process, according to including different boiling component (component of namely gently boiling and 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 each vaporizer of being arranged in order of the downstream of upstream in temperature, carry out layout from low to high respectively by the flow direction of described waste water to control, simultaneously in order to strengthen stripping fractionation effectiveness, interior pressure in described vaporizer, by the flow direction of described waste water, carry out layout from low to high respectively and control.The present invention advocates there is certain interior pressure in described vaporizer; And temperature is in 35 ~ 175 DEG C of interval ranges in described vaporizer, and the temperature in each vaporizer is from the first vaporizer of described influent waste water end, and to described wastewater streams, to downstream, last vaporizer increases one by one; And be pressed in-0.10 ~+0.8Mpa interval range in it, and the interior pressure in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams, to downstream, last vaporizer rises one by one; And waste water circulation is run by the downstream forced conveyance of liquid pump to described waste liquid between each vaporizer; And the waste water of each vaporizer inside is by natural flow heat transfer, after separating out a fixed solid in evaporating waste water process, it is more suitable that each vaporizer adopts liquid pump large discharge circulation transport wastewater to carry out pressure heat transfer.
Certainly, stripping of the present invention distillation evaporation process process also can down current arrangement, and namely wastewater streams is to consistent with steam flow, and when having enough negative pressure in vaporizer, described waste water can not need liquid pump to flow voluntarily operation.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, so as to make phlegma feed intake liquid for technique apply mechanically the consideration that prerequisite is provided, the present invention advocates, before described chemical mother liquor waste water process, is not adding medicine neutralizing treatment, not destroy the chemical composition of chemical mother liquor.Unless chemicals treatment does not destroy chemical constitution, or add medicament and 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; the phlegma of described each effect fractional condensation; become to be grouped into according to it and carry out classification; all or part of cover is used in the technique of chemical reaction source; supplement and/or process water as feed intake water and/or material composition of raw material, 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, handled by the phlegma that gets off 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, 7 make a living steam condensate groove, and 8 is an effect water of condensation groove, and 9 is two effect water of condensation grooves, 10 be triple effect water of condensation groove, 11 for liquid pump, 12 is stripping fractionation member segments.
Shown in figure, described waste water sprays in stripping fractionation member segments 12 to spray mode.
Visible as shown in Figure 1, it is triple effect evaporation treatment facility.
Fig. 2 is a kind of process program figure realizing effective constituent separation and water cycle and zero release of the present invention;
Fig. 3 is the process program figure of the present invention's a kind of gently boil thing separating treatment and process water recycled;
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.
A method for chemical mother liquor waste water multiple-effect evaporation process, refers to accompanying drawing 1, and it is with the chemical mother liquor waste water containing a small amount of residue chemistry component for processed object, and with the vaporizer that is heating source by steam for treatment facility, its processing policy is:
A, described vaporizer have 3, and wherein have 2 vaporizers to possess stripping fractionation effectiveness parts; Described 3 described vaporizers, to be arranged in order to temperature end by low-temperature end and to be connected in series, and form multiple-effect evaporation process serial equipment thus; And it is located in temperature end vaporizer described in last by giving birth to steam-heated heating unit;
B, described processed object chemistry mother liquor waste water, enter from the first described vaporizer of low-temperature end, and shift along the evaporator series of described arrangement series connection to temperature end flowing, and with the raw steam of initial heating with evaporate by processed object chemistry mother liquor waste water the secondary steam generated and go in the same direction, thus form multiple effect counter current evaporation process, 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, with the process of described steam move toward one another, fully contact with the described parts possessing stripping fractionation effectiveness the liquid phase carrying out chemical composition to contact and exchange, make it while vaporize water process, being separated of gradual stripping and fractionated form is carried out to wherein contained chemical composition, is obtained point lime set of enrichment chemical composition by each effect evaporation respectively;
D, describedly import in special storage tank respectively by stripping fractionation separates point lime set out, after it is by process or the direct liquid that feeds intake with corresponding technique chemistry respectively implement to apply mechanically, thus realize cost efficiency, energy-conserving and environment-protective;
And described processed object chemistry mother liquor waste water, enter from the top being positioned at the first vaporizer of waste water upstream extremity described in evaporator series, flow down by possessing stripping fractionation effectiveness parts, the secondary steam that described chemical mother liquor waste water evaporation generates under partition steam heating upwards flows, and produces the effect of liquid phase convective exchange thus; Under the secondary steam produced at described waste water and downstream evaporator exists the condition of the temperature difference, make the heavy constituent condensation fractionation in the secondary steam produced to downstream evaporator by described wastewater streams and dissolve in described waste water; And described waste water and secondary steam fully contact produced stripping effect, make again light constituent diffusion transfer in described waste water in secondary steam, finally along with secondary steam is condensed into phlegma; Each single-effect evaporator like this continues to carry out in proper order, until complete the multiple-effect evaporation process of described waste water, and described phlegma provides prerequisite for technique feeds intake with applying mechanically of chemical principle feed liquid.
And the number of described vaporizer is 3, thus realize 3 effect evaporation process.
And described in possess the parts of stripping fractionation effectiveness, be the chemical filler comprising Raschig ring, Pall ring, western tower 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; Increase the contact area of described waste water and steam with this, improve stripping and fractionation effect.The tower pipe of the present invention's preferably wet-wall tower.
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 all adopting enhancing graphite material to prepare that is heated.
And have in described vaporizer certain in pressure; And temperature is in 35 ~ 175 DEG C of interval ranges in described vaporizer, and the temperature in each vaporizer is from the first vaporizer of described influent waste water end, and to described wastewater streams, to downstream, last vaporizer increases one by one; And be pressed in-0.10 ~+0.8Mpa interval range in it, and the interior pressure in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams, to downstream, last vaporizer rises one by one; And waste water circulation is run by the downstream forced conveyance of liquid pump to described waste liquid between each vaporizer; And the waste water of each vaporizer inside is by natural flow heat transfer, after separating out a fixed solid in evaporating waste water process, each vaporizer adopts liquid pump large discharge circulation transport wastewater to carry out forced heat-exchanging.
And before described chemical mother liquor waste water process, be not adding medicine neutralizing treatment, not destroy the chemical composition of chemical mother liquor.
And the phlegma of described each effect fractional condensation, become to be grouped into and to carry out classification according to it, all or part of cover is used in the technique of chemical reaction source, supplements and/or process water as feed intake water and/or material composition of raw material, to realize " three wastes " zero release to environment.
Below the present invention further provides 4 specific embodiments, see 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 remove part light constituent after enter in 2nd effect evaporator 2 continue stripping fractionation evaporation, liquid pump forced circulation evaporation in 1st effective evaporator 3 is entered after dividing part light constituent of leaving away again, discharge to enrichment stage, ejecta can return in 1st effective evaporator 3 again and continue to concentrate after dividing solid impurity of leaving away.Steam and secondary steam trend are: raw steam is to 1st effective evaporator 3 and the heating of one effect well heater 4 chuck, the steam condensate of himself condensation, import raw steam condensate groove 7, gasified as secondary steam by the partial material waste water heated in 1st effective evaporator 3, heat 2nd effect evaporator 2, the fractional condensation water of himself condensation imports an effect water of condensation groove 8; After the effluent part 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 effluent part 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 cooling of remaining secondary steam imports triple effect water of condensation groove 10; Non-condensable gases is discharged by after vacuum cleaning system process.
Evaporating and the actual operation parameters thereof of the fractionation of typical triple effect band stripping 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 pipe
Steam capability: about 3m
3water/h
Evaporation energy consumption: 0.42T steam/T vaporize water
Operation strategy a: effect: 70 ~ 125 DEG C ,-0.03 ~+0.05MPa
Two effects: 60 ~ 85 DEG C ,-0.08 ~-0.05MPa
Triple effect: 45 ~ 70 DEG C ,-0.098 ~-0.06MPa
Stripping fractionation parts stage number: two effects, triple effect adds up to 4 ~ 6 pieces
The thing that gently boils generally distributes: triple effect: 50 ~ 60%, two effects: 25 ~ 40%, one effect: 5 ~ 10%.
Waste water starts evaporation at the first low temperature of triple effect and collects light constituent, and then improve temperature to two effects, then improve temperature to an effect, this countercurrent evaporation flow process is particularly suitable for holding labile chemical composition in priority reclamation high temperature.
From content described above, evaporation and the general multiple-effect evaporation of the fractionation of multiple-effect band stripping more also exist that other are different, one effect secondary steam injection can be increased operation rate by general multiple-effect evaporation in the raw steam of high pressure of heating, and the present invention does not adopt, because the water of condensation of raw steam can be polluted like this, expand wastewater treatment capacity.General multiple-effect evaporation often adopts simple following current to operate, and the present invention does not recommend to adopt, 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 serious by acid, brine corrosion, and the present invention adopts corrosion-resistant design, particularly adopts graphite product, and its two-way anticorrosion corrosion resistant performance greatly improves.
Point 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, not the composition such as curable liquid.
The process of chemistry mother liquor waste water is a systems engineering.Below utilize the evaporation process of multiple-effect band stripping fractionation to realize a kind of process program (see 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 reach reduce being separated of energy consumption and active substance, design proper effective constituent and process water applies mechanically scheme, can make more eurypalynous chemical mother liquor waste water effectively, low cost, green process, 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 aqueous phase 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%, COD25000mg/L, acidity PH3.Former employing neutralizing treatment is fallen TCA and is carried out multiple-effect evaporation again, and water is coagulated in the steaming producing COD about 2000 ~ 4000mg/L.Adopt the present invention typical case 3m
3the process of/h triple effect stripping fractionation evaporation unit, its process strategies is: an effect 115 ~ 120 DEG C ,-0.01-+0.01MPa, two effects 70 ~ 80 DEG C ,-0.065 ~-0.05MPa, triple effect 55 ~ 65 DEG C ,-0.092 ~-0.08MPa.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, and thus embodiment 2 has sustainability and the enthusiasm of wastewater treatment.
Embodiment 3. see 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: COD30000mg/L, sodium sulfate 1 ~ 3%, sulfur acid PH<0.5.Adopt the present invention typical case 3m
3the process of/h triple effect stripping fractionation evaporation unit, its process strategies is: an effect 118 ~ 125 DEG C ,-0.03-+0.01MPa, two effects 80 ~ 85 DEG C ,-0.065 ~-0.05MPa, triple effect 65 ~ 70 DEG C ,-0.088 ~-0.08MPa.Treatment process as shown in Figure 4.Wherein, in TAHP acidified mother liquor, volatile matter is less, and point water directly can make technique water jacket and use.Sulfur acid mother liquor constantly concentrates in evaporative process, and sulfuric acid content reaches 20%.At 120 DEG C, produce strong carboniogenesis decomposed the COD of considerable part, be recycled as dilute sulphuric acid after separate solid and apply mechanically, achieve 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 also with a small amount of hydrochloric acid in reaction mother liquor, adopt multiple-effect stripping fractionation evaporation process of the present invention can obtain coagulating water containing the steaming of dilute hydrochloric acid, use this to steam solidifying water and obtain concentrated hydrochloric acid as absorption agent, the raw water in hydrochloric acid can be made to obtain recycled.Processing technological flow as shown in Figure 5.The water solvent products material liquid of other chemical compositions, can refer to the circulation that this scheme realizes process water in raw material.
Here it should be noted that such as YS, TP, NB etc. given in above embodiment are the code name of predetermined substance, owing to relating to secret of the trade, and be not disclosed its concrete essence.But, however, do not affect description and the understanding of described wastewater stripping fractionation separates processing scheme and concrete enforcement thereof.
The present invention, through repeatedly technological test, achieves cost efficiency, and energy-conserving and environment-protective etc. are technical economic benefit, the chemical mother liquor waste water process of technique for fine chemistry industry, medication chemistry industry significantly, provides new technical support, achieves original intention of the present invention.
Claims (10)
1. a method for chemical mother liquor waste water multiple-effect evaporation process, with the chemical mother liquor waste water containing a small amount of residue chemistry component for processed object, with the vaporizer that is heating source by steam for treatment facility, it is characterized in that, 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, to be arranged in order to temperature end by low-temperature end and to be connected in series, and form multiple-effect evaporation process serial equipment thus; And it is located in temperature end vaporizer described in last by giving birth to steam-heated heating unit;
B, described processed object chemistry mother liquor waste water, enter from the first described vaporizer of low-temperature end, and shift along the evaporator series of described arrangement series connection to temperature end flowing, and with the raw steam of initial heating with evaporate by processed object chemistry mother liquor waste water the secondary steam generated and go in the same direction, thus form multiple effect counter current evaporation process, 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, with the process of described steam move toward one another, fully contact with the described parts possessing stripping fractionation effectiveness the liquid phase carrying out chemical composition to contact and exchange, make it while vaporize water process, being separated of gradual stripping and fractionated form is carried out to wherein contained chemical composition, is obtained point lime set of enrichment chemical composition by each effect evaporation respectively;
D, describedly import in special storage tank respectively by stripping fractionation separates point lime set out, after it is by process or the direct liquid that feeds intake with corresponding technique chemistry respectively implement to apply mechanically, thus realize cost efficiency, energy-conserving and environment-protective;
And described processed object chemistry mother liquor waste water, enter from the top being positioned at the first vaporizer of waste water upstream extremity described in evaporator series, flow down by possessing stripping fractionation effectiveness parts, the secondary steam that described chemical mother liquor waste water evaporation generates under partition steam heating upwards flows, and produces the effect of liquid phase convective exchange thus; Under the secondary steam produced at described waste water and downstream evaporator exists the condition of the temperature difference, make the heavy constituent condensation fractionation in the secondary steam produced to downstream evaporator by described wastewater streams and dissolve in described waste water; And described waste water and secondary steam fully contact produced stripping effect, make again light constituent diffusion transfer in described waste water in secondary steam, finally along with secondary steam is condensed into phlegma; Each single-effect evaporator like this continues to carry out in proper order, until complete the multiple-effect evaporation process of described waste water, and described phlegma provides prerequisite for technique feeds intake with applying mechanically of chemical principle feed liquid.
2. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 1 process, is characterized in that, the number of described vaporizer within the scope of 2 ~ 8, thus realizes 2 ~ 8 effect evaporation process.
3. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 2 process, is characterized in that, the number of described vaporizer within the scope of 2 ~ 4, thus realizes 2 ~ 4 effect evaporation process.
4. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 3 process, is characterized in that, the number of described vaporizer is 3, thus realizes 3 effect evaporation process.
5. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 1 process, it is characterized in that, the described parts possessing stripping fractionation effectiveness, it is the chemical filler comprising Raschig ring, Pall ring, western tower 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; Increase described waste water and steam contact area with this, improve stripping and fractionation effect.
6. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 1 process, is characterized in that, described vaporizer is corrosion-resisting evaporator; And the structure formation of described corrosion-resisting evaporator, be corrosion resistant metal body or lining corrosion resistant metal body, or vitreum or lining or lass lining body, 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 for chemical mother liquor waste water multiple-effect evaporation according to claim 6 process, is characterized in that, described corrosion-resisting evaporator is chuck heating and the two-way graphite evaporator all adopting enhancing graphite material to prepare that is heated.
8. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 1 process, is characterized in that, has certain interior pressure in described vaporizer; And temperature is in 35 ~ 175 DEG C of interval ranges in described vaporizer, and the temperature in each vaporizer is from the first vaporizer of described influent waste water end, and to described wastewater streams, to downstream, last vaporizer increases one by one; And be pressed in-0.10 ~+0.8Mpa interval range in it, and the interior pressure in each vaporizer is from the first vaporizer of described influent waste water end, to described wastewater streams, to downstream, last vaporizer rises one by one; And waste water circulation is run by the downstream forced conveyance of liquid pump to described waste liquid between each vaporizer; And the waste water of each vaporizer inside is by natural flow heat transfer, after separating out a fixed solid in evaporating waste water process, each vaporizer adopts liquid pump large discharge circulation transport wastewater to carry out pressure heat transfer.
9. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 1 process, is characterized in that, before described chemical mother liquor waste water process, is not adding medicine neutralizing treatment, not destroy the chemical composition of chemical mother liquor.
10. the method for chemical mother liquor waste water multiple-effect evaporation according to claim 1 process, it is characterized in that, the phlegma of described each effect fractional condensation, become to be grouped into according to it and carry out classification, all or part of cover is used in the technique of chemical reaction source, supplement and/or process water as feed intake water and/or material composition of raw material, to realize " three wastes " zero release to environment.
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