CN103787436B - 2-naphthol production wastewater treatment method - Google Patents
2-naphthol production wastewater treatment method Download PDFInfo
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- CN103787436B CN103787436B CN201410055962.7A CN201410055962A CN103787436B CN 103787436 B CN103787436 B CN 103787436B CN 201410055962 A CN201410055962 A CN 201410055962A CN 103787436 B CN103787436 B CN 103787436B
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Abstract
The invention discloses a 2-naphthol production wastewater treatment method. By adopting the method, 2-naphthol production wastewater is treated in an energy-saving way, 2-sodium naphthalene sulfonate and sodium sulfate in the 2-naphthol production wastewater are respectively recycled, and particularly the 2-sodium naphthalene sulfonate in the 2-naphthol production wastewater can be applied to a 2-naphthol production process as a production raw material resource, thus realizing virtuous cycle of wastewater treatment. The wastewater treatment method is characterized by comprising the steps of condensing 2-naphthol production wastewater to obtain a solid-liquid mixture containing initial mother liquor and a 2-sodium naphthalene sulfonate solid, delivering the solid-liquid mixture to a first crystal magma tank so as to separate the 2-sodium naphthalene sulfonate solid and the initial mother liquor in the solid-liquid mixture through the separation function of a first separation device, and recycling the 2-sodium naphthalene sulfonate solid, wherein the operation of condensing is implemented in a first effect evaporator; condensing the initial mother liquid in a second effect evaporator to obtain circulating mother liquor and a sodium sulfate solid, returning the circulating mother liquor to the second effect evaporator and condensing the circulating mother liquor again with the initial mother liquor.
Description
Technical field
The present invention relates to beta naphthal Wastewater Treatment, particularly a kind of beta naphthal production wastewater treatment method.
Background technology
Beta naphthal factory effluent colourity is high, COD is high, salts contg is high, cannot by traditional biochemical degradation process meet the requirement of environmental protection.In the prior art, extracting treating method is adopted to beta naphthal factory effluent, but the method energy consumption and reagent consumption huge, do not relate to the recovery respectively to wherein salt.The present inventor thinks, if can with energy-saving manner process beta naphthal factory effluent, and the 2-sodium naphthalene sulfonate reclaimed respectively in beta naphthal factory effluent and sodium sulfate, then can realize the benign cycle of wastewater treatment.Such as, the 2-sodium naphthalene sulfonate of recovery can as raw materials for production resource input in beta naphthal production process.
Summary of the invention
The present invention is directed to the defect or deficiency that exist in prior art, a kind of beta naphthal production wastewater treatment method is provided, employing the method can with energy-saving manner process beta naphthal factory effluent, reclaim the 2-sodium naphthalene sulfonate in beta naphthal factory effluent and sodium sulfate respectively, particularly 2-sodium naphthalene sulfonate wherein as raw materials for production resource input in beta naphthal production process, thus can realize the benign cycle of wastewater treatment.
Technical scheme of the present invention is as follows:
Beta naphthal production wastewater treatment method, it is characterized in that, comprise the following steps: A. utilizes the 2-sodium naphthalene sulfonate solubleness in beta naphthal factory effluent to be less than the feature of other salinities, concentrated beta naphthal factory effluent, obtain the solidliquid mixture comprising first mother liquor and 2-sodium naphthalene sulfonate solid, described 2-sodium naphthalene sulfonate solid is for preferentially separating out salinity and other salinities are still dissolved in described first mother liquor, described solidliquid mixture is sent into the first magma tank and separate 2-sodium naphthalene sulfonate solid in described solidliquid mixture and first mother liquor by the centrifugation of the first separating device, reclaim 2-sodium naphthalene sulfonate solid, described being concentrated in the first single-effect evaporator is carried out, after beta naphthal factory effluent enters the first single-effect evaporator, described beta naphthal factory effluent surface is in the negative pressure formed by vacuum pump, heat beta naphthal factory effluent by the heating steam passed in the first single-effect evaporator and produce secondary steam to boiling, by the compression of described secondary steam input vapour compressor to obtain supercharging and intensification, the secondary steam of supercharging and intensification is input to also alternative described heating steam in described first single-effect evaporator, B. described first mother liquor is input in the second single-effect evaporator and concentrates, obtain the solidliquid mixture comprising circulating mother liquor and solid sodium sulfate, described solidliquid mixture is sent into the second magma tank and separate solid sodium sulfate in described solidliquid mixture and circulating mother liquor by the centrifugation of the second separating device, reclaim(ed) sulfuric acid sodium solid, after first mother liquor enters the second single-effect evaporator, described first mother liquor surface is in the negative pressure formed by vacuum pump, be heated to the boiling of first mother liquor by the heating steam in the second single-effect evaporator again and produce secondary steam, by the compression of described secondary steam input vapour compressor to obtain supercharging and intensification, the secondary steam of supercharging and intensification is input to also alternative described heating steam in described second single-effect evaporator, C. described circulating mother liquor turns back in the second single-effect evaporator and again concentrates together with described first mother liquor.
Described first separating device and the second separating device include whizzer.
In steps A, described solidliquid mixture before separation, carries out cooling process, makes the 2-sodium naphthalene sulfonate solid in described solidliquid mixture increase the rate of recovery because of further crystallization.
Described heating steam >=120 DEG C.
As the water of condensation that the secondary steam of heating steam is formed after heat exchange condensation, its COD≤500mg/L.
Initial temperature >=90 DEG C of described water of condensation, are inputted after preheating material system carries out preheating to material and are directly exported to sewage work.
Salinity weight content in described beta naphthal factory effluent is 8 ~ 12%, and wherein the weight content of 2-sodium naphthalene sulfonate is 1.5 ~ 3%.
Content meter is all >=95% by weight for the 2-sodium naphthalene sulfonate solid purity separated.
The salinity weight content of the initial mother liquor separated is 16 ~ 25%.
In described cooling process, by initial mother liquor temperature from≤95 DEG C be down to≤38 DEG C.
The salinity weight content of the circulating mother liquor separated is 28 ~ 34%.
Technique effect of the present invention is as follows: beta naphthal production wastewater treatment method of the present invention is to utilize the energy-saving manner of secondary steam continuously fully, the 2-sodium naphthalene sulfonate in beta naphthal factory effluent and sodium sulfate can be reclaimed respectively, particularly 2-sodium naphthalene sulfonate wherein can, as raw materials for production resource input in beta naphthal production process, make beta naphthal production wastewater treatment enter the benign cycle producing real economy benefit.
Utilize negative pressure, effectively can reduce the boiling point of beta naphthal factory effluent.Vacuum tightness is higher, and the boiling point of general beta naphthal factory effluent is lower, advantageously in utilizing heating steam and/or the secondary steam as heating steam safely and efficiently.As the secondary steam of heating steam, the purifying treatment in early stage to beta naphthal factory effluent on the one hand, COD≤the 500mg/L of its water of condensation, the heat of secondary steam is used to again in the generation of follow-up secondary steam on the other hand, fresh heating steam is consumed few, general only for unloading phase, the operation phase only needs supplementing of minute quantity.
Embodiment
Below in conjunction with embodiment, the present invention will be described.
Embodiment 1: user beta naphthal product production capacity being reached to more than ten thousand tons, implement beta naphthal production wastewater treatment method of the present invention, the 2-sodium naphthalene sulfonate 3 ~ 4 tons of higher degree can be obtained every day from factory effluent, be back to beta naphthal to produce, be equivalent to the income realizing more than 20,000 yuan every day; Every day can obtain a large amount of sodium sulfate from factory effluent, about 12 tons, and annual take-away can obtain 600,000 yuan, and equipment of can offsetting completely runs, artificial and necessary maintenance cost.
2-sodium naphthalene sulfonate is pale white crystals or powder, water-soluble, is insoluble to alcohol, and its purposes comprises for organic synthesis or the emulsifying agent etc. being used as gelatin.Salinity gross weight content in beta naphthal factory effluent is at about 10-15%, 2-naphthalene sulfonate salt weight content 1.5 ~ 2.5%, and the weight content of sodium sulfate and a small amount of S-WAT sum is at about 8.5-12.5%%.The solubleness of 2-sodium naphthalene sulfonate in water is about 3%, and less with fluctuating temperature.Sodium sulfate is soluble in water, and the solubleness in 20 DEG C of water is at about 20g/100ml, and the solubleness in 30 DEG C of water is at about 40g/100ml.Due to the solubleness of 2-sodium naphthalene sulfonate in water much smaller than sodium sulfate and S-WAT the solubleness in water, therefore when 2-sodium naphthalene sulfonate from beta naphthal factory effluent concentrated precipitation time, such as a large amount of precipitation 2-sodium naphthalene sulfonate under the temperature condition of 32 ~ 35 DEG C, sodium sulfate and S-WAT can not be separated out.
Beta naphthal production wastewater treatment method, comprise the following steps: A. utilizes the 2-sodium naphthalene sulfonate solubleness in beta naphthal factory effluent to be less than the feature of other salinities, concentrated beta naphthal factory effluent, obtain the solidliquid mixture comprising first mother liquor and 2-sodium naphthalene sulfonate solid, described 2-sodium naphthalene sulfonate solid is for preferentially separating out salinity and other salinities are still dissolved in described first mother liquor, described solidliquid mixture is sent into the first magma tank and separate 2-sodium naphthalene sulfonate solid in described solidliquid mixture and first mother liquor by the centrifugation of the first separating device, reclaim 2-sodium naphthalene sulfonate solid, described being concentrated in the first single-effect evaporator is carried out, after beta naphthal factory effluent enters the first single-effect evaporator, described beta naphthal factory effluent surface is in the negative pressure formed by vacuum pump, heat beta naphthal factory effluent by the heating steam passed in the first single-effect evaporator and produce secondary steam to boiling, by the compression of described secondary steam input vapour compressor to obtain supercharging and intensification, the secondary steam of supercharging and intensification is input to also alternative described heating steam in described first single-effect evaporator, B. described first mother liquor is input in the second single-effect evaporator and concentrates, obtain the solidliquid mixture comprising circulating mother liquor and solid sodium sulfate, described solidliquid mixture is sent into the second magma tank and separate solid sodium sulfate in described solidliquid mixture and circulating mother liquor by the centrifugation of the second separating device, reclaim(ed) sulfuric acid sodium solid, after first mother liquor enters the second single-effect evaporator, described first mother liquor surface is in the negative pressure formed by vacuum pump, be heated to the boiling of first mother liquor by the heating steam in the second single-effect evaporator again and produce secondary steam, by the compression of described secondary steam input vapour compressor to obtain supercharging and intensification, the secondary steam of supercharging and intensification is input to also alternative described heating steam in described second single-effect evaporator, C. described circulating mother liquor turns back in the second single-effect evaporator and again concentrates together with described first mother liquor.Described first separating device and the second separating device include whizzer.In steps A, described solidliquid mixture before separation, carries out cooling process, the 2-sodium naphthalene sulfonate solid in described solidliquid mixture is increased because of further crystallization.Described heating steam >=120 DEG C.As the water of condensation that the secondary steam of heating steam is formed after heat exchange condensation, its COD≤500mg/L.Initial temperature >=90 DEG C of described water of condensation, are inputted after preheating material system carries out preheating to material and are directly exported to sewage work.Salinity weight content in described beta naphthal factory effluent is 8 ~ 12%, and wherein the weight content of 2-sodium naphthalene sulfonate is 1.5 ~ 3%.Content meter is all >=95% by weight for the 2-sodium naphthalene sulfonate solid purity separated.The salinity weight content of the initial mother liquor separated is 16 ~ 25%.In described cooling process, by initial mother liquor temperature from≤95 DEG C be down to≤38 DEG C.The salinity weight content of the circulating mother liquor separated is 28 ~ 34%.
Herein means bright, more than describe and contribute to those skilled in the art and understand the invention, but and the protection domain of unrestricted the invention.Any enforcement improving the equivalent replacement described above, modification and/or delete numerous conforming to the principle of simplicity and carry out not departing from the invention flesh and blood, all falls into the protection domain of the invention.
Claims (11)
1. a beta naphthal production wastewater treatment method, it is characterized in that, comprise the following steps: A. utilizes the 2-sodium naphthalene sulfonate solubleness in beta naphthal factory effluent to be less than the feature of other salinities, concentrated beta naphthal factory effluent, obtain the solidliquid mixture comprising first mother liquor and 2-sodium naphthalene sulfonate solid, described 2-sodium naphthalene sulfonate solid is for preferentially separating out salinity and other salinities are still dissolved in described first mother liquor, described solidliquid mixture is sent into the first magma tank and separate 2-sodium naphthalene sulfonate solid in described solidliquid mixture and first mother liquor by the centrifugation of the first separating device, reclaim 2-sodium naphthalene sulfonate solid, described being concentrated in the first single-effect evaporator is carried out, after beta naphthal factory effluent enters the first single-effect evaporator, described beta naphthal factory effluent surface is in the negative pressure formed by vacuum pump, heat beta naphthal factory effluent by the heating steam passed in the first single-effect evaporator and produce secondary steam to boiling, by the compression of described secondary steam input vapour compressor to obtain supercharging and intensification, the secondary steam of supercharging and intensification is input to also alternative described heating steam in described first single-effect evaporator, B. described first mother liquor is input in the second single-effect evaporator and concentrates, obtain the solidliquid mixture comprising circulating mother liquor and solid sodium sulfate, described solidliquid mixture is sent into the second magma tank and separate solid sodium sulfate in described solidliquid mixture and circulating mother liquor by the centrifugation of the second separating device, reclaim(ed) sulfuric acid sodium solid, after first mother liquor enters the second single-effect evaporator, described first mother liquor surface is in the negative pressure formed by vacuum pump, be heated to the boiling of first mother liquor by the heating steam in the second single-effect evaporator again and produce secondary steam, by the compression of described secondary steam input vapour compressor to obtain supercharging and intensification, the secondary steam of supercharging and intensification is input to also alternative described heating steam in described second single-effect evaporator, C. described circulating mother liquor turns back in the second single-effect evaporator and again concentrates together with described first mother liquor.
2. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, described first separating device and the second separating device include whizzer.
3. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, in steps A, described solidliquid mixture before separation, carries out cooling process, makes the further crystallization of 2-sodium naphthalene sulfonate solid in described solidliquid mixture.
4. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, equal with the heating steam in described second single-effect evaporator in described first single-effect evaporator >=120 DEG C.
5. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, as the water of condensation that the secondary steam of heating steam is formed after heat exchange condensation in described first single-effect evaporator and in described second single-effect evaporator, its COD all≤500mg/L.
6. beta naphthal production wastewater treatment method according to claim 5, is characterized in that, temperature >=90 DEG C of described water of condensation, is inputted after preheating material system carries out preheating to material and directly exports sewage work to.
7. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, the salinity weight content in described beta naphthal factory effluent is 8 ~ 12%, and wherein the weight content of 2-sodium naphthalene sulfonate is 1.5 ~ 3%.
8. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, content meter is all >=95% by weight for the 2-sodium naphthalene sulfonate solid purity separated.
9. beta naphthal production wastewater treatment method according to claim 1, is characterized in that, the salinity weight content of the initial mother liquor separated is 16 ~ 25%.
10. beta naphthal production wastewater treatment method according to claim 3, is characterized in that, in described cooling process, by initial mother liquor temperature from≤95 DEG C be down to≤38 DEG C.
11. beta naphthal production wastewater treatment methods according to claim 1, is characterized in that, the salinity weight content of the circulating mother liquor separated is 28 ~ 34%.
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| CN104355475B (en) * | 2014-11-13 | 2016-02-24 | 湖北华巳新能源环保工程有限公司 | A kind for the treatment of process of G salt mother liquor |
| CN105366746A (en) * | 2015-11-10 | 2016-03-02 | 唐山宝翔化工产品有限公司 | 2-naphthol wastewater processing technology |
| CN109942377B (en) * | 2019-04-11 | 2022-04-15 | 孙骜 | Process for recycling mother liquor wastewater in naphthol production |
| CN111573943A (en) * | 2020-03-22 | 2020-08-25 | 萧县沃德化工科技有限公司 | Comprehensive treatment technology for 2-naphthol production wastewater |
| CN115433110A (en) * | 2022-08-30 | 2022-12-06 | 安徽生源化工有限公司 | Method for preparing 2, 7-sodium naphthalenedisulfonate by recycling naphthol-containing wastewater |
| CN115557630B (en) * | 2022-09-14 | 2024-04-30 | 昆明理工大学 | Process for treating 2-naphthol production wastewater by utilizing red mud |
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| CN1769191A (en) * | 2005-09-05 | 2006-05-10 | 暨南大学 | Bentonite base composite material for water treatment and its preparation method |
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| JP5047957B2 (en) * | 2005-06-23 | 2012-10-10 | ビーエーエスエフ ソシエタス・ヨーロピア | Leather manufacturing method |
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| JPH0547957A (en) * | 1991-08-08 | 1993-02-26 | Fujitsu Ltd | Semiconductor device |
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| JP5047957B2 (en) * | 2005-06-23 | 2012-10-10 | ビーエーエスエフ ソシエタス・ヨーロピア | Leather manufacturing method |
| CN1769191A (en) * | 2005-09-05 | 2006-05-10 | 暨南大学 | Bentonite base composite material for water treatment and its preparation method |
| CN1858010A (en) * | 2006-04-17 | 2006-11-08 | 李阳 | Processing method for mother solution and solium sulfite solution in naphthol production |
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Address after: 100071 room 801, 8th floor, building 2, yard 8, Automobile Museum West Road, Fengtai District, Beijing Patentee after: SINOCHEM ENVIRONMENTAL HOLDINGS Ltd. Address before: 21 / F, Sinochem building, A2 Fuxingmenwai street, Xicheng District, Beijing 100045 Patentee before: SINOCHEM ENERGY SAVING ENVIRONMENTAL PROTECTION HOLDING (BEIJING) Co.,Ltd. |
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