CN104556518A - Method and device for recycling and treating NPG production process wastewater - Google Patents
Method and device for recycling and treating NPG production process wastewater Download PDFInfo
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- CN104556518A CN104556518A CN201410809853.XA CN201410809853A CN104556518A CN 104556518 A CN104556518 A CN 104556518A CN 201410809853 A CN201410809853 A CN 201410809853A CN 104556518 A CN104556518 A CN 104556518A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
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Abstract
The invention relates to a method for recycling and treating an NPG production process wastewater. The method comprises the following steps: a, feeding process wastewater in NPG production to a methanol distillation tower, circularly heating and distilling at 85-95 DEG C; distilling and condensing partial methanol to a methanol receiving tank; b, feeding the wastewater from the distillation tower to a stripping tower to spray downwards, carrying out blast countercurrent contact in the tower, blowing and removing formaldehyde in the wastewater, wherein the water temperature of the spray wastewater is 75-80 DEG C, the blast volume is 100-150sq/c; the COD of the wastewater is within 2,000mg/L; and the formaldehyde concentration is less than 20mg/L; c, discharging the treated wastewater into a stirring tank, dropwise adding a catalyst and 27.5% of hydrogen peroxide to react at 60-70 DEG C; and d, cooling the treated wastewater to 20-25DEG C, and returning to a production system to use. The method has the advantages that the wastewater in the complete set of NPG production can be fully recycled; the wastewater treatment cost is reduced; and the cost of a neopentyl glycol material is reduced.
Description
Technical field:
The present invention relates to NPG production method, particularly in NPG production, processing wastewater is recycled treatment process and is realized the device of the method.
Background technology:
Neopentyl glycol (formal name used at school 2,2---dimethyl-1,3-propylene glycol, is called for short NPG) and being mainly used in the production of high-grade Synolac, its consumption accounts for 75% of aggregate consumption; In addition for lubricating oil, softening agent, polyester polyol, fire retardant, medicine and agricultural chemicals etc.
NPG suitability for industrialized production route has two, i.e. halo propyl alcohol route and isobutyric aldehyde route, industrial production NPG adopts isobutyric aldehyde route substantially both at home and abroad at present, namely with isobutyric aldehyde, formaldehyde for starting raw material, do catalyzer Cuiization Shrink symphysis through alkali and become intermediate 2,2-dimethyl-3-hydroxy propanal (be commonly called as hydroxy pivalin aldehyde, be called for short HPA), restores and generates NPG.The method be reduced because of HPA has formaldehyde disproportionation and shortening, therefore technique is divided again discrimination method and hydrogenation method two kinds.
In disproportionation processes, general total process yield is about 74%, due in technique because a large amount of water brought into by raw material, and need time refining to carry out washing separating formic sodium with water to extraction liquid, therefore produce a large amount of waste water, containing raw materials for production aldehyde, alcohols material in this factory effluent, belong to the Organic factory effluent of high density, difficult for biological degradation.
Usually the biological treatment adopting anaerobic biological treatment to be combined with Aerobic biological process for high concentrated organic wastewater at present.But its activity of carrying out a biological disposal upon affects comparatively large by the concentration that formaldehyde is initial, it is generally acknowledged, the biological treatment poisonous substance permissible concentration of formaldehyde is 100-150mg/L.
Neopentyl glycol industrial wastewater belongs to high concentrated organic wastewater, the objectionable impurities alcohol containing high density, aldehyde material, not readily biodegradable, cannot the directly biological treatment that is combined with Aerobic biological process of anaerobic biological treatment.
Summary of the invention:
Object of the present invention is exactly the harmful organic substance in order to effectively reduce alcohol, aldehydes in NPG factory effluent, reduce factory effluent quantity discharged, reduce cost for wastewater treatment, improve the problem of comprehensive utilization, in the NPG production of proposition, processing wastewater recycles treatment process and device.
To achieve these goals, the technical solution used in the present invention is as follows:
During a kind of NPG produces, processing wastewater recycles treatment process, and its feature comprises the steps:
A, by NPG produce in processing wastewater enter methanol rectifying tower by preheater preheats, utilize well heater circulating-heating rectifying effluent part, control rectifying tower temperature to 85-95 DEG C, methanol rectification a small amount of in waste water, condensation are recycled in groove, go back to formaldehyde workshop and use;
B, the waste water after rectifying tower process is delivered to gas stripping column top spray downwards, by gas blower from middle part to air blast in tower, spent shower water counter current contact downward with tower top, stripping removal is carried out to formaldehyde most of in waste water, in tower, spent shower water water temperature controls 75-80 DEG C, blast volume controls at 100-150 sides/S, and by waste water COD processing controls within 2000mg/L, the concentration of formaldehyde in waste water drops to 20 below mg/L;
Waste water in c, gas stripping column after stripping drains in steel basin, drip in steel basin simultaneously a kind of catalyzer and 27.5% hydrogen peroxide carry out stirring reaction, reaction water temperature control at 60-70 DEG C, stirring reaction 1 hours.It reacts because the active ingredient on catalyzer promotes that the free free radical (HO etc.) with strong oxidizing property is produced in the decomposition reaction of hydrogen peroxide, first the free free radical of strong oxidizing property reacts with formaldehyde or other organism of easily degrading produces HCOOH and other products, under the effect of free free radical, then continues reaction generate CO2 and H2O;
D, drip catalyzer and 27.5% hydrogen peroxide after, sampling of wastewater about Analysis for CO D:2000mg/L after steel basin process, within formaldehyde in waste water concentration 3-5mg/L, containing a small amount of organism in waste water, processed waste water changes cooling water temperature to 20-25 DEG C through plate, returns production system and recycles.Accumulated by knowhow, the waste water retrieval system after the method process uses, and does not affect raw materials for production consumption and quality product.
Catalyzer described in step c is by porous inorganic oxide carrier gac, join in the metal acetate solutions of massfraction about 5% that (metal is the one in copper, manganese, iron, silver, by incipient impregnation 2h, then dry at a constant temperature, by high-temperature roasting.
Present invention also offers processing wastewater in NPG production and recycle treatment unit, its feature comprises:
A, a methanol rectifying tower, methanol rectifying tower (2) is connected with preheater by pipeline, and methanol rectification column overhead is connected with condenser, and condenser is connected with methyl alcohol groove;
B, methanol rectification tower bottom are connected with recycle pump by pipeline, and recycle pump is connected with well heater and gas stripping column respectively by pipeline, and well heater is connected with methanol rectifying tower by pipeline;
Be connected with gas blower in the middle part of c, gas stripping column, be connected bottom gas stripping column by pipeline with steel basin, steel basin is connected with force (forcing) pump, and force (forcing) pump changes with plate and is connected, and plate changes and is connected with production system.
The present invention is the organic high strength wastewater utilizing reduced pressure distillation technique neopentyl glycol to be produced, by underpressure distillation, alcohol rectifying in waste water is reclaimed, the waste water reclaimed after alcohol delivers to gas stripping column full gear, the effect considering rectifying and the waste heat effect that can provide, the circulating-heating principle that make use of rectifying tower is had to improve rectification effect, reduce the method to the consumption of electric energy, the waste water after full gear returns production systemic circulation and uses.
The invention has the advantages that:
1. the methyl alcohol reclaimed can go back to formaldehyde workshop and use as raw material; 2. effectively utilize the steam waste heat in this workshop or other workshops, reduce the harm that waste heat causes for climatope, avoid the waste of steam energy consumption; 3. return production systemic circulation after the cooling of factory effluent major part after process to use, decrease the quantity discharged of factory effluent, greatly reduce wastewater treatment expense, reduce the destruction to ecotope simultaneously.
Accompanying drawing illustrates:
Fig. 1 the invention provides processing wastewater in NPG production to recycle treatment unit schematic diagram.
Embodiment:
As shown in Figure 1, during the NPG that the present invention adopts produces, processing wastewater recycles the composed as follows for the treatment of unit:
A, a methanol rectifying tower 2, methanol rectifying tower 2 is connected with preheater 1 by pipeline, and methanol rectifying tower 2 tower top is connected with condenser 3, and condenser 3 is connected with methyl alcohol groove 4;
Be connected with recycle pump 6 by pipeline bottom b, methanol rectifying tower 2, recycle pump 6 is connected with well heater 5 and gas stripping column 7 respectively by pipeline, and well heater 5 is connected with methanol rectifying tower 2 by pipeline;
Be connected with gas blower 8 in the middle part of c, gas stripping column 7, be connected bottom gas stripping column 7 by pipeline with steel basin 9, steel basin 9 is connected with force (forcing) pump 10, and force (forcing) pump 10 and plate change 11 and be connected, and plate changes 11 and is connected with production system 12.
As shown in Figure 1, a kind of NPG production technique waste water reclamation provided by the invention utilizes treatment process, comprises the following steps:
A, by NPG produce in processing wastewater enter methanol rectifying tower by preheater preheats, utilize well heater circulating-heating rectifying effluent part, control rectifying tower temperature to 85-95 DEG C, methanol rectification a small amount of in waste water, condensation are recycled in groove, go back to formaldehyde workshop and use;
B, rectifying tower processed waste water is delivered in gas stripping column from top, by gas blower from middle part to air blast in tower, spent shower water counter current contact downward with tower top, stripping removal is carried out to formaldehyde most of in waste water, in tower, spent shower water water temperature controls 75-80 DEG C, blast volume controls at 100-150 sides/S, and by waste water COD processing controls within 2000mg/L, the concentration of formaldehyde in waste water drops to 20 below mg/L;
Waste water in c, gas stripping column after stripping drains in steel basin, drip in steel basin simultaneously catalyzer and 27.5% hydrogen peroxide carry out stirring reaction, reaction water temperature control at 60-70 DEG C, stirring reaction 1 hours.It reacts because the active ingredient on catalyzer promotes that the free free radical (HO etc.) with strong oxidizing property is produced in the decomposition reaction of hydrogen peroxide, first the free free radical of strong oxidizing property reacts with formaldehyde or other organism of easily degrading produces HCOOH and other products, under the effect of free free radical, then continues reaction generate CO2 and H2O;
Described catalyzer is by porous inorganic oxide carrier gac, join (metal is the one in copper, manganese, iron, silver) in the metal acetate solutions of massfraction about 5% and flood 2h, gac and metal acetate solutions press equal-volume configuration, then dry at a constant temperature, made by 400 DEG C of-600 DEG C of high-temperature roastings.
Sampling of wastewater about Analysis for CO D:2000mg/L after d, steel basin process, within formaldehyde in waste water concentration 3-5mg/L, containing a small amount of organism in waste water, processed waste water changes cooling water temperature to 20-25 DEG C through plate, returns production system and recycles.
Claims (2)
1. in NPG production, processing wastewater recycles a treatment process, and its feature comprises the steps:
A, by NPG produce in processing wastewater enter methanol rectifying tower by preheater preheats, utilize recycle pump and well heater circulating-heating rectifying effluent part, control rectifying tower temperature to 85-95 DEG C, in waste water, part methyl alcohol is distillated, condensation is recycled in methyl alcohol groove, returns to formaldehyde workshop and uses;
B, the waste water after rectifying tower process is delivered to gas stripping column top spray downwards, by gas blower from middle part to air blast in tower, the waste water counter current contact sprayed downwards with tower top, stripping removal is carried out to the part formaldehyde in waste water, in tower, spent shower water water temperature controls 75-80 DEG C, blast volume controls at 100-150 sides/S, and by waste water COD processing controls within 2000mg/L, the concentration of formaldehyde in waste water drops to 20 below mg/L;
Waste water in c, gas stripping column after stripping drains in steel basin, drip in steel basin simultaneously a kind of catalyzer and 27.5% hydrogen peroxide carry out stirring reaction, reaction water temperature control at 60-70 DEG C, stirring reaction 1 hour; Described catalyzer is by porous inorganic oxide carrier gac, join in the metal acetate solutions of massfraction about 5% and flood 2h, gac and metal acetate solutions press equal-volume configuration, then dry at a constant temperature, are made by 400 DEG C of-600 DEG C of high-temperature roastings;
D, drip catalyzer and 27.5% hydrogen peroxide after, within sampling of wastewater Analysis for CO D:2000mg/L after steel basin process, formaldehyde in waste water concentration 3-5mg/L, changes cooling water temperature to 20-25 DEG C by processed waste water through plate, returns production system and recycles.
2. in NPG production, processing wastewater recycles a treatment unit, and its feature comprises:
A, a methanol rectifying tower (2), methanol rectifying tower (2) is connected with preheater (1) by pipeline, and methanol rectifying tower (2) tower top is connected with condenser (3), and condenser (3) is connected with methyl alcohol groove (4);
B, methanol rectifying tower (2) bottom is connected with recycle pump (6) by pipeline, and recycle pump (6) is connected with well heater (5) and gas stripping column (7) respectively by pipeline, and well heater (5) is connected with methanol rectifying tower (2) by pipeline;
C, gas stripping column (7) middle part is connected with gas blower (8), gas stripping column (7) bottom is connected with steel basin (9) by pipeline, steel basin (9) is connected with force (forcing) pump (10), and force (forcing) pump (10) changes (11) and is connected with plate, and plate changes (11) is connected with production system (12).
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| CN201410809853.XA CN104556518B (en) | 2014-12-24 | 2014-12-24 | NPG production technology waste water reclamation utilizes processing method and device |
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| CN201410809853.XA CN104556518B (en) | 2014-12-24 | 2014-12-24 | NPG production technology waste water reclamation utilizes processing method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106242149A (en) * | 2016-08-31 | 2016-12-21 | 惠州市惠阳区力行环保有限公司 | The processing method of useless stripper |
| CN106560449A (en) * | 2016-03-16 | 2017-04-12 | 中科鼎实环境工程有限公司 | Thermal desorption spraying tower circulation spraying wastewater treatment, cooling and reuse system |
| CN109592830A (en) * | 2018-12-12 | 2019-04-09 | 湖南海利常德农药化工有限公司 | A kind of processing system and its processing method of the waste water containing solvent |
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| US20110144397A1 (en) * | 2009-12-15 | 2011-06-16 | Van Egmond Cornelis F | Method for contaminants removal in the olefin production process |
| CN103420531A (en) * | 2012-05-16 | 2013-12-04 | 中国石油化工股份有限公司 | Comprehensive treatment method of wastewater of acrylonitrile production process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106560449A (en) * | 2016-03-16 | 2017-04-12 | 中科鼎实环境工程有限公司 | Thermal desorption spraying tower circulation spraying wastewater treatment, cooling and reuse system |
| CN106242149A (en) * | 2016-08-31 | 2016-12-21 | 惠州市惠阳区力行环保有限公司 | The processing method of useless stripper |
| CN106242149B (en) * | 2016-08-31 | 2019-11-08 | 惠州市惠阳区力行环保有限公司 | The processing method of useless stripper |
| CN109592830A (en) * | 2018-12-12 | 2019-04-09 | 湖南海利常德农药化工有限公司 | A kind of processing system and its processing method of the waste water containing solvent |
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| CN104556518B (en) | 2016-07-06 |
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