CN107311389A - A kind of coal ethyl glycol produces the processing method of waste water - Google Patents

A kind of coal ethyl glycol produces the processing method of waste water Download PDF

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Publication number
CN107311389A
CN107311389A CN201610265376.4A CN201610265376A CN107311389A CN 107311389 A CN107311389 A CN 107311389A CN 201610265376 A CN201610265376 A CN 201610265376A CN 107311389 A CN107311389 A CN 107311389A
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China
Prior art keywords
waste water
ethyl glycol
produces
processing method
stripper
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Inventor
栾金义
李海龙
程学文
高凤霞
侯秀华
万国晖
张宾
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Priority to CN201610265376.4A priority Critical patent/CN107311389A/en
Publication of CN107311389A publication Critical patent/CN107311389A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • 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
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/16—Total nitrogen (tkN-N)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/20—Total organic carbon [TOC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The present invention relates to the processing method that a kind of coal ethyl glycol produces waste water, comprise the following steps：One, coal ethyl glycol production waste water is successively with after the water outlet of stripper tower reactor and the heating of stripper overhead steam indirect heat exchange, stripping processing is carried out into stripper；Two, high-temperature S removal processing is carried out to the stripper water outlet for having adjusted pH；Three, high-temperature S removal processing water outlet enters precipitation reactor, and the pH of precipitation reactor is adjusted to 6~9, the decomposition of hydrogen peroxide is remained in the precipitation reaction of progress soluble iron and water；Four, the precipitation mixture that the 3rd step is obtained enters settlement separator and carries out gravity settling separation；Five, the supernatant obtained after gravity settling separation is subjected to A/O PROCESS FOR TREATMENTs.After coal ethyl glycol production waste water is using the inventive method processing, COD can be down to below 80mg/L, and TOC can be down to below 20mg/L total nitrogens and be down to below 25mg/L, realize the qualified discharge of waste water.

Description

A kind of coal ethyl glycol produces the processing method of waste water
Technical field
The present invention relates to a kind of processing method of organic chemical waste water, more particularly to difficult for biological degradation The processing method of organic chemical waste water, specifically a kind of coal ethyl glycol produces the place of waste water Reason method.
Background technology
Ethylene glycol is a kind of important industrial chemicals and strategic materials, is that consumption figure is maximum in the world Polyalcohol, available for manufacture polyester (can further produce terylene, beverage bottle, film), fried Medicine, glyoxal, and antifreezing agent, plasticizer, hydraulic fluid and solvent etc. can be made.
Traditional ethylene glycol production is completely dependent on oil ethene route, and cost is high.Coal ethyl glycol skill Art is then to replace oil ethylene production ethylene glycol with coal.Such technology path meet China's oil starvation, Few gas, the resources characteristic of coal resources relative abundance, are imitated with obvious economic benefit and society Benefit.
Ethylene glycol is prepared by raw material of coal at present, mainly there are three process routes：
1st, direct method：With coal gasification producing synthesis gas (CO+H2), then directly closed by synthesis gas Into ethylene glycol.The key of this technology is the selection of catalyst, considerably long in the period of in be difficult to reality Now industrialize.
2nd, olefin processes：Using coal as raw material, by obtaining synthesis gas after gasification, conversion, purification, Through methanol-fueled CLC, methanol-to-olefins (MTO) obtain ethene, then through ethylene epoxidizing, ring Oxidative ethane is hydrated and product purification, finally gives ethylene glycol.The process by coal-to-olefin with tradition Petroleum path preparing ethylene glycol is combined, and technology is more ripe, but cost is of a relatively high.
3rd, oxalic acid ester process：Using coal as raw material, pass through gasification, conversion, purification and separating-purifying After respectively obtain CO and H2, wherein CO, which is synthesized and refined by catalytic coupling, produces oxalate, Again with H2Hydrogenation reaction is carried out, and polyester grade ethylene glycol (coal ethyl glycol) is obtained by refined Process.The technological process is short, and cost is low, is current domestic attention rate highest coal second two Alcohol technology.
Using oxalate production technology, ethylene glycol product per ton is produced generation is 0.5~1.0 ton high Density wastewater, the waste water is mainly containing the pollution such as Isosorbide-5-Nitrae-dioxane (dioxanes), methanol, nitrate nitrogen Thing, with salinity is high, difficult for biological degradation the features such as, wherein Organic Pollutants in Wastewater is mainly Based on Isosorbide-5-Nitrae-dioxane (dioxanes), it is difficult to biodegradation.
Relevant coal ethyl glycol production wastewater treatment method, yet there are no related specific report at present.
The content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of coal base second The processing method of glycol production waste water, can effectively reduce COD, TOC of waste water and total The content of nitrogen, makes discharged wastewater met the national standard.
The water quality of meaning coal ethyl glycol production waste water of the invention is as follows：COD is in waste water 10000~20000mg/L, TOC are 3000~6000mg/L, total nitrogen content 1000~1500mg/L, existence form is mainly with NO3- N and NO2Based on-N.Have in waste water The organic pollutants overwhelming majority is Isosorbide-5-Nitrae-dioxane, its content 2000-7000mg/L.Waste water BOD5/CODcrLess than 0.1, it is difficult to biodegradable.
To achieve the above objectives, the present invention is adopted the technical scheme that：
A kind of coal ethyl glycol produces the processing method of waste water, comprises the following steps：
The first step, coal ethyl glycol production waste water successively with the water outlet of stripper tower reactor and stripper tower Push up after the heating of steam indirect heat exchange, stripping processing carried out into stripper,
Stripper overhead steam rich in 1,4 dioxane can be returned after indirect heat exchange is cooled down Receive or burning disposal.
The bottom temperature control of stripper is 102~110 DEG C, and the number of theoretical plate control of stripper is 5~10 pieces, the tower top discharge control of stripper is into the 10~20% of tower water.Stripper Tower top pressure control is normal pressure.
Under first step operating condition, the content of Isosorbide-5-Nitrae dioxane can in stripper tower reactor water outlet To be reduced between 1000-3500mg/L.Using steam stripped method to above-mentioned coal ethyl glycol Production waste water is handled, and can reclaim Isosorbide-5-Nitrae-dioxane of part in waste water.
Second step, the pH of stripper water outlet is adjusted to 2.0~4.5, it is therefore an objective to ensured follow-up PH conditions required for high-temperature S removal processing.Then the stripper for having adjusted pH is gone out Water carries out high-temperature S removal processing, it is therefore an objective to remaining Isosorbide-5-Nitrae-dioxy six in effective Decomposition Wastewater Ring.
High-temperature S removal processing oxidant use mass fraction for 27.5% hydrogen peroxide, it is double The consumption of oxygen water is that every liter of waste water adds 5~10ml hydrogen peroxide.
The catalyst of high-temperature S removal processing uses water-soluble inorganic molysite, and the consumption of molysite is Every liter of waste water adds 50~200mg Fe.
The temperature control of high-temperature S removal processing is 80~99 DEG C, and Stress control is normal pressure, instead Between seasonable or mean residence time control is 10~90min.
3rd step, high-temperature S removal processing water outlet enters precipitation reactor, by precipitation reactor PH adjust to 6~9, with carry out soluble iron precipitation reaction and water in remain hydrogen peroxide Decomposition.
Reaction time control is 5~30min in 3rd step, and reaction temperature control is 60~90 DEG C, Reaction pressure is normal pressure.
4th step, the precipitation mixture for then obtaining the 3rd step is weighed into settlement separator Power sedimentation separation,
The temperature control of gravity settling separation is 60~90 DEG C, and gravity settling separation time control is 30~240min.
5th step, A/O PROCESS FOR TREATMENTs are carried out by the supernatant obtained after gravity settling separation, Purpose is effective total nitrogen removed in waste water, while removing remaining COD in waste water.
The temperature control of A/O PROCESS FOR TREATMENTs is 20~35 DEG C, and the pH of A/O PROCESS FOR TREATMENTs is controlled 6.0~9.0.
After A/O PROCESS FOR TREATMENTs, COD≤80mg/L in waste water, TOC≤20mg/L, always Nitrogen≤25mg/L.
Coal ethyl glycol of the present invention produces the processing method of waste water, creative major embodiment ：1st, handled by stripping and eliminate the 1,4- dioxies that biochemical degradation is largely difficult in waste water Six rings, reduce subsequent treatment cost；2nd, oxidizing process has ensured the suitable of subsequent biochemical processing Profit is implemented.Under conditions of high temperature, high-temperature S removal processing optionally can be decomposed preferentially Isosorbide-5-Nitrae dioxane, degrades to small molecule so that the Isosorbide-5-Nitrae dioxane in waste water is broken into ring, carries High biodegradability, and as carbon source, denitrification processing is carried out beneficial to next step.3rd, lead to The addition and reaction temperature of adjustment oxidant are crossed, the depth of high-temperature S removal processing is controlled, Oxidant is set preferentially to be reacted with Isosorbide-5-Nitrae dioxane, so as to save oxidant to greatest extent Consumption, reduces processing cost.
Beneficial effects of the present invention：
The processing method of waste water is produced using coal ethyl glycol of the present invention, it is useless after processing In water, COD can be down to below 80mg/L, and TOC can be down to below 20mg/L, always Nitrogen is down to below 25mg/L, realizes the qualified discharge of waste water.
Brief description of the drawings
The present invention has drawings described below：
The schematic flow sheet of Fig. 1 present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in figure 1, coal ethyl glycol of the present invention produces the processing method of waste water, bag Include following steps：
The first step, coal ethyl glycol production waste water successively with the water outlet of stripper tower reactor and stripper tower Push up after the heating of steam indirect heat exchange, stripping processing carried out into stripper,
Stripper overhead steam rich in 1,4 dioxane can be returned after indirect heat exchange is cooled down Receive or burning disposal.
The bottom temperature control of stripper is 102~110 DEG C, and the number of theoretical plate control of stripper is 5~10 pieces, the tower top discharge control of stripper is into the 10~20% of tower water.Stripper Tower top pressure control is normal pressure.
Under first step operating condition, the content of Isosorbide-5-Nitrae dioxane can in stripper tower reactor water outlet To be reduced between 1000-3500mg/L.Using steam stripped method to above-mentioned coal ethyl glycol Production waste water is handled, and can reclaim Isosorbide-5-Nitrae-dioxane of part in waste water.
Second step, the pH of stripper water outlet is adjusted to 2.0~4.5, it is therefore an objective to ensured follow-up PH conditions required for high-temperature S removal processing.Then the stripper for having adjusted pH is gone out Water carries out high-temperature S removal processing, it is therefore an objective to remaining Isosorbide-5-Nitrae-dioxy six in effective Decomposition Wastewater Ring.
High-temperature S removal processing oxidant use mass fraction for 27.5% hydrogen peroxide, it is double The consumption of oxygen water is that every liter of waste water adds 5~10ml hydrogen peroxide.
The catalyst of high-temperature S removal processing uses water-soluble inorganic molysite, and the consumption of molysite is Every liter of waste water adds 50~200mg Fe.
The temperature control of high-temperature S removal processing is 80~99 DEG C, and Stress control is normal pressure, instead Between seasonable or mean residence time control is 10~90min.
3rd step, high-temperature S removal processing water outlet enters precipitation reactor, by precipitation reactor PH adjust to 6~9, with carry out soluble iron precipitation reaction and water in remain hydrogen peroxide Decomposition.
Reaction time control is 5~30min in 3rd step, and reaction temperature control is 60~90 DEG C, Reaction pressure is normal pressure.
4th step, the precipitation mixture for then obtaining the 3rd step is weighed into settlement separator Power sedimentation separation,
The temperature control of gravity settling separation is 60~90 DEG C, and gravity settling separation time control is 30~240min.
5th step, A/O PROCESS FOR TREATMENTs are carried out by the supernatant obtained after gravity settling separation, Purpose is effective total nitrogen removed in waste water, while removing remaining COD in waste water.
The temperature control of A/O PROCESS FOR TREATMENTs is 20~35 DEG C, and the pH of A/O PROCESS FOR TREATMENTs is controlled 6.0~9.0.
After A/O PROCESS FOR TREATMENTs, COD≤80mg/L in waste water, TOC≤20mg/L, always Nitrogen≤25mg/L.
Embodiment 1
Certain company's oxalic acid ester process glycol production waste water, pH value is that 2.0, COD is 14000 Mg/L, TOC are 4000mg/L.1,4- dioxane contents 5000mg/L.Total nitrogen content 1200mg/L。
Coal ethyl glycol production waste water enters stripper and carries out stripping processing, stripper bottom temperature Control is 106 DEG C, stripper overhead Stress control be normal pressure, stripper number of theoretical plate be 8 pieces, Stripper overhead discharge is into tower water 12%.
Next, wastewater pH is adjusted to 2.6, then the waste water for having adjusted pH is carried out high Warm catalytic oxidation treatment.Oxidant use mass fraction for 27.5% hydrogen peroxide, hydrogen peroxide Consumption is that every liter of waste water adds 6ml hydrogen peroxide.Catalyst uses molysite, and the consumption of molysite is Every liter of waste water adds 100mg Fe.The temperature control of high-temperature S removal processing is 90 DEG C, pressure Power control is that normal pressure, reaction time or mean residence time control are 60min.
Next, the pH that high-temperature S removal is handled into water outlet is adjusted to 8, to be dissolved The decomposition of hydrogen peroxide is remained in the precipitation reaction of state iron and water.This step reaction time control is 10min, reaction temperature control is 90 DEG C, and reaction pressure is normal pressure.Then by reaction effluent Gravity settling separation is carried out, the temperature control of gravity settling separation is 70 DEG C, gravitational settling point It is 60min from time control.
Next, the supernatant effluent after gravity settling separation is subjected to A/O PROCESS FOR TREATMENTs, Purpose is effective total nitrogen removed in waste water, while removing remaining COD in waste water.A/O The temperature control of processing is 30 DEG C, by adjusting wastewater pH regulation water inlet, is made in reactor PH is controlled 6.0~9.0.
Analyzed using prior art, COD is 60mg/L in waste water, and TOC is 18mg/L, Total nitrogen is 20mg/L, and Isosorbide-5-Nitrae-dioxane is not detected.Realize the qualified discharge of waste water.
Embodiment 2
Certain company's coal ethyl glycol production waste water, pH value is that 9.0, COD is 20000mg/L, TOC is 6000mg/L.Isosorbide-5-Nitrae-dioxane content 7000mg/L, total nitrogen content 1500mg/L.
Coal ethyl glycol production waste water enters stripper and carries out stripping processing, stripper bottom temperature Control is 110 DEG C, stripper overhead Stress control is that normal pressure, stripper number of theoretical plate are 10 Block, stripper overhead discharge are into tower water 20%.
Next, wastewater pH is adjusted to 4.5, then the waste water for having adjusted pH is carried out high Warm catalytic oxidation treatment.Oxidant use mass fraction for 27.5% hydrogen peroxide, hydrogen peroxide Consumption is that every liter of waste water adds 5ml hydrogen peroxide.Catalyst uses molysite, and the consumption of molysite is every Rise waste water and add 200mg Fe.The temperature control of high-temperature S removal processing is 80 DEG C, pressure Control is that normal pressure, reaction time or mean residence time control are 10min.
Next, the pH that high-temperature S removal is handled into water outlet is adjusted to 6, to be dissolved The decomposition of hydrogen peroxide is remained in the precipitation reaction of state iron and water.This step reaction time control is 5min, reaction temperature control is 80 DEG C, and reaction pressure is normal pressure.Then by reaction effluent Gravity settling separation is carried out, the temperature control of gravity settling separation is 60 DEG C, gravitational settling point It is 30min from time control.
Next, the supernatant effluent after gravity settling separation is subjected to A/O PROCESS FOR TREATMENTs, Purpose is effective total nitrogen removed in waste water, while removing remaining COD in waste water.A/O The temperature control of processing is 20 DEG C, by adjusting wastewater pH regulation water inlet, is made in reactor PH is controlled 6.0~9.0.
Analyzed using prior art, COD is 80mg/L in waste water, and TOC is 20mg/L, Total nitrogen is 25mg/L, and Isosorbide-5-Nitrae-dioxane is not detected.Realize the qualified discharge of waste water.
Embodiment 3
Certain company's coal ethyl glycol production waste water, pH value is that 1.0, COD is 10000mg/L, TOC is 3000mg/L.Isosorbide-5-Nitrae-dioxane content 2000mg/L, total nitrogen content 1000mg/L.
Coal ethyl glycol production waste water enters stripper and carries out stripping processing, stripper bottom temperature Control is 102 DEG C, stripper overhead Stress control be normal pressure, stripper number of theoretical plate be 5 pieces, Stripper overhead discharge is into tower water 10%.
Next, wastewater pH is adjusted to 2.0, then the waste water for having adjusted pH is carried out high Warm catalytic oxidation treatment.Oxidant use mass fraction for 27.5% hydrogen peroxide, hydrogen peroxide Consumption is that every liter of waste water adds 10ml hydrogen peroxide.Catalyst uses molysite, and the consumption of molysite is Every liter of waste water adds 50mg Fe.The temperature control of high-temperature S removal processing is 99 DEG C, pressure Power control is that normal pressure, reaction time or mean residence time control are 90min.
Next, the pH that high-temperature S removal is handled into water outlet is adjusted to 9, to be dissolved The decomposition of hydrogen peroxide is remained in the precipitation reaction of state iron and water.This step reaction time control is 30min, reaction temperature control is 60 DEG C, and reaction pressure is normal pressure.Then by reaction effluent Gravity settling separation is carried out, the temperature control of gravity settling separation is 90 DEG C, gravitational settling point It is 240min from time control.
Next, the supernatant effluent after gravity settling separation is subjected to A/O PROCESS FOR TREATMENTs, Purpose is effective total nitrogen removed in waste water, while removing remaining COD in waste water.A/O The temperature control of processing is 35 DEG C, by adjusting wastewater pH regulation water inlet, is made in reactor PH is controlled 6.0~9.0.
Analyzed using prior art, COD is 56mg/L in waste water, and TOC is 16mg/L, Total nitrogen is 18mg/L, and Isosorbide-5-Nitrae-dioxane is not detected.Realize the qualified discharge of waste water.
The content not being described in detail in this specification belongs to known in professional and technical personnel in the field Prior art.

Claims (19)

1. a kind of coal ethyl glycol produces the processing method of waste water, it is characterised in that including with Lower step：
The first step, coal ethyl glycol production waste water successively with the water outlet of stripper tower reactor and stripper tower Push up after the heating of steam indirect heat exchange, stripping processing is carried out into stripper；
Second step, the pH of stripper water outlet is adjusted to 2.0~4.5, then to having adjusted pH Stripper water outlet carry out high-temperature S removal processing；
3rd step, high-temperature S removal processing water outlet enters precipitation reactor, by precipitation reactor PH adjust to 6~9, carry out the precipitation reaction of soluble iron and residual hydrogen peroxide in water Decompose；
4th step, the precipitation mixture that the 3rd step is obtained enters settlement separator progress gravity and sunk Drop separation；
5th step, A/O PROCESS FOR TREATMENTs are carried out by the supernatant obtained after gravity settling separation.
2. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The bottom temperature of stripper described in the first step is 102~110 DEG C, the tower of stripper Pressure on top surface is normal pressure.
3. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The number of theoretical plate of stripper described in the first step is 5~10 pieces.
4. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The tower top discharge of stripper described in the first step is into the 10~20% of tower water.
5. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：Stripper overhead steam described in the first step it is recyclable after indirect heat exchange is cooled down or Burning disposal.
6. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：After the first step is handled through stripping in the water outlet of stripper tower reactor 1,4 dioxane content It is reduced between 1000-3500mg/L.
7. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：High-temperature S removal described in second step processing oxidant use mass fraction for 27.5% hydrogen peroxide.
8. coal ethyl glycol as claimed in claim 7 produces the processing method of waste water, it is special Levy and be：The consumption of the hydrogen peroxide be every liter of waste water in add 5~10ml hydrogen peroxide.
9. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The catalyst of the processing of high-temperature S removal described in second step uses water-soluble inorganic iron Salt.
10. coal ethyl glycol as claimed in claim 9 produces the processing method of waste water, it is special Levy and be：The consumption of the water-soluble inorganic molysite is that every liter of waste water adds 50~200mg Fe.
11. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The temperature of the processing of high-temperature S removal described in second step is 80~99 DEG C, pressure For normal pressure.
12. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The reaction time of the processing of high-temperature S removal described in second step is 10~90min.
13. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The temperature reacted described in 3rd step is 60~90 DEG C, and pressure is normal pressure.
14. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The time reacted described in 3rd step is 5~30min.
15. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The temperature of gravity settling separation described in 4th step is 60~90 DEG C.
16. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The time of gravity settling separation described in 4th step is 30~240min.
17. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The temperature of A/O PROCESS FOR TREATMENTs described in 5th step is 20~35 DEG C.
18. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：The pH of A/O PROCESS FOR TREATMENTs described in 5th step is 6.0~9.0.
19. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special Levy and be：5th step processing after effluent quality be：COD≤80mg/L, TOC≤20 Mg/L, total nitrogen≤25mg/L.
CN201610265376.4A 2016-04-26 2016-04-26 A kind of coal ethyl glycol produces the processing method of waste water Pending CN107311389A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115216342A (en) * 2021-04-14 2022-10-21 中国石油化工股份有限公司 Preparation method of polyester-grade coal-based ethylene glycol

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Application publication date: 20171103