CN108276237A - A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene - Google Patents
A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene Download PDFInfo
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- CN108276237A CN108276237A CN201711470962.3A CN201711470962A CN108276237A CN 108276237 A CN108276237 A CN 108276237A CN 201711470962 A CN201711470962 A CN 201711470962A CN 108276237 A CN108276237 A CN 108276237A
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/005—Processes comprising at least two steps in series
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
- C07C5/327—Formation of non-aromatic carbon-to-carbon double bonds only
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/10—Purification; Separation; Use of additives by extraction, i.e. purification or separation of liquid hydrocarbons with the aid of liquids
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene, water distributing can is added on dehydrogenation liquid storage tank dehydrating tube road, the sewage that water scrubber, dehydrogenated tail gas water sealed tank, dehydrogenation liquid storage tank generate enters water distributing can, sewage is sent into gun barrel by booster pump and carries out water-oil separating by water distributing can, the water phase isolated is sent into steam stripping tower, and the oil phase isolated is sent into dehydrogenation liquid storage tank.It after the present invention can be handled the produced waste water of oil refinery dry gas preparation of styrene device by stripper, is recycled, redundance is incorporated to cycle water factory, can be zero by discharge of wastewater between normal production period.
Description
Technical field
The invention belongs to styrene preparing technical fields, and in particular to a kind of clean manufacturing work of oil refinery dry gas preparation of styrene
Skill.
Background technology
Styrene is important basic organic chemical industry raw material, is set mainly as production synthetic plastic, synthetic rubber and synthesis
The raw material of fat etc..Styrene Production is more mature.There are mainly two types of commercial Applications：One is the lifes of ethylbenzene adabatic dehydrogenation method
Styrene is produced, another kind is that conjugated oxidation, that is, propylene oxide and styrene co-production method produce styrene.Two kinds of production of styrene works
Skill material ethylbenzene is mainly derived from two kinds of production technologies：One is be alkylated in gas-phase benzene using dilute ethylene in oil refinery dry gas
Shi Fanying generates ethylbenzene, and another kind is that pure ethylene reacts generation ethylbenzene when liquid phase benzene is alkylated.
Oil refinery dry gas method is prepared in styrene, and oil refinery dry gas first passes around water scrubber into device, uses fresh water wash
The oily wastewater of desulfurizing agent, generation is immediately discharged to sewerage, is delivered to sewage treatment facility；Ethylbenzene adabatic dehydrogenation technique productions
Dehydrogenated tail gas before entering heating furnace burning there are one water sealed tank, fill into fresh water as being discharged into sewerage after water seal,
Generate a part of sewage；Contain a certain amount of condensed water in the dehydrogenation liquid that gun barrel is sent outside after dehydrogenation reaction, is delivered to de-
After hydrogen liquid storage tank carries out static point of water, then it is delivered to phenyl ethylene rectification unit, can avoid causing slightly due to dehydrogenation liquid band water in this way
Styrene columns fluctuate, and the oil-containing water of dehydrogenation liquid storage tank dehydration discharge enters sewerage, causes water resource waste.Ethylbenzene is de- at present
82 DEG C of process waters of hydrogen reaction member stripper production are after the charging of crude styrene tower is heated, and a part is used as low-pressure steam drum
Moisturizing, for a winter part as workshop heating, remaining is fully incorporated circulation.
Invention content
To make up the deficiencies in the prior art, the present invention provides a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene, solution
Certainly oil refinery dry gas method prepares the sewage and moisturizing that water scrubber in styrene technique, dehydrogenated tail gas water sealed tank and dehydrogenation liquid storage tank generate
Water source, the present invention can effectively reduce sewage discharge in production process, and sewage discharge during normal production is zero, while can be reduced fresh
Water usage amount.
The present invention is achieved through the following technical solutions：
A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene, is characterized in that：On dehydrogenation liquid storage tank dehydrating tube road
Water distributing can is added, the sewage that water scrubber, dehydrogenated tail gas water sealed tank, dehydrogenation liquid storage tank generate enters water distributing can, and water distributing can passes through
Sewage is sent into gun barrel and carries out water-oil separating by booster pump, and the water phase isolated is sent into steam stripping tower, the oil isolated
Mutually it is sent into dehydrogenation liquid storage tank.
Further, it after the water phase that the gun barrel is isolated is sent into the processing of steam stripping tower, by cooling, remakes
It uses, is recycled for water scrubber and dehydrogenated tail gas water sealed tank moisturizing.
Further, after the oil phase feeding dehydrogenation liquid storage tank that the gun barrel is isolated carries out static point of water, pass through
Crude styrene tower feed exchanger exchanges heat subsequently into phenyl ethylene rectification unit.
A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene of the present invention, specific embodiment are as follows：
（1）Catalysis drying gas enters propylene absorption tower after water scrubber is washed, and absorbs C3 and the above component, and tower top purifies dry gas warp
Enter alkylation reactor after crossing purification dry gas and the heat exchange of technique water- to-water heat exchanger, bottom of tower rich absorbent is sent into parsing part；Washing
In the sewage discharge to water distributing can that tower generates；
（2）After gas-liquid separation from the products of dehydrogenation reactions after dehydrogenation reactor reaction, gas phase enters dehydrogenated tail gas absorption tower, takes off
Hydrogen tail gas absorber overhead gas burns after dehydrogenated tail gas water sealed tank into steam superheater；Dehydrogenated tail gas water sealed tank
In the sewage discharge to water distributing can of generation；
（3）After gas-liquid separation from the products of dehydrogenation reactions after dehydrogenation reactor reaction, liquid phase enters gun barrel, grease point
Water phase enters steam stripping tower after layer, and process water exchanges heat by crude styrene tower feed exchanger after steam stripping；It changes
Process water after heat drop temperature is divided into two-way, is heated all the way to purification dry gas with technique water- to-water heat exchanger by purification dry gas, separately
Condensation water pot can be directly removed all the way or recycles water factory, and winter directly goes workshop as heating；
（4）Oil phase after the layering of gun barrel grease is delivered to dehydrogenation liquid storage tank, and a small amount of oil-containing is detached at dehydrogenation liquid storage tank bottom
After sewage, oily wastewater is emitted into water distributing can, when liquid level reaches 30-50% in water distributing can, grease is pumped to by supercharging
Water-oil separating is carried out in knockout drum, into steam stripping tower, oil phase is delivered to after dehydrogenation liquid storage tank carries out static point of water water phase again, is taken off
Hydrogen liquid is delivered to the heat exchange of crude styrene tower feed exchanger through pump, subsequently into phenyl ethylene rectification unit.
Preferably, step（3）It is middle to continue to be divided into two by purification dry gas and the process water of technique water- to-water heat exchanger
Road is used as water scrubber to supplement water all the way, and another way is as dehydrogenated tail gas water sealed tank moisturizing.
Preferably, step（1）C3 and the above component are absorbed as absorbent using benzene in middle propylene absorption tower.
Preferably, step（2）In from dehydrogenation reactor reaction after products of dehydrogenation reactions first pass through air cooler and
Main cooler gas-liquid separation, gas phase are pressurized after I liquid separation of liquid separation tank into compressor, and II liquid separation of liquid separation tank is then passed through,
Gas phase enters dehydrogenated tail gas absorption tower after subcooler and deep freezer.
Further, step（3）Products of dehydrogenation reactions after the reaction of middle dehydrogenation reactor after gas-liquid separation, into grease
The liquid phase of knockout drum includes being inhaled from air cooler, main cooler, liquid separation tank I, liquid separation tank II, cooler and deep freezer and dehydrogenated tail gas
Receive the liquid phase of tower.
The beneficial effects of the invention are as follows：The present invention can by the produced waste water of oil refinery dry gas preparation of styrene device by stripper into
It after row processing, is recycled, redundance is incorporated to cycle water factory, can be zero by discharge of wastewater between normal production period, every year
30,000 tons of wastewater discharge can be reduced, while about 30,000 tons of fresh water usage amount can be reduced.
Description of the drawings
Attached drawing 1 is the process flow diagram of the present invention.
In figure, 1 water scrubber, 2 propylene absorption towers, 3 purification dry gas and technique water- to-water heat exchangers, 4 air coolers, 5 main coolers, 6 points
Flow container I, 7 compressors, 8 liquid separation tanks II, 9 coolers, 10 deep freezers, 11 dehydrogenated tail gas absorption towers, 12 dehydrogenated tail gas water sealed tanks, 13
Gun barrel, 14 coalescers, 15 steam stripping towers, 16 crude styrene tower feed exchangers, 17 water distributing cans, the storage of 18 dehydrogenation liquid
Tank.
Specific implementation mode
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, to help the skill of this field
Art personnel have more complete, accurate and deep understanding, protection scope of the present invention packet to the inventive concept of the present invention, technical solution
Following embodiment is included but is not limited to, it is any to technical scheme of the present invention under the premise of without departing from spirit and scope
Details and the modification made of form each fall in protection scope of the present invention.
A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene of the present invention, is added point on dehydrogenation liquid storage tank dehydrating tube road
Water pot, the sewage that water scrubber, dehydrogenated tail gas water sealed tank, dehydrogenation liquid storage tank generate enter water distributing can, and water distributing can passes through booster pump
Sewage is sent into gun barrel and carries out water-oil separating, the water phase isolated is sent into steam stripping tower, and the oil phase isolated is sent into
Dehydrogenation liquid storage tank；The water phase that the gun barrel is isolated is re-used as water scrubber and dehydrogenation tail after being sent into the processing of steam stripping tower
Air water sealed cans moisturizing uses, and is recycled；The oil phase that the gun barrel is isolated is sent into dehydrogenation liquid storage tank and carries out static point
After water, exchange heat subsequently into phenyl ethylene rectification unit by crude styrene tower feed exchanger.Present invention process can be reduced effectively
Sewage discharge in production process, sewage discharge during normal production is zero, while can reduce fresh water usage amount, with reference to specific
Embodiment is described in detail.
Embodiment 1
As shown in the picture, the process for cleanly preparing of the oil refinery dry gas preparation of styrene of the present embodiment, including following procedure：
Catalysis drying gas enters water scrubber 1（700-800Kpa, 25 DEG C）, propylene after compressor boost cooling is entered after washing
Absorption tower 2（1100Kpa, 10 DEG C）, after absorbing C3 and the above component as absorbent using benzene, tower top purifies dry gas by purification dry gas
Enter alkylation reactor after being heated to 50 DEG C with technique water- to-water heat exchanger 3, bottom of tower rich absorbent is delivered to analysis unit by pump
Point.
Products of dehydrogenation reactions pressure 45Kpa (a from after dehydrogenation reactor reaction）, 65 DEG C of temperature, reaction product is by empty
After cooler 4 and main cooler 5, gas phase carries out being pressurized to 75Kpa, 75 DEG C of temperature, warp into compressor 7 after I 6 liquid separation of liquid separation tank
II 8 liquid separation of excessive flow container, gas phase enter dehydrogenated tail gas absorption tower 11 through subcooler 9 and deep freezer 10（60Kpa, 10 DEG C）, take off
11 overhead gas of hydrogen tail gas absorber burns after dehydrogenated tail gas water sealed tank 12 into steam superheater.
The liquid phase come out from air cooler 4, main cooler 5, liquid separation tank I 6, liquid separation tank II 8, cooler 9 and deep freezer 10 enters
Pressure is 30Kpa（a）, temperature be 50 DEG C of gun barrel 13, water phase is delivered to poly- by pump after gun barrel 13 is layered
Device 14 is tied, subsequently into 15 pressure 52Kpa of steam stripping tower（a）, temperature is 82 DEG C, and process water increases by pump pressure after stripping
To 800kpa, temperature is 82 DEG C, and 70 DEG C are down to by 16 temperature of crude styrene tower feed exchanger.
Process water after crude styrene tower feed exchanger 16 can be divided into two-way, all the way by purification dry gas and technique
Technique coolant-temperature gage is down to 25 DEG C by water- to-water heat exchanger 3, and another way can directly remove condensation water pot or recycle water factory, and winter directly goes to factory
Room is as heating.Being cooled to 25 DEG C of process water can continue to be divided into two-way, be pressurized to 1000Kpa as water scrubber by pump all the way
1 supplement water, another way is as 12 moisturizing of dehydrogenated tail gas water sealed tank.The sewage row that water scrubber 1 and dehydrogenated tail gas water sealed tank 12 generate
It puts to water distributing can 17.
Oil phase is dehydrogenation liquid after gun barrel 13 is layered, and dehydrogenation liquid storage tank 18 is delivered to through pump, in dehydrogenation liquid storage tank 18
After bottom detaches a small amount of oily wastewater, oily wastewater is emitted into water distributing can 17, when liquid level reaches 30-50% in water distributing can 17, is led to
It crosses after pump is pressurized to 200Kpa and send to progress water-oil separating in gun barrel 13, for water phase into steam stripping tower 15, oil phase is defeated again
It send to dehydrogenation liquid storage tank 18, dehydrogenation liquid is delivered to the charging heat exchange of crude styrene tower through pump after dehydrogenation liquid storage tank 18 carries out static point of water
Device 16 exchanges heat, subsequently into phenyl ethylene rectification unit.
Discharge of wastewater between normal production period can be zero after coming into operation by the technique of the present embodiment, can reduce waste water every year
40,000 tons of discharge capacity, while 30,000 tons of fresh water usage amount can be reduced.
Claims (8)
1. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene, it is characterised in that：Increase on dehydrogenation liquid storage tank dehydrating tube road
If water distributing can, the sewage that water scrubber, dehydrogenated tail gas water sealed tank, dehydrogenation liquid storage tank generate enters water distributing can, and water distributing can passes through increasing
Sewage is sent into gun barrel and carries out water-oil separating by press pump, and the water phase isolated is sent into steam stripping tower, the oil phase isolated
It is sent into dehydrogenation liquid storage tank.
2. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to claim 1, it is characterised in that：The oil
The water phase that water separation tank is isolated is re-used as water scrubber after being sent into the processing of steam stripping tower and dehydrogenated tail gas water sealed tank moisturizing uses,
It is recycled.
3. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to claim 2, it is characterised in that：The oil
After the oil phase feeding dehydrogenation liquid storage tank that water separation tank is isolated carries out static point of water, exchange heat by crude styrene tower feed exchanger
Subsequently into phenyl ethylene rectification unit.
4. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to any one of claim 1-3, feature
It is：Specific embodiment is as follows：
（1）Catalysis drying gas enters propylene absorption tower after water scrubber is washed, and absorbs C3 and the above component, and tower top purifies dry gas warp
Enter alkylation reactor after crossing purification dry gas and the heat exchange of technique water- to-water heat exchanger, bottom of tower rich absorbent is sent into parsing part；Washing
In the sewage discharge to water distributing can that tower generates；
（2）After gas-liquid separation from the products of dehydrogenation reactions after dehydrogenation reactor reaction, gas phase enters dehydrogenated tail gas absorption tower, takes off
Hydrogen tail gas absorber overhead gas burns after dehydrogenated tail gas water sealed tank into steam superheater；Dehydrogenated tail gas water sealed tank
In the sewage discharge to water distributing can of generation；
（3）After gas-liquid separation from the products of dehydrogenation reactions after dehydrogenation reactor reaction, liquid phase enters gun barrel, grease point
Water phase enters steam stripping tower after layer, and process water exchanges heat by crude styrene tower feed exchanger after stripping；Heat exchange drop
Process water after temperature is divided into two-way, is heated all the way to purification dry gas with technique water- to-water heat exchanger by purification dry gas, another way
Condensation water pot can directly be removed or recycle water factory, winter can also directly go workshop as heating；
（4）Oil phase after the layering of gun barrel grease is delivered to dehydrogenation liquid storage tank, and in dehydrogenation liquid storage tank bottom, separation contains greasy dirt
Oily wastewater is emitted into water distributing can by water, and when liquid level reaches 30-50% in water distributing can, water-oil separating is pumped to by supercharging
Water-oil separating is carried out in tank, water phase is into steam stripping tower, and oil phase is delivered to again after dehydrogenation liquid storage tank carries out static point of water, dehydrogenation liquid
It is delivered to the heat exchange of crude styrene tower feed exchanger through pump, subsequently into phenyl ethylene rectification unit.
5. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to claim 4, it is characterised in that：Step
（3）It is middle to continue to be divided into two-way by purification dry gas and the process water of technique water- to-water heat exchanger, it is used as water scrubber to supplement water all the way, separately
It is used as dehydrogenated tail gas water sealed tank moisturizing all the way.
6. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to claim 4, it is characterised in that：Step
（1）C3 and the above component are absorbed as absorbent using benzene in middle propylene absorption tower.
7. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to claim 4, it is characterised in that：Step
（2）In from the products of dehydrogenation reactions after dehydrogenation reactor reaction first pass through air cooler and main cooler gas-liquid separation, gas phase is through excessive
It is pressurized into compressor after I liquid separation of flow container, then passes through II liquid separation of liquid separation tank, gas phase is laggard through subcooler and deep freezer
Enter dehydrogenated tail gas absorption tower.
8. a kind of process for cleanly preparing of oil refinery dry gas preparation of styrene according to claim 7, it is characterised in that：Step
（3）After gas-liquid separation, the liquid phase into gun barrel includes coming to products of dehydrogenation reactions after middle dehydrogenation reactor reaction
The liquid phase of air cooler, main cooler, liquid separation tank I, liquid separation tank II, cooler and deep freezer and dehydrogenated tail gas absorption tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711470962.3A CN108276237A (en) | 2017-12-29 | 2017-12-29 | A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene |
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| CN201711470962.3A CN108276237A (en) | 2017-12-29 | 2017-12-29 | A kind of process for cleanly preparing of oil refinery dry gas preparation of styrene |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020244639A1 (en) * | 2019-06-06 | 2020-12-10 | 中国石化工程建设有限公司 | Oil and gas processing method and device |
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Application publication date: 20180713 |