CN103805225B - Liquefied petroleum gas waste soda residue degassing method - Google Patents
Liquefied petroleum gas waste soda residue degassing method Download PDFInfo
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- CN103805225B CN103805225B CN201310492221.0A CN201310492221A CN103805225B CN 103805225 B CN103805225 B CN 103805225B CN 201310492221 A CN201310492221 A CN 201310492221A CN 103805225 B CN103805225 B CN 103805225B
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Abstract
The present invention relates to a kind of liquefied petroleum gas waste soda residue degassing method, mainly solve prior art exists environmental pollution, the problem of waste gas waste.The present invention is by using a kind of liquefied petroleum gas waste soda residue degassing method, first-selected contact in caustic wash tower with alkali lye by liquefied petroleum gas obtains effluent (1), it is then out thing (1) and enters settling tank sedimentation separation, gas phase is discharged from settling tank top, the alkali lye of the hydrocarbon containing liquid bottom settling tank enters the degassing of alkaline residue degassing tank, the hydrocarbon component that alkaline residue degassing tank top obtains enters low pressure gas pipe network, and the alkaline residue obtained bottom alkaline residue degassing tank is delivered to aftertreatment device；Wherein, the operating condition of described alkaline residue degassing tank is: pressure is calculated as 0.08MPa to normal pressure with gauge pressure, and temperature is that the technical scheme more than 0 DEG C to 95 DEG C preferably solves the problems referred to above, can be used in the degassing of liquefied petroleum gas waste soda residue.
Description
Technical field
The present invention relates to a kind of liquefied petroleum gas waste soda residue degassing method.
Technical background
The important source material that liquefied petroleum gas (abbreviation liquid hydrocarbon) is fine chemistry industry that oil plant produces, wherein typically contains certain
The sulfide of quantity, it is necessary to use or storage request according to downstream process units, is removed by the method for chemistry or absorption.
Major Sulfides in liquid hydrocarbon is hydrogen sulfide and mercaptan, and conventional technique uses liquid hydrocarbon mercaptan removal technique, conventional method
Use hydrogen sulfide and the Mei Luokesi extracting and oxidizing technique removal of mercaptans of alkali cleaning removing remaining.
CN201210010236 relates to a kind of for liquefied gas alkaline mud desulfurization and the device of neutralization and processing method, described device
Including alkaline residue oxidation sweetening carbonization neutralizing tower, alkaline residue oxidation sweetening carbonization neutralizing tower is divided in oxidation sweetening district and carbonization by dividing plate
And district；Use the microvesicle oxidation technology that entirely contacts, vulcanized sodium in alkaline residue and sodium mercaptides content aoxidized and is reduced to below 10ppm,
Using the multistage microvesicle carbonization technology that entirely contacts, NaOH carbonization in alkaline residue being neutralized is sodium acid carbonate, by residual simultaneously
The vulcanized sodium, sodium mercaptides and the disulphide that stay are further reduced to below 1ppm, and the wastewater pH of generation is reduced to 8-9, COD
It is reduced to below 1000mg/L.
Alkali lye is through recycling after a while, because concentration, quality decline needs and change in time.In prior art, technique sets
It is calculated as entering spent lye the alkaline residue tank of normal temperature and pressure, then disposes with being pumped to downstream its Future about Alkaline Residue Treatment Unit.Moving back alkaline residue process
In, the problem of liquid hydrocarbon component is carried in inevitable existence, if there is operational error to also result in a large amount of liquid hydrocarbon entrance alkaline residue
Tank, prior art is all by the gas discharging directly into atmosphere in alkaline residue tank, inevitably there is serious potential safety hazard and environment is dirty
Dye.
Summary of the invention
The technical problem to be solved is in prior art during moving back alkaline residue, and inevitable existence carries liquid hydrocarbon
Component, operational error can cause a large amount of liquid hydrocarbon to enter alkaline residue tank, and gas discharging directly into atmosphere exists serious potential safety hazard and environment
The problem polluted, it is provided that a kind of new liquefied petroleum gas waste soda residue degassing method.The method takes off for liquefied petroleum gas waste soda residue
In gas, there is non-environmental-pollution, advantage that waste gas is utilized.
For solving above-mentioned technical problem, the technical solution used in the present invention is as follows: a kind of liquefied petroleum gas waste soda residue degassing method,
First-selected contact in caustic wash tower with alkali lye by liquefied petroleum gas obtains effluent (1), is then out thing (1) and enters settling tank
Sedimentation separation, gas phase is from the discharge of settling tank top, and the alkali lye of the hydrocarbon containing liquid bottom settling tank enters the degassing of alkaline residue degassing tank,
The hydrocarbon component that alkaline residue degassing tank top obtains enters low pressure gas pipe network, and the alkaline residue obtained bottom alkaline residue degassing tank is delivered to follow-up
Processing means；Wherein, the operating condition of described alkaline residue degassing tank is: pressure is calculated as-0.08MPa to normal pressure, temperature with gauge pressure
Degree is for more than 0 DEG C to 95 DEG C.
In technique scheme, it is preferable that described alkali lye is circulation alkali liquor and the mixture of fresh alkali lye.
In technique scheme, it is preferable that the operating condition of described settling tank is: pressure is calculated as normal pressure to 0.1MPa with gauge pressure,
Temperature is more than 0 DEG C to 95 DEG C.
In technique scheme, it is preferable that the 20-50% conduct by weight of the alkali lye of the hydrocarbon containing liquid bottom described settling tank
Described circulation alkali liquor returns caustic wash tower, and 50-80% enters alkaline residue degassing tank as spent lye.
In technique scheme, it is preferable that described alkali lye is selected from alkali metal or the hydroxide of alkaline-earth metal or carbonate.
In technique scheme, it is preferable that the operating condition of described caustic wash tower is: pressure is calculated as normal pressure to 0.1MPa with gauge pressure,
Temperature is more than 0 DEG C to 95 DEG C.
In technique scheme, it is preferable that the operating condition of described alkaline residue degassing tank is: pressure is calculated as-0.05MPa with gauge pressure
To normal pressure, temperature is that normal temperature is to 60 DEG C.
Liquid hydrocarbon is carbon containing three, the blending ingredients of carbon four, and under normal temperature, certain pressure, liquefaction is liquid, and pressure drop is as little as
Normal pressure or pressure-fired i.e. gasify as gas, utilize the characteristic of its highly volatile, and low pressure flash technology can be taked to reach alkaline residue degassing
Purpose.Due to the fact that spent lye is caused alkaline residue degassing tank by employing, go out, by flash separation, the hydrocarbon component that spent lye carries,
Then it is emitted into low pressure gas pipe network, makes full use of oil plant existing low pressure gas pipe network and supporting gas holder, compressor reclaim
Facility, can realize hermetic reclaim, it is to avoid potential safety hazard that waste gas discharging directly into atmosphere causes and environmental pollution, and can in device
To arrange pressure and show, alarming instrument, the tracking to operating process, monitoring can be implemented, occur abnormal can finding in time,
Dispose immediately, achieve preferable technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of flow process of the present invention.
Fig. 2 is the schematic flow sheet of prior art.
In Fig. 1: 1 is fresh alkali lye pipeline；2 is alkaline residue pump；3 is that alkaline residue is to subsequent treatment pipeline；4 is valve；5 are
Liquefied petroleum gas pipeline；6 is caustic wash tower；7 is caustic wash tower outlet line；8 is settling tank；9 is valve；10 is settling tank
Bottom discharge pipe；11 is settling tank top discharge exhaust duct line；12 is valve；13 is that spent lye is to degassing tank pipeline；14 are
Alkaline residue degassing tank；15 is valve；16 is alkaline residue degassing tank top gas discharge pipe line；17 is alkaline residue bottom alkaline residue degassing tank
Discharge pipe line；18 is blender.
In Fig. 2: 1 is fresh alkali lye pipeline；2 is that alkaline residue is to subsequent treatment pipeline；3 is alkaline residue pump；4 is valve；5 are
Liquefied petroleum gas pipeline；6 is caustic wash tower；7 is caustic wash tower outlet line；8 is settling tank；9 is valve；10 is settling tank
Bottom discharge pipe；11 is settling tank top discharge exhaust duct line；12 is valve；13 is that spent lye is to alkaline residue tank pipeline；14 are
Alkaline residue tank top blow-down pipe；15 is alkaline residue tank；16 is valve；17 is alkaline residue pump discharge pipeline；18 is blender.
Below by embodiment, the invention will be further elaborated, but is not limited only to the present embodiment.
Detailed description of the invention
[embodiment 1]
In certain liquefied petroleum gas alkali cleaning, the waste soda residue degassing system, liquefied petroleum gas with include circulation alkali liquor, fresh alkali lye
Alkali lye contacts in caustic wash tower, then enters settling tank together with alkali lye, and liquefied petroleum gas is discharged from settling tank top, sedimentation
The alkali lye of pot bottom 20% enters return caustic wash tower after blender mixes with fresh alkali lye as described circulation alkali liquor by weight,
80% enters alkaline residue degassing tank as spent lye, and the liquefied petroleum tolerance that alkaline residue contains is 12%(volume).Alkaline residue degassing tank
Top is provided with gas discharge line and is connected with low pressure gas pipe network, is provided with alkaline residue pump, is delivered to by alkaline residue bottom alkaline residue degassing tank
Aftertreatment device.The operating condition of alkaline residue degassing tank is: pressure is calculated as-0.08MPa with gauge pressure, and temperature is 0.5 DEG C；Heavy
The operating condition of fall tank is: pressure is calculated as normal pressure with gauge pressure, and temperature is 1 DEG C.Alkali lye be weight concentration be the hydroxide of 20%
Sodium, alkaline residue degassing tank deck arrange pressure show, alarming instrument, can implement the tracking to operating process, monitoring, exception occurs
Can find in time, dispose immediately.In the case of pressure anomaly occurs in alkaline residue degassing tank, can realize and liquid by closing valve closing 12
Change qi exhaustion mercaptan system to cut off rapidly.Result shows in the alkaline residue of alkaline residue transport pump without liquefied petroleum gas.
[embodiment 2]
In certain liquefied petroleum gas alkali cleaning, the waste soda residue degassing system, liquefied petroleum gas with include circulation alkali liquor, fresh alkali lye
Alkali lye contacts in caustic wash tower, then enters settling tank together with alkali lye, and liquefied petroleum gas is discharged from settling tank top, sedimentation
The alkali lye of pot bottom 50% enters return caustic wash tower after blender mixes with fresh alkali lye as described circulation alkali liquor by weight,
50% enters alkaline residue degassing tank as spent lye, and the liquefied petroleum tolerance that alkaline residue contains is 11%(volume).Alkaline residue degassing tank
Top is provided with gas discharge line and is connected with low pressure gas pipe network, is provided with alkaline residue pump, is delivered to by alkaline residue bottom alkaline residue degassing tank
Aftertreatment device.The operating condition of alkaline residue degassing tank is: pressure is calculated as normal pressure with gauge pressure, and temperature is 95 DEG C；Settling tank
Operating condition is: pressure is calculated as 0.1MPa with gauge pressure, and temperature is 95 DEG C.Alkali lye be weight concentration be the sodium carbonate of 20%,
Alkaline residue degassing tank deck arrange pressure show, alarming instrument, can implement the tracking to operating process, monitoring, occur that exception can
Find in time, dispose immediately.In the case of pressure anomaly occurs in alkaline residue degassing tank, can realize and liquefied gas by closing valve closing 12
Removal of mercaptans system is cut off rapidly.Result shows in the alkaline residue of alkaline residue transport pump without liquefied petroleum gas.
[embodiment 3]
In certain liquefied petroleum gas alkali cleaning, the waste soda residue degassing system, liquefied petroleum gas with include circulation alkali liquor, fresh alkali lye
Alkali lye contacts in caustic wash tower, then enters settling tank together with alkali lye, and liquefied petroleum gas is discharged from settling tank top, sedimentation
The alkali lye of pot bottom 40% enters return caustic wash tower after blender mixes with fresh alkali lye as described circulation alkali liquor by weight,
60% enters alkaline residue degassing tank as spent lye, and the liquefied petroleum tolerance that alkaline residue contains is 10%(volume).Alkaline residue degassing tank
Top is provided with gas discharge line and is connected with low pressure gas pipe network, is provided with alkaline residue pump, is delivered to by alkaline residue bottom alkaline residue degassing tank
Aftertreatment device.The operating condition of alkaline residue degassing tank is: pressure is calculated as-0.1MPa with gauge pressure, and temperature is 65 DEG C；Sedimentation
The operating condition of tank is: pressure is calculated as 0.05MPa with gauge pressure, and temperature is 65 DEG C.Alkali lye be weight concentration be the carbonic acid of 20%
Hydrogen potassium, alkaline residue degassing tank deck arrange pressure show, alarming instrument, the tracking to operating process, monitoring can be implemented, occur different
Often can find in time, dispose immediately.In the case of there is pressure anomaly in alkaline residue degassing tank, by close valve closing 12 can realize with
Liquid gas sweetening system is cut off rapidly.Result shows in the alkaline residue of alkaline residue transport pump without liquefied petroleum gas.
[comparative example 1]
In certain liquefied petroleum gas alkali cleaning, the waste soda residue degassing system, liquefied petroleum gas with include circulation alkali liquor, fresh alkali lye
Alkali lye contacts in caustic wash tower, then enters settling tank together with alkali lye, and liquefied petroleum gas is discharged from settling tank top, sedimentation
The alkali lye of pot bottom 40% enters return caustic wash tower after blender mixes with fresh alkali lye as described circulation alkali liquor by weight,
60% enters alkaline residue tank as spent lye, and the liquefied petroleum tolerance that alkaline residue contains is 10%(volume).Alkaline residue tank is that normal temperature is normal
Pressure, the liquefied petroleum gas that spent lye carries directly is vented from alkaline residue tank top and enters air, and the waste soda residue of bottom passes through alkaline residue pump
Sending into aftertreatment systems, result shows in the alkaline residue of alkaline residue transport pump containing 6%(weight) liquefied petroleum gas.
Obviously, the liquefied petroleum gas that the present invention uses the method for flash liberation to be carried by spent lye is separated, and is incorporated to low pressure
Gas pipe network, both makes the liquefied petroleum gas carried be utilized effectively, prevents atmosphere pollution simultaneously, eliminate potential safety hazard,
Can be used for petroleum gas sweetening system to obtain in waste soda residue degassing system.
Claims (2)
1. a liquefied petroleum gas waste soda residue degassing method, first-selected contact in caustic wash tower with alkali lye by liquefied petroleum gas is flowed out
Thing (1), is then out thing (1) and enters settling tank sedimentation separation, and gas phase is discharged from settling tank top, bottom settling tank
The alkali lye of hydrocarbon containing liquid enters the degassing of alkaline residue degassing tank, and the hydrocarbon component that alkaline residue degassing tank top obtains enters low pressure gas pipe network,
The alkaline residue obtained bottom alkaline residue degassing tank is delivered to aftertreatment device；Wherein, the operating condition of described alkaline residue degassing tank is:
Pressure is calculated as-0.08MPa to normal pressure with gauge pressure, and temperature is more than 0 DEG C to 95 DEG C；The operating condition of described settling tank is:
Pressure is calculated as normal pressure to 0.1MPa with gauge pressure, and temperature is more than 0 DEG C to 95 DEG C；The operating condition of described caustic wash tower is: pressure
Power is calculated as normal pressure to 0.1MPa with gauge pressure, and temperature is more than 0 DEG C to 95 DEG C；The alkali lye of the hydrocarbon containing liquid bottom settling tank with
Weight meter 20-50% returns caustic wash tower as described circulation alkali liquor, and 50-80% enters alkaline residue degassing tank as spent lye；Described
Alkali lye is selected from alkali metal or the hydroxide of alkaline-earth metal or carbonate；Described alkali lye is circulation alkali liquor and the mixing of fresh alkali lye
Thing.
Liquefied petroleum gas waste soda residue degassing method the most according to claim 1, it is characterised in that the operation of described alkaline residue degassing tank
Condition is: pressure is calculated as-0.05MPa to normal pressure with gauge pressure, and temperature is that normal temperature is to 60 DEG C.
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| CN201310492221.0A CN103805225B (en) | 2013-10-18 | 2013-10-18 | Liquefied petroleum gas waste soda residue degassing method |
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| CN201310492221.0A CN103805225B (en) | 2013-10-18 | 2013-10-18 | Liquefied petroleum gas waste soda residue degassing method |
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| CN103805225B true CN103805225B (en) | 2016-08-24 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201157769Y (en) * | 2008-02-22 | 2008-12-03 | 山东华安新材料有限公司 | Liquefied gas water caustic wash apparatus system |
| CN103232855A (en) * | 2013-05-07 | 2013-08-07 | 中海油（青岛）重质油加工工程技术研究中心有限公司 | Process of removing hydrogen sulfide in petroleum light hydrocarbon |
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- 2013-10-18 CN CN201310492221.0A patent/CN103805225B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201157769Y (en) * | 2008-02-22 | 2008-12-03 | 山东华安新材料有限公司 | Liquefied gas water caustic wash apparatus system |
| CN103232855A (en) * | 2013-05-07 | 2013-08-07 | 中海油（青岛）重质油加工工程技术研究中心有限公司 | Process of removing hydrogen sulfide in petroleum light hydrocarbon |
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Effective date of registration: 20160721 Address after: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Applicant after: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. Applicant after: Sinopec Corp. Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant before: Sinopec Corp. Applicant before: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. |
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