CN109321297A - A kind of oil field gas treatment process - Google Patents
A kind of oil field gas treatment process Download PDFInfo
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- CN109321297A CN109321297A CN201811358075.1A CN201811358075A CN109321297A CN 109321297 A CN109321297 A CN 109321297A CN 201811358075 A CN201811358075 A CN 201811358075A CN 109321297 A CN109321297 A CN 109321297A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
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Abstract
The invention discloses a kind of oil field gas treatment process, belong to oil field gas processing technology field, the treatment process is the following steps are included: associated gas compression step, drying steps, ammonia precooling step, expander refrigeration step, product fractionating step, dry gas generation steps, the drying steps use composite membrane drying and dehydrating, the composite membrane is to reticulate underlying membrane by stainless steel fibre and glass fibre mixed weaving, using the double-layered compound film formed by a firing after film green compact；The present invention is that dry gas power generation is used for after handling oil field gas, and associated gas process operations are simple, and processing step is succinct, and are dehydrated using film dry technology, and dewatering speed is fast, and gas transit dose is high, will not generate dust and cause secondary pollution.
Description
Technical field
The present invention relates to oil field gas processing technology field more particularly to a kind of oil field gas treatment process.
Background technique
Oil field gas is also known as petroleum solution gas, the preservation in the high pressure rock stratum hole under geological conditions, with crude oil symbiosis
It is molten altogether, it mutually hands over mixed.After crude oil is produced, due to the variation of temperature and pressure, associated gas with gas form is separated with crude oil and
Individually being precipitated becomes air-flow.Under normal conditions, the main body of oil field gas is C1-C5All multicomponents, in addition there are also N2、H2、
H2S and CO2Deng.It is taken seriously due to it is worth with particularly important energy value and petrochemical material.There are about 137 in the whole world
×1012Therefore the natural gas proved reserves of cubic meter, utilize tool to oil field gas wherein about 70% is oil field gas
There is earthshaking meaning.Currently, predominantly being produced to the utilization ways of oil field gas, life fuel and as chemical industry original
Material.For many years, the country is generally to carry out casing annulus discharge to associated gas based on crude oil production, part oil field by its
The heating and dehydration of oil storage tank are carried out in well site as fuel, is used in the associated gas of a small number of oil wells close to village by local farmers
To live and warm oneself.Most of associated gas uses direct emission, not only pollutes the environment, more causes the huge wave of resource
Take, in addition, also containing a small amount of propane, butane, pentane because associated gas main component is the low molecules alkane such as methane, ethane
Deng belonging to inflammable, explosive, poisonous pernicious gas, a large amount of associated gas discharge is aerial, also will cause some potential safety problems.
Currently, domestic provide dyestuff to oil field gas treated comprehensive utilization includes dry gas power generation, for automobile, produce
The methods of Chemical Solvents, lighter hydrocarbons recovery.Wherein, associated gas power generation is using associated gas as fuel, and associated gas is by dehydration, purification
And process for recovering light hydrocarbon, after extracting liquefied gas and light oil, main component is the processing natural gas of methane dry gas, dry gas
Power generation is one of most common associated gas processing mode.Because easy to operate, convenient transportation, high combustion efficiency does not contain ash
Equal solid impurities, so environmental pollution is smaller.Associated gas needs to be dehydrated in associated gas treatment process, avoids in condensation
Liquid is precipitated in conjunction with the sour gas of associated gas, pipeline, valve and other equipment are caused to corrode, or in dry gas power generation rank
Section, cause to burn abnormal, stifled nozzles, tempering, quick-fried sound or even phenomena such as explode.Currently most used is molecular sieve dehydration,
But need to increase dust collecting process after using molecular sieve dehydration, so it is unfavorable for the simplification of oil field gas treatment process, and it is normal
The film for the filtering hydrone seen is not suitable for having a large amount of organic steams and the associated gas with liquid greasy dirt, so to petroleum companion
Desciccator diaphragm used in angry treatment process should be a kind of filter membrane fitted entirely into associated gas environment, which needs
It wants dewatering speed fast, does not in addition cause dust pollution, gas transit dose is high.
Summary of the invention
Aiming at the shortcomings in the prior art, the object of the present invention is to provide a kind of oil field gas treatment process, especially
Dry gas power generation is used for after oil field gas is handled, associated gas process operations to be simple, and processing step is succinct, and use film
Dry technology dehydration, dewatering speed is fast, and gas transit dose is high, will not generate dust and cause secondary pollution.
The present invention solves above-mentioned technical problem by following technological means:
A kind of oil field gas treatment process, the treatment process is the following steps are included: associated gas compression step, dry step
Suddenly, ammonia precooling step, expander refrigeration step, product fractionating step, dry gas generation steps, the drying steps use composite membrane
Drying and dehydrating, the composite membrane is to reticulate underlying membrane by stainless steel fibre and glass fibre mixed weaving, using film pressure
The double-layered compound film formed by a firing after base.
Further, the treatment process the following steps are included:
Associated gas compression step: oil field gas is passed through gas-liquid separator and carries out impurity and three phase separation, after separation
Gas, which successively enters in two compressors, carries out two stages of compression cooling；
Drying steps: associated gas after cooling will be compressed and be passed through progress composite membrane drying and dehydrating in drier, then passed to
Heat exchanger heat exchange cooling；
Ammonia precooling step: the associated gas after dry cooling is passed through ammonia evaporator and carries out ammonia evaporation pre-cooling；
Expander refrigeration step: by being passed through by the associated gas of ammonia precooling step low temperature is passed through after expanding machine is expanded changes
Hot device, obtains liquefaction of associated gas；
Product fractionating step: the liquefaction of associated gas that expander refrigeration step obtains is passed through dethanizer fractionation, deethanization
Tower bottom liquid is passed through debutanizing tower, isolates liquefied petroleum gas and stable light hydrocarbon, and product zone is sent in tinning respectively；
Dry gas generation steps: methane and ethane that deethanizer overhead comes out are generated electricity.
Further, in the associated gas compression step, associated gas is compressed to 0.8~1.1Mpa after one stage of compression, through two
Associated gas is compressed to 2.1~2.5MPa after grade compression, and in the associated gas compression step, one stage of compression is cooled to 30~35 DEG C,
Two-stage compression is cooled to 20~25 DEG C.
Further, in the drying steps, 5-10 DEG C is cooled to by heat exchanger, in ammonia precooling step, is cooled to -10 in advance
~-25 DEG C.
Further, in the expander refrigeration step, associated gas is cooled to -45~-50 DEG C and liquefies.
Further, the preparation step of the composite membrane is as follows:
Bottom film preparation: stainless steel fibre and glass fibre mixed weaving is taken to form netted underlying membrane；
Film green compact: aluminium oxide, aluminium nitride, silica is taken to mix with the ethanol solution of 45~65wt%, at normal temperature
Ultrasonication dispersion 0.5h obtains mixed liquor, be added acetone and in ball milling 22 in the ball mill of 200~250rpm of revolving speed~
25h, ball-milling medium are alumina balls, then dry at 90~100 DEG C, after obtained mixed-powder is sintered 1~2h, are taken out
To composite powder, composite powder is mixed with Silica hydrogel, sodium bicarbonate powder, polyimide powder, stirring is prepared into paste
Object is coated on underlying membrane, using compression molding method compression moulding under 15~20MPa of pressure, obtains film green compact；
The firing of composite membrane: 1~2h is fired at a temperature of film green compact is placed in 250~300 DEG C, is obtained after cooling compound
Film.
Further, in the film green compact step, aluminium oxide, aluminium nitride, silica, ethanol solution mass ratio be 1:
0.5:1:5, the aluminium oxide select the γ-Al for belonging to cubic system2O3。
Further, in the film green compact step, composite powder, Silica hydrogel, sodium bicarbonate powder, polyimide powder
Mass ratio is 4:0.8:0.5:1.5.
Further, in the firing step of the composite membrane, the specific surface area of composite membrane is 550-680m2/ g, porosity are
65-75%.
Further, in the film green compact step, mixed-powder vacuum under conditions of 1500~1800 DEG C, 8~10MPa
It is sintered 1~2h.
A kind of oil field gas treatment process provided by the invention, has the beneficial effect that:
One, when associated gas compression step, by gas-liquid separator by the impurity and solid-liquid-gas in raw material associated gas
In liquid-solid two-phase separate, prevent from damaging equipment or being adhered in equipment in the technique below, using compressor pair
Associated gas carries out the primary cooling-two-stage compression-second level cooling of one stage of compression-, gradually pressurizes and cools down, conducive to later period associated gas
Liquefaction.It is dried in the drier of drying steps using composite membrane, removes most of moisture, can simplify dry step
Suddenly, dust collecting process is reduced, simplifies the treatment process of associated gas more.Ammonia precooling step and expander refrigeration step are by associated gas
Temperature be gradually decreased to it is subzero, then by association gas liquefaction.In product fractionating step, low temperature liquid hydrocarbon enters dethanizer, by first
Alkane and ethane are fractionated from top, carry out dry gas power generation, and the remaining liquid hydrocarbon that tower bottom comes out is passed through debutanizing tower, will contain fourth
The stable light hydrocarbon of alkane exists respectively from tower top, and the liquefied petroleum gas of heavy constituent is canned respectively out from tower bottom, completes oil field gas
Treatment process.
Two, hydrone is filtered using composite membrane and not only simplifies dewatering process, and dewatering speed is fast, gas flux
Height will not bring dust, cause secondary pollution, more beneficial to oil field gas treatment process.Composite membrane is using bilayer
Structure, bottom be stainless steel fibre and glass fibre mixed weaving at netted underlying membrane, not only there is high-intensitive, resistance to height
Warm, low temperature resistant feature also has the performances such as corrosion-resistant, anti-oxidant, can provide good support effect for composite membrane, and incite somebody to action
The composite powder of excellent mechanical performance, the aluminium oxide of selection is prepared in aluminium oxide, aluminium nitride, silica mixed sintering
Using γ-Al2O3Belonging to cubic system, be the solid material of porosity, high degree of dispersion, there is very big specific surface area, activity is big,
And absorption property is good.Composite powder and Silica hydrogel, sodium bicarbonate powder, polyimide powder are mixed with as after paste
With underlying membrane compression moulding, after 250~300 DEG C of temperature are fired, sodium bicarbonate powder, which generates carbon dioxide, makes thawing
Silica hydrogel and polyimide surface generate a large amount of diameters about 0.3nm or so micropore, but because in sintering procedure due to various oxidations
The physical property of object it is different, be easy to generate crack at hole when by external pressure and high temperature, after cooling, these are subtle
The micro-pore diameter that crack growth carbon dioxide gas generates, can reach 0.40nm or so, hydrone can be hindered to pass through, but not
It hinders the substances such as methane, ethane to pass through, can achieve the purpose of dehydration.And the specific surface area of composite membrane is 550-680m2/ g,
Porosity is 65-75%, and the transit dose of gas is high, and dewatering speed is fast.
Detailed description of the invention
Fig. 1 is associated gas processing technological flow figure.
Specific embodiment
Below with reference to specific embodiments and the drawings 1, the present invention is described in detail:
Embodiment 1: the preparation one of composite membrane:
The preparation step of the present embodiment is as follows:
Bottom film preparation: by stainless steel fibre and the webbed underlying membrane of glass fibre mixed weaving；
Film green compact: by 50g aluminium oxide, 25g γ-Al2O3, the ethanol solution of 50g silica and 250ml 45wt% it is mixed
After conjunction, mixture is obtained using the ultrasonication dispersion 0.5h of 30kHz at normal temperature, mixture is mixed with 100ml acetone
Afterwards, it is placed in the ball mill that revolving speed is 200rpm and carries out ball milling 25h, ball-milling medium is alumina balls, will be mixed after the completion of ball milling
It closes object to take out, is dried to mixed-powder at 90 DEG C, vacuum is pre-sintered 2h under conditions of 1500 DEG C, 10MPa by mixed-powder
It takes out afterwards and obtains composite powder, 40g composite powder and 20g Silica hydrogel, 5g sodium bicarbonate powder, 15g polyimide powder are adopted
It is prepared into paste with the high-speed mixer stirring of 8000rpm, is coated on underlying membrane, being pressurizeed using compression molding device will
Paste is compressed together with underlying membrane, and pressing pressure 15Map obtains film green compact；
The firing of composite membrane: film green compact being placed at a temperature of 250 DEG C and fires 2h, obtains composite membrane after cooling, is detected
The specific surface area of composite membrane is 557m2/ g, porosity 65%.
Embodiment 2: the preparation two of composite membrane:
The preparation step of the present embodiment is as follows:
Bottom film preparation: by stainless steel fibre and the webbed underlying membrane of glass fibre mixed weaving；
Film green compact: by 50g aluminium oxide, 25g γ-Al2O3, the ethanol solution of 50g silica and 250ml 50wt% it is mixed
After conjunction, mixture is obtained using the ultrasonication dispersion 0.5h of 30kHz at normal temperature, mixture is mixed with 100ml acetone
Afterwards, it is placed in the ball mill that revolving speed is 250rpm and carries out ball milling 23h, ball-milling medium is alumina balls, will be mixed after the completion of ball milling
It closes object to take out, is dried to mixed-powder at 95 DEG C, by mixed-powder under conditions of 1600 DEG C, 9MPa after vacuum pre-sintering 2h
Taking-up obtains composite powder, and 40g composite powder and 32g Silica hydrogel, 20g sodium bicarbonate powder, 60g polyimide powder are used
The high-speed mixer stirring of 8000rpm is prepared into paste, is coated on underlying membrane, will paste using compression molding device pressurization
Shape object and underlying membrane are compressed together, and pressing pressure 18Map obtains film green compact；
The firing of composite membrane: film green compact being placed at a temperature of 280 DEG C and fires 2h, obtains composite membrane after cooling, is detected
The specific surface area of composite membrane is 577m2/ g, porosity 66%.
Embodiment 3: the preparation three of composite membrane:
The preparation step of the present embodiment is as follows:
Bottom film preparation: by stainless steel fibre and the webbed underlying membrane of glass fibre mixed weaving；
Film green compact: by 80g aluminium oxide, 40g γ-Al2O3, the ethanol solution of 80g silica and 400ml 65wt% it is mixed
After conjunction, mixture is obtained using the ultrasonication dispersion 0.5h of 30kHz at normal temperature, mixture is mixed with 100ml acetone
Afterwards, it is placed in the ball mill that revolving speed is 200rpm and carries out ball milling 25h, ball-milling medium is alumina balls, will be mixed after the completion of ball milling
It closes object to take out, is dried to mixed-powder at 100 DEG C, vacuum is pre-sintered 1h under conditions of 1800 DEG C, 8MPa by mixed-powder
It takes out afterwards and obtains composite powder, by 60g composite powder and 30g Silica hydrogel, 7.5g sodium bicarbonate powder, 22.5g polyimide powder
End is prepared into paste using the high-speed mixer stirring of 9000rpm, is coated on underlying membrane, will using compression molding device
Paste and underlying membrane pressurization are compressed together, and pressing pressure 20Map obtains film green compact；
The firing of composite membrane: film green compact being placed at a temperature of 300 DEG C and fires 1h, obtains composite membrane after cooling, compound
The specific surface area of film is 620m2/ g, porosity 70%.
Embodiment 4: associated gas treatment process one:
The treatment process of the present embodiment is as shown in Figure 1；
Associated gas compression step: raw material associated gas is passed through gas-liquid separator progress impurity and three phase separation, gas enter pressure
Contracting machine carries out one stage of compression, and the cooler through overcompression machine once cools down after being compressed to 0.8Mpa, is cooled to after 30 DEG C and carries out again
Compressor two-stage compression is compressed to the cooler secondary cooling through overcompression machine after 2.1MPa, and after being cooled to 20 DEG C, entrance is next
Step, detection raw material associated gas are 14kg/m containing vapour quantity3；
Drying steps: the composite membrane that the associated gas of compression step is passed through progress 1 method of embodiment preparation in drier is done
Dry dehydration then passes to heat exchanger and is once cooled down, and associated gas enters next step after being cooled to 5 DEG C, after detection is dry
Associated gas is 0.7kg/m containing vapour quantity3；
Ammonia precooling step: being passed through ammonia evaporator for the associated gas of drying steps and be cooled down twice, be cooled to -25 DEG C it is laggard
Enter next step；
Expander refrigeration step: by being passed through by the associated gas of ammonia precooling step low temperature is passed through after expanding machine is expanded changes
Hot device, associated gas are cooled to -50 DEG C, obtain liquefaction of associated gas, into step once；
Product fractionating step: being passed through dethanizer for the liquefaction of associated gas that expander refrigeration step obtains, will be from deethanization
The methane and ethane that column overhead comes out send to dry gas generation steps, and the remaining liquid hydrocarbon of tower bottom come out is passed through debutanizing tower, will
The stable light hydrocarbon containing butane that debutanizing tower tower top comes out is canned, the heavy constituent liquefied petroleum gas tinning that will be come out from tower bottom,
It is then sent for product zone；
Dry gas generation steps: methane that product fractionating step obtains, ethane are generated electricity.
Embodiment 5: associated gas treatment process two:
The treatment process of the present embodiment is as shown in Figure 1；
Associated gas compression step: raw material associated gas is passed through gas-liquid separator progress impurity and three phase separation, gas enter pressure
Contracting machine carries out one stage of compression, and the cooler through overcompression machine once cools down after being compressed to 1Mpa, is pressed again after being cooled to 33 DEG C
Contracting machine two-stage compression is compressed to the cooler secondary cooling through overcompression machine after 2.3MPa, after being cooled to 23 DEG C, into next step
Suddenly, detection raw material associated gas is 14kg/m containing vapour quantity3；
Drying steps: the composite membrane that the associated gas of compression step is passed through progress 2 method of embodiment preparation in drier is done
Dry dehydration then passes to heat exchanger and is once cooled down, and associated gas enters next step after being cooled to 7 DEG C, after detection is dry
Associated gas is 1kg/m containing vapour quantity3；
Ammonia precooling step: being passed through ammonia evaporator for the associated gas of drying steps and be cooled down twice, be cooled to -15 DEG C it is laggard
Enter next step；
Expander refrigeration step: by being passed through by the associated gas of ammonia precooling step low temperature is passed through after expanding machine is expanded changes
Hot device, associated gas are cooled to -46 DEG C, obtain liquefaction of associated gas, into step once；
Product fractionating step: being passed through dethanizer for the liquefaction of associated gas that expander refrigeration step obtains, will be from deethanization
The methane and ethane that column overhead comes out send to dry gas generation steps, and the remaining liquid hydrocarbon of tower bottom come out is passed through debutanizing tower, will
The stable light hydrocarbon containing butane that debutanizing tower tower top comes out is canned, the heavy constituent liquefied petroleum gas tinning that will be come out from tower bottom,
It is then sent for product zone；
Dry gas generation steps: methane that product fractionating step obtains, ethane are generated electricity.
Embodiment 6: associated gas treatment process three:
The treatment process of the present embodiment is as shown in Figure 1；
Associated gas compression step: raw material associated gas is passed through gas-liquid separator progress impurity and three phase separation, gas enter pressure
Contracting machine carries out one stage of compression, and the cooler through overcompression machine once cools down after being compressed to 1.1Mpa, is cooled to after 35 DEG C and carries out again
Compressor two-stage compression is compressed to the cooler secondary cooling through overcompression machine after 2.5MPa, and after being cooled to 25 DEG C, entrance is next
Step, detection raw material associated gas are 14kg/m containing vapour quantity3；
Drying steps: the composite membrane that the associated gas of compression step is passed through progress 3 method of embodiment preparation in drier is done
Dry dehydration then passes to heat exchanger and is once cooled down, and associated gas enters next step after being cooled to 10 DEG C, after detection is dry
Associated gas is 0.9kg/m containing vapour quantity3；
Ammonia precooling step: being passed through ammonia evaporator for the associated gas of drying steps and be cooled down twice, be cooled to -10 DEG C it is laggard
Enter next step；
Expander refrigeration step: by being passed through by the associated gas of ammonia precooling step low temperature is passed through after expanding machine is expanded changes
Hot device, associated gas are cooled to -50 DEG C, obtain liquefaction of associated gas, into step once；
Product fractionating step: being passed through dethanizer for the liquefaction of associated gas that expander refrigeration step obtains, will be from deethanization
The methane and ethane that column overhead comes out send to dry gas generation steps, and the remaining liquid hydrocarbon of tower bottom come out is passed through debutanizing tower, will
The stable light hydrocarbon containing butane that debutanizing tower tower top comes out is canned, the heavy constituent liquefied petroleum gas tinning that will be come out from tower bottom,
It is then sent for product zone；
Dry gas generation steps: methane that product fractionating step obtains, ethane are generated electricity.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement should all cover without departing from the objective and range of technical solution of the present invention in claim of the invention
In range.Technology not described in detail in the present invention, shape, construction portion are well-known technique.
Claims (10)
1. a kind of oil field gas treatment process, which is characterized in that the treatment process is the following steps are included: associated gas compression step
Suddenly, drying steps, ammonia precooling step, expander refrigeration step, product fractionating step, dry gas generation steps, the drying steps
Using composite membrane drying and dehydrating, the composite membrane be underlying membrane is reticulated by stainless steel fibre and glass fibre mixed weaving, then
The double-layered compound film formed by a firing after film green compact.
2. a kind of oil field gas treatment process according to claim 1, which is characterized in that the treatment process include with
Lower step:
Associated gas compression step: being passed through gas-liquid separator for oil field gas and carry out impurity and three phase separation, the gas after separation
Successively enter in two compressors and carries out two stages of compression cooling；
Drying steps: associated gas after cooling will be compressed and be passed through progress composite membrane drying and dehydrating in drier, then pass to heat exchange
Device heat exchange cooling；
Ammonia precooling step: the associated gas after dry cooling is passed through ammonia evaporator and carries out ammonia evaporation pre-cooling；
Expander refrigeration step: low-temperature heat exchange is passed through by being passed through after expanding machine is expanded by the associated gas of ammonia precooling step
Device obtains liquefaction of associated gas；
Product fractionating step: the liquefaction of associated gas that expander refrigeration step obtains is passed through dethanizer fractionation, dethanizer tower
Bottom liquid is passed through debutanizing tower, isolates liquefied petroleum gas and stable light hydrocarbon, and product zone is sent in tinning respectively；
Dry gas generation steps: methane and ethane that deethanizer overhead comes out are generated electricity.
3. a kind of oil field gas treatment process according to claim 2, which is characterized in that the associated gas compression step
In, associated gas is compressed to 0.8~1.1Mpa after one stage of compression, and associated gas is compressed to 2.1~2.5MPa after two-stage compression, institute
It states in associated gas compression step, one stage of compression is cooled to 30~35 DEG C, and two-stage compression is cooled to 20~25 DEG C.
4. a kind of oil field gas treatment process according to claim 5, which is characterized in that in the drying steps, lead to
It crosses heat exchanger and is cooled to 5-10 DEG C, in ammonia precooling step, be cooled to -10~-25 DEG C in advance.
5. a kind of oil field gas treatment process according to claim 4, which is characterized in that the expander refrigeration step
In, associated gas is cooled to -45~-50 DEG C and liquefies.
6. a kind of oil field gas treatment process according to claim 5, which is characterized in that the preparation of the composite membrane walks
It is rapid as follows:
Bottom film preparation: stainless steel fibre and glass fibre mixed weaving is taken to form netted underlying membrane；
Film green compact: taking aluminium oxide, aluminium nitride, silica to mix with the ethanol solution of 45~65wt%, ultrasonic at normal temperature
Wave processing dispersion 0.5h obtains mixed liquor, acetone is added and in 22~25h of ball milling, ball in the ball mill of 200~250rpm of revolving speed
Grinding media is alumina balls, then dry at 90~100 DEG C, and after obtained mixed-powder is sintered 1~2h, taking-up obtains compound
Powder mixes composite powder with Silica hydrogel, sodium bicarbonate powder, polyimide powder, and stirring is prepared into paste coating
In on underlying membrane, using compression molding method compression moulding under 15~20MPa of pressure, film green compact is obtained；
The firing of composite membrane: 1~2h is fired at a temperature of film green compact is placed in 250~300 DEG C, obtains composite membrane after cooling.
7. a kind of oil field gas treatment process according to claim 6, which is characterized in that the film green compact step
In, aluminium oxide, aluminium nitride, silica, ethanol solution mass ratio be 1:0.5:1:5, aluminium oxide selection belongs to cube
γ-the Al of crystallographic system2O3。
8. a kind of oil field gas treatment process according to claim 7, which is characterized in that the film green compact step
In, composite powder, Silica hydrogel, sodium bicarbonate powder, polyimide powder mass ratio be 4:0.8:0.5:1.5.
9. a kind of oil field gas treatment process according to claim 8, which is characterized in that the firing of the composite membrane walks
In rapid, the specific surface area of composite membrane is 550-680m2/ g, porosity 65-75%.
10. a kind of oil field gas treatment process according to claim 9, which is characterized in that the film green compact step
In, mixed-powder 1~2h of vacuum-sintering under conditions of 1500~1800 DEG C, 8~10MPa.
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