CN109609183A - Coal tar Method for treatment of oil based on supercritical methanol - Google Patents
Coal tar Method for treatment of oil based on supercritical methanol Download PDFInfo
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G57/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by at least one cracking process or refining process and at least one other conversion process
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Abstract
Coal tar Method for treatment of oil based on supercritical methanol, a certain amount of coal tar is added in the batch reactor with blender and is mixed with the methanol of corresponding ratio, with air in inert gas replacement kettle, it is warming up to 350~450 DEG C, constant temperature time 30-90min, temperature-controlled precision ± 5 DEG C obtain the light-end products that viscosity, boiling range, content of heteroatoms reduce after carrying out cooling；One and half open containers are mainly added in the improvement of batch reactor in kettle, control feed location, preliminary separation may be implemented to product, solve the problem of existing batch reactor can only be reacted, not can be carried out separation；The invention can realize the pretreatment of coal tar under conditions of one relatively mild, and the rate of recovery of methanol is high, while preliminary separation can be carried out to product.
Description
Technical field
The present invention relates to coal tar processing technology fields, and in particular to a kind of coal tar oil processing side based on supercritical methanol
Method.
Background technique
Coal resources in China is abundant, is maximum coal production state, and maximum consumption of coal state in the world.For a long time with
Come, Chinese non-renewable energy consumption is mainly coal, and accounting is 60% or more.In 2016, crude oil, natural gas, raw coal, water
Electricity, nuclear energy, renewable energy, clean energy resource the accounting that China's non-renewable energy is consumed be respectively 19.0%, 6.2%, 61.8%,
8.6%, 1.6%, 2.8%, 13.0%.With the rapid development of economy, the needs to the energy are also increasing, as " industry
Blood " petroleum be difficult to meet demand.Therefore coal oil technology increasingly obtains the concern of people.Coal tar is as Coal dressing
Byproduct in process product can be divided into according to pyrolysis temperature and production method: coalite tar (450-650 DEG C), middle coalite tar
(600-800 DEG C, low temperature, medium temperature producer), medium temperature coal tar (700-900 DEG C, medium temperature vertical heater) and high temperature coal-tar (900-
1000℃).In 2014,22,000,000 tons of the yield of coal tar, and be also increasing year by year.Coal tar processing mode mainly has: making
It directly burns for fuel oil, hydrogen is added to produce fuel oil, separation obtains high added value product etc..Adding hydrogen to produce fuel oil is to locate at present
The most commonly used means of coal tar are managed, and have been industrialized.But coal tar hydrogenating, need hydrogen as raw material, hydrogen at
This is relatively high, therefore many scholars find highly efficient, economic processing method.
Supercritical fluid is the fluid that temperature and pressure is higher than critical-temperature and critical pressure.Common supercritical fluid has
Supercritical methanol, supercritical water, supercritical carbon dioxide etc..Supercritical fluid has both the physicochemical properties of gas and liquid,
It is used in reaction and extraction process.Postcritical fluid density is close to density close to liquid, and viscosity is close to gas, mass transfer rate
Fastly.It is close therefore preferable to organic matter solvability with the dielectric constant of organic matter.In Near The Critical Point, solubility and density
Etc. physical parameters variation very greatly, can pass through control temperature and pressure control product distribution.Supercritical fluid is above-mentioned because having
Advantage, this method selection are handled coal tar with supercritical methanol, content of heteroatoms in coal tar are not only reduced, so that coal
Light component content increases in tar, while being installed additional by existing batch reactor, can carry out tentatively to coal tar
Separation.
Chinese patent CN102041053A describes a kind of coal tar oil treatment process, and coal tar is mixed with hydrogen supply dissolvent,
Hydrogen supply dissolvent includes naphthane or decahydronaphthalene, and the mixed weight ratio of coal tar and hydrogen supply dissolvent is 1:0.5~1:10, coal tar with
The mixture of hydrogen supply dissolvent is handled 0.2~5 hour at 15~40MPa of pressure and 200~500 DEG C of temperature, processing product separation
Hydrotreating is carried out after solid impurity out.The invention can obviously inhibit coking to combine simultaneously with hydrogenation technique, but due to
The addition of hydrogen supply dissolvent higher cost, higher pressure the high requirements on the equipment, catalyst can all make subsequent separation and recycling
At certain influence.
Chinese patent CN101033410A describes a kind of method with supercritical solvent hydrogenation processing coal tar, by coal
Reactor is added in tar stock, solvent, catalyst, carries out lighting reaction in the presence of hydrogen, then uses product
Distillation cutting separation.The solvent of addition is dimethylbenzene, acetone, hexamethylene.The minimum 7.2MPa of the pressure of reaction, temperature are minimum
350℃.Due to the addition by catalyst, difficulty can be caused to separation.The consumption of catalyst, the addition of hydrogen, will increase cost.
Chinese patent CN103282464A describes a kind of low value-added heavy hydrocarbon fractions are converted to high added value hydrocarbon-fraction plus hydrogen
Cracking method, this method use supercritical solvent as medium.There is the addition of catalyst and hydrogen in this method, reaction temperature is extremely
It is 360 DEG C few.
It can be seen that current coal tar oil processing from above-mentioned patent to need by some solvents, such as dimethylbenzene, acetone, ten
Hydrogen naphthalene etc., and these solvent costs are relatively high, it is larger to the pollution of environment.Further, since the addition of catalyst and hydrogen, right
Subsequent operation will also result in difficulty, while also increase cost.This patent selects supercritical methanol, has carried out to coal tar pre-
Processing, 239 DEG C of the critical-temperature of methanol, critical pressure 8.1MPa.Based on supercritical methanol modified coal-tar, temperature and pressure
Condition can the temperature and pressure based on supercritical water modified heavy oil it is low.Furthermore the boiling point of methanol is lower, is conducive to separate.It is overcritical
For methanol during upgrading heavy oil, both can be used as reaction medium can also be used as reactant.Methanol can participate in being esterified, alcohol
Solution, the reaction such as alkylation, has apparent facilitation.This patent creativeness is added half in current batch reactor simultaneously
Device is opened wide, is spread so that the light component in reaction is quickly dissolved in supercritical methanol, to realize preliminary point of weight component
From modification difficulty is low, and feasibility is relatively high.
Summary of the invention
In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide one kind to be based on supercritical methanol
Coal tar Method for treatment of oil, the present invention is a kind of completely new processing coal tar method, reduces boiling range and content of heteroatoms, sets simultaneously
A kind of simple separation method is counted, defect in the prior art is overcome with this.
In order to achieve the above object, the present invention adopts the following technical scheme:
Coal tar Method for treatment of oil based on supercritical methanol, includes the following steps:
1) coal tar is preheated, makes it have certain mobility；
2) coal tar and supercritical methanol are separately added into batch reactor and are sealed batch reactor, wherein surpassing
The mass ratio of critical methanol and coal tar is 0.5:1~3:1；
3) batch reactor is purged with inert gas, replaces air pocket in kettle；
4) batch reactor heating-up time and heating rate, the residence time when temperature reaches 350 DEG C~450 DEG C are controlled
For 30~90min, pressure is 50~250bar in kettle；
5) blender is stirred in batch reactor, so that mixture is uniformly dispersed in batch reactor；
6) batch reactor after reaction, is put into quenching in sink；
7) gas that reaction generates is collected or handles emptying；
8) liquid-solid phase product after cooling is separated into oil product and coke；
9) reaction kettle and blender are cleaned.
Coal tar and supercritical methanol are separately added into batch reactor there are two types of feed way described in step 2):
The first, coal tar and supercritical methanol are separately added into batch reactor, and the two sequence does not require, i.e., bottom adds
Material；Second, half being placed in batch reactor and opens wide device, coal tar is placed on half and is opened wide in device, and overcritical first
Alcohol is placed on batch reactor bottom；Described half opens wide device at the 0-1/2h of bottom, and h is that kettle is high, and half opens wide the appearance of device
The volume that product is greater than required addition coal tar ensures simultaneously so that coal tar must go up the top edge that liquid level opens wide device close to half
Coal tar and methanol cannot be contacted directly.
The coal tar is high temperature coal-tar, medium temperature coal tar or coalite tar.
The inert gas is nitrogen or argon gas, purge time 3-5min, it is ensured that air is replaced completely in kettle.
When temperature rises to 100 DEG C in batch reactor, blender opens stirring, stirring rate 500-1500rpm.
The heating rate of batch reactor is 15-30 DEG C/min, and after rising to reaction temperature, temperature fluctuation is ± 5 DEG C.
The gas that reaction generates described in step 7) is mainly H2、CH4、H2S and CO.
Liquid-solid phase product after cooling described in step 8) is separated into oil product and coke, and the specific method is as follows:
A) reaction terminates, and opens batch reactor, batch reactor autoclave body is heated, and top is condensed,
That is distillation procedure；The methanol steam to gasify in batch reactor at this time is cooled, and cooling liquid methanol is recovered, again sharp
With；
B) organic solvent, ultrasonic 30min, it is ensured that the liquid product in batch reactor are added in batch reactor
It is completely dissolved；Then the product in batch reactor is poured into the funnel with filter paper, lower section flask receives filtrate, burnt
Charcoal is retained due to being difficult to dissolve in organic solvent by filter paper；Filtering terminates, and filter paper builds up filter paper packet, with have filtrate
Flask be combined into Soxhlet extractor, when siphon liquid in pipe be it is colorless and transparent when, extracting terminates；
C) after extracting, the organic solvent in flask is rotated, remaining is oil product, the organic solvent of recycling
It re-uses；Substance after drying in filter paper packet is coke.
The organic solvent added in batch reactor is carbon disulfide, toluene or tetrahydrofuran.
The present invention is compared to the prior art compared with having the advantages that
1) supercritical fluid that uses of the present invention is supercritical methanol, and methanol is relative to dimethylbenzene, acetone and other organic solvent,
Cost is relatively low.And supercritical methanol solvability is strong, can sufficiently dissolve most of component in coal tar, destroy its stable glue
Body structure weakens the association between asphalitine micelle, coal tar oil ingredient is allowed sufficiently to carry out thermal cracking.
2) catalyst is not added in reaction process, is not passed through hydrogen to reaction kettle, and cost is relatively low.
3) current batch reactor can only carry out operation, not can be carried out later separation, the present invention is to intermittent reaction
Kettle installs one and half unlimited devices additional, and modification difficulty is low and easy realization, and the initial gross separation to product may be implemented.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart.
Fig. 2 is experimental provision schematic diagram of the present invention.
Fig. 3 a is general batch reaction kettle schematic diagram；Fig. 3 b is to install the half batch reactor schematic diagram for opening wide device additional.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Embodiment 1
Raw material coalite tar in the coal of Shan, feedstock property such as the following table 1, the embodiment are being not added with half unlimited device
It is carried out in batch reactor, the solvent of batch reactor is 200ml, stirs magnetic stir bar and the stirrer bottom of selection
Seat combines, and shown in batch reactor such as Fig. 3 (a), the volume of batch reactor is 200ml.Process is as shown in Figure 1, take 10g
Coal tar, 20g supercritical methanol is placed in batch reactor (i.e. alcohol oil rate be 2:1), bottom charging, i.e., without being added half
Open wide device.5min is purged with argon gas after sealing, it is ensured that is remained in kettle without air.Then temperature controller parameter is set, such as Fig. 2 institute
Show, batch reactor is placed in heating mantle, temperature in the kettle is heated to 400 DEG C from 20 DEG C of room temperature in 60min, is then existed
400 DEG C of holding 60min.When temperature in the kettle is raised to 100 DEG C, opening stirs the switch of pedestal, stirring rate 1000rpm.
To the end of reacting, reaction pressure at this time is recorded, then batch reactor is put into sink, is quickly cooled down, it is cold
But to after room temperature, gas reactor is collected with airbag.Batch reactor is opened, with methanol in Rotary Evaporators recycling kettle, methanol
The rate of recovery is 80% or so.Then the carbon disulfide of 50ml, ultrasonic 30min, it is ensured that intermittent are added in batch reactor
Component is dissolved in carbon disulfide as far as possible in reaction kettle.Ultrasound terminates, and liquid and residue in kettle pour into two layers of slow filter paper
It is filtered, then the flask A equipped with filtrate and the filter paper B with filter residue is assembled in Soxhlet extractor, when in siphon pipe
When liquid colorless, extracting terminates, and with the carbon disulfide in Rotary Evaporators recycling flask A, dry filter paper B is produced in flask A at this time
Object is oil product mproduct；Residue is coke on filter paper B, the yield m of poor quality for cokecoke。
Oil product is obtained by above-mentioned processing, yield and the hetero atom distribution of each boiling range are as shown in table 1.
Oil product according to boiling point distribution situation, can be divided into IBP-200 DEG C, 200-350 DEG C, 350-500 DEG C, 500-750 DEG C,
Greater than 750 DEG C, (IBP is initial boiling point to several boiling ranges, refers to oil product in Measurement of distilled process, first drips end of the condensate liquid from condenser
Fall the temperature that moment recorded).With the content of the oil product full range chromatograph measurement each boiling range section of oil product.Due to gasoline and bavin
The boiling point of oil is at 350 DEG C hereinafter, the fraction that therefore also will be less than 350 DEG C is defined as light oil.The yield calculating of various boiling ranges is as follows,
The quality of adding raw materials coal tar is moil, coal tar is m by supercritical methanol treated qualityproduct。
Yield=m of oil productproduct/moil× 100%
Coking yield=mcoke/moil× 100%
Light oil (IBP-350 DEG C) yield=m350℃/moil× 100%
Yield=m of the boiling rangeThe quality of the boiling range/moil× 100%
Embodiment 2
Embodiment 2 selection be coalite tar (same as Example 1) in the coal of Shan, addition coal tar oil quality, feed way,
Consersion unit and detection device are identical as example 1, the heating-up time, the reaction time, alcohol oil rate, product fraction distribution and miscellaneous element
Content such as table 1.From the point of view of embodiment 1 and embodiment 2, the yield relative raw material coal tar of light oil (IBP-350 DEG C) mentions significantly
It rises, 350-750 DEG C of boiling range (heavy constituent) yield illustrates after supercritical methanol is handled, coal tar in the presence of reducing to a certain degree
Realize lighting.Furthermore the content of N element reduces, and also demonstrates that coal tar has certain denitrification.
1 Examples 1 and 2 reaction condition of table and result compare
| Project | Raw material | Embodiment 1 | Embodiment 2 |
| Reaction temperature (DEG C) | 400 | 400 | |
| Reaction time (min) | 60 | 30 | |
| Stirring rate (rpm) | 1000 | 1000 | |
| Alcohol oil quality ratio | 2:1 | 3:1 | |
| Reaction pressure (MPa) | 10.5 | 18 | |
| N element content | 0.50% | 0.36% | 0.33% |
| C element content | 86.23% | 88.12% | 87.96% |
| H element content | 11.29% | 11.64% | 11.61% |
| IBP-350 DEG C of yield | 28.00% | 43.72% | 38.03% |
| 350-500 DEG C of yield | 50.00% | 50.05% | 54.09% |
| 500-750 DEG C of yield | 16.20% | 9.04% | 9.99% |
| Oil product yield | 115% | 107% | |
| Coking yield | 1.94% | 1.81% |
Embodiment 3-6
Embodiment 3-6 selection is coalite tar (same as Example 1) in the coal of Shan, adds coal tar oil quality, charging side
Formula, consersion unit, detection device are identical as example 1, the heating-up time, the reaction time, alcohol oil rate, product each boiling range yield
Such as table 2.The yield of light oil has relative to raw material coal tar and is promoted significantly in product, and 350-750 DEG C of boiling range (heavy constituent) is received
Rate illustrates after supercritical methanol is handled, coal tar realizes lighting in the presence of reducing to a certain degree.
2 example 3-6 reaction condition of table and product compare
| Project | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Reaction temperature (DEG C) | 400 | 350 | 350 | 350 |
| Reaction time (min) | 90 | 90 | 60 | 30 |
| Stirring rate (rpm) | 1000 | 1000 | 1000 | 1000 |
| Reaction pressure (MPa) | 7.8 | 16.8 | 6.1 | 12.2 |
| Alcohol oil rate | 1:1 | 3:1 | 1:1 | 2:1 |
| IBP-350 DEG C of yield | 42.74% | 40.66% | 34.40% | 36.50% |
| 350-500 DEG C of yield | 40.31% | 64.80% | 61.35% | 59.47% |
| 500-750 DEG C of yield | 10.29% | 10.47% | 12.12% | 12.26% |
| Coking yield | 3.52% | 1.80% | 0.98% | 0.48% |
| Oil product yield | 97.14% | 127.06% | 114.67% | 116.61% |
Embodiment 7-8
Embodiment 7 is the new alcohol petrochemical industry coal tar in Xinjiang to the selection of embodiment 8, adds coal tar oil quality, feed way, reaction
Equipment, detection device are identical as example 1, the heating-up time, the reaction time, alcohol oil rate, product fraction distribution content such as table 3.It produces
The yield of light oil has relative to raw material coal tar and is promoted significantly in object, and there are one for 350-750 DEG C of boiling range (heavy constituent) yield
Determine degree reduction, illustrates after supercritical methanol is handled, coal tar realizes lighting.
3 example 7-8 reaction condition of table and product compare
| Project | Embodiment 7 | Embodiment 8 | Raw material |
| Reaction temperature (DEG C) | 350 | 350 | |
| Reaction time (min) | 30 | 30 | |
| Stirring rate (rpm) | 1000 | 1000 | |
| Alcohol oil rate | 2:1 | 6:1 | |
| IBP-200 DEG C of yield | 6.34% | 8.69% | 5.00% |
| 200-350 DEG C of yield | 37.06% | 40.37% | 36.00% |
| 350-500 DEG C of yield | 33.65% | 35.77% | 36.00% |
| 500-750 DEG C of yield | 20.48% | 17.37% | 23.00% |
| Gas yield | 6.58% | 4.74% | |
| Oil yield | 97.52% | 102.19% | 99.18% |
Embodiment 9-10
Embodiment 9 and the selection of embodiment 10 are coalite tar (same as Example 1) in the coal of Shan, addition coal tar oil
Amount, consersion unit and detection device are identical as example 1.Feed way is different, and coal tar is added spacious half in example 9 and example 10
In opening apparatus, and methanol is added directly into bottom, shown in batch reactor such as Fig. 3 (b).After reaction, embodiment 9 and reality
Example 10 is applied, product oil product is distributed in bottom and half and opens wide in device.And embodiment 1 opens wide device, product oil due to being not added with half
Product, which are concentrated, to be divided in bottom.Specific distribution situation is as shown in table 4.
Half addition for opening wide device can not change supercritical methanol to the modification effect of coal tar, but will affect product coal
The distribution situation of tar, integrated distribution open wide in device in bottom and half.From embodiment 9 it can be seen that
1) for light oil (IBP-350 DEG C), 92.1% is distributed in bottom, 7.9%, which is distributed in half, opens wide in device.
2) for boiling range (350-500 DEG C), 10.7% is distributed in bottom, 89.3%, which is distributed in half, opens wide in device.
3) for boiling range (500-750 DEG C), 12.6% is distributed in bottom, 87.4%, which is distributed in half, opens wide in device.
Light oil (IBP-350 DEG C) overwhelming majority is distributed in bottom, and other heavy constituents (350-500 DEG C, 500-750 DEG C) are exhausted
Major part is distributed in half and opens wide in device, that is, realizes the initial gross separation of coal tar.And it is being not added with half reaction for opening wide device
In system, product integrated distribution bottom, light oil and other heavy constituents are mixed, at this point, batch reactor is only to provide
Reaction compartment.And half batch reactor for opening wide device is added, reaction compartment can be not only provided, but also can be with initial gross separation
Coal tar oil product reduces the energy consumption of subsequent operation.
4 example 9-10 reaction condition of table and product compare
Claims (9)
1. the coal tar Method for treatment of oil based on supercritical methanol, characterized by the following steps:
1) coal tar is preheated, makes it have certain mobility；
2) coal tar and supercritical methanol are separately added into batch reactor and are sealed batch reactor, wherein overcritical
The mass ratio of methanol and coal tar is 0.5:1~3:1；
3) batch reactor is purged with inert gas, replaces air pocket in kettle；
4) batch reactor heating-up time and heating rate are controlled, the residence time is 30 when temperature reaches 350 DEG C~450 DEG C
~90min, pressure is 50~250bar in kettle；
5) blender is stirred in batch reactor, so that mixture is uniformly dispersed in batch reactor；
6) batch reactor after reaction, is put into quenching in sink；
7) gas that reaction generates is collected or handles emptying；
8) liquid-solid phase product after cooling is separated into oil product and coke；
9) reaction kettle and blender are cleaned.
2. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: step 2) is described
Coal tar and supercritical methanol are separately added into batch reactor there are two types of feed way: the first, by coal tar and
Supercritical methanol is separately added into batch reactor, and the two sequence does not require, i.e., bottom feeds；Second, intermittent
Half is placed in reaction kettle and opens wide device, and coal tar is placed on half and is opened wide in device, and supercritical methanol is placed on batch reactor
Bottom；Described half opens wide device at the 0-1/2h of bottom, and h is that kettle is high, and half volume for opening wide device is greater than required addition coal tar
The volume of oil so that coal tar, which must go up liquid level, opens wide the top edge of device close to half, while ensuring that coal tar and methanol cannot be straight
Contact.
3. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: the coal tar
For high temperature coal-tar, medium temperature coal tar or coalite tar.
4. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: the indifferent gas
Body is nitrogen or argon gas, purge time 3-5min, it is ensured that air is replaced completely in kettle.
5. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: when intermittent anti-
Temperature in the kettle is answered to rise to 100 DEG C, blender opens stirring, stirring rate 500-1500rpm.
6. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: batch reactor
Heating rate be 15-30 DEG C/min, after rising to reaction temperature, temperature fluctuation be ± 5 DEG C.
7. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: step 7) is described
Reaction generate gas be mainly H2、CH4、H2S and CO.
8. the coal tar Method for treatment of oil according to claim 1 based on supercritical methanol, it is characterised in that: step 8) is described
Liquid-solid phase product after cooling be separated into oil product and coke the specific method is as follows:
A) reaction terminates, and opens batch reactor, batch reactor autoclave body is heated, top is condensed, that is, is steamed
Evaporate operation；The methanol steam to gasify in batch reactor at this time is cooled, and cooling liquid methanol is recovered, and re-uses；
B) organic solvent, ultrasonic 30min, it is ensured that the liquid product in batch reactor is complete are added in batch reactor
Dissolution；Then the product in batch reactor is poured into the funnel with filter paper, lower section with flask receive filtrate, coke by
In being difficult to dissolve in organic solvent, therefore retained by filter paper；Filtering terminates, and filter paper builds up filter paper packet, with the burning for having filtrate
Bottle is combined into Soxhlet extractor, and when siphon liquid in pipe is colorless and transparent, extracting terminates；
C) after extracting, the organic solvent in flask is rotated, remaining is oil product, and the organic solvent of recycling is again
It utilizes；Substance after drying in filter paper packet is coke.
9. the coal tar Method for treatment of oil according to claim 8 based on supercritical methanol, it is characterised in that: described toward interval
The organic solvent added in formula reaction kettle is carbon disulfide, toluene or tetrahydrofuran.
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| CN113789191A (en) * | 2021-09-13 | 2021-12-14 | 延安大学 | Heavy oil viscosity reducing and desulfurizing method based on supercritical methanol |
| CN114989852A (en) * | 2022-07-14 | 2022-09-02 | 太原理工大学 | Method and equipment for improving yield of oil shale pyrolysis oil |
| CN115505417A (en) * | 2022-09-20 | 2022-12-23 | 西安交通大学 | Pretreatment solvent for medium and low temperature coal tar, and preparation method and application thereof |
| CN115838600A (en) * | 2022-12-07 | 2023-03-24 | 陕西延长石油（集团）有限责任公司 | Supercritical carbon dioxide mixed coal tar pretreatment viscosity reduction and impurity removal system and method |
| CN115893372A (en) * | 2023-01-03 | 2023-04-04 | 中国石油大学(华东) | Method for preparing carbon microspheres from pitch depolymerized by supercritical methanol and application of carbon microspheres |
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| CN113789191A (en) * | 2021-09-13 | 2021-12-14 | 延安大学 | Heavy oil viscosity reducing and desulfurizing method based on supercritical methanol |
| CN114989852A (en) * | 2022-07-14 | 2022-09-02 | 太原理工大学 | Method and equipment for improving yield of oil shale pyrolysis oil |
| CN115505417A (en) * | 2022-09-20 | 2022-12-23 | 西安交通大学 | Pretreatment solvent for medium and low temperature coal tar, and preparation method and application thereof |
| CN115838600A (en) * | 2022-12-07 | 2023-03-24 | 陕西延长石油（集团）有限责任公司 | Supercritical carbon dioxide mixed coal tar pretreatment viscosity reduction and impurity removal system and method |
| CN115893372A (en) * | 2023-01-03 | 2023-04-04 | 中国石油大学(华东) | Method for preparing carbon microspheres from pitch depolymerized by supercritical methanol and application of carbon microspheres |
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