CN106520195B - A kind of method for hydrogen cracking for improving boat coal quality - Google Patents
A kind of method for hydrogen cracking for improving boat coal quality Download PDFInfo
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Abstract
The present invention relates to refining arts, disclose a kind of method for hydrogen cracking for improving boat coal quality, and this method includes 1) being fractionated the liquid product from hydrocracking reaction area, obtains naphtha cut, kerosene distillate, diesel oil distillate and tail oil fraction；2) kerosene distillate that step 1) obtains is introduced kerosene fractionating column to be fractionated, obtain lightweight boat coal fraction, middle matter boat coal fraction and heavy boat coal fraction, the at least partly described middle matter boat coal fraction of extraction and the middle matter boat coal fraction of lightweight boat coal fraction, heavy boat coal fraction and optional remainder is gone out into device as the product of coal that navigates.Method provided by the invention can be economical and neatly effectively improves the boat coal quality of hydrocracking unit.
Description
Technical field
The present invention relates to refining arts, and in particular, to a kind of method for hydrogen cracking for improving boat coal quality.
Background technology
The sustainable development of Chinese national economy promotes the rapid raising of traffic capacity, recent air transportation fuel
Demand is also increasing.The available sources of usually boat coal fraction mainly have：The kerosene distillate obtained through distilling apparatus is taken off
Mercaptan；Decompressed wax oil produces boat coal by hydrocracking process.The boat coal fraction obtained through distilling apparatus is because being subject to crude oil to process
The limitation of ability and the coal fraction yield that navigates, yield are relatively fixed；And heavy distillate can be converted by hydrocracking process
Light-end products by adjusting operation, improves the means such as the selectivity of catalyst and the improvement of technological process, and boat yield of coal can be real
Present flexible variation interior in a big way.
Hydrocracking process can obtain stone using inferior raw materials such as decompressed wax oil, wax tailings and FCC light cycle oils as charging
The products such as cerebrol, intermediate oil (including boat coal and diesel oil) and tail oil, but its navigate coal quality and feed properties, reactive hydrogen point
The duration of runs of pressure, conversion level and device is closely related.
Under normal conditions, raw material in poor quality, conversion level reduction can all cause coal quality variation of navigating, and smoke point reduces, especially
To operating latter stage, this elementary reaction temperature drift, catalyst aromatic hydrocarbons saturation hydraulic performance decline, boat coal smoke point declines apparent compared with initial stage.
For existing hydrocracking unit, reaction hydrogen partial pressure, technological process is relatively fixed, conversion level also would generally
Since subsequent fractionation system there are bottleneck is difficult to significantly adjust, under the apparent main trend of feed properties in poor quality trend, such as
What improves its coal smoke point that navigates, and the boat coal smoke point for especially improving operating latter stage is a urgent problem to be solved.
CN103013559A discloses a kind of method for improving and being hydrocracked boat output of coal, and this method includes evaporating heavy diesel fuel
Point carry out that the reaction was continued together back to feedstock oil, wherein cycling heavy diesel fuel fraction and accounting for the mass percent of gross weight diesel oil distillate and be
10%~100%.This method can increasing of aviation kerosene yield, but fail to propose the side for being effectively improved existing boat coal quality on the original basis
Case.
US4172815 disclose and meanwhile produce jet fuel and the single hop of diesel oil cycle method for hydrogen cracking, raw material just
It evaporates and is a little more than 500 ℉ (about 260 DEG C).Its technological process is briefly described as follows：Feedstock oil is more than by being hydrocracked in pressure
It is reacted under the reaction condition of 1000psig (about 6.9Mpa), reaction effluent obtains naphtha cut, jet fuel by fractionation
Fraction, diesel oil distillate and tail oil, jet fuel fraction are completely or partially mixed with tail oil, send cracking reaction area back to.This method exists
Under the hydrocracking condition more mitigated, can reach and meanwhile maximum production jet fuel and diesel oil purpose, the quality for the coal that navigates
Also improved.This method relates to design of the Xun Huan boat coal fraction so as to improve boat coal quality, but cycles one side of boat coal fraction
Face can increase energy consumption, on the other hand can also improve total air speed of reaction, have negative effect to hydrocracking reaction；It is being hydrocracked
Device operates latter stage, and catalyst performance is already below initial stage, and reaction temperature is higher, without big adjustment space, therefore follows
Entirety may be influenced after circumaviate coal fraction, raising air speed and is hydrocracked effect, be not necessarily suitable existing hydrocracking unit.
CN1224678C discloses a kind of method for producing boat coal, and first after hydrogenated cracking, separation hydrogenation is split heavy charge
Change reaction production object and obtain intermediate oil, which through hydrogenated processing, separates hydrotreating reaction with lightweight material
Reaction product obtain purpose product：Navigate coal, and fresh hydrogen can add to hydrocracking reaction area and/or hydrotreating reaction
Area.The invention can produce the qualified boat coal of the indexs such as smoke point, arene content, but the technique under relatively low reaction pressure
Method cannot directly obtain qualified boat coal on hydrocracking unit, it is still necessary to be refined with virgin kerosene mixed hydrogenation.
The scheme prior art discloses production boat coal under the conditions of a kind of middle pressure of Application No. 00110437.3, is pressed in this
Supplement hydrogen needed for hydrocracking process passes through a kerosene hydrogenation under hydrocatalyst for saturating and hydrogenation saturation conditions first
Saturation unit, then enters back into middle pressure hydrocracking unit, and the raw material of described kerosene hydrogenation saturation comes from fractionating column distillate
The part navigated in coal fraction, in the effluent of kerosene hydrogenation saturation unit, gas goes successively to medium pressure hydrogenation as supplement hydrogen
Cracking Unit, product liquid are directly entered above-mentioned fractionating column.The invention can produce the indexs such as smoke point, arene content in middle pressure
Qualified boat coal, but need to increase a kerosene hydrogenation saturation unit in the process, increase in the higher reaction zone of pressure
Feeder apparatus counter investment is larger.
CN101280221A discloses a kind of hydrogenation conversion method for poor ignition quality fuel distillate, and core content is to set up
Two kerosene hydrogenation refining reaction areas, and the area is isolated with original region that is hydrocracked are hydrocracked to original
The boat further hydrofinishing of coal fraction obtains qualified products.The diesel oil distillate that the invention can be used for processing inferior obtains qualified boat
Coal, but need to increase a kerosene hydrogenation saturation unit in the process, increase device relative difficult in higher reaction zone.
It summarizes current technology and improves the smoke point of boat coal mainly including following 2 points：(1) the Xun Huan boat full fraction of coal, to the coal that navigates
Fraction is further hydrogenated with, so as to improve boat coal smoke point；(2) the second hydrofining reaction area is set up, is satisfied to the boat full fraction of coal
With it is refined, so as to improve boat coal smoke point.
Said program can effectively improve boat coal quality, but there is also shortcomings：(1) boat coal circulate operation can be increased
Additional operating cost；In addition, Xun Huan boat coal will increase total air speed, there is negative effect to reaction system, especially at reaction end
Phase, catalyst activity significantly decline, and it is relatively large to improve air speed meeting systematic influence；(2) setting up second reaction zone then needs to increase
Add additional high pressure reaction assembly, investment is larger.
The content of the invention
The defects of the purpose of the present invention is overcoming the prior art, provide it is a kind of it is more economical, improve boat coal quality for greater flexibility
Method for hydrogen cracking.
To achieve these goals, the present invention provides a kind of method for hydrogen cracking for improving boat coal quality, and this method includes：
1) liquid product from hydrocracking reaction area is fractionated, obtains naphtha cut, kerosene distillate, diesel oil
Fraction and tail oil fraction；
2) kerosene distillate that step 1) obtains is introduced kerosene fractionating column to be fractionated, obtains lightweight boat coal fraction, middle matter
Navigate coal fraction and heavy boat coal fraction, extracts at least partly described middle matter boat coal fraction out and lightweight boat coal fraction, heavy navigate
The middle matter of coal fraction and optional remainder boat coal fraction goes out device as boat product of coal.
Method provided by the invention can effectively improve the boat coal quality of hydrocracking unit.It is hydrocracked with other raisings
Device boat coal quality method compare, extract out at least part in matter boat coal fraction only need to the boat coal gas stripper in fractionating system into
Row transformation, change is smaller, and cost is relatively low；On the other hand, which operating cost is relatively low, extracted amount can also according to device into
Expect and its be adjusted service cycle, relatively more flexibly.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is together for explaining the present invention, but be not construed as limiting the invention.Many equipment are omitted in figure, such as
Pump, heat exchanger, compressor etc., but this is well known to those of ordinary skill in the art.In the accompanying drawings：
Fig. 1 is the process flow diagram of the method according to the invention production boat coal.
Reference sign
1st, feedstock oil 2, hydrogen
3rd, hydrocracking reaction area 4, high-pressure separator
5th, low pressure separator 6, the first fractionating column
7th, naphtha cut 8, kerosene distillate
9th, diesel oil distillate 10, tail oil fraction
11st, kerosene fractionating column 12, lightweight boat coal fraction
13rd, middle matter boat coal fraction 14, heavy boat coal fraction
15th, pipeline 16, boat product of coal
Specific embodiment
The specific embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The present invention provides a kind of method for hydrogen cracking for improving boat coal quality, this method includes：
1) liquid product from hydrocracking reaction area is fractionated, obtains naphtha cut, kerosene distillate, diesel oil
Fraction and tail oil fraction；
2) kerosene distillate that step 1) obtains is introduced kerosene fractionating column to be fractionated, obtains lightweight boat coal fraction, middle matter
Navigate coal fraction and heavy boat coal fraction, extracts at least partly described middle matter boat coal fraction out and lightweight boat coal fraction, heavy navigate
The middle matter of coal fraction and optional remainder boat coal fraction goes out device as boat product of coal.
In the present invention, the hydrocracking reaction area refers to that feedstock oil can carry out the area of hydrocracking reaction herein
Domain, in this region feedstock oil and hydrogeneous logistics generation hydrogenation saturation, removing impurities matter and cracking reaction.
In the present invention, described " the middle matter boat coal of lightweight boat coal fraction, heavy navigate coal fraction and optional remainder
Fraction goes out device as boat product of coal " refer to, go out in the boat product of coal of device to contain or not contain the middle matter boat coal
Fraction, when the middle matter boat coal fraction of extraction is whole middle matter boat coal fractions, then the middle matter boat coal fraction of remainder is zero,
At this point, middle matter boat coal fraction is not contained in boat product of coal, if the middle matter that the middle matter boat coal fraction of extraction is part is navigated during coal fraction,
Then navigate the middle matter boat coal fraction containing remainder in product of coal.
Above-mentioned method for hydrogen cracking provided by the invention can significantly improve the quality for the boat coal that production obtains.It is carried with other
The method of high hydrocracking unit boat coal quality is compared, and extracting matter boat coal fraction at least part out only needs to the boat in fractionating system
Coal gas stripper is transformed, and change is smaller, and cost is relatively low；On the other hand, which operating cost is relatively low, and extracted amount can be with root
It is adjusted according to the charging and its service cycle of device, relatively more flexibly.
In the present invention, it is preferred to the cut point of the lightweight boat coal fraction and the middle matter boat coal fraction is 190-210 DEG C,
The cut point of the middle matter boat coal fraction and heavy boat coal fraction is 230-240 DEG C.More preferably described lightweight boat coal evaporates
Point and the cut point of middle matter boat coal fraction be 195-205 DEG C, the middle matter boat coal fraction and heavy boat coal fraction
Cut point is 232-238 DEG C.
A kind of preferred embodiment according to the present invention, the lightweight boat coal fraction and the middle matter boat coal fraction
Cut point for 200 DEG C, the cut point of the middle matter boat coal fraction and heavy boat coal fraction is 235 DEG C.
In the present invention, it is preferred to the cut point of the naphtha cut and the kerosene distillate is 130 DEG C；The kerosene evaporates
Divide and the cut point of the diesel oil distillate is 290 DEG C；The diesel oil distillate and the cut point of the tail oil fraction are 320 DEG C.More
Add under preferable case, in the present invention, the cut point of the naphtha cut and the kerosene distillate is 145 DEG C；The kerosene
The cut point of fraction and the diesel oil distillate is 270 DEG C；The diesel oil distillate and the cut point of the tail oil fraction are 320 DEG C.
Method of the present invention includes the gas-liquid mixed material for generating hydrocracking reaction area and carries out gas-liquid separation, obtains
To gas-phase product and liquid product, the gas-phase product can be introduced into reaction system after following process and be cycled, institute
State liquid product enter in fractionating column (in order to distinguish, the fractionating column also referred to as at this is the first fractionating column to the present invention below) into
Row fractionation, obtains naphtha cut, kerosene distillate, diesel oil distillate and tail oil fraction.Wherein, separation of the present invention can be
It is carried out in separator, the separator includes high-pressure separator and/or low pressure separator.
In the present invention, to the operation in the high-pressure separator, low pressure separator, the first fractionating column and kerosene fractionating column
There is no particular limitation for condition, and those skilled in the art can be according in the art after technical scheme has been understood
Conventional technical means selects suitable operating condition to be separated and be fractionated.This will not be detailed here by the present invention.
In the present invention, in order to more significantly improve the quality for the boat coal that production obtains, preferably described lightweight boat coal evaporates
The boiling range divided is 145-200 DEG C, and the boiling range of the middle matter boat coal fraction is the heavy boat coal higher than 200 DEG C and less than 235 DEG C
The boiling range of fraction is 235-270 DEG C.
In method of the present invention, the middle matter boat coal fraction and the weight for the boat product of coal for going out device preferably extracted out
Amount is than being 0.1-0.9：1.It was found by the inventors of the present invention that when the middle matter boat coal fraction extracted out and the boat product of coal for going out device
Weight ratio be 0.1-0.9：When 1, the smoke point of the boat coal of acquisition is high.
In method of the present invention, the middle matter boat coal fraction particularly preferably extracted out and the boat product of coal for going out device
Weight ratio be 0.18-0.44：1.It was found by the inventors of the present invention that when the middle matter boat coal fraction extracted out and the boat for going out device
The weight ratio of product of coal is 0.18-0.44：When 1, the smoke point of the boat coal of acquisition can be optimal.
According to the present invention, according to the flow direction of reaction stream, set gradually in preferably described hydrocracking reaction area containing plus
The weighted BMO spaces unit of hydrogen pretreatment catalyst, the Hydrocracking unit containing hydrocracking catalyst and refining after containing is urged
The rear refined unit of agent.
In the present invention, the weighted BMO spaces unit, the Hydrocracking unit and the rear refined unit can be
The different zones of different beds or same bed in different reactors or same reactor.
In the present invention, it is preferred to this method of the present invention includes feedstock oil and hydrogeneous logistics introducing hydrocracking reaction area
In successively with the hydrogenation pretreatment catalyst, the hydrocracking catalyst and it is described after catalyst for refining contact it is anti-
It should.
In the present invention, the hydrogeneous logistics refers to the logistics for being capable of providing hydrogen, including new hydrogen, recycle hydrogen, hydrogen rich gas
Body and other gaseous streams for being capable of providing hydrogen and other any one being capable of providing in the liquid phase stream of hydrogen or more
Kind.Those skilled in the art are after technical scheme has been understood it can be clearly understood that heretofore described is hydrogeneous
Logistics.
Method according to the present invention, to the reaction condition in the hydrocracking reaction area, there is no particular limitation, this
The method of invention adapts to conventional various hydrocracking conditions in the art, and those skilled in the art are understanding the side of the present invention
Suitable condition can be selected after case to carry out the method for the present invention.But it was found by the inventors of the present invention that when described in control
When the reaction condition in hydrocracking reaction area is in following scope, the smoke point higher of the boat coal produced.It is described to be hydrocracked
The reaction condition of reaction zone includes：Reaction temperature is 300-450 DEG C, hydrogen partial pressure 2.0-18.0MPa, hydrogen to oil volume ratio 300-
2000：1, volume space velocity 0.5-20h-1。
In the case of more preferably, in the present invention, the reaction condition in the hydrocracking reaction area includes：Hydrogen partial pressure is
10.0-18.0MPa。
The method of the present invention is to the species of the hydrogenation pretreatment catalyst, hydrocracking catalyst and rear catalyst for refining
And there is no particular limitation for admission space ratio, those skilled in the art being capable of root after technical scheme has been understood
According to the species and dress of conventional use of hydrogenation pretreatment catalyst, hydrocracking catalyst and rear catalyst for refining in the art
It fills out volume ratio to make choice, using conventional various hydrogenation pretreatment catalysts, hydrocracking catalyst and rear catalyst for refining
It can be realized as the foregoing goal of the invention of the present invention.
Under preferable case, the inventors found that during using following hydrocracking catalyst, the cigarette of the boat coal of acquisition
Higher is put, contains the carrier selected from least one of aluminium oxide, amorphous silica-alumina and zeolite in the hydrocracking catalyst
And the active component element of load on the carrier；The active component element includes precious metal element and/or your non-gold
Belong to element；The non-noble metal j element is group vib metallic element and/or group VIII metal element；
It is preferred that the group vib metallic element is Mo and/or W, the group VIII metal element is Co and/or Ni；It is described expensive
Metallic element is Pt elements and/or Pd elements.
In the present invention, the amorphous silica-alumina includes silica, aluminium oxide or combination thereof.
Under preferable case, in the present invention, the rear catalyst for refining in the hydrocracking reaction area includes carrier and bears
Active metal on the carrier is carried, the carrier includes amorphous alumina and/or sial；The active metal includes the
At least one of group vib base metal and group VIII base metal.Method according to the present invention, the carrier can be with
Including amorphous alumina and/or sial, common carrier or γ-Al2O3.The active metal can include Section VI B
At least one of race's base metal and group VIII base metal, common active metal can include in Mo, W, Co and Ni
At least one.
, according to the invention it is preferred to the hydrogenation pretreatment catalyst includes the activity gold of carrier and load on the carrier
Belong to element, the carrier includes amorphous alumina and/or sial；The active metallic element includes vib metals element
At least one of with group VIII metallic element.In the case of more preferably, in rear catalyst for refining of the present invention, institute
Group vib metallic element is stated as Mo and/or W, the group VIII metal element is Co and/or Ni.
In the present invention, one or more reactors can be included in the hydrocracking reaction area, each reactor can
To include one or more catalyst beds, each catalyst bed can load identical or different types of catalysis
Agent.
In the present invention, it is preferred to the boiling range of the feedstock oil is 180-635 DEG C；The μ g/g of sulfur content in feedstock oil≤50000,
The μ g/g of nitrogen content≤5000.
In the present invention, the μ g/g of μ g/g of sulfur content more preferably in the feedstock oil≤40000, nitrogen content≤2000.
In the present invention, the feedstock oil can include decompressed wax oil, wax tailings, catalytic cracking light cycle oil, de- drip
Blue or green oil and coal produce at least one of oil.
A kind of preferred embodiment according to the present invention, method of the invention is in technological process as shown in Figure 1
It is carried out in schematic diagram, it is specifically as follows：
It is pre- in hydrogenation into hydrocracking reaction area 3 after feedstock oil 1 from pipeline is mixed with the hydrogen 2 from pipeline
It is reacted under the action of processing catalyst, hydrocracking catalyst and rear catalyst for refining, reaction effluent enters high pressure
Separator 4 carries out gas-liquid separation, and the liquid phase stream of 4 bottom of high-pressure separator enters low pressure separator 5, carries out herein further
Gas-liquid separation；The liquid product of 5 bottom of low pressure separator enters the first fractionating column 6.Liquid product into the first fractionating column 6 passes through
After fractionation, cut into naphtha cut 7, kerosene distillate 8, diesel oil distillate 9 and tail oil fraction 10 and extracted out successively through pipeline.Kerosene evaporates
8 are divided to enter back into kerosene fractionating column 11, fractionation obtains lightweight boat coal fraction 12, middle matter boat coal fraction 13 and heavy boat coal fraction 14.
Matter boat coal fraction is extracted out through pipeline 15 at least part, and lightweight boat coal fraction, heavy boat coal fraction and optional remainder
The boat coal fraction mixing of middle matter after form boat product of coal 16 and go out device.
Specifically, the method described in the present invention further includes the advantages of following specific：
1st, using method provided by the invention, the cigarette of boat coal can be effectively improved under conditions of reaction system is not changed
Point；
2nd, compared with increase the second hydrofining reaction area of the prior art is so as to improve the mode of boat coal smoke point, the present invention
Method equipment investment and operating cost it is less；
3rd, compared with the full fraction boat coal of the Xun Huan freshening of the prior art is so as to improve the mode of boat coal smoke point, behaviour of the invention
It is lower to make expense；
4th, method of the invention can be used in the boat coal quality adjustment of hydrocracking unit latter stage, in catalyst activity reduction
In the case of, matter navigates coal fraction so as to improve boat coal quality in extracting out by the appropriate cutting to kerosene distillate and selectively, reaches
The target of the qualified boat coal of production.
The present invention will be described in detail by way of examples below.
In following embodiment and comparative example, in case of no particular description, used various raw materials are all from business
Purchase.
In the following Examples and Comparative Examples, used hydrogenation pretreatment catalyst is RN-32V；Hydrocracking catalyst
Agent is RHC-3, and rear catalyst for refining is RN-32V, and more than catalyst is by China Petrochemical Corp.'s catalyst Chang Ling point
Company produces.Its property of used feedstock oil is as shown in table 1.
Embodiment 1
Feedstock oil and hydrogen introducing are contained into hydrogenation pretreatment catalyst, hydrocracking catalyst and rear catalyst for refining
Hydrocracking reaction is reacted in area, and reaction condition is as shown in table 2；Then by the reaction effluent of the hydrocracking reactor
High-pressure separator is introduced successively and low pressure separator carries out gas-liquid separation, obtains liquid product, and the liquid product is introduced
It is fractionated in first fractionating column, obtaining naphtha cut, kerosene distillate, diesel oil distillate and tail oil fraction, (naphtha evaporates
Divide and the cut point of the kerosene distillate is 145 DEG C；The cut point of the kerosene distillate and the diesel oil distillate is 270 DEG C；Institute
The cut point of diesel oil distillate and the tail oil fraction is stated as 320 DEG C, similarly hereinafter).The kerosene distillate of acquisition is introduced into kerosene fractionating column
It is middle to be further fractionated, obtain lightweight boat coal fraction, middle matter boat coal fraction and heavy boat coal fraction (the lightweight boat coal fraction
Cut point with the middle matter boat coal fraction is 200 DEG C, the cut point of the middle matter boat coal fraction and heavy boat coal fraction
For 235 DEG C, similarly hereinafter), matter boat coal fraction in extraction section, and in lightweight boat coal fraction, heavy boat coal fraction and remainder
Boat product of coal, which is formed, after matter boat coal fraction mixing goes out device.Wherein, the weight of matter boat coal fraction and the product of coal that navigates in extraction section
Than for 0.21：1.0.The yield difference of product naphtha cut, product diesel oil distillate and product tail oil fraction is as shown in table 3,
And the property of boat product of coal is as shown in table 4.
Table 1
| Feedstock oil | |
| Density (15.6 DEG C)/(g.cm-3) | 0.93 |
| Sulfur nutrient/% | 3.5 |
| Nitrogen content/(μ g.g-1) | 1100 |
| Carbon residue/weight % | 0.6 |
| Asphalitine/(μ g.g-1) | 100 |
| Ni/V/(μg.g-1) | 0.4/0.8 |
| Total acid number/(mgKOH/g) | 0.23 |
| TBP (V%) | |
| IBP | 246 |
| 10 | 351 |
| 30 | 397 |
| 50 | 437 |
| 70 | 470 |
| 90 | 530 |
| 95 | 562 |
| EBP | 605 |
Table 2
Table 3
| Yield/weight % | Embodiment 1 | Embodiment 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Naphtha cut | 17.5 | 17.4 | 17.6 | 17.5 | 17.5 |
| Diesel oil distillate | 7.0 | 7.0 | 7.1 | 7.2 | 6.9 |
| Tail oil fraction | 39.5 | 39.5 | 39.3 | 39.2 | 39.7 |
Table 4
Embodiment 2
Feedstock oil and hydrogen are introduced into the hydrocracking reactor containing hydrocracking catalyst and rear catalyst for refining
It is reacted, reaction condition is as shown in table 2；Then the reaction effluent of the hydrocracking reactor is introduced into high pressure separation successively
Device and low pressure separator carry out gas-liquid separation, obtain liquid product, and the liquid product is introduced into the first fractionating column and is carried out
Fractionation, obtains naphtha cut, kerosene distillate, diesel oil distillate and tail oil fraction.The kerosene distillate of acquisition is introduced into kerosene fractionation
It is further fractionated in tower, obtains lightweight boat coal fraction, middle matter boat coal fraction and heavy boat coal fraction, extract matter in whole out and navigate
Coal fraction, and form boat product of coal after lightweight boat coal fraction and heavy boat coal fraction mixing and go out device.Wherein, the middle matter boat of extraction
The weight ratio of coal fraction and boat product of coal is 0.44：1.0, product naphtha cut, product diesel oil distillate and product tail oil fraction
Yield difference it is as shown in table 3, and navigate product of coal property it is as shown in table 4.
Comparative example 1
Feedstock oil and hydrogen are introduced into the hydrogenation containing hydrogenation pretreatment catalyst, Cracking catalyst and rear catalyst for refining
Cracking reaction is reacted in area, and reaction condition is in the same manner as in Example 1；Then the reaction of the hydrocracking reactor is flowed out
Object introduces high-pressure separator successively and low pressure separator carries out gas-liquid separation, obtains liquid product, and the liquid product is drawn
Enter and be fractionated in the first fractionating column, obtain naphtha cut, kerosene distillate, diesel oil distillate and tail oil fraction.By the coal of acquisition
Oil distillate goes out device, the yield of product naphtha cut, product diesel oil distillate and product tail oil fraction directly as boat product of coal
As shown in table 3 respectively, the property for the product of coal that navigates is as shown in table 4.
Comparative example 2
Feedstock oil and hydrogen introducing are contained into hydrogenation pretreatment catalyst, hydrocracking catalyst and rear catalyst for refining
It is reacted in hydrocracking reactor, reaction condition is (as shown in table 2) in the same manner as in Example 2；Then this is hydrocracked
The reaction effluent of reactor introduces high-pressure separator successively and low pressure separator carries out gas-liquid separation, obtains liquid product, and
And the liquid product is introduced into the first fractionating column and is fractionated, obtain naphtha cut, kerosene distillate, diesel oil distillate and tail oil
Fraction.The kerosene distillate of acquisition is introduced into kerosene fractionating column and is further fractionated, obtains lightweight boat coal fraction, middle matter boat coal
Fraction and heavy boat coal fraction, extract whole lightweights boat coal fractions out, and shape after middle matter boat coal fraction and heavy boat coal fraction mixing
Go out device into boat product of coal.Wherein, the lightweight boat coal fraction of extraction and the weight ratio for the product of coal that navigates are 0.74：1.0, product stone brain
The yield difference of oil distillate, product diesel oil distillate and product tail oil fraction is as shown in table 3, and the property such as table 4 for the product of coal that navigates
Shown in.
Comparative example 3
Feedstock oil and hydrogen introducing are contained into hydrogenation pretreatment catalyst, hydrocracking catalyst and rear catalyst for refining
It is reacted in hydrocracking reactor, reaction condition is (as shown in table 2) same as Example 2；Then this is hydrocracked instead
The reaction effluent of device is answered to introduce high-pressure separator and low pressure separator progress gas-liquid separation successively, obtains liquid product, and
The liquid product is introduced into the first fractionating column and is fractionated, naphtha cut, kerosene distillate, diesel oil distillate and tail oil is obtained and evaporates
Point.The kerosene distillate of acquisition is introduced into kerosene fractionating column and is further fractionated, obtains lightweight boat coal fraction, middle matter boat coal evaporates
Point and heavy navigate coal fraction, extract whole heavys boat coal fractions out, and formed after lightweight boat coal fraction and the boat coal fraction mixing of middle matter
Boat product of coal goes out device.Wherein, the heavy boat coal fraction of extraction and the weight ratio for the product of coal that navigates are 0.38：1.0, product naphtha
The yield difference of fraction, product diesel oil distillate and product tail oil fraction is as shown in table 3, and in the navigate property of product of coal such as table 4
It is shown.
From embodiment 1 and the result of comparative example 1, using same materials, same catalyst and same reaction conditions
Under, by matter boat coal fraction in extraction section, residue boat coal fraction goes out device as product boat coal can effectively improve boat coal
Smoke point.From the result of table 2-3, navigate coal facies ratio with the full fraction in comparative example, when in extraction section matter boat coal fraction with
The weight ratio of boat product of coal is 0.21：When 1, product boat coal smoke point can improve a unit.
From embodiment 2 and the result of comparative example 2, using same materials, same catalyst and same reaction conditions
Under, by being completely drawn out middle matter boat coal fraction rather than extraction lightweight boat coal fraction, the smoke point of boat coal can be effectively improved.
From the product cut boat coal facies ratio obtained after the extraction lightweight boat coal fraction in table 2-3, with comparative example 2, extract out in whole
The smoke point that matter boat coal fraction obtains product boat coal fraction can improve 2.3 units.
From embodiment 2 and the result of comparative example 3, using same materials, same catalyst and same reaction conditions
Under, by being completely drawn out middle matter boat coal fraction rather than extraction heavy boat coal fraction, the smoke point of boat coal can be effectively improved.
From the product cut boat coal facies ratio obtained after the extraction heavy boat coal fraction in table 2-3, with comparative example 3, extract out in whole
The smoke point that matter boat coal fraction obtains product boat coal fraction can improve 1.6 units.
In addition, the result of comparative example 1 and embodiment 2 can also be seen that the extracted amount of matter boat coal in improving, Ke Yijin
One step improves the smoke point of boat coal.From table 2-3, when the weight ratio of matter boat coal fraction and the product of coal that navigates in extraction is by 0.21：1 carries
Height is to 0.44：When 1 (having extracted matter boat coal fraction in whole out at this time), the smoke point for the coal that navigates can further increase a unit.
It can be seen that by comparison：The present invention method can effectively improve boat coal smoke point (smoke point is all higher than being equal to
26.0mm), moreover, compared with the prior art, method of the invention only needs to be transformed the boat coal gas stripper in fractionating system,
Change is smaller, and cost is relatively low；On the other hand, which operating cost is relatively low, extracted amount can also according to the charging of device and its
Service cycle is adjusted, relatively more flexibly.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, within the scope of the technical concept of the present invention, a variety of simple variants can be carried out to technical scheme, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that the specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (11)
1. a kind of method for hydrogen cracking for improving boat coal quality, which is characterized in that this method includes：
1) liquid product from hydrocracking reaction area is fractionated, obtains naphtha cut, kerosene distillate, diesel oil distillate
And tail oil fraction；
2) kerosene distillate that step 1) obtains is introduced kerosene fractionating column to be fractionated, obtains lightweight boat coal fraction, middle matter boat coal
Fraction and heavy boat coal fraction extract at least partly described middle matter boat coal fraction out and evaporate lightweight boat coal fraction, heavy boat coal
Point and the middle matter boat coal fraction of optional remainder go out device, the lightweight boat coal fraction and the middle matter as boat product of coal
The cut point of boat coal fraction is 190-210 DEG C, and the cut point of the middle matter boat coal fraction and heavy boat coal fraction is 230-
240℃。
2. according to the method described in claim 1, wherein, the middle matter boat coal fraction of extraction and the boat product of coal that goes out device
Weight ratio is 0.1-0.9：1.
3. according to the method described in claim 1, wherein, the middle matter boat coal fraction of extraction and the boat product of coal that goes out device
Weight ratio is 0.18-0.44：1.
4. according to the method described in any one in claim 1-3, wherein, according to the flow direction of reaction stream, the hydrogenation is split
Change and the weighted BMO spaces unit containing hydrogenation pretreatment catalyst, adding containing hydrocracking catalyst are set gradually in reaction zone
Hydrogen Cracking Unit and the rear refined unit containing rear catalyst for refining.
5. according to the method described in claim 4, wherein, this method includes feedstock oil and hydrogeneous logistics introducing being hydrocracked anti-
It answers in area and is contacted successively with the hydrogenation pretreatment catalyst, the hydrocracking catalyst and the rear catalyst for refining
Reaction.
6. according to the method described in claim 4, wherein, the reaction condition in the hydrocracking reaction area includes：Reaction temperature
For 300-450 DEG C, hydrogen partial pressure 2.0-18.0MPa, hydrogen to oil volume ratio 300-3000：1, volume space velocity 0.3-20h-1。
7. contain according to the method described in claim 4, wherein, in the hydrocracking catalyst selected from aluminium oxide, amorphous
The active component element of the carrier and load of at least one of sial and zeolite on the carrier；The active component member
Element includes precious metal element and/or non-noble metal j element；The non-noble metal j element is group vib metallic element and/or VIII group
Metallic element.
8. according to the method described in claim 7, wherein, in the hydrocracking catalyst, the group vib metallic element is
Mo and/or W, the group VIII metal element are Co and/or Ni；The precious metal element is Pt elements and/or Pd elements.
9. according to the method described in claim 5, wherein, the boiling range of the feedstock oil is 180-635 DEG C；Sulfur content in feedstock oil
≤ 50000 μ g/g, the μ g/g of nitrogen content≤5000.
10. according to the method described in claim 9, wherein, μ g/g of sulfur content in the feedstock oil≤40000, nitrogen content≤
2000μg/g。
11. according to the method described in claim 5, wherein, the feedstock oil includes decompressed wax oil, wax tailings, catalytic cracking
Light cycle oil, deasphalted oil and coal produce at least one of oil.
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