CN105536854A - Method for preparing hydrocracking catalyst containing Y molecular sieve - Google Patents
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Abstract
The present invention discloses a method for preparing a hydrocracking catalyst containing a Y molecular sieve. The method comprises: 1, uniformly mixing a modified Y molecular sieve, amorphous silicon-aluminum and/or alumina according to a certain ratio, adding dilute nitric acid to form a slurry, carrying out strip extruding molding, drying, and calcining to obtain a silicon-aluminum carrier containing the modified Y molecular sieve; and 2, impregnating the carrier obtained in the step 1 by using an impregnating liquid containing an active metal, drying the impregnated carrier, and calcining to obtain the hydrocracking catalyst. According to the present invention, the prepared hydrocracking catalyst has characteristics of good temperature increasing sensitivity and good operation flexibility, and has broad application prospects in the hydrocracking reaction process.
Description
Technical field
The present invention relates to a kind of method preparing hydrocracking catalyst, relate to a kind of method preparing hydrocracking catalyst containing Y molecular sieve particularly.
Background technology
The features such as hydrocracking technology has that adaptability to raw material is strong, production operation and products scheme flexibility is large, good product quality, various heavy inferior charging can be converted into the high-quality jet fuel of market in urgent need, diesel oil, lube basestocks and chemical industry naphtha and tail oil preparing ethylene by steam cracking raw material, become one of modern oil refining and petro chemical industry most important heavy oil deep processing technique, obtain increasingly extensive application at home and abroad.The core of hydrocracking process is hydrocracking catalyst.Hydrocracking catalyst is typical bifunctional catalyst, has hydrogenation and cracking dual-use function.Wherein hydrogenating function has the sulphided state form of W, Mo, Ni isoreactivity metal to provide usually, and cracking function is then provided by molecular sieve.At China's hydrocracking technology because its raw material adapts to strong, the feature that product adjustability is large, therefore, usually adapted to the changes in demand in market as a kind of regulating measure by oil refining enterprise, when between Ru Dang city field alignment, distillate is in great demand, can fecund some midbarrels, then can voluminous heavy naphtha when market is in great demand to heavy naphtha, therefore, air speed on hydrocracking unit, in the relatively-stationary situation of the operating conditions such as pressure, the temperature raising sensitiveness of hydrocracking catalyst is particularly important for device flexible operating, in addition, for setter, because hydrogen supply is relatively fixing, therefore, the fluctuation of hydrogen gas consumption should be reduced as much as possible thus be more conducive to device even running while flexible operating in device temperature raising process, these are all that the research and development of hydrocracking catalyst are had higher requirement.
At present, hydrocracking process is the most widely used is modified Y molecular sieve, inside and outside conventional processing method molecular sieve, Distribution of silicon and aluminium is even, acid centre is uniformly distributed, and when reducing Y molecular sieve silica alumina ratio, improves Y molecular sieve acid site density, temperature raising sensitiveness is improved, but meanwhile, second pyrolysis also significantly increases, hydrogen consumption significantly promotes.And when carrying out advanced treating to Y molecular sieve, when sour density is too low, catalyst temperature raising sensitiveness is poor again.
CN200710158784.0 discloses a kind of hydrocracking catalyst containing Y molecular sieve and preparation method thereof, in this invention, Y zeolite obtains with after aluminium salt and sour mixed aqueous solution process hydrothermal treatment consists, obtained catalyst temperature raising sensitiveness is higher, but simultaneously, temperature raising process second pyrolysis obviously increases, hydrogen consumption significantly rises, and is unfavorable for the even running of industrial hydrocracking unit temperature raising process apparatus.
CN200810012212.6 discloses a kind of carrier of hydrocracking catalyst and preparation method thereof, and hydrocracking catalyst temperature raising sensitiveness prepared by this invention is poor.
Summary of the invention
For the deficiencies in the prior art, the present invention puies forward a kind of method preparing hydrocracking catalyst containing Y molecular sieve, hydrocracking catalyst prepared by the inventive method has good temperature raising sensitiveness and operating flexibility, has broad application prospects in hydrocracking reaction process.
Preparation of the present invention, containing the method for the hydrocracking catalyst of Y molecular sieve, comprises following content:
One, modified Y molecular sieve, amorphous silicon aluminium and/or aluminium oxide are mixed according to a certain ratio, add extruded moulding after dust technology pulping, dry, roasting obtains the silica-alumina supports containing modified Y molecular sieve; Wherein the concentration of dust technology is 3wt% ~ 30wt%; Described drying condition is: drying 1 ~ 5 hour at 80 ~ 120 DEG C; Roasting condition is: roasting 1 ~ 5 hour at 400 ~ 700 DEG C;
Two, adopt the carrier of maceration extract to step one containing active metal to flood, the carrier drying after dipping, roasting, obtain hydrocracking catalyst; Described active metal is selected from group VIII in the periodic table of elements and/or group vib metallic element, and group VIII active metal can be Ni and/or Co, and group vib active metal can be W and/or Mo; The liquid-solid ratio of wherein flooding is 1.5:1 ~ 3:1, the mode of saturated dipping well known in the art is adopted to carry out, in maceration extract, the content of group vib metallic compound counts 20 ~ 60g/100ml by corresponding oxide, the content of group VIII metallic compound counts 3 ~ 20g/100ml by corresponding oxide, and in maceration extract, the concentration of metallic compound can adjust accordingly according to product needed; Wherein said drying condition is: drying 2 ~ 8 hours at 90 ~ 150 DEG C; Roasting condition is: roasting 1 ~ 5 hour at 400 ~ 700 DEG C;
The preparation method of described modified Y molecular sieve, comprises following content:
(1) be that former powder carries out Ammonium Salt Ionic exchange in ammonium salt aqueous solution with NaY zeolite;
(2) hydrothermal treatment consists is carried out to the Y molecular sieve after the ammonium exchange obtained in step (1);
(3) acid treatment is carried out to the Y molecular sieve that step (2) obtains;
(4) to the Y molecular sieve drying process of step (3) gained;
(5) Y molecular sieve that step (4) obtains floods in organic solvent, then rapid draing;
(6) molecular sieve that step (5) obtains is carried out alkali desiliconization process;
(7) Y molecular sieve of step (6) after alkali desiliconization process after filtration, dry, calcination process obtains modified Y molecular sieve.
Described in step (1), Ammonium Salt Ionic exchange process is as follows: with NaY zeolite be raw material in ammonium salt aqueous solution, at 60 ~ 120 DEG C, preferably at 60 ~ 90 DEG C, exchange 1 ~ 3 hour, exchange times is 1 ~ 4 time, obtains the NaY zeolite after exchanging, Na
2o content is less than 3.0%; The wherein SiO of NaY zeolite raw material
2/ Al
2o
3mol ratio is 3 ~ 6, sodium oxide molybdena mass percentage 6% ~ 7%; Ammonium salt is one or more in ammonium chloride, ammonium nitrate, ammonium sulfate, ammonium acetate or ammonium oxalate, ammonium salt aqueous solution concentration 0.3 ~ 6.0mol/L, preferably 1.0 ~ 3.0mol/L.
Step (2) described hydrothermal treatment process be self steam or pass into steam condition under, hydrothermal conditions is: temperature is 500 ~ 600 DEG C, and pressure is 0.01 ~ 0.5MPa, and the processing time is 1.0 ~ 6.0 hours.
Sour dealumination treatment process described in step (3) is conventional method, namely uses the Y molecular sieve that inorganic acid and/or organic acid mixed solution treatment step (2) obtain.The inorganic acid that step (3) acid treatment process uses or organic acid are one or more in sulfuric acid, hydrochloric acid, nitric acid, citric acid, oxalic acid or acetic acid, and inorganic acid and/or organic acid concentration are with H
+count 0.4 ~ 2.0mol/L, preferably 0.7 ~ 1.5mol/L; Gu the liquid/mass ratio of acid dealumination treatment process is 3:1 ~ 30:1; Treatment temperature 60 ~ 120 DEG C; Processing time is 0.5 ~ 3 hour.
Dried journey described in step (4): 90 ~ 300 DEG C of drying 2 ~ 10h.
Organic solvent described in step (5) is selected from one or more in alkane, benzinum, carbon tetrachloride, benzene, toluene, ethylbenzene, dimethylbenzene, ethylbenzene, and impregnation method adopts supersaturation dipping, and dip time is 1 ~ 5 hour; Baking temperature is 50 ~ 300 DEG C, and preferred baking temperature is higher than the boiling point of organic solvent, and drying time is 1 ~ 60 minute, preferably 3 ~ 20 minutes.
The aqueous solution that the alkali lye that alkali desiliconization processing procedure described in step (6) uses is NaOH or potassium hydroxide, wherein the concentration of alkali lye is 0.1wt% ~ 2wt%.Base extraction temperature 50 ~ 100 DEG C, the processing time is 0.5 ~ 4 hour, and the liquid-solid mass ratio of alkali lye/molecular sieve is 5:1 ~ 10:1.
Step (7) described drying condition is 90 DEG C ~ 120 DEG C, 2 ~ 4h; Roasting condition is 400 ~ 600 DEG C, 2 ~ 4 hours.
Hydrocracking catalyst prepared by the inventive method, with overall catalyst weight gauge, comprises following component: containing the silica-alumina supports 55% ~ 85% of modified Y molecular sieve, active metal 15% ~ 45%, and wherein active metal is with metal oxide; The mass percent of wherein said modified Y molecular sieve in silica-alumina supports is 15% ~ 90%, preferably 30% ~ 70%, and surplus is amorphous aluminum silicide and/or aluminium oxide; Modified Y molecular sieve lattice constant is 2.425 ~ 2.455nm; (silica alumina ratio as herein described is SiO to body phase silica alumina ratio
2/ Al
2o
3mol ratio) be 10 ~ 60, preferably 20 ~ 40, superficial layer silica alumina ratio 7 ~ 30, preferably 9 ~ 20, superficial layer silica alumina ratio is lower than body phase silica alumina ratio 8 ~ 40, and wherein said superficial layer refers to the thickness range of molecular sieve outer surface to inner 5 ~ 400nm, preferably 10 ~ 200nm, more preferably 50 ~ 190nm, superficial layer is primary in Y molecular sieve crystal grain before modified; Sodium oxide molybdena is less than 1.0wt%, is preferably less than 0.5wt%; Modified Y molecular sieve specific area 600 ~ 800m
2/ g, pore volume 0.40 ~ 0.70ml/g; Meleic acid content 0.3 ~ 1.5mmol/g, preferably 0.4 ~ 1.2mmol/g; Relative crystallinity 70% ~ 110%;
Hydrocracking catalyst of the present invention can be applicable to produce flexibly industrial chemicals or intermediate oil etc. different hydrocracking reaction process, general operational requirement(GOR) is: reaction pressure 6.0 ~ 20.0MPa, reaction temperature 350 ~ 420 DEG C, feed volume air speed 0.1 ~ 2.0h
-1, hydrogen to oil volume ratio is 500:1 ~ 2000:1.
The present invention is by carrying out modification to Y molecular sieve, namely first flood with in organic solvent not soluble in water, then be rapidly heated drying, the outer organic solvent of rapid removing molecular sieve, thus remain the organic solvent of molecular sieve inside, therefore, in follow-up alkali treatment process, mainly carry out on the outer surface, after alkali-treated, the organic solvent of dry removing molecular sieve inside.The inventive method is by optionally carrying out alkali desiliconization process to Y molecular sieve outer surface, while the inner high silica alumina ratio of reservation molecular sieve, optionally reduce the silica alumina ratio of Y molecular sieve outer surface, improve the acid centre of molecular sieve outer surface, the hydrocracking catalyst prepared compared to conventional method modified molecular screen can significantly improve temperature raising sensitiveness, the operating flexibility of catalyst, and same conversion lower device liquid is received and chemical hydrogen consumption all makes moderate progress.
Accompanying drawing explanation
Fig. 1 is transmission electron microscope (TEM) photo of modified Y molecular sieve prepared by embodiment 1.
Detailed description of the invention
Below by embodiment, the present invention is further described, but therefore do not limit the present invention.
embodiment 1
Molecular sieve modified processing procedure:
(1) get the former powder 200g of NaY molecular sieve prepared by laboratory, be that the ammonium nitrate of 0.5mol/L mixes according to liquid-solid ratio 3:1 by concentration, 70 DEG C exchange 3 hours, and repeat this process 3 times, in the Y molecular sieve after exchange, Na content is with Na
2o counts 2.5%;
(2) to the Y molecular sieve 570 DEG C that step (1) obtains, hydrothermal treatment consists 2 hours under 0.1MPa;
(3) (concentration is with H according to the hydrochloric acid solution of liquid-solid ratio 10:1 and concentration 0.6mol/L for the molecular sieve of step (2) gained
+meter) mixing, constant temperature process 2 hours at 80 DEG C;
(4) step (3) gained molecular sieve 150 DEG C of dry 4h;
(5) molecular sieve 2 hours of normal heptane solvent soaking step (4) gained is got;
(6) molecular sieve after step (5) process was in 130 DEG C of dryings 8 minutes;
(7) step (6) gained Y molecular sieve according to liquid-solid ratio 5:1 with 0.7% sodium hydroxide solution mix, 90 DEG C process 2 hours;
(8) Y molecular sieve after step (7) alkali treatment, 120 DEG C of dryings 2 hours, 550 DEG C of roastings, after 2 hours, obtain modified Y molecular sieve, are numbered Y-1.
Y-1 molecular sieve transmission electron microscope EDAX results measures its outer surface to 80nm thickness SiO
2/ Al
2o
3mol ratio is 14, molecular sieve SiO
2/ Al
2o
3mol ratio is 25.XRD analysis result shows that its lattice constant is 2.435nm, relative crystallinity 88%.Pore volume 0.44ml/g, specific area 700m
2/ g, it is 0.69mmol/g that infrared analysis result measures Y-1 meleic acid amount.
Hydrocracking catalyst preparation process:
(1) W-Ni dipping solution is configured: get after ammonium metatungstate 430g and nickel nitrate 440g is dissolved in water and configure 1000ml dipping solution, in gained dipping solution, active metal is with WO
336g/100ml and 11g/100ml is respectively, solution numbers RY-1 with NiO cubage;
(2) get the mixing of Y-155g and 45g macroporous aluminium oxide, add 4g/100ml dust technology and mix in a mixer and roll to extruding shape, on banded extruder, extruded moulding obtains carrier T-1;
(3) get T-160g and add 120mlRY-1 impregnation fluid 2 hours, then 120 DEG C of dryings 4 hours, 500 DEG C of roastings 3 hours, obtain hydrocracking catalyst, are numbered Cat-1.
embodiment 2
Molecular sieve modified processing procedure:
(1) get the former powder of NaY molecular sieve prepared by laboratory, be that the ammonium nitrate of 0.8mol/L mixes according to liquid-solid ratio 3:1 by concentration, 70 DEG C exchange 3 hours, and repeat this process 3 times, in the Y molecular sieve after exchange, Na content is with Na
2o counts 2.0%.
(2) to the Y molecular sieve 600 DEG C that step (1) obtains, hydrothermal treatment consists 3 hours under 0.1MPa;
(3) molecular sieve of step (2) gained is according to liquid-solid ratio 7:1 and H
+concentration is the hydrochloric acid mixed solution mixing of 1.0mol/L, and 95 DEG C process 2 hours;
(4) step (3) gained molecular sieve 250 DEG C of dry 2h;
(5) molecular sieve 3 hours of toluene solvant soaking step (4) gained is got;
(6) molecular sieve 130 DEG C of dryings after step (5) process 25 minutes;
(7) step (6) gained molecular sieve according to liquid-solid ratio 6:1 with 1.2% sodium hydroxide solution mix, 80 DEG C process 3 hours;
(8) Y molecular sieve after step (7) alkali treatment, 120 DEG C of dryings 2 hours, 550 DEG C of roastings, after 2 hours, obtain modified Y molecular sieve, are numbered Y-2.
Hydrocracking catalyst preparation process:
(1) W-Ni dipping solution is configured: get after ammonium metatungstate 480g and nickel nitrate 480g is dissolved in water and configure 1000ml dipping solution, in gained dipping solution, active metal is with WO
340g/100ml and 12g/100ml is respectively, solution numbers RY-2 with NiO cubage;
(2) get the mixing of Y-245g and 55g macroporous aluminium oxide, add 4g/100ml dust technology and mix in a mixer and roll to extruding shape, on banded extruder, extruded moulding obtains carrier T-2;
(3) get T-260g and add 120mlRY-2 impregnation fluid 2 hours, then 120 DEG C of dryings 4 hours, 500 DEG C of roastings 3 hours, obtain hydrocracking catalyst, are numbered Cat-2.
Y-2 molecular sieve transmission electron microscope EDAX results measures its outer surface to 150nm thickness, the SiO of superficial layer
2/ Al
2o
3mol ratio is 7.0, molecular sieve SiO
2/ Al
2o
3mol ratio is 31.XRD analysis result shows that its lattice constant is 2.427nm, relative crystallinity 89%.Pore volume 0.50ml/g, specific area 660m
2/ g, it is 0.58mmol/g that infrared analysis result measures Y-2 meleic acid amount.
embodiment 3
Molecular sieve modified processing procedure:
(1) get the former powder of NaY molecular sieve prepared by laboratory, be that the ammonium nitrate of 0.6mol/L mixes according to liquid-solid ratio 3:1 by concentration, 80 DEG C exchange 2 hours, and repeat this process 3 times, in the Y molecular sieve after exchange, Na content is with Na
2o counts 2.3%.
(2) to the Y molecular sieve 590 DEG C that step (1) obtains, hydrothermal treatment consists 2 hours under 0.1MPa;
(3) molecular sieve of step (2) gained is according to liquid-solid ratio 5:1 and H
+concentration is the hydrochloric acid mixed solution mixing of 1.2mol/L, and 80 DEG C process 2 hours;
(4) step (3) gained molecular sieve 150 DEG C of dry 6h;
(5) molecular sieve 4 hours of xylene solvent soaking step (4) gained is got;
(6) molecular sieve 200 DEG C of dryings after step (5) process 30 minutes;
(7) step (6) gained molecular sieve according to liquid-solid ratio 7:1 with 1.0% sodium hydroxide solution mix, 75 DEG C process 2 hours;
(8) Y molecular sieve after step (7) alkali treatment, 120 DEG C of dryings 2 hours, 550 DEG C of roastings, after 2 hours, obtain modified Y molecular sieve, are numbered Y-3.
Hydrocracking catalyst preparation process:
(1) W-Ni dipping solution is configured: get after ammonium metatungstate 480g and nickel nitrate 480g is dissolved in water and configure 1000ml dipping solution, in gained dipping solution, active metal is with WO
340g/100ml and 12g/100ml is respectively, solution numbers RY-3 with NiO cubage;
(2) get the mixing of Y-345g and 55g macroporous aluminium oxide, add 4g/100ml dust technology and mix in a mixer and roll to extruding shape, on banded extruder, extruded moulding obtains carrier T-3;
(3) get T-360g and add 120mlRY-3 impregnation fluid 2 hours, then 120 DEG C of dryings 4 hours, 500 DEG C of roastings 3 hours, obtain hydrocracking catalyst, are numbered Cat-3.
Y-3 molecular sieve transmission electron microscope EDAX results measures its outer surface to 180nm thickness, the SiO of superficial layer
2/ Al
2o
3mol ratio is 8.0, molecular sieve SiO
2/ Al
2o
3mol ratio is 30.XRD analysis result shows that its lattice constant is 2.432nm, relative crystallinity 90%.Pore volume 0.49ml/g, specific area 670m
2/ g, it is 0.60mmol/g that infrared analysis result measures Y-3 meleic acid amount.
embodiment 4
Molecular sieve modified processing procedure:
(1) get the former powder 200g of NaY molecular sieve prepared by laboratory, be that the ammonium nitrate of 0.6mol/L mixes according to liquid-solid ratio 3:1 by concentration, 70 DEG C exchange 2 hours, and repeat this process 3 times, in the Y molecular sieve after exchange, Na content is with Na
2o counts 2.6%;
(2) to the Y molecular sieve 560 DEG C that step (1) obtains, hydrothermal treatment consists 2 hours under 0.1MPa;
(3) (concentration is with H according to the hydrochloric acid solution of liquid-solid ratio 15:1 and concentration 0.7mol/L for the molecular sieve of step (2) gained
+meter) mixing, constant temperature process 1.5 hours at 70 DEG C;
(4) step (3) gained molecular sieve 200 DEG C of dry 3h;
(5) molecular sieve 2 hours of normal octane solvent soaking step (4) gained is got;
(6) molecular sieve after step (5) process was in 140 DEG C of dryings 12 minutes;
(7) step (6) gained Y molecular sieve according to liquid-solid ratio 5:1 with 0.5% sodium hydroxide solution mix, 95 DEG C process 2 hours;
(8) Y molecular sieve after step (7) alkali treatment, 120 DEG C of dryings 2 hours, 550 DEG C of roastings, after 2 hours, obtain modified Y molecular sieve, are numbered Y-4.
Y-4 molecular sieve transmission electron microscope EDAX results measures its outer surface to 100nm thickness SiO
2/ Al
2o
3mol ratio is 15, molecular sieve SiO
2/ Al
2o
3mol ratio is 26.XRD analysis result shows that its lattice constant is 2.438nm, relative crystallinity 94%.Pore volume 0.45ml/g, specific area 700m
2/ g, it is 0.69mmol/g that infrared analysis result measures Y-4 meleic acid amount.
Hydrocracking catalyst preparation process:
(1) W-Ni dipping solution is configured: get after ammonium metatungstate 430g and nickel nitrate 440g is dissolved in water and configure 1000ml dipping solution, in gained dipping solution, active metal is with WO
336g/100ml and 11g/100ml is respectively, solution numbers RY-4 with NiO cubage;
(2) get the mixing of Y-455g and 45g macroporous aluminium oxide, add 4g/100ml dust technology and mix in a mixer and roll to extruding shape, on banded extruder, extruded moulding obtains carrier T-4;
(3) get T-460g and add 120mlRY-4 impregnation fluid 2 hours, then 120 DEG C of dryings 4 hours, 500 DEG C of roastings 3 hours, obtain hydrocracking catalyst, are numbered Cat-4.
comparative example 1
Use a kind of hydrocracking catalyst of industrial extensive use, BCat-1 made by meter, in its catalyst formulation except modified Y molecular sieve, all the other composition and method for preparing catalyst all identical with embodiment 1, catalyst B Cat-1 use Y molecular sieve character as follows: molecular sieve SiO
2/ Al
2o
3mol ratio is 23.XRD analysis result shows that its lattice constant is 2.440nm, relative crystallinity 92%, pore volume 0.36ml/g, specific area 720m
2/ g, meleic acid amount is 0.73mmol/g.
comparative example 2
Use a kind of hydrocracking catalyst of industrial extensive use, BCat-2 made by meter, in its catalyst formulation except modified Y molecular sieve, all the other composition and method for preparing catalyst all identical with embodiment 2, catalyst B Cat-2 use Y molecular sieve character as follows: molecular sieve SiO
2/ Al
2o
3mol ratio is 32.XRD analysis result shows that its lattice constant is 2.426nm, relative crystallinity 88%, pore volume 0.39ml/g, specific area 690m
2/ g, meleic acid amount is 0.55mmol/g.
embodiment 5
In order to investigate the reactivity worth of embodiment 1 ~ 4 and comparative example 1 ~ 2 Kaolinite Preparation of Catalyst, on midget plant, evaluation test has been carried out to catalyst, evaluating apparatus adopts single hop series connection once to pass through flow process, one instead loads regular refiner catalyst, two instead load the hydrocracking catalyst prepared according to embodiment 1 ~ 4 and comparative example 1 ~ 2 method respectively, and feedstock oil character, appreciation condition and evaluation result list in table 1 ~ table 5.
Table 1 feedstock oil character.
Table 2 appreciation condition.
Table 3 evaluation result.
Table 4 embodiment 1 and comparative example 1 catalyst differential responses temperature are investigated and are tested.
Table 5 embodiment 2 and comparative example 2 catalyst differential responses temperature are investigated and are tested.
Show by adopting embodiment 1 and the contrast test of comparative example 1 catalyst on evaluating apparatus, the catalyst adopting the inventive method to prepare has better operating flexibility, in temperature raising process, product slates amplitude of variation is larger, can switch and carry out voluminous naphtha and produce naphtha two kinds of pattern operations less, simultaneously, because the present invention adopts specific process modified Y molecular sieve, while the outside acid centre of raising molecular sieve, remain the high silica alumina ratio of molecular sieve inside, acid centre is less, the secondary cracking that temperature raising process causes significantly reduces, therefore, relative to comparative example 1 catalyst, it is less that embodiment 1 the catalyst increase of hydrogen consumption and liquid in temperature raising process receive fall, more be conducive to the quiet run of device.Embodiment 2 then shows with the contrast test of comparative example 2 catalyst, embodiment 2 catalyst has better temperature raising sensitiveness, be greater than 350 DEG C of cut conversion ratios improve 15 percentage points when reaction temperature is increased to the process of 380 DEG C from 372 DEG C, and comparative example 2 only improves 6 percentage points, compare comparative example 2 catalyst, embodiment 2 catalyst shows larger operating space.Therefore, all in all catalyst of the present invention shows good temperature raising sensitiveness, device operating flexibility and higher liquid yield.
Claims (15)
1. prepare a method for the hydrocracking catalyst containing Y molecular sieve, it is characterized in that comprising following content:
One, modified Y molecular sieve, amorphous silicon aluminium and/or aluminium oxide are mixed according to proportioning, add extruded moulding after dust technology pulping, dry, roasting obtains the silica-alumina supports containing modified Y molecular sieve;
Two, adopt the carrier of maceration extract to step one containing active metal to flood, the carrier drying after dipping, roasting, obtain hydrocracking catalyst;
The preparation method of described modified Y molecular sieve, comprises following content: (1) is that former powder carries out Ammonium Salt Ionic exchange in ammonium salt aqueous solution with NaY zeolite; (2) hydrothermal treatment consists is carried out to the Y molecular sieve after the ammonium exchange obtained in step (1); (3) acid treatment is carried out to the Y molecular sieve that step (2) obtains; (4) to the Y molecular sieve drying process of step (3) gained; (5) Y molecular sieve that step (4) obtains floods in organic solvent, then rapid draing; (6) molecular sieve that step (5) obtains is carried out alkali desiliconization process; (7) the Y molecular sieve drying of step (6) after alkali desiliconization process, calcination process obtain modified Y molecular sieve.
2. in accordance with the method for claim 1, it is characterized in that: the drying condition described in step one is: drying 1 ~ 5 hour at 80 ~ 120 DEG C; Roasting condition is: roasting 1 ~ 5 hour at 400 ~ 700 DEG C.
3. in accordance with the method for claim 1, it is characterized in that: the active metal described in step 2 is selected from the group VIII in the periodic table of elements and/or one or more in group vib metallic element; Group VIII active metal is Ni and/or Co, and group vib active metal is W and/or Mo; The liquid-solid ratio of wherein flooding is 1.5:1 ~ 3:1, the mode of saturated dipping is adopted to carry out, in maceration extract, the content of group vib metallic compound counts 20 ~ 60g/100ml by corresponding oxide, and the content of group VIII metallic compound counts 3 ~ 20g/100ml by corresponding oxide.
4. in accordance with the method for claim 1, it is characterized in that: the drying condition described in step 2 is: drying 2 ~ 8 hours at 90 ~ 150 DEG C; Roasting condition is: roasting 1 ~ 5 hour at 400 ~ 700 DEG C.
5. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, step (1) described Ammonium Salt Ionic exchange process is as follows: be that raw material is in ammonium salt aqueous solution with NaY zeolite, at 60 ~ 120 DEG C, exchange 1 ~ 3 hour, exchange times is 1 ~ 4 time, obtains the NaY zeolite after exchanging, Na
2o content is less than 3.0%; The wherein SiO of NaY zeolite raw material
2/ Al
2o
3mol ratio is 3 ~ 6, sodium oxide molybdena mass percentage 6% ~ 7%; Ammonium salt is one or more in ammonium chloride, ammonium nitrate, ammonium sulfate, ammonium acetate or ammonium oxalate, ammonium salt aqueous solution concentration 0.3 ~ 6.0mol/L.
6. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, step (2) described hydrothermal treatment process be self steam or pass into steam condition under, hydrothermal conditions is: temperature is 500 ~ 600 DEG C, pressure is 0.01 ~ 0.5MPa, and the processing time is 1.0 ~ 6.0 hours.
7. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, the Y molecular sieve that the sour dealumination treatment process described in step (3) adopts inorganic acid and/or organic acid mixed solution treatment step (2) to obtain; The inorganic acid wherein used or organic acid are one or more in sulfuric acid, hydrochloric acid, nitric acid, citric acid, oxalic acid or acetic acid, and inorganic acid and/or organic acid concentration are with H
+count 0.4 ~ 2.0mol/L.
8. according to the method described in claim 1 or 7, it is characterized in that: in the preparation method of modified Y molecular sieve, step (3) Gu described in the liquid/mass ratio of sour dealumination treatment process be 3:1 ~ 30:1; Treatment temperature 60 ~ 120 DEG C, the processing time is 0.5 ~ 3 hour.
9. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, the dried journey described in step (4): 90 ~ 300 DEG C of dryings 2 ~ 10 hours.
10. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, the organic solvent described in step (5) is selected from one or more in alkane, benzinum, carbon tetrachloride, benzene, toluene, ethylbenzene, dimethylbenzene or ethylbenzene.
11. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, and the impregnation method of step (5) adopts supersaturation dipping, and dip time is 1 ~ 5 hour.
12. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, and the baking temperature described in step (5) is 50 ~ 300 DEG C, and drying time is 1 ~ 60 minute.
13. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, the aqueous solution that the alkali lye that alkali desiliconization processing procedure described in step (6) uses is NaOH or potassium hydroxide, wherein the concentration of alkali lye is 0.1wt% ~ 2wt%; Base extraction temperature 50 ~ 100 DEG C, the processing time is 0.5 ~ 4 hour, and the liquid-solid mass ratio of alkali lye/molecular sieve is 5:1 ~ 10:1.
14. in accordance with the method for claim 1, it is characterized in that: in the preparation method of modified Y molecular sieve, and step (7) described drying condition is 90 DEG C ~ 120 DEG C, 2 ~ 4 hours drying times; Roasting condition is 400 ~ 600 DEG C, 2 ~ 4 hours.
15. hydrocracking catalysts prepared according to the method described in the arbitrary claim of claim 1 ~ 14, it is characterized in that: with overall catalyst weight gauge, comprise following component: containing the silica-alumina supports 55% ~ 85% of modified Y molecular sieve, active metal 15% ~ 45%, wherein active metal is with metal oxide; The mass percent of wherein said modified Y molecular sieve in silica-alumina supports is 15% ~ 90%, and surplus is amorphous aluminum silicide and/or aluminium oxide; Modified Y molecular sieve lattice constant is 2.425 ~ 2.455nm; Body phase silica alumina ratio is 10 ~ 60, superficial layer silica alumina ratio 7 ~ 30, and superficial layer silica alumina ratio is lower than body phase silica alumina ratio 8 ~ 40, and wherein said superficial layer refers to that molecular sieve outer surface is to inner 10 ~ 200nm thickness range, and superficial layer is primary in Y molecular sieve before modified; Sodium oxide molybdena mass percentage is less than 1.0%; Modified Y molecular sieve specific area 650 ~ 900m
2/ g; Pore volume 0.30 ~ 0.50ml/g; Meleic acid content 0.3 ~ 1.2mmol/g; Relative crystallinity 80 ~ 120%.
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