CN103769046B - A kind of bimolecular sieve white spirit treating adsorbent and its preparation method and application - Google Patents
A kind of bimolecular sieve white spirit treating adsorbent and its preparation method and application Download PDFInfo
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- CN103769046B CN103769046B CN201410044484.XA CN201410044484A CN103769046B CN 103769046 B CN103769046 B CN 103769046B CN 201410044484 A CN201410044484 A CN 201410044484A CN 103769046 B CN103769046 B CN 103769046B
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Abstract
The invention provides a kind of bimolecular sieve white spirit treating adsorbent and its preparation method and application, described method comprises the steps: that Y zeolite is carried out alkali treatment by (1); (2) Y zeolite after alkali treatment X-type molecular sieve and step (1) obtained mixes, and drying obtains mixture; Y zeolite mass ratio after preferred X-type molecular sieve and alkali treatment is 60-90:100; (3) the mixture metal-nitrate solutions that step (2) obtains is carried out incipient impregnation, dry roasting, obtain described bimolecular sieve white spirit treating adsorbent.This adsorbent is suitable for that 6#, 120#, 200# white spirit carries out deolefination at normal temperatures, Porous deproteinized bone is refined, and treatment process is simple, Be very effective.
Description
Technical field
The present invention relates to petrochemical industry, specifically, relate to a kind of bimolecular sieve white spirit treating adsorbent and its preparation method and application.
Background technology
White spirit is used to oils Cucumber being played to the effects such as dissolving, dilution, washing and extracting.Solvent naphtha is one of five large class oil products, and the purposes of solvent naphtha is very extensive, the first-elected paint solvent oil (being commonly called as paint naphtha) that consumption is maximum, and next has edible oil, printing-ink, leather, agricultural chemicals, pesticide, rubber, cosmetics, spices, medicine, electronic unit equal solvent oil.The whole world consumes about 2,000 ten thousand tons of all kinds of white spirits every year, and its petroleum class white spirit accounts for wherein half.Along with environmental requirement increasingly stringent, the consideration of the health and safety of white spirit user of service is more and more subject to people's attention.
The primary raw material that petroleum series white spirit is produced has three sources, and one is crude oil straight-run, and two is that catalytic reforming is raffinated oil, and three is condensates.Describe them to express by boiling spread.White spirit boiling range scope is narrower, then product quality is better.Alkene in white spirit and arene content are the leading indicators weighing petroleum solvent oil quality, are also the gap places of current domestic base oil solvent naphtha and external high-grade white spirit.
The alkene removed in white spirit mainly contains hydrogenation hydrogenization method and absorption method two kinds of methods at present.Hydrogenation hydrogenization method Arene removal raffinate oil in alkene be by catalytic hydrogenation, this method can reduce alkene and arene content greatly, then through boiling range cutting, corresponding high-quality white spirit can be obtained.But catalytic hydrogenation reaction generally needs medium-pressure or high pressure, at least also want the pressure of several MPa, to the requirement of equipment and the requirement of catalyst all higher, this just brings certain difficulty to the operation of workman, in the middle of the operation being difficult to be widely used in actual factory.
Removing the another kind of method of alkene in white spirit is absorption method, can carry out desorption by carclazyte, but carclazyte inactivation is fast, can not regenerate after carclazyte inactivation, and carclazyte is changed frequent, and also can cause serious environmental pollution to the process of spent bleaching clay.
As everyone knows, when absorption occurs, adsorbate is mainly by duct and geode, and the bug hole entering molecular sieve inside stores, and thus in framework of molecular sieve, the number of bug hole determines its adsorption capacity to a great extent.The method of carrying out pore-creating to molecular sieve with post-processing approach is a lot, and what this was most widely used for several years is exactly alkali treatment technology.Alkali treatment mainly adopts the alkali lye such as NaOH, KOH carry out selective desiliconization to framework of molecular sieve thus form some faults of construction, through follow-up process, the duct of these faults of construction and original molecular sieve is formed again to there is connective secondary pore, result in the increase of molecular sieve specific area and pore volume.
But adopt this post processing boring technique may introduce the mesoporous of some, but skeleton stability will certainly be subject to larger destruction, caving in of skeleton is easily caused in follow-up regenerative process, to such an extent as to the micropore specific area of loss part and pore volume, thus do not maintain stable performance of the adsorbent.How finding a kind of absorption property good and have good stability, the adsorbent of molecular sieve of long service life is still current problem demanding prompt solution.
Summary of the invention
One object of the present invention is to provide a kind of bimolecular to sieve white spirit treating adsorbent; In adsorbent of the present invention, a kind of pore passage structure is provided by X-type molecular sieve, and another kind of pore passage structure is provided by the Y zeolite after alkali treatment.By the method for mechanical mixture by two kinds of molecular sieve mixing back loading active metals, obtain described adsorbent.
Another object of the present invention is to provide described bimolecular to sieve the preparation method of white spirit treating adsorbent;
Another object of the present invention is to provide the application of described bimolecular sieve white spirit treating adsorbent at normal temperatures in petroleum solvent oil-off olefin and aromatic hydrocarbons;
For reaching above-mentioned purpose, on the one hand, the invention provides the preparation method of a kind of bimolecular sieve white spirit treating adsorbent, described method comprises the steps:
(1) Y zeolite is carried out alkali treatment;
(2) Y zeolite after alkali treatment X-type molecular sieve and step (1) obtained mixes, and drying obtains mixture;
(3) the mixture metal-nitrate solutions that step (2) obtains is carried out incipient impregnation, dry roasting, obtain described bimolecular sieve white spirit treating adsorbent.
According to method of the present invention, the Y zeolite mass ratio after the preferred X-type molecular sieve of the present invention and alkali treatment is 60-90:100;
According to method of the present invention, step (2) described drying is dry 4-6h at 80-150 DEG C.
According to method of the present invention, the metal nitrate described in step (3) is selected from the nitrate of the nitrate of the metallic element of IA, IIA, VIII, IB and IIB race and the lanthanide transition metal of IIIB race;
Wherein be preferably selected from AgNO further
3or NiNO
3or La (NO
3)
3.
According to method of the present invention, the mixture quality that in step (3), metal nitrate and step (2) obtain is than being 2-10:100.
According to method of the present invention, the drying of step (3) is dry 12-24h at 90-120 DEG C;
Wherein be preferably dry 12h at 110-120 DEG C.
According to method of the present invention, the roasting of step (3) is for being warming up to 450-640 DEG C of roasting 4-6h;
Wherein the preferred described intensification of the present invention is with 4-8 DEG C/min speed from room temperature to 400 DEG C, then is warming up to 450-640 DEG C with 2-4 DEG C/min speed.
According to method of the present invention, described X-type molecular sieve is 10X or 13X molecular sieve; Y zeolite is the Y zeolite after alkali treatment with step pore distribution.
There is after this alkali treatment the Y zeolite dawn known to those skilled in the art of step pore distribution, such as NaY or HY type molecular sieve; Again for example purchased from NaY or the HY type molecular sieve of Tianjin Nan Hua catalyst Co., Ltd.
According to method of the present invention, the alkali treatment described in step (1) can be the alkali treatment method of prior art routine, such as alkali treatment method disclosed in patent 200810223771.1; Concrete is for example according to Y zeolite: alkali: water=(0.1-2): (0.05-2): the mass ratio of (4-15), Y zeolite is pulled an oar with the aqueous solution of alkali and mixes, and stir enforcement alkali treatment 0.1-24h under maintaining the temperature conditions of 0-120 DEG C, and this alkali treatment process is at least one times;
Wherein can be not less than 5.0 by preferred described y-type zeolite silica alumina ratio;
Described Y zeolite can be NaY molecular sieve, from the NaY molecular sieve be separated with crystallization mother liquor after crystallization synthesis, or includes the molecular sieve mixture of crystallization mother liquor;
Wherein can also further preferably the mass ratio of Y zeolite, alkali and water be (0.5-2): (0.075-1): (4-10);
Wherein said alkali can be one or both the mixing in NaOH, KOH.
On the other hand, present invention also offers bimolecular sieve white spirit treating adsorbent prepared by described method, described bimolecular sieve white spirit treating adsorbent is prepared by the method comprised the steps:
(1) Y zeolite is carried out alkali treatment;
(2) Y zeolite after alkali treatment X-type molecular sieve and step (1) obtained mixes, and drying obtains mixture;
(3) the mixture metal-nitrate solutions that step (2) obtains is carried out incipient impregnation, dry roasting, obtain described bimolecular sieve white spirit treating adsorbent.
According to adsorbent of the present invention, the Y zeolite mass ratio after the preferred X-type molecular sieve of the present invention and alkali treatment is 60-90:100;
According to adsorbent of the present invention, step (2) described drying is dry 4-6h at 80-150 DEG C.
According to adsorbent of the present invention, the metal nitrate described in step (3) is selected from the nitrate of the nitrate of the metallic element of IA, IIA, VIII, IB and IIB race and the lanthanide transition metal of IIIB race;
Wherein be preferably selected from AgNO further
3or NiNO
3or La (NO
3)
3.
According to adsorbent of the present invention, the mixture quality that in step (3), metal nitrate and step (2) obtain is than being 2-10:100.
According to adsorbent of the present invention, the drying of step (3) is dry 12-24h at 90-120 DEG C;
Wherein be preferably dry 12h at 110-120 DEG C.
According to adsorbent of the present invention, the roasting of step (3) is for being warming up to 450-640 DEG C of roasting 4-6h;
Wherein the preferred described intensification of the present invention is with 64-8 DEG C/min speed from room temperature to 400 DEG C, then is warming up to 450-640 DEG C with 2-4 DEG C/min speed.
According to adsorbent of the present invention, described X-type molecular sieve is 10X or 13X molecular sieve; Y zeolite is the Y zeolite after alkali treatment with step pore distribution.
There is after this alkali treatment the Y zeolite dawn known to those skilled in the art of step pore distribution, such as NaY or HY type molecular sieve; Again for example purchased from NaY or the HY type molecular sieve of Tianjin Nan Hua catalyst Co., Ltd.
According to adsorbent of the present invention, the alkali treatment described in step (1) can be the alkali treatment method of prior art routine, such as alkali treatment method disclosed in patent 200810223771.1; Concrete is for example according to Y zeolite: alkali: water=(0.1-2): (0.05-2): the mass ratio of (4-15), Y zeolite is pulled an oar with the aqueous solution of alkali and mixes, and stir enforcement alkali treatment 0.1-24h under maintaining the temperature conditions of 0-120 DEG C, and this alkali treatment process is at least one times;
Wherein can be not less than 5.0 by preferred described y-type zeolite silica alumina ratio;
Described Y zeolite can be NaY molecular sieve, from the NaY molecular sieve be separated with crystallization mother liquor after crystallization synthesis, or includes the molecular sieve mixture of crystallization mother liquor;
Wherein can also further preferably the mass ratio of Y zeolite, alkali and water be (0.5-2): (0.075-1): (4-10);
Wherein said alkali can be one or both the mixing in NaOH, KOH.
Again on the one hand, present invention also offers the application of described bimolecular sieve white spirit treating adsorbent at normal temperatures in petroleum solvent oil-off olefin and aromatic hydrocarbons;
Wherein preferred described white spirit is 6#, 120# or 200# white spirit.
In sum, the invention provides a kind of bimolecular sieve white spirit treating adsorbent and its preparation method and application.Adsorbent tool of the present invention has the following advantages:
This adsorbent is suitable for that 6#, 120#, 200# white spirit carries out deolefination at normal temperatures, Porous deproteinized bone is refined, and treatment process is simple, Be very effective.Compare (CN1891792A) with the adsorbent of report, in the close situation of other operating conditions, when adsorbent use amount is less than 5% of literature values, de-fragrant rate, the de-alkene rate of products obtained therefrom are suitable, and the adsorbent life-span that this patent is announced is longer.
Detailed description of the invention
Describe the beneficial effect of implementation process of the present invention and generation below by way of specific embodiment in detail, be intended to help reader to understand essence of the present invention and feature better, not as can the restriction of practical range to this case.
Alkali treatment embodiment
Embodiment 1
Configure NaOH solution warming-in-water to 80 DEG C that 500ml concentration is 0.25mol/L, claim 25g is purchased Y zeolite and drops in NaOH solution and stir 200 minutes, then at once mixture ice bath is down to normal temperature, filter and use deionized water filtration washing filter cake repeatedly, until the pH value of filter liquor is about 7.Gained filter cake is placed on 110 DEG C of oven drying 4hrs.Gained is the Y zeolite of alkali treatment, and specific area is 682m
2/ g.
Embodiment 2
Configure NaOH solution warming-in-water to 90 DEG C that 500ml concentration is 0.50mol/L, claim 25g is purchased Y zeolite and drops in NaOH solution and stir 200 minutes, then at once mixture ice bath is down to normal temperature, filter and use deionized water filtration washing filter cake repeatedly, until the pH value of filter liquor is about 7.Gained filter cake is placed on 110 DEG C of oven drying 4hrs.Gained is the Y zeolite of alkali treatment, and specific area is 706m
2/ g.
Embodiment 3
Configure NaOH solution warming-in-water to 90 DEG C that 500ml concentration is 1.0mol/L, claim 25g is purchased Y zeolite and drops in NaOH solution and stir 200 minutes, then at once mixture ice bath is down to normal temperature, filter and use deionized water filtration washing filter cake repeatedly, until the pH value of filter liquor is about 7.Gained filter cake is placed on 110 DEG C of oven drying 4hrs.Gained is the Y zeolite of alkali treatment, and specific area is 715m
2/ g.
Molecular sieve embodiment (following all employings alkali treatment embodiment 1 product):
Embodiment 1
Use Ni (NO
3)
2y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 60:100, Ni (NO
3)
2the mass ratio of solid and molecular sieve is 5:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 20 hours, then with room temperature ~ 400 DEG C with 5 DEG C/min, 400 ~ 550 DEG C be raised to 550 DEG C with the speed of 2 DEG C/min after roasting 4 hours.
Embodiment 2
Use Ni (NO
3)
2y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 60:100, Ni (NO
3)
2the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 20 hours, then with room temperature ~ 400 DEG C with 5 DEG C/min, 400 ~ 550 DEG C be raised to 550 DEG C with the speed of 2 DEG C/min after roasting 4 hours.
Embodiment 3
Use Ni (NO
3)
2y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 80:100, Ni (NO
3)
2the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 12 hours, then with room temperature ~ 400 DEG C with 8 DEG C/min, 400 ~ 600 DEG C be raised to 600 DEG C with the speed of 4 DEG C/min after roasting 4 hours.
Embodiment 4
Use AgNO
3y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 80:100, AgNO
3the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 12 hours, then with room temperature ~ 400 DEG C with 8 DEG C/min, 400 ~ 600 DEG C be raised to 600 DEG C with the speed of 4 DEG C/min after roasting 4 hours.
Embodiment 5
Use AgNO
3y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 60:100, AgNO
3the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 100 DEG C of dryings 20 hours, then with room temperature ~ 400 DEG C with 8 DEG C/min, 400 ~ 600 DEG C be raised to 600 DEG C with the speed of 4 DEG C/min after roasting 4 hours.
Embodiment 6
Use AgNO
3y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 60:100, AgNO
3the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 20 hours, then with room temperature ~ 400 DEG C with 5 DEG C/min, 400 ~ 550 DEG C be raised to 550 DEG C with the speed of 2 DEG C/min after roasting 4 hours.
Embodiment 7
Use AgNO
3solution impregnation 10X type molecular sieve, AgNO
3the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 12 hours, then with room temperature ~ 400 DEG C with 8 DEG C/min, 400 ~ 600 DEG C be raised to 600 DEG C with the speed of 4 DEG C/min after roasting 4 hours.
Embodiment 8
Use AgNO
3y zeolite after solution impregnation 10X+ alkali treatment, the mass ratio of the Y zeolite wherein after 10X type molecular sieve and alkali treatment is 1:1, AgNO
3the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 12 hours, then with room temperature ~ 400 DEG C with 8 DEG C/min, 400 ~ 600 DEG C be raised to 600 DEG C with the speed of 4 DEG C/min after roasting 4 hours.
Embodiment 9
Use AgNO
3solution impregnation Y zeolite, AgNO
3the mass ratio of solid and molecular sieve is than being 10:100, after the mixture obtained after dipping spends deionized water, 120 DEG C of dryings 12 hours, then with room temperature ~ 400 DEG C with 8 DEG C/min, 400 ~ 600 DEG C be raised to 600 DEG C with the speed of 4 DEG C/min after roasting 4 hours.
Embodiment 10
The use experiment that the present embodiment is embodiment 4, embodiment 7, embodiment 8, embodiment 9 obtain adsorbent.
Micro-duplex plunger pump is adopted to be passed into from continuous micro-anti-column device bottom by pending white spirit, previously prepared good adsorbent layer in post, when first white spirit flows out from micro-anti-column device top, as zero timing point, later often through getting a sample after an hour.Molecular sieve admission space 5ml, air speed 0.5-1.5h-1, the aromatic hydrocarbons of experiment outflow sample and olefin(e) centent adopt the chromatogram of Beijing Analytical Instrument Factory 3420 model, and the capillary gasoline PONA post of Shi Ke institute OV101 detects.Experimental result: 120# white spirit arene content 3.195% before not removing, olefin(e) centent 0.979%, utilize adsorbent successfully can remove aromatic hydrocarbons in this white spirit and alkene, utilize the adsorbent in embodiment 4 olefin(e) centent can be dropped to 0.09%, arene content is reduced to 0.21%, all reaches more than 90% to the removal efficiency of the aromatic hydrocarbons in white spirit and alkene simultaneously.Adsorbent in embodiment 7 is only containing X-type molecular sieve, can olefin(e) centent is down to 0.11%, arene content is down to 0.24%, and experimental data and embodiment 4 contrast and can find out, although this adsorbent initial adsorption effect is better, but its service life is short, and inactivation is fast.Adsorbent in embodiment 8 contains X-type and Y zeolite, and its ratio is 1:1, olefin(e) centent can be down to 0.11%, arene content is down to 0.23%, and as can be seen from experimental data, this adsorbent initial adsorption effect is better, service life, comparatively embodiment 7 increased, but far away not as good as embodiment 4.Adsorbent in embodiment 9 is only containing Y zeolite, and alkene can be down to 0.13%, arene content is down to 0.26%, can find out that this adsorbent inactivation is slow, long service life, but adsorption effect is poor by experimental data.In sum, the ratio of X-type molecular sieve and the Y zeolite adsorbent effect of synthesizing when 60-90:100 is best.Detailed results is in table 1.
Table 1120# white spirit is at the alkene arene content of different delivery time
Claims (9)
1. a preparation method for bimolecular sieve white spirit treating adsorbent, it is characterized in that, described method comprises the steps:
(1) Y zeolite is carried out alkali treatment;
(2) Y zeolite after alkali treatment X-type molecular sieve and step (1) obtained mixes, and drying obtains mixture; Y zeolite mass ratio after described X-type molecular sieve and alkali treatment is 60-90:100;
(3) by mixture AgNO that step (2) obtains
3solution carries out incipient impregnation, after drying with 4-8 DEG C/min speed by room temperature to 400 DEG C, then be warming up to 450-640 DEG C of roasting 4-6 hour with 2-4 DEG C/min speed, obtain described bimolecular sieve white spirit treating adsorbent;
AgNO in step (3)
3the mixture quality obtained with step (2) is than being 2-10:100.
2. method according to claim 1, is characterized in that, step (2) described drying is dry 4-6h at 80-150 DEG C.
3. method according to claim 1 and 2, is characterized in that, the drying of step (3) is dry 12-24h at 90-120 DEG C.
4. method according to claim 3, is characterized in that, the drying of step (3) is dry 12h at 110-120 DEG C.
5. method according to claim 1 and 2, is characterized in that, described X-type molecular sieve is 10X or 13X molecular sieve; Y zeolite is NaY or HY type molecular sieve.
6. method according to claim 1 and 2, it is characterized in that, alkali treatment described in step (1) is according to Y zeolite: alkali: water=(0.1-2): (0.05-2): the mass ratio of (4-15), Y zeolite is pulled an oar with the aqueous solution of alkali and mixes, and stir enforcement alkali treatment 0.1-24h under maintaining the temperature conditions of 0-120 DEG C, and this alkali treatment process is at least one times.
7. the bimolecular sieve white spirit treating adsorbent that described in claim 1 ~ 6 any one prepared by method, described bimolecular sieve white spirit treating adsorbent is prepared by the method comprised the steps:
(1) Y zeolite is carried out alkali treatment;
(2) Y zeolite after alkali treatment X-type molecular sieve and step (1) obtained mixes, and drying obtains mixture;
(3) by mixture AgNO that step (2) obtains
3solution carries out incipient impregnation, dry roasting, obtains described bimolecular sieve white spirit treating adsorbent.
8. the application of bimolecular according to claim 7 sieve white spirit treating adsorbent at normal temperatures in petroleum solvent oil-off olefin and aromatic hydrocarbons.
9. the application of bimolecular according to claim 8 sieve white spirit treating adsorbent at normal temperatures in petroleum solvent oil-off olefin and aromatic hydrocarbons, it is characterized in that, described white spirit is 6#, 120# or 200# white spirit.
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| CN105289481A (en) * | 2015-09-08 | 2016-02-03 | 山东成泰化工有限公司 | Solvent oil refined adsorbent and preparation method thereof |
| CN105536695B (en) * | 2015-12-11 | 2019-08-27 | 中国海洋石油集团有限公司 | A kind of adsorbent and preparation method of adsorbing separation polycyclic aromatic hydrocarbon |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1891792A (en) * | 2005-10-21 | 2007-01-10 | 中国石油大学(北京) | Petroleum solvent oil refining adsorbent, and its preparing method and use |
| CN101722022A (en) * | 2008-10-10 | 2010-06-09 | 中国石油天然气集团公司 | Alkali treatment modifying method of Y-shaped molecular sieve |
| CN103449959A (en) * | 2012-06-01 | 2013-12-18 | 中化蓝天集团有限公司 | Preparation method of ultra-pure 1,1,1,2,3,3,3-heptafluoropropane |
| CN103495435A (en) * | 2013-10-18 | 2014-01-08 | 凯瑞化工股份有限公司 | Catalyst for removing olefins in reformate and preparation method of catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7326332B2 (en) * | 2003-09-25 | 2008-02-05 | Exxonmobil Chemical Patents Inc. | Multi component catalyst and its use in catalytic cracking |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1891792A (en) * | 2005-10-21 | 2007-01-10 | 中国石油大学(北京) | Petroleum solvent oil refining adsorbent, and its preparing method and use |
| CN101722022A (en) * | 2008-10-10 | 2010-06-09 | 中国石油天然气集团公司 | Alkali treatment modifying method of Y-shaped molecular sieve |
| CN103449959A (en) * | 2012-06-01 | 2013-12-18 | 中化蓝天集团有限公司 | Preparation method of ultra-pure 1,1,1,2,3,3,3-heptafluoropropane |
| CN103495435A (en) * | 2013-10-18 | 2014-01-08 | 凯瑞化工股份有限公司 | Catalyst for removing olefins in reformate and preparation method of catalyst |
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