CN105327677B - The adsorbent and preparation method of double ring arene in a kind of separation diesel oil - Google Patents
The adsorbent and preparation method of double ring arene in a kind of separation diesel oil Download PDFInfo
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Abstract
The present invention relates to a kind of adsorbents for detaching double ring arene in diesel oil, which is characterized in that the adsorbent includes low silica-alumina ratio LSX molecular sieves and load two metal ion species on the carrier, and the grain size of the X molecular sieve and LSX are 50~200nm.It when prepared by the adsorbent, is uniformly mixed with waterglass, sodium metaaluminate, sodium hydroxide, potassium hydroxide, deionized water, forms silicon-aluminum sol, aging crystallization again, molecular sieve carrier is made, is then contacted with the mixed solution containing two metal ion species and carries out ion exchange, the adsorbent is made.The adsorbent has stronger adsorption capacity to double ring arene, double ring arene that can effectively in adsorbing separation diesel oil, and selectivity is higher.
Description
Technical field
The present invention relates to a kind of adsorbents and preparation method for detaching double ring arene in diesel oil.
Technical background
Double ring arene is containing there are two the compound of aromatic ring, such as naphthalene, methyl naphthalene, dimethylnaphthalene etc., and double ring arene is deposited extensively
It is in diesel oil, for diesel engine, the double ring arene Cetane number in diesel oil is low, and combustibility is poor, is diesel vehicle
Tail gas PM2.5 particulate matters formation the main reason for one of, and the particulate matter containing double ring arene have toxicity, cause mutagenicity and
Carcinogenicity.In actual production, catalytic cracking, coking, etc. unit processes production diesel oil in double ring arene be far longer than 11%.
According to statistics, China's derv fuel is mainly made of Atmospheric vacuum diesel oil, coker gas oil, catalytic cracking diesel oil, and respective proportion is
59.79%th, 18.07%, 17.42%, Atmospheric vacuum diesel oil two ring aromatic content is relatively low, and Cetane number is higher, is ideal diesel oil
Component, and catalytic cracking diesel oil and coker gas oil two ring aromatic content are higher, cause diesel oil two ring aromatic content high.Derv fuel
The bicyclic polycyclic aromatic hydrocarbon content of clear stipulaties is not more than 11% in standard GB/T 19147-2013, exploitation cleaning diesel production technology
It is current desired to promote diesel oil upgrading, from the point of view of long term growth, realizes that national energy-saving emission reduction development strategy is complied in diesel oil upgrading
It is inexorable trend.
A kind of effective ways for reducing two ring aromatic content in diesel oil are adsorbing and removing double ring arenes.
Patent CN101891292B disclose it is a kind of for double ring arene in adsorbing and removing water, polycyclic aromatic hydrocarbon adsorbent and
Preparation method.The adsorbent is a kind of electro spinning nanometer fiber membrane, specifically with polyphosphazene polymer lactic acid-caprol acton and block copolymerization
Object surfactant is main component, tunica fibrosa 400~800nm of fibre diameter of formation, can be effectively in quick adsorption water pair
Cycloaromatics and polycyclic aromatic hydrocarbon, adsorbent making is simple recyclable, easy to operate, but is only used for micro double ring arene in water
Absorption, it is desirable that concentration range is 1~10mg/L, is not suitable for the adsorbing separation of higher concentration double ring arene.
CN102908991B discloses a kind of adsorbent and preparation method of the adsorbing and removing naphthalene from organic gas.The absorption
Agent uses activated carbon as carrier, and it is auxiliary agent to load a small amount of cetyl trimethylammonium bromide or aluminium chloride, is less than 50 DEG C in temperature,
Pressure is less than under the conditions of 3MPa, and naphthalene content is reduced to 45mg/g in gas, and saturated extent of adsorption reaches 23.6%~31.2%.
Existing adsorbent saturated extent of adsorption is smaller, and poor selectivity is usually used in trace contaminant purified treatment, is not suitable for absorption
Detach the double ring arene in diesel oil.
Invention content
The technical problems to be solved by the invention are to provide a kind of absorption containing LSX types molecular sieve and two metal ion species
Agent, can effectively adsorb the double ring arene in diesel oil, which has preferable selectivity；The invention solves other skill
Art problem is to provide the preparation of the adsorbent and double ring arene adsorbing separation application process.
The adsorbent of double ring arene in a kind of separation diesel oil, the adsorbent include LSX molecular sieve carriers and are supported on
Two metal ion species on LSX molecular sieves, the content of the metal ion are 0.1wt%~40wt%, the adsorbent by
Following steps are made：
1) LSX molecules are synthesized using convenient source waterglass, sodium metaaluminate, sodium hydroxide, potassium hydroxide, deionized water
Sieve, the silicon-aluminum sol mole composition being ultimately formed are as follows：(3.8~5.5) Na2O:(0.8~3.2) K2O:Al2O3:(1.95~
2.25)SiO2:(120~220) H2O；
2) it by the prepared silicon-aluminum sol of step 1) aging crystallization in a heated condition, is then filtered, washed, dries, roasts
It burns to get to the LSX molecular sieve carriers；
3) by LSX molecular sieves that step 2) obtains and contain Mg2+、Ca2+、Ba2+Cu2+、Ni2+、Mn2+、Zn2+、Fe3+、Co3+、
Cr3+In arbitrary two metal ion species mixed solution contact carry out ion exchange, be then filtered, washed, roast, obtain containing two
The molecular sieve of metal ion species, as described adsorbent.
The present invention still further provides the preparation method of the adsorbent of double ring arene in above-mentioned separation diesel oil, including following
Step：
1) it is uniformly mixed, is formed using convenient source waterglass, sodium metaaluminate, sodium hydroxide, potassium hydroxide, deionized water
Silicon-aluminum sol, the silicon-aluminum sol mole composition being ultimately formed is as being (3.8~5.5) Na2O:(0.8~3.2) K2O:Al2O3:
(1.95~2.25) SiO2:(120~220) H2O。
2) it by crystallization under the prepared silicon-aluminum sol aging of step 1), is then filtered, washed, dries, roasting to get to institute
The LSX molecular sieve carriers stated.
3) by LSX molecular sieves that step 2) obtains and contain Mg2+、Ca2+、Ba2+Cu2+、Ni2+、Mn2+、Zn2+、Fe3+、Co3+、
Cr3+In the mixed solution contacts of arbitrary two metal ion species carry out ion exchange, be then filtered, washed, roast after it is obtained.
In the preparation method of adsorbent of the present invention, step 2) preferably aging temperature is 55-95 DEG C, and ageing time 1~6 is small
When, crystallization temperature is 85~115 DEG C, and crystallization time is 1~20 hour.
In the preparation method of adsorbent of the present invention, corresponding metal salt preferably is made in required metal ion in step 3)
Mixed solution, the metal ion solution metal total concentration is 0.01~2.0mol/L, then molecular sieve is placed in metal salt solution
Among, 1~20h is stirred under the conditions of 35~95 DEG C, controls the solid-liquid of rotating speed 120r/min~200r/min, molecular sieve and solution
Ratio is 1g：5ml~1g：25ml, molecular sieve filtration, washing after exchange, drying, roasting obtain the adsorbent.
The application conditions of adsorbent of the present invention double ring arene in adsorbing separation diesel oil：50~150 DEG C of adsorption temp,
Adsorptive pressure is 0.5~2MPa, and the strippant used in adsorption process is toluene, benzene, ethyl alcohol, one kind in hexamethylene or several
Kind.
The adsorbent of double ring arene has stronger adsorption capacity to double ring arene in present invention separation diesel oil, can be effectively
Double ring arene in adsorbing separation diesel oil, selectivity are higher.
Specific embodiment
In adsorbent of the present invention, LSX type zeolite crystals are preferably sized to 50~200nm, and the metal ion is
Mg2+、Ca2+、Ba2+Cu2+、Ni2+、Mn2+、Zn2+、Fe3+、Co3+、Cr3+In arbitrary two metal ion species.
X or LSX molecular sieves of the present invention can be according to the method for the invention and prepare or according to existing
Have prepared by technology, such as LSX molecular sieves prepared by patent CN101745365B, CN102874837B, CN101289197B, but
The LSX molecular sieves that preferably prepared by the present invention.
In sorbent preparation method provided by the invention, it is described for conventionally synthesize LSX molecular sieves, refer to according to
Sol method used by synthesis routine LSX molecular sieves, generally includes silicon source, silicon source, water, alkali compounds etc. and is mixed to form colloidal sol
The step of, the present invention does not have particular/special requirement.
Molecular sieve provided by the present invention and metallic ion mixed liquor contact method exchange mole of metal ion in solution
A concentration of 0.01~2.0mol/L, exchange temperature are 35~95 DEG C, and swap time is 1~20 hour, exchange times to be primary or
Person is multiple, and the present invention is not particularly limited exchange times, reaches required metal ion content.Metal of the present invention from
Son is soluble metal salt aqueous solution, such as Mg2+、Ca2+、Ba2+Cu2+、Ni2+、Mn2+、Zn2+、Fe3+、Co3+、Cr3+Nitrate
Or chlorate.
Adsorbing and removing double ring arene method provided by the present invention, simulation diesel oil are contacted with adsorbent at 50~120 DEG C
Adsorbing separation, double ring arene are stayed in adsorbent, using one kind in toluene, benzene, ethyl alcohol, hexamethylene, hexahydrotoluene or several
Kind flushes out double ring arene, so adsorbing separation can go out double ring arene from diesel oil repeatedly as strippant.
Illustrate the invention process, but be not limited only to these examples below by example.
Diesel oil used in embodiment for simulation diesel oil, containing decahydronaphthalene, hexadecane, detergent alkylate, naphthalene, methyl naphthalene,
Naphthane multiple compounds.The content of double ring arene is measured using gas chromatography GC and chromatograph-mass spectrometer GC-MS.
In invention adsorbing separation diesel oil double ring arene evaluation method is as follows：
100g adsorbents are packed into ADSORPTION IN A FIXED BED column, are pre-processed, activation condition is：200~450 DEG C of temperature rises
Warm rate is 5~10 DEG C/min, is kept for 1~4 hour at 250 DEG C, is kept for 1~4 hour at 450 DEG C, nitrogen (or hydrogen) stream
Speed is 30~220mL/min.Bed temperature is reduced after activation to 50~120 DEG C, carries out double ring arene adsorbing separation experiment,
Absorption separation condition is：50~150 DEG C of temperature, pressure are 0.1~2MPa, simulate diesel oil 0.5~5ml/min of flow velocity, continuous fixed
Phase sampling analysis is formed, the bicyclic virtue of component collected first with gas chromatograph and chromatograph-mas spectrometer analysis product liquid
Hydrocarbon content is relatively low, is denoted as cleaning diesel component, analyzes and product two ring aromatic content and double ring arene removal efficiency is calculated, when
When the absorption bicyclic cycloaromatics of column outlet penetrates, stop diesel feed, be passed through strippant, double ring arene in column is extracted out, be denoted as double
Cyclophane the hydrocarbon component analyzes two ring aromatic content in component.
Clean diesel yield=cleaning diesel component quality/simulation diesel oil gross mass × 100%
Clean double ring arene quality/cleaning diesel component component in diesel component two ring aromatic content=cleaning diesel component
Gross mass × 100%
Double ring arene removal efficiency=(double ring arene quality in double ring arene quality-cleaning diesel component in raw material diesel oil)/
Double ring arene quality × 100% in diesel oil
Embodiment 1
(1) silicon-aluminum sol is formed：66.6g sodium hydroxides are dissolved in 532.5ml deionized waters, it is molten to form sodium hydroxide
Liquid adds in 103.6g potassium hydroxide in sodium hydroxide solution, and stirring postcooling is for use, and continuation is slowly added under agitation
74.1g sodium aluminates continue to stir, and are slowly added to 150g waterglass after being completely dissolved cooling, form molecular sieve colloidal sol, formed
Colloidal sol mole forms：3.95Na2O:2.64K2O:Al2O3:2.26SiO2:123H2O。
(2) aging crystallization：Collosol intermixture is packed into stainless steel stirred tank, carries out aging and crystallization in a heated condition, always
It is 70 DEG C to change temperature, ageing time 4 hours, and crystallization temperature is 100 DEG C, and crystallization time is 12 hours, rapid cold after crystallization
But, it is washed with deionized to neutrality, then drying 24 hours at 100 DEG C, roast 4 hours obtained LSX molecules at 550 DEG C
Sieve.
(3) ion exchange：The LSX molecular sieves after 100g roastings are taken, prepare 0.05mol/L copper nitrates and 0.05mol/L nitre
Molecular sieve is placed in the prepared mixed solutions of 1500ml and stirs, contacted with the aqueous solution for having metal ion by sour magnesium solution 5L
Ion exchange is carried out, controls 180 turns/min of stir speed (S.S.), exchange temperature is 50 DEG C, and swap time is 4 hours, after exchange
It is washed with a large amount of deionized waters, it is then 24 hours dry at 100 DEG C, it is roasted at 550 DEG C 4 hours and the adsorbent is made.
(4) performance of the adsorbent is evaluated：Using fixed-bed adsorber, adsorbent filling 80g is soaked first with hexahydrotoluene
Adsorption column is passed through simulation diesel oil with constant pump speed 1.5ml/min, and simulation diesel oil composition is shown in Table 1, keeps absorption column temperature at 60 DEG C
Left and right, adsorbs 0.1~1.0MPa of column pressure, and detection absorption column outlet two ring aromatic content collects cleaning diesel component, works as outlet
When detecting apparent two ring aromatic content, stopping is passed through simulation diesel oil, and charging is changed to strippant, and constant pump speed 5ml/min is collected
The two ring aromatic content in sample is collected in double ring arene component, analysis, and strippant used in this example is benzene.Double ring arene is calculated to take off
Except rate, adsorbent evaluation is shown in Table 2.
Embodiment 2
(1) it is same as Example 1 to form silicon-aluminum sol.
(2) aging crystallization condition is same as Example 1.
(3) ion exchange uses 0.05mol/L barium nitrates and 0.05mol/L copper nitrate solutions, other conditions and embodiment 1
It is identical.
(4) performance of the adsorbent evaluation is same as Example 1, the use of strippant is hexahydrotoluene, and adsorbent evaluation is shown in Table
2。
Embodiment 3
(1) it is same as Example 1 to form silicon-aluminum sol.
(2) aging crystallization condition is same as Example 1.
(3) ion exchange uses 0.05mol/L magnesium nitrates and 0.05mol/L nickel nitrate solutions, other conditions and embodiment 1
It is identical.
(4) performance of the adsorbent evaluation is same as Example 1, the use of strippant is toluene, and adsorbent evaluation is shown in Table 2.
Embodiment 4
(1) it is same as Example 1 to form silicon-aluminum sol.
(2) aging crystallization condition is same as Example 1.
(3) ion exchange uses 0.05mol/L barium nitrates and 0.05mol/L iron nitrate solutions, other conditions and embodiment 1
It is identical.
(4) performance of the adsorbent evaluation is same as Example 1, the use of strippant is hexahydrotoluene, and adsorbent evaluation is shown in Table
2。
Embodiment 5
(it is same as Example 1 that (1) forms silicon-aluminum sol.
(2) aging crystallization condition is same as Example 1.
(3) ion exchange uses 0.05mol/L ferric nitrates and 0.05mol/L copper nitrate solutions, other conditions and embodiment 1
It is identical.
(4) performance of the adsorbent evaluation is same as Example 1, the use of strippant is hexahydrotoluene, and adsorbent evaluation is shown in Table
2。
Embodiment 6
(1) it is same as Example 1 to form silicon-aluminum sol.
(2) aging crystallization condition is same as Example 1.
(3) ion exchange uses deionized water solution, and other conditions are same as Example 1.
(4) performance of the adsorbent evaluation is same as Example 1, the use of strippant is hexahydrotoluene, and adsorbent evaluation is shown in Table
2。
Simulation diesel oil composition is shown in Table 1, and non-aromatic compound refers to decahydronaphthalene, hexadecane, mononuclear aromatics refer to detergent alkylate,
Naphthane, double ring arene refer to naphthalene, methyl naphthalene.
Table 1 simulates diesel raw material composition
| Mononuclear aromatics contains w% | Two ring aromatic content w% | Non-aromatic content w% |
| 34.49 | 45.85 | 19.66 |
From Table 2, it can be seen that adsorbent can reduce the two ring aromatic content in simulation diesel oil.
The evaluation result of the different adsorbents of table 2
Claims (6)
1. it is a kind of detach diesel oil in double ring arene adsorbent, which is characterized in that the adsorbent include LSX molecular sieve carriers with
And two metal ion species on LSX molecular sieves are supported on, the content of the metal ion is 0.1wt%~40wt%, described
Adsorbent is made of following steps：
1) LSX molecular sieves are synthesized using convenient source waterglass, sodium metaaluminate, sodium hydroxide, potassium hydroxide, deionized water, most
The silicon-aluminum sol mole composition formed eventually is as follows：(3.8~5.5) Na2O:(0.8~3.2) K2O:Al2O3:(1.95~2.25)
SiO2:(120~220) H2O；
2) it by the prepared silicon-aluminum sol of step 1) aging and crystallization in a heated condition, is then filtered, washed, dries, roasts,
Obtain the LSX molecular sieve carriers；
3) the LSX molecular sieves that step 2) obtains with the mixed solution containing two metal ion species are contacted and carries out ion exchange, so
After be filtered, washed, roast after be made；Two metal ion species are Cu2+And Mg2+, Ba2+And Cu2+, Mg2+And Ni2+, Ba2+With
Fe3+, alternatively, Fe3+And Cu2+；
The adsorbent has the double ring arene in diesel oil selection suction-operated, makes repeatedly after strippant desorption and regeneration
With.
2. the adsorbent of double ring arene in separation diesel oil according to claim 1, which is characterized in that the LSX types molecule
The grain size of sieve is 50-200nm.
3. a kind of preparation method of the adsorbent of double ring arene in separation diesel oil described in claim 1, which is characterized in that including
Following steps：
1) it is uniformly mixed using convenient source waterglass, sodium metaaluminate, sodium hydroxide, potassium hydroxide, deionized water, forms sial
Colloidal sol, the silicon-aluminum sol mole composition being ultimately formed are as follows：(3.8~5.5) Na2O:(0.8~3.2) K2O:Al2O3:(1.95
~2.25) SiO2:(120~220) H2O；
2) it by the prepared silicon-aluminum sol aging of step 1) and crystallization, is then filtered, washed, dries, roasting to get to described
LSX molecular sieve carriers；
3) the LSX molecular sieve carriers that step 2) obtains with the mixed solution containing two metal ion species are contacted and carries out ion friendship
Change, be then filtered, washed, roast after be made；The two wherein described metal ion species are Cu2+And Mg2+, Ba2+And Cu2+, Mg2+With
Ni2+, Ba2+And Fe3+, alternatively, Fe3+And Cu2+。
4. preparation method according to claim 3, which is characterized in that step 2) aging temperature is 55-95 DEG C, ageing time
1~6 hour, crystallization temperature was 85~115 DEG C, and crystallization time is 1~20 hour.
5. preparation method according to claim 3, which is characterized in that total in metallic ion mixed liquor described in step 3)
Metal concentration is 0.01~2.0mol/L, and the solid-liquid ratio of molecular sieve and solution is 1g：5ml~1g：25ml, Contact Temperature 35
~95 DEG C, time of contact is 1~20h.
6. a kind of application of adsorbent described in claim 1 double ring arene in diesel oil is detached, it is characterised in that：Adsorbing separation
Condition is：25~100 DEG C, 0.1~2.0MPa of adsorptive pressure of adsorption temp, double ring arene strippant is toluene, benzene, ethyl alcohol, ring
One or more of hexane.
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| CN102874837A (en) * | 2011-07-11 | 2013-01-16 | 中国石油化工股份有限公司 | Preparation method of low silica aluminium molecular sieve LSX directly synthesized from kaolin |
| CN103539150A (en) * | 2013-10-15 | 2014-01-29 | 北京工业大学 | Low-silica-alumina-ratio X-type zeolite molecular sieve [(Li,Ca)-LSX] preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102874837A (en) * | 2011-07-11 | 2013-01-16 | 中国石油化工股份有限公司 | Preparation method of low silica aluminium molecular sieve LSX directly synthesized from kaolin |
| CN103539150A (en) * | 2013-10-15 | 2014-01-29 | 北京工业大学 | Low-silica-alumina-ratio X-type zeolite molecular sieve [(Li,Ca)-LSX] preparation method |
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