CN105289466A - Absorbent for absorbing and separating polyaromatic hydrocarbon in diesel and preparation method thereof - Google Patents
Absorbent for absorbing and separating polyaromatic hydrocarbon in diesel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an absorbent for absorbing and separating polyaromatic hydrocarbon in diesel and a preparation method thereof. The absorbent is characterized by comprising silica gel capable of adjusting an aperture or metal-loaded modified silica gel. The preparation method of the absorbent comprises the following steps: (1) mixing a sodium silicate solution with inorganic acid to form glue, and aging, washing and drying the glue to obtain high-purity silica gel; (2) washing the silica gel by utilizing an appropriate amount of alkaline solution or inorganic acid solution, and directionally adjusting pores of the silica gel; and (3) contacting the silica gel with a metal solution to perform metal modification, and preparing the silica gel or metal modified silica gel absorbent. The absorbent has high adsorption capacity for the polyaromatic hydrocarbon in the diesel, can effectively absorb and separate the polyaromatic hydrocarbon in the diesel and is relatively high in selectivity and reusable.
Description
Technical field
The present invention relates to adsorbent and the preparation method of polycyclic aromatic hydrocarbon in a kind of adsorbing separation diesel oil.
Background technology
Polycyclic aromatic hydrocarbon refers to the aromatic compound containing two or more phenyl ring, comprises the multiple compounds such as naphthalene, anthracene, phenanthrene, pyrene, is extensively present in diesel oil.Research shows, the polycyclic aromatic hydrocarbon Cetane number in diesel oil is low, and combustibility is poor, be the one of the main reasons that exhaust gas from diesel vehicle PM2.5 particle is formed, and the particle containing polycyclic aromatic hydrocarbon has toxicity, causes mutagenicity and carcinogenicity.Along with environmental protection standard improves, the standard of derv fuel is also come, China has has made and issued state III, state IV, state V diesel oil standard, China will implement in full state V diesel oil standard in 2017, restriction polycyclic aromatic hydrocarbon content≤11%, started to formulate state VI diesel oil standard, expectation more strictly will limit polycyclic aromatic hydrocarbon content.
For China's oil refining industry, crude quality is poor, and based on mink cell focus, poor oil, especially polycyclic aromatic hydrocarbon content is high to cause arylhydrocarbon in diesel oil.Secondly, China's oil refining secondary operations is based on catalytic cracking, coking, and catalytic cracking diesel oil and coker gas oil proportion in diesel pool is higher, catalytic cracking diesel oil and coker gas oil polycyclic aromatic hydrocarbon content higher, cause diesel oil polycyclic aromatic hydrocarbon content high.
From long term growth, realizing diesel oil upgrading, complying with national energy-saving reduction of discharging development strategy is inexorable trend, exploitation clean diesel production technology promote diesel oil upgrading be current needed for, diesel vehicle is as important mobile pollution source, oil product upgrading significantly will reduce pollutant emission, improve air quality, significant.
A kind of effective ways reducing polycyclic aromatic hydrocarbon content in diesel oil are adsorbing and removing polycyclic aromatic hydrocarbons.
CN103483394A discloses a kind of organic coordination compound adsorbent for adsorbing and removing polycyclic aromatic hydrocarbon and preparation method thereof.This adsorbent is a kind of metal-organic framework materials, specifically the organic coordination compound of body centered by metallic zinc, and cell parameter is one-dimensional crystal.Disclosed adsorbent has good adsorbing separation effect to polycyclic aromatic hydrocarbon, can micro polycyclic aromatic hydrocarbon in adsorbed water effectively.
CN100340641C discloses a kind of aromatic hydrocarbons method in purifying liquefied coal coil, adopt extracting and Adsorption Phase associated methods aromatics separation, wherein silica gel is adopted to be adsorbent, take alkylbenzene as strippant, adsorbing separation aromatic compound, this adsorption method adsorption temp 60 ~ 100 DEG C, desorption temperature 10 ~ 50 DEG C, desorption time 20 ~ 60min, after adsorbing separation, diesel component arene content is reduced to less than 20%, and isolated aromatic component arene content is greater than 90%.
Current polycyclic aromatic hydrocarbon adsorbent is mainly for micro polycyclic aromatic hydrocarbon adsorbing separation in air or water, adsorbent saturated extent of adsorption is less, and it is selective poor for the aromatics absorption agent of liquefied coal coil, its mononuclear aromatics compounds in easy absorption diesel oil, is not suitable for polycyclic aromatic hydrocarbon adsorbing separation in diesel oil.
Summary of the invention
Technical problem to be solved by this invention overcomes the deficiencies in the prior art, provides a kind of adsorbent containing silica gel or metal-modified silica gel, and this adsorbent has higher selective to polycyclic aromatic hydrocarbon, effectively can reduce the polycyclic aromatic hydrocarbon in diesel oil; The other technical problem that the present invention will solve is to provide the preparation of described adsorbent and the application process of adsorbing separation polycyclic aromatic hydrocarbon.
An adsorbent for polycyclic aromatic hydrocarbon in adsorbing separation diesel oil, this adsorbent comprises silica gel or metal-modified silica gel, and described silica gel pore volume is 0.4cm
3/ g ~ 1.9cm
3/ g, average pore size is 4 ~ 30nm, and preferred pore volume is 0.6 ~ 1.6cm
3/ g, average pore size is 6 ~ 25nm; The modified metal of described metal-modified silica gel is transition metal, alkaline-earth metal or other metallic elements, is preferably Cu, Ni, Mg, Al, Fe, Co, Cr, Ba, Ag one or more.
A preparation method for the adsorbent of polycyclic aromatic hydrocarbon in above-mentioned adsorbing separation diesel oil, comprises the following steps:
(1) with silicate and inorganic acid for Material synthesis silica gel, adopt mass concentration to be 5% ~ 20% silicate solutions, mix obtained collosol and gel with inorganic acid, aging 1 ~ 20 hour of constant temperature at 25 ~ 95 DEG C, dry through washing, high-purity silica gel carrier can be obtained;
(2) silica-gel carrier aperture modulation, the preparation inorganic acid of 5% ~ 30% mass concentration or aqueous slkali, by carrier silica gel immersion treatment 1 ~ 10 hour at 30 ~ 90 DEG C, between modulation silica gel average pore size 4 ~ 30nm.
In preparation method of the present invention, also comprise step (3), modified metal soluble-salt is dissolved in the obtained 0.01 ~ 0.5mol/L metal salt solution of deionized water, incipient impregnation silica gel, 1 ~ 24 hour is left standstill at 25 ~ 60 DEG C, then dry at 90 ~ 150 DEG C, at 550 DEG C, high-temperature roasting 2 ~ 6 hours, namely obtains metal-modified silica gel.
Step (1) described silicate solutions is sodium metasilicate, preferred mass concentration is 8% ~ 18%, inorganic acid is one or more in sulfuric acid, hydrochloric acid, nitric acid, and the mol ratio of inorganic acid and sodium metasilicate is 1:100 ~ 35:100, and preferred molar ratio is 5:100 ~ 30:100.
Described in step (2), inorganic acid is preferably one or more in sulfuric acid, hydrochloric acid, nitric acid, and described alkali is one or both in NaOH, potassium hydroxide, and the mol ratio of inorganic acid or alkali and sodium metasilicate is 1:100 ~ 35:100.
Modified metal salt described in step (3) is one or several in magnesium nitrate, aluminum nitrate, copper nitrate, nickel nitrate, cobalt nitrate, chromic nitrate, zinc nitrate, calcium chloride, potassium chloride, aluminium chloride.
Present invention also offers the application of a kind of adsorbent of the present invention in adsorbing separation diesel oil in polycyclic aromatic hydrocarbon, it is characterized in that, the adsorption temp of described adsorption process is 35 ~ 100 DEG C, adsorptive pressure 0.1 ~ 1.5MPa, polycyclic aromatic hydrocarbon strippant is one or more in benzene, toluene, cyclohexane, hexahydrotoluene, ethanol, methyl alcohol, and desorption temperature is 50 ~ 150 DEG C.
The preparation method of adsorbent of the present invention is preferably:
(1) sol-gal process synthesized silicon rubber: 10wt% ~ 25wt% sodium silicate solution is mixed with 15wt% ~ 40wt% sulfuric acid solution, form colloidal sol, the mol ratio of sulfuric acid and sodium metasilicate is 1:2 ~ 1:4, gel ageing time is 1 ~ 10 hour, aging temperature is 30 ~ 90 DEG C, aging rear washing spraying dry;
(2) the directed pore size controlling of silica gel: the NaOH of silica gel particle and 5wt% ~ 30% or potassium hydroxide basic solution soak and suitably reduces pore, or adopt 5wt% ~ 30wt% hydrochloric acid, sulfuric acid or salpeter solution to soak and suitably reduce pore, solution soaking temperature is 30 ~ 95 DEG C, and soak time is 1 ~ 8 hour;
(3) 0.05 ~ 0.5mol/L metal salt solution is prepared, as copper nitrate solution, magnesium nitrate solution, liquor alumini chloridi etc., take the rear silica gel of 100g activation, the metallic solution prepared dropwise being added step (2) obtains in silica gel, when step 2) silica gel that obtains infiltrates saturated, stops adding solution when no longer absorbing moisture, leave standstill 1 ~ 12 hour at 90 ~ 150 DEG C to dry, last high-temperature roasting activation at 350 ~ 550 DEG C, i.e. obtained described adsorbent.
In adsorbing separation diesel oil of the present invention, the adsorbent of polycyclic aromatic hydrocarbon compared with prior art, and this adsorbent has higher selective to polycyclic aromatic hydrocarbon, effectively can reduce the polycyclic aromatic hydrocarbon in diesel oil.
Detailed description of the invention
In adsorbent of the present invention, pore size is 4 ~ 30nm, is preferably 6 ~ 25nm, and described modified metal is one or more of common Cu, Ni, Mg, Al, Fe, Co, Cr, Ba, Ag, is preferably one or more in Mg, Al, Ba and Cu.
Silica gel of the present invention can be prepared according to the method for the invention, also can conventionally prepare, silica gel prepared by such as patent CN100443406C, CN1081608C, but is preferably the silica gel prepared of the present invention.
In sorbent preparation method provided by the invention, step (1) is described is conveniently sol-gel method synthesized silicon rubber, refer to according to the sol method that adopts of the conventional silica gel of synthesis, generally include silicate, step that inorganic acid is mixed to form colloidal sol, the present invention does not have particular/special requirement.
The present inventor finds, utilize acid-base solution can carry out directed modulation to pore, soak suitably can reduce pore with finite concentration acid solution, the aperture of silica gel can be increased with certain aqueous slkali soaking, and the amplitude of aperture modulation is directly proportional to solution concentration, soaking temperature, soak time, the above factor of conservative control can carry out orientation regulation and control to pore, the silica gel with specific average pore size directly as adsorbent, also can proceed the metal-modified silica gel absorber of metal-modified preparation.
The present inventor finds, have the silica gel of certain pore size distribution, aperture 4 ~ 30nm, and metal-modified silica gel all has selective absorption effect to polycyclic aromatic hydrocarbon, and polycyclic aromatic hydrocarbon adsorbent is preferably metal-modified silica gel.
Silica gel metal modifying method provided by the present invention, silica gel adopts equi-volume impregnating, the aqueous solution of preparation containing metal soluble-salt in advance, the molar concentration of metal ion in solution is 0.01 ~ 0.5mol/L, dipping temperature is 25 ~ 60 DEG C, metal salt solution is dropwise added in silica gel, until silica gel no longer absorbs water, also the saturated water absorption of silica gel can be measured in advance, calculate required liquor capacity, dipping terminates rear stirring and leaves standstill 1 ~ 8 hour, then dry at 90 ~ 150 DEG C, last roasting 2 ~ 6 hours at 350 DEG C ~ 550 DEG C, namely obtains described adsorbent.
Modified metal of the present invention, for one or more of Cu, Ni, Mg, Al, Fe, Co, Cr, Ba, Ag, described soluble metallic salt is its nitrate or chlorate, does not limit anion species, is preferably one or more in magnesium nitrate, copper nitrate, aluminum nitrate and magnesium chloride.
Adsorbing and removing polycyclic aromatic hydrocarbon method provided by the present invention, diesel oil and adsorbent Contact-sorption at 50 ~ 150 DEG C is separated, polycyclic aromatic hydrocarbon is stayed in adsorbent, one or more in employing benzene, toluene, cyclohexane, hexahydrotoluene, methyl alcohol, ethanol are as strippant, flush out polycyclic aromatic hydrocarbon, so repeatedly from diesel oil, adsorbing separation can go out polycyclic aromatic hydrocarbon.
The method of evaluating performance of adsorbent of the present invention is as follows:
100g adsorbent is loaded the Fixed Be with Pulse adsorption/desorption device containing quantity tube, first pretreatment is carried out to adsorbent, activation condition is: temperature 100 ~ 550 DEG C, heating rate is 5 ~ 10 DEG C/min, keep 1 ~ 4 hour at 250 DEG C, keep 1 ~ 4 hour at 350 ~ 550 DEG C, nitrogen (or argon gas) flow velocity is 30 ~ 220mL/min.Activation terminates rear reduction bed temperature to 50 ~ 120 DEG C, carry out the experiment of diesel oil polycyclic aromatic hydrocarbon adsorbing separation, absorption separation condition is: temperature 50 ~ 150 DEG C, pressure is 0.5 ~ 2MPa, diesel oil quantity tube volume 6 ~ 20ml, adopt strippant to adsorption column pre-wet, drain in post and rotate six-way valve after bubble, quantity tube diesel oil is entered adsorption column, continuous regular sampling analysis, product liquid composition is analyzed with gas chromatograph and chromatograph-mas spectrometer, first the component polycyclic aromatic hydrocarbon content collected is lower, be designated as clean diesel component, analyze and calculate product polycyclic aromatic hydrocarbon content, calculate polycyclic aromatic hydrocarbon removal efficiency, when adsorption column outlet polycyclic aromatic hydrocarbon obviously increases, be designated as aromatic component, analyze polycyclic aromatic hydrocarbon content in component.
Polycyclic aromatic hydrocarbon quality in clean diesel component polycyclic aromatic hydrocarbon content=clean diesel component/clean diesel component gross mass × 100%
Polycyclic aromatic hydrocarbon gross mass × 100% in clean diesel component polycyclic aromatic hydrocarbon removal efficiency=(polycyclic aromatic hydrocarbon gross mass in raw material diesel oil-clean diesel component polycyclic aromatic hydrocarbon quality)/raw material diesel oil
Below by example, this invention process is described, but is not limited only to these examples.
Diesel oil used in embodiment is simulation diesel oil, containing decahydronaphthalene, hexadecane, detergent alkylate, naphthalene, methyl naphthalene, naphthane multiple compounds.The content of polycyclic aromatic hydrocarbon adopts gas chromatography GC and chromatograph-mass spectrometer GC-MS to measure.
Embodiment 1
(1) first by 1000g concentration be rare water glass solution of 16.8% (sodium metasilicate mass fraction), constant temperature half an hour at 50 DEG C, slowly adding 340g mass fraction is 12% dilution heat of sulfuric acid, adjust ph to 6.5 ~ 7.0, to form after colloidal sol at 50 DEG C aging 3 hours, through filtration washing, at 100 ~ 120 DEG C dry 12 hours, high-temperature roasting 4 hours at 550 DEG C again, obtains carrier silica gel.
(2) pore modulation: take 6.88g NaOH (Chemical Reagent Co., Ltd., Sinopharm Group, analyze pure, 96wt%) be dissolved in 500ml deionized water, get 500ml sodium hydroxide solution, stir at 60 DEG C, slowly add the carrier silica gel of 100g step (1), at 60 DEG C, constant temperature stirs 6 hours, through filtration washing to pH=7 ~ 8, and drying 12 hours at 100 ~ 120 DEG C, at 550 DEG C, high-temperature roasting 4 hours, obtains modified silica-gel.
(3) metal-modified: by 4.19g copper nitrate slaine (Cu (NO
3)
23H
2o, analyze pure, 99wt%) be dissolved in 130ml deionized water, form copper nitrate solution, copper nitrate solution is dropwise added 100g modified silica-gel, slowly drips, hold over night after stirring, at 100 ~ 120 DEG C dry 12 hours, then high-temperature roasting 4 hours at 550 DEG C, obtain metal-modified silica gel absorber.Adopt x-ray fluorescence method to measure tenor in metal-modified silica gel absorber, the results are shown in subordinate list 2.
(4) performance of the adsorbent evaluation: adopt Fixed Be with Pulse adsorption column, adsorbent filling 100ml, simulation diesel oil is raw material, raw material composition analysis sees attached list 1, Pulsed Sampling amount 7ml, first adsorption column is soaked with cyclohexane, cyclohexane is passed into constant pump speed 1.2ml/min, keep adsorption column temperature at about 65 DEG C, adsorption column pressure 0.1 ~ 1.5MPa, after adsorption column complete wetting, switch six-way valve and the pulse of simulation diesel oil is entered adsorption column, within every 5 minutes, collect sample, detect polycyclic aromatic hydrocarbon content, from pass into simulation diesel oil to detecting that a large amount of polycyclic aromatic hydrocarbon is adsorption section, the sample collected in this stage is designated as clean diesel component, from detecting that a large amount of polycyclic aromatic hydrocarbon is reduced to 0 for desorption section gradually to polycyclic aromatic hydrocarbon content, the sample collected in this stage is polycyclic aromatic hydrocarbon component, analytical calculation polycyclic aromatic hydrocarbon content.Adsorbent evaluation sees attached list 2.
Embodiment 2
(1) synthesis of carrier silica gel is identical with embodiment 1.
(2) pore modulation: take the 16.5g concentrated sulfuric acid (98%, analyze pure, 96wt%) be diluted to 500ml by deionized water, get 500ml sulfuric acid solution, stir at 60 DEG C, slowly add the carrier silica gel of 100g step (1), modified condition is identical with embodiment 1,.
(3) metal-modified identical with embodiment 1.
(4) performance of the adsorbent evaluation is identical with embodiment 1, and adsorbent evaluation is in table 2.
Embodiment 3
(1) synthesis of carrier silica gel is identical with embodiment 1.
(2) pore modulation: remove ionized water 500ml, stirs at 60 DEG C, slowly adds the carrier silica gel of 100g step (1), and modified condition is identical with embodiment 1.
(3) metal-modified identical with embodiment 1.
(4) performance of the adsorbent evaluation is identical with embodiment 1, and adsorbent evaluation is in table 2.
Embodiment 4
(1) synthesis of carrier silica gel is identical with embodiment 1.
(2) pore modulation is identical with embodiment 2.
(3) metal-modified: by 11.87g magnesium nitrate slaine (Mg (NO
3)
26H
2o, analyze pure, 99wt%) be dissolved in 130ml deionized water, form magnesium nitrate solution, magnesium nitrate solution is dropwise added 100g modified silica-gel, slowly drips, hold over night after stirring, at 100 ~ 120 DEG C dry 12 hours, then high-temperature roasting 4 hours at 550 DEG C, obtain metal-modified silica gel absorber.X-ray fluorescence method is adopted to measure tenor in metal-modified silica gel absorber.
(4) performance of the adsorbent evaluation is identical with embodiment 1, and adsorbent evaluation is in table 2.
Embodiment 5
(1) synthesis of carrier silica gel is identical with embodiment 1.
(2) pore modulation: take the 33g concentrated sulfuric acid (98%, analyze pure, 96wt%) be diluted to 500ml by deionized water, get 500ml sulfuric acid solution, stir at 60 DEG C, slowly add the carrier silica gel of 100g step (1), modified condition is identical with embodiment 1.
(3) metal-modified: by 21.05g aluminum nitrate slaine (Al (NO
3)
39H
2o, analyze pure, 99wt%) be dissolved in 130ml deionized water, form aluminum nitrate solution, aluminum nitrate solution is dropwise added 100g modified silica-gel, slowly drips, hold over night after stirring, at 100 ~ 120 DEG C dry 12 hours, then high-temperature roasting 4 hours at 550 DEG C, obtain metal-modified silica gel absorber.X-ray fluorescence method is adopted to measure tenor in metal-modified silica gel absorber.
(4) performance of the adsorbent evaluation is identical with embodiment 1, and adsorbent evaluation is in table 2.
Embodiment 6
(1) synthesis of carrier silica gel is identical with embodiment 1.
(2) pore modulation is identical with embodiment 2.
(3) performance of the adsorbent evaluation is identical with embodiment 1, and adsorbent evaluation is in table 2.
Embodiment 7 (comparative example)
(1) (specific area is 325m to adsorbent employing Qingdao silochrom
2/ g, average pore size is 11nm).
(2) performance of the adsorbent evaluation is identical with embodiment 6, and adsorbent evaluation is in table 2.
Diesel raw material composition simulated by table 1
| Mononuclear aromatics is containing wt% | Polycyclic aromatic hydrocarbon content wt% | Non-aromatic content wt% |
| 27.6 | 17.2 | 55.2 |
As can be seen from Table 2, adsorbent can reduce the polycyclic aromatic hydrocarbon content in simulation diesel oil.
The evaluation result of the different adsorbent of table 2
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Metal species | Cu | Cu | Cu | Mg | Al | - | - |
| Metal ladings, w% | 1.48 | 1.53 | 1.39 | 1.58 | 1.32 | - | - |
| Adsorbent specific area, m 2/g | 196 | 359 | 305 | 376 | 421 | 362 | 319 |
| Average pore size, nm | 14 | 8 | 10 | 8 | 6 | 8 | 10 |
| Clean diesel polycyclic aromatic hydrocarbon content, wt% | 2.76 | 1.42 | 2.14 | 1.78 | 3.19 | 3.53 | 3.68 |
| Polycyclic aromatic hydrocarbon removal efficiency, % | 83.95 | 91.74 | 87.56 | 89.65 | 81.45 | 79.48 | 78.60 |
Claims (9)
1. the adsorbent of polycyclic aromatic hydrocarbon in adsorbing separation diesel oil, it is characterized in that, described adsorbent comprises silica gel or metal-modified silica gel, and described silica gel pore volume is 0.4cm
3/ g ~ 1.9cm
3/ g, average pore size is 4 ~ 30nm, and the modified metal of described metal-modified silica gel is transition metal, alkaline-earth metal or other metallic elements.
2. adsorbent according to claim 1, is characterized in that, described silica gel pore volume is 0.6 ~ 1.6cm
3/ g, average pore size is 4 ~ 30nm, and modified metal is one or more of Cu, Ni, Mg, Al, Fe, Co, Cr, Ba, Ag.
3. the preparation method of the adsorbent of polycyclic aromatic hydrocarbon in adsorbing separation diesel oil according to claim 1, comprises the following steps:
(1) with silicate and inorganic acid for Material synthesis silica gel, adopt mass concentration to be 5% ~ 20% silicate solutions, mix obtained collosol and gel with inorganic acid, aging 1 ~ 20 hour of constant temperature at 25 ~ 95 DEG C, dry through washing, high-purity silica gel carrier can be obtained;
(2) silica-gel carrier aperture modulation, the preparation inorganic acid of 5% ~ 30% mass concentration or aqueous slkali, by carrier silica gel immersion treatment 1 ~ 10 hour at 30 ~ 90 DEG C, modulation silica gel average pore size is between 4 ~ 30nm.
4. preparation method according to claim 3, it is characterized in that, also comprise step (3), modified metal soluble-salt is dissolved in the obtained 0.01 ~ 0.5mol/L metal salt solution of deionized water, the silica gel that incipient impregnation step (2) obtains, leaves standstill 1 ~ 24 hour at 25 ~ 60 DEG C, then dries at 90 ~ 150 DEG C, at 550 DEG C, high-temperature roasting 2 ~ 6 hours, namely obtains metal-modified silica gel.
5. preparation method according to claim 3, it is characterized in that, step (1) described silicate solutions is sodium metasilicate, its mass concentration is 8% ~ 18%, inorganic acid is one or more in sulfuric acid, hydrochloric acid, nitric acid, inorganic acid and sodium metasilicate mol ratio be 1:100 ~ 35:100.
6. preparation method according to claim 5, is characterized in that, the mol ratio of inorganic acid and sodium metasilicate is 5:100 ~ 30:100.
7. preparation method according to claim 3, it is characterized in that, inorganic acid described in step (2) is one or more in sulfuric acid, hydrochloric acid, nitric acid, described alkali is one or both in NaOH, potassium hydroxide, and the mol ratio of inorganic acid or alkali and sodium metasilicate is 1:100 ~ 35:100.
8. preparation method according to claim 4, it is characterized in that, modified metal salt described in step (3) is one or several in magnesium nitrate, aluminum nitrate, copper nitrate, nickel nitrate, cobalt nitrate, chromic nitrate, zinc nitrate, calcium chloride, potassium chloride, aluminium chloride.
9. the application of adsorbent according to claim 1 in adsorbing separation diesel oil in polycyclic aromatic hydrocarbon, it is characterized in that, the adsorption temp of described adsorption process is 35 ~ 100 DEG C, adsorptive pressure 0.1 ~ 1.5MPa, polycyclic aromatic hydrocarbon strippant is one or more in benzene, toluene, cyclohexane, hexahydrotoluene, ethanol, methyl alcohol, and desorption temperature is 50 ~ 150 DEG C.
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