SiO2@PEI composite aerogel as well as preparation method and application thereof
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A composite aerogel and gel technology, applied in the field of aromatic hydrocarbon processing, can solve problems such as low energy consumption and achieve the effect of improving adsorption performance
Pending Publication Date: 2021-11-30
ZHEJIANG UNIV OF TECH
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Therefore, it is very important to develop a simple and gentle method with low energy consumption and deep removal of thiophene sulfides. Adsorption desulfurization is a desulfurization method that meets the above requirements. At present, in the field of aromatic hydrocarbon desulfurization, there are few Report on the way of adsorption desulfurization
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Embodiment 1
[0027] Example 1: SiO with a feed ratio of PEI and tetraethyl orthosilicate of 1:100 2 @PEI Composite aerogels. Its preparation method is as follows:
[0028] 1) Polyethyleneimine is configured as 5% PEI aqueous solution;
[0029] 2) Put 10ml of ethanol, 8ml of tetraethyl orthosilicate and 2ml of water in a beaker, adjust its pH to about 2, stir at room temperature for 1.5h, and hydrolyze it to obtain an alcohol sol;
[0030] 3) Take 0.308 g of the PEI solution in step 1) and slowly add it to the alcohol sol obtained in step 2), and continue to stir for 10 minutes to mix it evenly to obtain a composite alcohol sol;
[0031] 4) Add 10% ammonia water to the composite alcohol sol obtained in step 3), adjust the pH to about 6, let it stand at room temperature, and wait for it to gel to obtain SiO 2 @PEI composite airgel;
[0032]5) Add 40ml of a mixed solution of tetraethyl orthosilicate and ethanol with a volume ratio of 15:25 to the composite airgel obtained in step 4), and ...
Embodiment 2-5
[0037] Example 2-5 SiO with PEI and tetraethyl orthosilicate ratios of 1:200, 1:300, 1:400, 1:500 respectively 2 @PEI Composite Airgel
[0038] The preparation steps and penetration adsorption experiment are the same as in Example 1, except that the quality of the PEI solution in Example 2 is 0.154g, the quality of the PEI solution in Example 3 is 0.103g, and the quality of the PEI solution in Example 4 is 0.077g. The mass of medium PEI is 0.0616g.
Embodiment 6-10
[0059] Embodiment 6-10: different space velocity to SiO 2 The effect of @PEI composite airgel on the sulfur adsorption performance of thiophenes in benzene solution. Select the SiO prepared by embodiment 4 2 @PEI Composite Airgel, the operation of the penetration adsorption experiment is the same as in Example 1-5, the difference is that the space velocity of the benzene solution is 1h respectively -1 ,2 -1 、4 -1 ,8 -1 、10 -1 .
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Abstract
The invention discloses SiO2@PEI composite aerogel as well as a preparation method and application thereof. The SiO2@PEI composite aerogel is obtained by taking tetraethoxysilane as a raw material and introducing polyethyleneimine for modification, the invention further discloses application of the composite aerogel to adsorption of thiophene sulfides in an aromatic hydrocarbon solution, and particularly, the composite aerogel is quantitatively filled into a fixed bed adsorption device. And the composite aerogel is injected into an aromatic hydrocarbon solution containing thiophene sulfides under the conditions of normal temperature and certain air speed, and adsorbing the thiophene sulfides are absorbed in the aromatic hydrocarbon solution by the composite aerogel to obtain the adsorbed aromatic hydrocarbon solution. The composite aerogel material has the advantages of being simple in preparation method, low in cost, capable of being repeatedly used, environmentally friendly, mild in operation condition and the like, has good adsorption performance on thiophene sulfides and good selectivity on the thiophene sulfides, and has good application prospects in the field of aromatic hydrocarbon desulfurization.
Description
technical field [0001] The invention belongs to the technical field of aromatic hydrocarbon processing, and in particular relates to a SiO2@PEI composite airgel, a preparation method thereof, and the application of thiophene sulfides in the adsorption and detachment of aromatic hydrocarbons. Background technique [0002] Aromatic hydrocarbons, such as benzene, toluene, xylene, ethylbenzene, and cumene, are very important basic organic chemical raw materials. Benzene and ethylene can undergo alkylation reaction under the action of molecular sieve catalyst to generate ethylbenzene, and ethylbenzene can be directly dehydrogenated or oxidatively dehydrogenated under the action of catalyst to generate styrene, which is used as a monomer of polystyrene and ABS resin; Benzene and propylene undergo alkylation reaction under the action of molecular sieve catalyst to generate cumene, which is further oxidized to generate cumene hydroperoxide, which can be decomposed under the action o...
Claims
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