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Preparation method of magnetic material for removing dibenzothiophene from oil

A technology of dibenzothiophene and magnetic material, which is applied in the field of environmental pollution control chemistry, can solve the problems of reducing gasoline octane number environmental pollution, high price of adsorption materials, low selectivity, etc., and achieves improved imprinting function, convenient and rapid separation, The effect of high adsorption selectivity

Active Publication Date: 2012-09-19
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The adsorption desulfurization method has the advantages of good desulfurization effect, mild operating conditions, low investment and operating costs, no reduction in octane number of gasoline, many types of adsorbents to choose from, regenerated adsorbents, and less environmental pollution. Development is the key technology. Although there are many kinds of adsorbent materials developed at present, they all have their own shortcomings. In summary, there are mainly the following defects: first, separation is difficult, second, the selectivity is not high, and third, the price of adsorbent materials is high

Method used

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  • Preparation method of magnetic material for removing dibenzothiophene from oil
  • Preparation method of magnetic material for removing dibenzothiophene from oil
  • Preparation method of magnetic material for removing dibenzothiophene from oil

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preparation example Construction

[0016] The preparation method of the present invention is divided into four steps, followed by ferric oxide (Fe 3 o 4 ) the synthesis of magnetic nanoparticles, the coating of oleic acid on the surface of ferric oxide nanoparticles, the coating of molecular imprinted layer on the surface of oleic acid, and the elution of template dibenzothiophene (DBT) and the generation of recognition sites, as follows:

[0017] Step 1: Prepare superparamagnetic Fe3O4 nanoparticles by co-precipitation method. The Fe3O4 nanoparticles to be prepared must be smaller than 25nm to ensure their superparamagnetism. Therefore, weigh 0.5-2.5g of ferrous chloride tetrahydrate and 3-8g of ferric chloride hexahydrate, dissolve them in 40-80ml of water, stir for 10-60min under the protection of nitrogen, and at the same time add 5-20ml of Ammonia, continue to stir under the protection of nitrogen for 10-60min. The above solution is washed to neutrality, and can be washed to neutrality with distilled wat...

Embodiment 1

[0025] Using 4-vinylpyridine (4-VP) as the functional monomer, dibenzothiophene (DBT) as the template molecule, and ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent, the surface modified 4-VP Ferric oxide was used as the loading matrix, and molecularly imprinted polymers on the surface of magnetic materials were synthesized. Accurately weigh 0.1843g of dibenzothiophene (DBT) and 0.425ml of 4-vinylpyridine (4-VP) and dissolve them in 10ml of toluene, and stir for 1 hour to prepare a pre-assembly solution. 16mmol of cross-linking agent ethylene glycol dimethacrylate and pre-assembly solution were added to ferric oxide coated with oleic acid prepared in advance, and the mixed solution was ultrasonicated for 15 min at room temperature to prepare a pre-polymer solution. Dissolve 0.2g of polyvinylpyrrolidone (PVP) in 10ml of toluene, stir at 300rpm, pass nitrogen to remove oxygen, and heat to 60°C. Add 0.05g of azobisisobutyronitrile (AIBN) and prepolymer, and reac...

Embodiment 2

[0027]Using 4-vinylpyridine (4-VP) as the functional monomer, dibenzothiophene (DBT) as the template molecule, and ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent, the surface modified 4-VP Ferric oxide was used as the loading matrix, and molecularly imprinted polymers on the surface of magnetic materials were synthesized, and 0.3686g of dibenzothiophene (DBT) and 0.85ml of 4-vinylpyridine (4-VP) were accurately weighed and dissolved in 100ml of toluene . After stirring for 2 hours, a pre-assembly solution was made. 40 mmol of crosslinking agent ethylene glycol dimethacrylate (EGDMA) and pre-assembly solution were added to the pre-prepared ferric iron tetroxide coated with oleic acid, and the mixed solution was ultrasonicated for 30 min to prepare a pre-polymer solution. Dissolve 0.8g of polyvinylpyrrolidone (PVP) in 100ml of toluene, stir at 300rpm, pass nitrogen to remove oxygen, and heat to 60°C. Add 0.2g of azobisisobutyronitrile (AIBN) and prepolymer, ...

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Abstract

The invention discloses a preparation method of a magnetic material for removing dibenzothiophene from oil. The method comprises the following steps of: preparing magnetic nanometer ferroferric oxide; preparing into a pre-assembled solution; dissolving polyvinyl pyrrolidone into a methylbenzene solution; adding azodiisobutyronitrile and a prepolymer solution to obtain a polymer; separating the obtained polymer in an external magnetic field; and putting into a mixed solution of methanol and glacial acetic acid to obtain a magnetic material. Compared with the conventional molecular engram material, a ferroferric oxide magnetic molecular engram polymer magnetic material which is synthesized by taking tetravinyl pyridine as a functional monomer, taking dibenzothiophene as a template molecule, taking ethylene glycol ethylene dimethacrylate as a crosslinking agent and taking oleic acid-coated ferroferric oxide as a load substrate with a surface molecular engram technology has the advantages of uniform particle, high mechanical strength and no need of complex steps during suction filtration and centrifugal separation, has certain adsorption volume and adsorption selectivity to dibenzothiophene in oil, and is a novel material which is low in price and is convenient and rapid for separating.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control chemistry, and in particular relates to a preparation method of a molecularly imprinted polymer on the surface of ferric iron tetroxide nanoparticle magnetic material, which is used for absorbing dibenzothiophene in oil products. Background technique [0002] A large amount of SOx produced during the combustion of sulfur-containing compounds in oil is one of the main reasons for the formation of acid rain and large-scale environmental pollution, which seriously threatens human health and the ecological balance of the earth. As the international community attaches great importance to the sulfur calibration of transported oil products, the refining requirements for heavy crude oil products continue to increase, and direct deep desulfurization has become increasingly urgent. Dibenzothiophenes are important organic sulfur compounds in gasoline and diesel, but they are difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F226/06C08F2/44C08K3/22C08J9/28B01J20/26B01J20/30C10G25/00H01F1/42
Inventor 徐婉珍李慧周威杨文明黄卫红
Owner JIANGSU UNIV
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