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Method for extracting catalyst for 2,6-dimethylnaphthalene from coal tar

A technology of dimethylnaphthalene and catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low conversion rate of 2,6-DMN , to achieve the effect of improved recovery rate and simple operation

Inactive Publication Date: 2014-08-13
韩钊武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for extracting 2,6-methylnaphthalene from coal tar in order to solve the problem that the conversion rate of 2,6-DMN is not high in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1. Add diatomaceous earth to 3mol / L nitric acid solution, mix, stir, and heat to 100°C at the same time, stir at constant temperature for one hour, then cool to room temperature, filter, and dry the solid particles to obtain acid-washed diatom Earth; the mass ratio of diatomite to acid solution is 1:3;

[0025] Step 2. Place the acid-washed diatomite obtained in Step 1 in a tube furnace, heat up to 300° C. and activate it at a constant temperature for 1 hour, then feed water vapor at a flow rate of 3 ml / min, and treat for 6 hours. Then raise the temperature at 3°C / min to 500°C at a constant rate, and roast for 3 hours to obtain activated diatomite;

[0026] Step 3. Add 10ml of 1mol / L platinum chloride solution dropwise onto the activated diatomite obtained in step 2, and after standing for 12 hours, dry at 80°C and cool to room temperature to obtain Pt-loaded diatomite;

[0027] Step 4: Add 1 mol / L nickel sulfate solution dropwise to the Pt-loaded diatomaceous ear...

Embodiment 2

[0031] Step 1. Add diatomite to 2mol / L hydrochloric acid solution, mix, stir, and heat to 200°C at the same time, stir at constant temperature for 2 hours, then cool to room temperature, filter, and dry the solid particles to obtain acid-washed diatomite ; The mass ratio of diatomite to acid solution is 1: 10;

[0032] Step 2: Place the acid-washed diatomite obtained in Step 1 in a tube furnace, raise the temperature to 450° C. and activate it at a constant temperature for 2 hours, then feed water vapor at a flow rate of 6 ml / min, and treat for 4 hours. Then increase the temperature at 3°C / min to 650°C at a constant rate, and roast for 2 hours to obtain activated diatomite;

[0033] Step 3. Add 15ml of 2mol / L platinum sulfite solution dropwise to the activated diatomite obtained in step 2, and after standing for 12 hours, dry at 100°C and cool to room temperature to obtain Pt-loaded diatomite;

[0034] Step 4: Add 3 mol / L nickel nitrate solution dropwise onto the Pt-loaded di...

Embodiment 3

[0038] Step 1. Mix diatomite with 3mol / L sulfuric acid, stir, and heat to above 150°C at the same time, stir at constant temperature for 3 hours, then cool to room temperature, filter, and dry the solid particles to obtain acid-washed diatomite; The mass ratio of algae and acid solution is 1:8;

[0039] Step 2. Place the acid-washed diatomite obtained in step 1 in a muffle furnace, raise the temperature to 380°C for constant temperature activation, then feed water vapor at a flow rate of 4ml / min; then raise the temperature to 580°C at a constant rate, and roast 4h, to obtain activated diatomaceous earth;

[0040]Step 3. Add 3 mol / L platinum nitrate solution dropwise to the activated diatomite obtained in step 2. After standing for 24 hours, dry at 100° C. and cool to room temperature to obtain Pt-loaded diatomite;

[0041] Step 4: Add 4 mol / L nickel bromide solution dropwise onto the Pt-loaded diatomite obtained in Step 3, let it stand for 24 hours, dry at 120°C, and cool to ...

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Abstract

The invention relates to a method for extracting a catalyst for 2,6-dimethylnaphthalene from coal tar, belonging to the field of catalysis in chemical industry. The method comprises the following steps: washing kieselguhr which is used as a supporter with acid, carrying out activating treatment by vapor and roasting, dissolving Pt-containing reagent in a hydrochloric acid solution, and slowly and dropwisely adding the kieselguhr subjected to activating treatment; and standing the impregnant at room temperature over night, drying, cooling to room temperature, dropwisely adding a nickel-containing solution onto the kieselguhr, aging, drying, and reducing with hydrogen to obtain the composite catalyst. The kieselguhr subjected to acid washing is used as a supporter to support Pt and Ni so as to prepare the composite catalyst; and thus, the invention solves the problems of high catalyst carbon deposition amount, short service life and low catalytic activity in the isomerization process of extracting 2,6-dimethylnaphthalene from coal tar, increases the isomerization conversion rate and enhances the recovery rate of 2,6-dimethylnaphthalene extracted from coal tar.

Description

technical field [0001] The invention relates to a catalyst method for extracting 2,6-dimethylnaphthalene from coal tar, belonging to the field of chemical catalysis. Background technique [0002] 2,6-Dimethylnaphthalene (2,6-DMN) is an important raw material for the synthesis of naphthalene polymers, and the oxidized 2,6-naphthalene dicarboxylic acid is polymerized with ethylene glycol to obtain polyethylene naphthalate Ester (PEN) is a new type of polyester material, its strength, heat resistance, and flame retardancy are higher than PET, and it has shown superior comprehensive performance compared to PET in packaging, electronic components, film, etc. A new type of functional polymer material. With the expansion of the application range of PEN, the demand for 2,6-DMN will gradually increase. [0003] The preparation of 2,6-DMN usually has a synthesis method and a direct extraction method using coal tar as a raw material. The synthesis method uses toluene, n-butene, carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C07C15/24C07C7/148
Inventor 韩钊武
Owner 韩钊武
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