Catalyst for alkylation reaction of toluene and methanol or/and dimethyl ether and preparation method thereof

A technology of dimethyl ether alkane and catalyst, which is applied in the field of toluene and methanol or/and dimethyl ether alkylation reaction catalyst and its preparation field, can solve the problems of reduced toluene conversion rate, weakened acid center strength and the like, and achieves the improvement of toluene Conversion rate, reduction of light hydrocarbon generation, effect of suppressing toluene disproportionation reaction

Active Publication Date: 2018-07-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although high-selectivity p-xylene products can be obtained from the above-mentioned alkylation reaction products of toluene and methanol, the modification process of the catalyst greatly weakens the strength of the acid centers on the inner and outer surfaces of the catalyst, thus reducing the conversion rate of the raw material toluene

Method used

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  • Catalyst for alkylation reaction of toluene and methanol or/and dimethyl ether and preparation method thereof
  • Catalyst for alkylation reaction of toluene and methanol or/and dimethyl ether and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Catalyst preparation

[0040] (1) 200g HZSM-5 zeolite molecular sieve (SiO 2 / Al 2 o 3 =100) (Nankai University Catalyst Factory) was added into 300 g concentration of 8% phosphoric acid aqueous solution, soaked at normal temperature for about 6 hours. Then the solid sample was centrifuged, dried in an air atmosphere at 120°C for 12 hours, and calcined in an air atmosphere at 550°C for 4 hours.

[0041] (2) Add the impregnated phosphorus sample in step (1) into 300 g of lanthanum nitrate aqueous solution with a concentration of 8 wt%, and immerse at room temperature for about 6 hours. Then the solid sample was centrifuged, dried in an air atmosphere at 120°C for 12 hours, and calcined in an air atmosphere at 550°C for 4 hours.

[0042] (3) Cool the roasted sample in step (2) to 150° C. and then move it into a desiccator to continue cooling to room temperature. Move the sample down to room temperature into a desiccator filled with deionized water at the bottom, and th...

Embodiment 2

[0046] Catalyst preparation

[0047] (3) 200g HZSM-5 zeolite molecular sieve (SiO 2 / Al 2 o 3 =150) (Nankai University Catalyst Factory) was added into 300 g concentration of 5% phosphoric acid aqueous solution, soaked at normal temperature for about 6 hours. Then the solid sample was centrifuged, dried in an air atmosphere at 120°C for 24 hours, and calcined in an air atmosphere at 550°C for 8 hours.

[0048] (4) Add the impregnated phosphorus sample in step (1) into 300 g of 5 wt % lanthanum nitrate aqueous solution, and immerse at room temperature for about 6 hours. Then the solid sample was centrifuged, dried in an air atmosphere at 120°C for 24 hours, and calcined in an air atmosphere at 550°C for 6 hours.

[0049] (6) Cool the roasted sample in step (2) to 150° C. and then move it into a desiccator to continue cooling to room temperature. Move the sample down to room temperature into a desiccator filled with deionized water at the bottom, and then put the desiccator...

Embodiment 3

[0053] Response evaluation

[0054] The catalysts HCTM-01 and HCTM-02 prepared in Examples 1 and 2 were pressed into tablets, crushed and sieved to 40-60 meshes. 10 g of catalysts were loaded into the reactor respectively, treated in a nitrogen atmosphere at 550°C for 1 hour, and then cooled to a reaction temperature of 480°C. Pump toluene and methanol into the reactor through the feed pump to contact with the catalyst for reaction, the mass space velocity of toluene feed is 2h -1 , the feed molecular ratio of toluene to methanol was 2 / 1, and the reaction products were analyzed online by gas chromatography, and the composition of non-aqueous products was shown in Table 1.

[0055] Table 1

[0056] catalyst

[0057] *wt%, product mass distribution.

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Abstract

The invention provides a catalyst for the alkylation reaction of toluene and methanol or / and dimethyl ether and a preparation method thereof. The acid center on the outer surface of the catalyst is modified and passivated, and the acid center on the inner surface is retained; the preparation method of the catalyst includes the following steps: firstly modifying the acid center of the hydrogen-type molecular sieve with MFI topology, and then drying 1. After roasting, the sample is pre-adsorbed in saturated water vapor, then moved into saturated ethanol vapor for adsorption, and finally moved into the siloxane-based reagent for immersion, so that the siloxane-based reagent is only adsorbed on the outer surface of the molecular sieve, after drying and roasting After that, a highly active shape-selective catalyst is obtained. The catalyst is used for the alkylation reaction of toluene with methanol or / and dimethyl ether, can effectively increase the conversion rate of toluene, and can reduce the formation of light hydrocarbon components.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and particularly provides a catalyst for the alkylation reaction of toluene and methanol or / and dimethyl ether and a preparation method thereof. Background technique [0002] Paraxylene (PX) is an important basic chemical raw material. At present, p-xylene is mainly obtained through aromatics complex. Because the content of p-xylene in the three isomers is controlled by thermodynamics, p-xylene only accounts for about 23% in the xylene isomers, especially the difference between the boiling points of the three isomers of xylene is very small, and the usual Distillation technology cannot obtain high-purity p-xylene, but an expensive adsorption separation process must be used. Therefore, in the entire PX production process, the amount of material circulation is large, the equipment is huge, and the operating cost is high. P-xylene is mainly used to produce polyester. With the rap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C15/08C07C2/86
CPCY02P20/52
Inventor 许磊王莹利张洁黄治华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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