Toluene and methanol and/or dimethyl ether alkylation reaction catalyst and preparation method thereof

A technology of dimethyl ether alkanes and catalysts, which is applied in the field of catalysts for the alkylation reaction of toluene and methanol or/and dimethyl ether and its preparation, can solve the problems of weak acid center strength and reduced toluene conversion rate, and reduce light The generation of hydrocarbons, the improvement of toluene conversion rate, and the effect of inhibiting the disproportionation reaction of toluene

Active Publication Date: 2016-07-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • 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

Method used

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  • Toluene and methanol and/or dimethyl ether alkylation reaction catalyst and preparation method thereof
  • Toluene and methanol and/or dimethyl ether alkylation reaction catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] Catalyst preparation

[0040] (1) Put 200gHZSM-5 zeolite molecular sieve (SiO 2 / Al 2 O 3 =100) (Nankai University Catalyst Factory) was added to 300g of 8% phosphoric acid aqueous solution, and immersed 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.

[0041] (2) Add the phosphorus-impregnated sample in step (1) to 300 g of a lanthanum nitrate aqueous solution with a concentration of 8 wt%, and immerse for about 6 hours at room temperature. 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 calcined sample in step (2) to 150°C and then move it into a desiccator to continue cooling to room temperature. Move the sample after it has dropped to room temperature into a desiccator with deionized water at the bottom...

Example Embodiment

[0045] Example 2

[0046] Catalyst preparation

[0047] (3) The 200gHZSM-5 zeolite molecular sieve (SiO 2 / Al 2 O 3 =150) (Nankai University Catalyst Factory) was added to 300g phosphoric acid aqueous solution with a concentration of 5%, and immersed 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 8 hours.

[0048] (4) Add the phosphorus-impregnated sample in step (1) to 300 g of lanthanum nitrate aqueous solution with a concentration of 5 wt%, and immerse for about 6 hours at room temperature. 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 calcined sample in step (2) to 150°C and then move it into a desiccator to continue cooling to room temperature. Move the sample after it has dropped to room temperature into a desiccator with deionized ...

Example Embodiment

[0052] Example 3

[0053] Response evaluation

[0054] The catalysts HCTM-01 and HCTM-02 prepared in Examples 1 and 2 were compressed into tablets and crushed and sieved into 40-60 mesh. Put 10g of the catalyst into the reactor respectively, treat in a nitrogen atmosphere at 550°C for 1 hour, and then lower the temperature to the reaction temperature of 480°C. Toluene and methanol are pumped into the reactor through the feed pump to react with the catalyst. The mass space velocity of the toluene feed is 2h -1 , The feed molecular ratio of toluene to methanol is 2 / 1, and the reaction products are analyzed by gas chromatography on-line. The composition of non-aqueous products is shown in Table 1.

[0055] Table 1

[0056] Catalyst

[0057] *wt%, product quality distribution.

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Abstract

The invention provides a toluene and methanol and/or dimethyl ether alkylation reaction catalyst and a preparation method thereof. The outer surface acid site of the catalyst is passivated through modification, and the inner surface acid site of the catalyst is retained. The preparation method of the catalyst comprises the following steps: a hydrogen-type molecular sieve with an MFI topological structure is subjected to element modification, such that the acid site is modified; the sample is dried and roasted, and is subjected to pre-absorption in saturated water vapor; the sample is then subjected to absorption in saturated ethanol vapor; the sample is impregnated in a siloxane-based agent, such that the siloxane-based agent is only absorbed on the outer surface of the molecular sieve; and drying and roasting are carried out, such that a high-activity selective catalyst is obtained. When the catalyst is applied in a toluene and methanol and/or dimethyl ether alkylation reaction, toluene conversion ate can be effectively improved, and the generation of light hydrocarbon components can be reduced.

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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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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