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Method for directly preparing p-xylene from synthesis gas and methylbenzene

A technology for para-xylene and synthesis gas, which is used in chemical instruments and methods, condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, catalyst activation/preparation, etc.

Active Publication Date: 2019-05-21
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

Due to thermodynamic limitations, the proportion of p-xylene in the three xylenes is less than 25%, which requires a large amount of material recycling, high energy consumption, and high investment

Method used

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  • Method for directly preparing p-xylene from synthesis gas and methylbenzene
  • Method for directly preparing p-xylene from synthesis gas and methylbenzene
  • Method for directly preparing p-xylene from synthesis gas and methylbenzene

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Prepared with 0.05mol / L Zn 2+ With 1.0mol / L Al 3+ 1 L of mixed nitrate aqueous solution, and slowly add 0.5 mol / L ammonia solution to it, while controlling the coprecipitation reaction temperature to be 70°C and controlling the pH value to be 7.2, so as to co-precipitate metal ions. After the reaction, the reaction mixture was aged at 70° C. for 4 h. The precipitate was filtered, washed with deionized water, dried, and calcined at 500°C for 4 hours to obtain a highly dispersed zinc oxide material with alumina as an inert carrier, coded as A. A contains 8.3% by weight of zinc, and the XRD pattern is as follows figure 1 shown.

Embodiment 2

[0093] Prepared with 0.02mol / L Zn 2+ , 0.02mol / L Cr 3+ With 1.0mol / L Al 3+ Add 1 L of mixed nitrate aqueous solution, and slowly add 1.0 mol / L ammonium carbonate solution to it, while controlling the co-precipitation reaction temperature to 70°C and controlling the pH value to 7.5, so as to co-precipitate metal ions. After the reaction, the reaction mixture was aged at 70° C. for 4 h. The precipitate was filtered, washed with deionized water, dried, and calcined at 500°C for 4 hours to obtain a highly dispersed zinc-chromium oxide material with alumina as an inert carrier, coded as B. B contains 3.1% by weight of zinc and 2.5% by weight of chromium.

Embodiment 3

[0095] Prepared with 0.01mol / L Zn 2+ , 0.01mol / L Zr 4+ With 1.0mol / L Al 3+ Add 1 L of mixed nitrate aqueous solution, and slowly add 1.2 mol / L sodium carbonate solution into it, while controlling the co-precipitation reaction temperature to 70°C and controlling the pH value to 7.3, so as to co-precipitate metal ions. After the reaction, the reaction mixture was aged at 70° C. for 4 h. The precipitate was filtered, washed with deionized water, dried, and calcined at 500°C for 4 hours to obtain a highly dispersed zinc-zirconium oxide material with alumina as an inert carrier, coded as C. C contains 1.5% by mass of zinc and 2.1% by mass of zirconium.

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Abstract

The invention discloses a method for directly preparing p-xylene from synthesis gas and methylbenzene. The method comprises the following steps: enabling raw materials comprising the synthesis gas andmethylbenzene to be in contact with a catalyst in a reaction zone under a reaction condition that at least a part of raw materials is sufficiently converted, so as to obtain a reaction effluent containing p-xylene; and separating p-xylene from the reaction effluent, wherein the catalyst comprises a high dispersion metallic oxide material with the range limited by an inert carrier, an acid molecular sieve and at least one of graphite powder and a dispersing agent; in the high dispersion metallic oxide material with the range limited by the inert carrier, the inert carrier comprises at least one of silicon oxide and aluminum oxide; the metal content of metallic oxide is less than or equal to 10% by mass; and the high dispersion metallic oxide material with the range limited by the inert carrier is counted by weight, and the acid molecular sieve is selected from a modified acid ZSM-5 molecular sieve, a modified acid ZSM-11 molecular sieve and a mixture of the modified acid ZSM-5 molecular sieve and the modified acid ZSM-11 molecular sieve.

Description

technical field [0001] The invention relates to a method for directly producing p-xylene from synthesis gas and toluene. Background technique [0002] Paraxylene (PX) is an important basic chemical raw material, mainly used to prepare terephthalic acid (PTA), and then produce polyethylene terephthalate (PET). At present, p-xylene is mainly obtained from aromatics complexes, in which high-purity PX products are obtained from naphtha through reforming, aromatics extraction, aromatics fractionation, disproportionation and transalkylation, xylene isomerization and adsorption separation. Due to thermodynamic limitations, the proportion of p-xylene in the three xylenes is less than 25%, and the amount of material circulation is large, the energy consumption is high, and the investment is high. Using methanol to p-toluene to produce p-xylene can break through the thermodynamic limit and obtain a high proportion of p-xylene, which is a promising route for PX production. [0003] A...

Claims

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Application Information

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IPC IPC(8): C07C2/86C07C15/08B01J29/40B01J29/46B01J29/48B01J37/02B01J37/03B01J37/30
CPCB01J29/40B01J29/44B01J29/46B01J29/48B01J37/02B01J37/03B01J37/30C07C2/86C07C15/08Y02P20/52
Inventor 倪友明朱文良刘中民刘勇陈之旸刘红超马现刚刘世平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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