Method of directly preparing paraxylene from synthetic gas and aromatic hydrocarbon

A technology of p-xylene and synthesis gas, which is applied in the direction of chemical instruments and methods, condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, hydrocarbons, etc., and can solve the problems of large material circulation, high energy consumption, and high investment

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 of directly preparing paraxylene from synthetic gas and aromatic hydrocarbon
  • Method of directly preparing paraxylene from synthetic gas and aromatic hydrocarbon
  • Method of directly preparing paraxylene from synthetic gas and aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] 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

[0096] 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

[0098] Prepared with 0.01mol / L Zn 2+ , 0.01mol / L Zr 4+ with 1.0mol / L A1 3+ 1L of mixed nitrate aqueous solution, 1.2 mol / L sodium carbonate solution was slowly added therein, while controlling the co-precipitation reaction temperature to be 70°C and the pH value to be 73, 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 of directly preparing paraxylene from synthetic gas and aromatic hydrocarbon. The method comprises the steps of allowing a raw material containing the synthetic gas and aromatic hydrocarbon except paraxylene to be contacted with a catalyst in a reaction area under a reaction condition sufficient to convert at least part of the raw material to form a reaction effluent containing paraxylene, and separating paraxylene from the reaction effluent, wherein the catalyst comprises an inert carrier confinement high dispersion metal oxide material, an acidic molecular sieve, and at least one of optional graphite powder and a dispersing agent; in the inert carrier confinement high dispersion metal oxide material, an inert carrier is at least one of silicon oxide and aluminum oxide; a content of metal oxide calculated as per a metal is less than or equal to 10wt% based on the weight of the inert carrier confinement high dispersion metal oxide material; and the acidic molecular sieve is selected from a modified acidic ZSM-5 molecular sieve, a modified acidic ZSM-11 molecular sieve and a mixture of the modified acidic ZSM-5 molecular sieve and the modified acidicZSM-11 molecular sieve.

Description

technical field [0001] The invention relates to a method for directly producing p-xylene from synthesis gas and aromatic hydrocarbons. 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 productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/86C07C4/00C07C5/22C07C15/08B01J29/40B01J29/48B01J29/46B01J35/10
CPCB01J21/18B01J29/40B01J29/405B01J29/46B01J29/48B01J35/023B01J35/026B01J35/10B01J37/0009B01J37/0236B01J37/031B01J37/036B01J37/04B01J37/06B01J37/088C07C1/04C07C2/86C07C2/862C07C4/00C07C5/22C07C15/08C07C2529/40C07C2529/46Y02P20/52C07C11/04
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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