US 12,534,423 B2 · Method for preparing p-xylene

Abstract

A method for preparing p-xylene is provided. Raw materials containing methanol, naphtha and CO2 are introduced into a reactor filled with a catalyst for a reaction to produce p-xylene. By adding the methanol, the product distribution is adjusted, and the selectivity of p-xylene is obviously improved. In addition, components containing benzene and toluene in aromatic hydrocarbon products are returned to a reaction system and co-fed with the raw materials for a reaction to produce p-xylene, so that cyclic utilization of the raw materials is achieved, and the method has extremely high economic benefits. The method has a simple process and high feasibility, can greatly improve the selectivity and yield of p-xylene, has an important application value, and provides a new way for large-scale utilization of CO2.

Claims19

Dependent claims

A method for preparing p-xylene, comprising introducing raw materials containing methanol, naphtha, and CO2 into a reactor filled with a catalyst for a reaction to produce the p-xylene;

wherein conditions for the reaction are as follows:
a reaction temperature is in a range from 450° C. to 650° C., a reaction pressure is in a range from 0.1 MPa to 3.5 MPa, a weight hourly space velocity of the naphtha is in a range from 0.1 h−1 to 5 h−1, a weight hourly space velocity of the CO2 is in a range from 0.1 h−1 to 3 h−1, and a weight hourly space velocity of the methanol is in a range from 0.1 h−1 to 5 h−1;
wherein an mass amount ratio of the CO2, the naphtha, and the methanol is (0.3-2):1:(0.3-2);
and
wherein the acidic molecular sieve is an HZSM-5 zeolite molecular sieve.

2 more elements

Dependencies are inferred from the claim text.

Method for preparing p-xylene

Life of this patent

Method for preparing p-xylene

Life of this patent

Abstract

Claims19