Preparation method of C10<+> heavyweight aromatic hydrocarbon transalkylation catalyst

Abstract

The invention discloses a preparation method of a C10<+> heavyweight aromatic hydrocarbon transalkylation catalyst. The preparation method is characterized in that firstly, the catalyst is prepared from a main active component named a HY molecular sieve with the mass percentage of 50-80% and the grain size of 30-100 nanometers, an adhesion agent named aluminum oxide of 15-40% and a modifying agent component named metal or a metallic oxide of 1-8%; secondly, the catalyst is prepared by the following steps: 1) mixing the nano HY molecular sieve with aluminum oxide, adding a squeeze aid, a pore-enlarging agent or an intensity additive with the mass percentage of no more than 5%, carrying out extrusion molding with a dilute nitric acid solution with mass percentage concentration of 4%, airing naturally, drying at 100-120 DEG C for 10-15 hours, then carrying out temperature programming to 550 DEG C, and roasting for 4-6 hours, thereby preparing a semi-finished catalyst; and 2) adding the product in the step 1) into a metal salt solution of the modifying agent component, dipping at room temperature with the equal volume for 6-30 hours, drying at 100-120 DEG C for 10-15 hours, then carrying out temperature programming to 550 DEG C, and roasting for 4-6 hours, thereby obtaining the finished product of the catalyst.

Description

technical field [0001] The present invention relates to a C 10 + Process for the preparation of heavy aromatic hydrocarbon transalkylation catalysts, especially with regard to C 10 A or / and C 11 + A preparation method of a catalyst for preparing light aromatics such as benzene, toluene and xylene through transalkylation of heavy aromatics (A is referred to as aromatics, the same below). Background technique [0002] Heavy aromatics are a valuable petrochemical resource, mainly derived from the by-products of light oil cracking to produce ethylene units, the extracted aromatics from catalytic reforming in refineries, and the by-products of toluene disproportionation and transalkylation units. In recent years, with the continuous improvement of my country's oil refining capacity and the successive commissioning of continuous reforming units in large petrochemical enterprises, the output of heavy aromatics has increased significantly. At the same time, with the development...

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Problems solved by technology

[0010] Chinese patent CN102746093A uses hydrogen-type binderless ten-membered ring zeolite loaded with platinum or palladium as a catalyst, the reaction temperature is 320-450°C, the reaction pressure is 2-4MPa, and the weight hourly space velocity of hydrocarbon raw materials is 1-4h -1 , under the reaction conditions of 3-10:1 molar ratio of hydrogen hydrocarbon raw materials, heavy aromatics are subjected to hydrocracking reaction, and the BTX content in the product is above 57%, C 9 About 20% aromatics, but at least 11-15% low-carbon non-aromatics, with large loss of alkyl groups

[0012] The above method works for C 10 + The activity of heavy aromatics is not high, mainly used to deal with C 9 + Aromatic hydrocarbons (mainly including C 9 and part C 10 Aromatics), and the loss of alkyl groups is large, and a large amount of low-carbon non-aromatics are generated, which is a major defect of the current heavy aromatics lightening technology

[0013] The purpose of the present invention is to overcome the disadvantages of poor flexibility in the conversion of aromatic hydrocarbons in the prior art, and generally the shortcomings of the need to consume a large amount of hydrogen in the reaction to hydrogen and the shortcoming of catalyst deactivation and short life, and provide a C 10 + Non-hydrogenated transalkylation catalyst for heavy aromatics