Catalyst for converting alcohols and ethers into aromatic hydrocarbons as well as preparation method and use method thereof

Abstract

The invention discloses a catalyst for converting alcohols and ethers into aromatic hydrocarbons, as well as a preparation method and a use method of the catalyst, and belongs to the technical field of chemical engineering. The preparation method comprises the steps as follows: at first, taking a template agent, kaolin, sodium hydroxide and water as raw materials for preparing a hydrogen type nanoscale ZSM-5 molecular sieve, and then directly preparing the catalyst; or based on the hydrogen type nanoscale ZSM-5 molecular sieve, preparing the two-component, three-component or four-component catalyst with metal and / or a structure enhancer and / or a stabilizing additive. The catalyst comprises the following components in percentage by mass: 30-100% of the needle-like nanoscale ZSM-5 molecular sieve, 0-10% of the metal, 0-50% of the structure enhancer and 0-10% of the stabilizing additive. The invention further provides a method for enabling the catalyst to be used for converting alcohols and ethers into aromatic hydrocarbons. The catalyst is small in particle size, high in catalytic efficiency and low in use cost; the preparation method is simple and efficient; and the use method is reasonable and efficient.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a catalyst for converting alcohols and ethers into aromatic hydrocarbons and its preparation and use methods. Background technique [0002] Aromatics are one of the most important basic chemicals. In the traditional chemical route, aromatics are mainly obtained from petroleum refining and coal dry distillation. The aromatic hydrocarbons obtained by the petroleum route have high purity and are suitable for the preparation of various high-quality chemicals. The aromatics obtained by the coal (carbonization) route contain thiophene impurities, the quality is relatively low, and the application is limited. With the increasing shortage of petroleum resources, the supply of aromatics is tense, and the price remains high, which greatly increases the production of subsequent chemicals. costs, affecting sales. The use of natural gas (mainly composed of methane) or petroleum re...

AI Technical Summary

Problems solved by technology

The activity of this type of catalyst decreases to less than 90% of the maximum activity within 1 hour, so frequent reaction regeneration is required

Catalyst transport at different temperatures and in different reactors can lead to a decrease in its strength and an increase in attrition rate

If a large amount of structural enhancer is used, the overall strength of the catalyst will be improved, but the ratio of active ingredients (such as molecular sieves and metals) in the catalyst will decrease, the space velocity of the catalyst will decrease, the amount of use will be greatly increased, and the cost will also increase

Although it has been reported to use ZSM-5 molecular sieves into nanoparticles (approximately spherical) for methanol to propylene and other processes, there is no report on the direct production of aromatics from methanol

At the same time, ZSM-5 molecular sieve nanoparticles that are too small are difficult to filter, have a large loss rate, and have high preparation costs