Catalyst for preparing dimethyl ether by dehydration of methanol and preparation method thereof

Abstract

The invention discloses a catalyst for preparing dimethyl ether by dehydration of methanol and a preparation method thereof. The catalyst consists of 30-80% (weight at butt) of molecular sieve and 70-20% (weight at butt) of caking agent, wherein, the molecular sieve is nano-ZSM-23 molecular sieve, and the caking agent is at least one of silicon dioxide and aluminium phosphate. The preparation method comprises the steps: the nano-ZSM-23 molecular sieve, the caking agent and the water are mixed and kneaded for molding, and then the catalyst is prepared by drying and calcination. The catalyst has the advantages of high activity and selectivity, good stability, wide reaction temperature range, short production flow and low cost; and the catalyst is also beneficial to industrial production and application.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical synthesis, in particular to a catalyst for preparing dimethyl ether by dehydrating methanol and a preparation method thereof. Background technique [0002] Dimethyl ether (DME) is a class of ether chemical products. It is a colorless, non-toxic and environmentally friendly gas at normal temperature and pressure. It is widely used in industrial fields such as refrigeration, pharmaceuticals, dyes and pesticides. At the same time, dimethyl ether itself contains oxygen, has a short carbon chain, good combustion performance, high thermal efficiency, and its emission is lower than that of methanol and second only to hydrogen. It has great potential as a fuel to replace liquefied petroleum gas (LPG) and diesel, and is called the fuel of the 21st century. "Ultra Clean Energy". [0003] Under the catalysis of solid acid, the preparation of dimethyl ether by methanol dehydration is a common meth...

AI Technical Summary

Problems solved by technology

[0005] It is known from the prior art that the catalyst for the dehydration of methanol with molecular sieve as the active component to prepare dimethyl ether does not emphasize the role of molecular sieve pore structure, such as FAU structure zeolite and Beta zeolite with three-dimensional macroporous structure, etc., which have three-dimensional mesopore structure ZSM-5 and SAPO-34 with a three-dimensional small pore structure, etc., to generate dimethyl ether with high selectivity, the general technology adopted is to adjust the acidity of molecular sieves, or to combine different molecular sieves, or to modify molecular sieves