Catalyst used in process of preparing dimethyl ether from methanol on fluidized bed and preparation method thereof

Abstract

The invention discloses a catalyst used in the process of preparing dimethyl ether from methanol on a fluidized bed, which is prepared by a method comprising the following steps of: uniformly mixing desalted water and a silicon-containing material, adding an aluminum-containing material and silicon aluminum phosphorus molecular sieves, uniformly mixing, adding a base material, uniformly mixing toobtain slurry, adjusting a pH value to ensure that the slurry forms a gel state, continuously stirring, pelleting by spraying so as to obtain solid microspheres, roasting, acid-washing, drying and roasting to obtain the catalyst which has the abrasion index of 0.5 to 2.0 and is used in the process of preparing the dimethyl ether from the methanol on the fluidized bed. The hollow degree of the solid microspheres can be lowered by the catalyst prepared by the method, while the catalytic activity is met, the wear-resisting property of the catalyst is obviously improved, and the abrasion index ofthe catalyst is below 2.0 and can be below 1.5 by optimizing preparation parameters; and the catalyst has high stability and long service life and is characterized by low reaction temperature, high methanol conversion ratio, high selectivity of the dimethyl ether and low cost, and the large-scale production of the dimethyl ether can be realized by the catalyst.

Description

technical field [0001] The invention belongs to the field of catalyst preparation. The invention relates to a catalyst for producing dimethyl ether from methanol and a preparation method thereof. Background technique [0002] Dimethyl ether is a colorless gas with an ether smell under normal pressure. As a new basic chemical raw material, due to its good characteristics of easy compression, condensation and vaporization, dimethyl ether is widely used in pharmaceuticals, fuels, pesticides, etc. There are many unique uses in the chemical industry. For example, high-purity dimethyl ether can replace freon as an aerosol propellant and refrigerant, reducing pollution to the atmospheric environment and damage to the ozone layer. Due to its good water solubility and oil solubility, its application range is much better than that of propane, butane and other petrochemicals. Replacing methanol as a new raw material for formaldehyde production can significantly reduce the cost of fo...

AI Technical Summary

Problems solved by technology

However, the patent application has not been optimized for the various molecular sieves mentioned. Because the acidity of different molecular sieves is very different, when used in the process of methanol to dimethyl ether, the conversion rate and selectivity of the reaction are very different.