US 2009/0023958 A1 · Process for preparing dimethyl ether from crude methanol in an adiabatic reactor

Abstract

The present invention relates a process for preparing dimethyl ether from crude methanol in an adiabatic reactor(s)/and more particularly to a process for preparing dimethyl ether wherein crude methanol containing water is dehydrated by using (1) a catalytic system in which the reactant contacts a catalyst 1 of hydrophobic zeolite partially substituted by a specific metal cation and subsequently a catalyst 2 selected from γ-alumina or silica-alumina; and (2) an adiabatic reactor(s). In the present invention, the dehydration is accomplished effectively by avoiding the formation or byproducts and the deactivation of catalyst. Therefore, dimethyl ether useful as clean fuel and a raw material in chemical industry can be produced from crude methanol with an enhanced yield in an adiabatic reactor(s).

Claims9

Dependent claims

A process for preparing dimethyl ether by dehydrating crude methanol in (an) adiabatic reactor(s), wherein said dehydration is performed over a catalytic system which consists of a catalyst 1 of Formula 1 partially substituted by metal cations for protons (H+) of hydrophobic zeolite;

and a catalyst 2 selected from γ-alumina and silica-alumina, wherein methanol contacts with the catalyst 1 and the catalyst 2 sequentially,
HKM(1−x)/nZ (1)
wherein H is a proton;
M is at least one cation selected from metal cations belonging to IA group, IIA group, IB group or IIB group in Periodic Table;
n is the oxidation number of substituted cations (M);
x is a proton content in the range of 10-90 mol %;
and Z is a hydrophobic zeolite wherein SiO2/Al2O3 ratio is in the range of 20-200 of SiO2/Al2O3.

4 more elements

Dependencies are inferred from the claim text.

Process for preparing dimethyl ether from crude methanol in an adiabatic reactor

Life of this patent

Process for preparing dimethyl ether from crude methanol in an adiabatic reactor

Life of this patent

Abstract

Claims9