Patent ID: 7211606

Claim:
A process for the preparation of dimethylether from hydrocarbons, comprising the following steps of: (a) simultaneously subjecting a feedstock mixture including C1–C4 hydrocarbons, carbon dioxide, and water vapor, and an oxidant, to CO 2 dry reforming and steam reforming, in the presence of a tri-reforming catalyst, to obtain a reaction product gas mixture comprising hydrogen, carbon monoxide, unreacted material, and by-products; (b) separating and recovering the unreacted material and by-products including carbon dioxide from the reaction product gas mixture obtained in step (a), to obtain a syngas including hydrogen and carbon monoxide; (c) simultaneously subjecting the syngas to methanol synthesis and methanol dehydration in the presence of a hybrid catalyst, to obtain a reaction product gas mixture including dimethylether, unreacted material and by-products; and (d) separating and recovering the unreacted material and by-products including carbon dioxide from the reaction product gas mixture obtained in step (c), to obtain dimethylether, wherein said tri-reforming catalyst comprises Ni/Ce/ZrO 2 /MgO/Cr/γ-Al 2 O 3 , and said hybrid catalyst comprises a methanol synthesis catalyst including Cu/Zn/Zr/Al/Mn/Ga, a methanol dehydration catalyst including γ-Al 2 O 3 , and a binding material having an average particle size of 10–100 nm, which are physically combined together.