Method for dehydrating and isomerising alcohols using a non-zeolite aluminosilicate solid
AssigneeIfp Energies Nouvelles
InventorsAlexandra Chaumonnot, Vincent Coupard, Sylvie Maury
Life of this patent
Estimating the term…
Abstract
Process for simultaneous dehydration and skeletal isomerization of a feedstock that comprises at least one C4 monoalcohol and that contains between 0.5 and 50% water, for the purpose of producing C4 alkenes, with said process operating at a temperature of between 250 and 550° C., under a pressure of between 0.1 and 1 MPa, with an hourly volumetric flow rate of between 0.1 and 10 h−1, characterized in that it uses a catalyst that comprises at least one non-zeolitic aluminosilicate-type solid.
Claims17
A process for simultaneous dehydration and skeletal isomerization of a feedstock comprising at least one C4 monoalcohol and between 0.5% by weight and 50% by weight of water to produce C4 alkenes, the process comprising contacting the feedstock with a catalyst at a temperature of between 250° C. and 550° C., under a pressure of between 0.1 MPa and 1 MPa, and with an hourly volumetric flow rate of between 0.1 h−1 and 10 h−1,
- wherein the catalyst comprises at least one non-zeolitic aluminosilicate solid with a silica content of between 4% by weight and 95% by weight of said non-zeolitic aluminosilicate solid, said non-zeolitic aluminosilicate solid having the following further characteristics:
- a total pore volume, measured by mercury intrusion porosimetry, of between 0.1 ml/g and 0.7 ml/g,
- a total pore volume, measured by nitrogen adsorption isotherm, of between 0.1 ml/g and 0.7 ml/g,
- a BET specific surface area of between 100 m2/g and 550 m2/g,
- a pore volume, measured by mercury intrusion porosimetry, in pores with a diameter of greater than 140 Å, of less than 0.1 ml/g,
- a pore volume, measured by mercury intrusion porosimetry, in pores with a diameter of greater than 500 Å, of less than 0.01 ml/g, and
- a mean pore diameter of between 20 Å and 140 Å,
- and wherein said non-zeolitic aluminosilicate solid is prepared according to a process comprising the following stages:
- stage a) forming a reaction mixture by mixing at least one aluminum compound that is partially soluble in an acid medium with either (i) at least one silicic compound that is totally soluble in the reaction mixture or (ii) a combination comprising the at least one silicic compound and the at least one aluminum compound, and obtaining a precursor solid,
- stage b) shaping said precursor solid, and
- stage c) subjecting said precursor solid to heat treatment and/or hydrothermal treatment with said stage c) being carried out before or after said stage b).
Dependencies are inferred from the claim text.