Process for obtaining heterogeneous acid catalysts based on mixed metal salts and use thereof

Heterogeneous acid catalysts comprising mixed metal salts of lithium and aluminum phosphates and/or sulfates and an optional metal cation with the following metal weight percentages of the catalyst:

• lithium up to 5 weight % and aluminum up to 15 weight %;
• in combinations with metal cations in amounts of up to 40 weight % of the catalyst, where said cations are selected from the group consisting of magnesium, titanium, zinc, zirconium, gallium and silicon;
• organic or inorganic porosity promoters in concentrations of 0.05 to 25 weight % on wet base catalyst, where said organic porosity promoters are polysaccharides;
• binders in concentrations of 1 to 20 weight % of the catalyst, said binders selected from the group consisting of clays, kaolin and metal oxides having the formula MxOy,
• where M=Al, Mg, Sr, Zr or Ti, X=1 or 2 and y=2 or 3, for the formation of particles of shape and size, in the form of extrudates, spheres, trilobules and raschig rings;
• the catalyst having a surface area of 10 to 180 m2/g, pore volume of 0.1 to 0.5 cm3/g, and average pore diameter 100 to 200 Å.