Process for the preparation of borosilicate zeolites

Claim 1

A process for the preparation of crystalline ZBH borosilicate zeolites of the pentasil type which comprises: adding silicon dioxide, boric acid and an alkali metal salt to a liquid ether or ether-water solvent wherein the ether is selected from the group consisting of monoethylene, diethylene, triethylene and tetraethylene glycol dimethyl ether, diethyl ether, a mixture of triethylene to decaethylene glycol methyl isopropyl ethers, diethylene glycol methyl isopropyl ether, a mixture of polyethylene glycol methyl isopropyl ethers, a mixture of oxyethylated oxoalcohols having a mean molecular weight of 200, 600 or 6,000, and dimethoxymethane, the molar ratio of SiO 2 to B 2 O 3 being from 3 to 300, the molar ratio of alkali metal salt to B 2 O 3 being from 1 to 3 and the molar ratio of ether to B 2 O 3 being from 18 to 390, and thereafter heating the resultant solution to a temperature of from 80° to 140° C. in a closed vessel under autogenous pressure to form said ZBH borosilicate zeolites, wherein the zeolites have the formula M.sub.2/n O:B.sub.2 O.sub.3 :x SiO.sub.2 :y H.sub.2 O where N is one or more cations of valency n, x is ≧10 and y is from 0 to 80.