초록 ▼

A process for obtaining a tertiary olefin, e.g. isobutylene in a very pure state by decomposing the corresponding ether, e.g. methyl tert. butyl ether, in the presence of a catalyst constituted by silica, modified by the addition of at least one element or compound of an element preferably chosen fr

A process for obtaining a tertiary olefin, e.g. isobutylene in a very pure state by decomposing the corresponding ether, e.g. methyl tert. butyl ether, in the presence of a catalyst constituted by silica, modified by the addition of at least one element or compound of an element preferably chosen from the group constituted by rubidium, cesium, magnesium, calcium, strontium, barium, gallium, lanthanum, cerium, praseodymium, neodymium and uranium and optionally by the addition of at least one element or compound of an element chosen from the group constituted by aluminium, titanium and zirconium.

대표청구항 ▼

A process for obtaining at least one tertiary olefin of formula [Figure] by decomposition of the corresponding ether of formula [Figure] in which R and R1, which can be the same or different, are each chosen from within the group formed by hydrogen, the alkyl, arylalkyl, aryl and alkylaryl radicals,

A process for obtaining at least one tertiary olefin of formula [Figure] by decomposition of the corresponding ether of formula [Figure] in which R and R1, which can be the same or different, are each chosen from within the group formed by hydrogen, the alkyl, arylalkyl, aryl and alkylaryl radicals, and R2 and R3, which can be the same or different, are each chosen from within the group formed by the alkyl, arylalkyl, aryl and alkylaryl radicals, in the presence of a catalyst consisting essentially of silica modified by an additive consisting essentially of at least one element or compound of an element chosen from within the group consisting of rubidium, magnesium, calcium, strontium, barium, and lanthanum, wherein the content, expressed by weight of oxide based on the silica weight, of said element or elements or said compounds of elements contained in said catalyst is between 0.01 and 35%, wherein said silica, following the incorporation of said element or elements or said compounds of elements, has a specific surface of at least 100 m2/g, and wherein the modification is conducted by impregnating into the silica an aqueous solution of said additive, and resultant silica is dried and calcined.