PRODUCTION OF LOWER OLEFIN

摘要

PURPOSE:To stably obtain the titled compound from methanol and/or dimethyl ether in high selectivity for a long period, by using a specific catalyst prepared by modifying an alkaline earth metal-containing aluminoborosilicate with an alkaline earth metal-containing compound. CONSTITUTION:Methanol or ethanol or both in the vapor phase are brought into contact with a catalyst to produce the titled compound. In the process, a modified catalyst prepared by hydrothermal treatment of a raw material satisfying the respective molar ratios as follows; 12-3,000 SiO2/Al2O3, 1-1,000 SiO2/B2O3, 0.02-10 OH<->/SiO2, 1-2,000 H2O/SiO2 and 0.01-3 tetra propylammonium compound/SiO2 and atomic ratio as follows; 0.03-300 alkaline earth metal/Al at 80-250 deg.C temperature and blending or supporting >=0.25wt% alkaline earth metal expressed in terms of the metal on the resultant fired zeolite having the composition expressed by the formula (M<1> is alkali metal or H; M<2> is alkaline earth metal; a is 0-2; b is 0.1-100; c is 12-3,000; n is 0-30) is used to improve the catalyst life.