METHOD OF PROCESSING ISOBUTENE-CONTAINING HYDROCARBON MIXTURE AND ALCOHOL C OR C Russian patent published in 2008 - IPC C07C2/08 C07C41/06 C07C11/02 C07C43/04 

FIELD: processing of isobutene-containing hydrocarbon mixture and alcohol C₁ or C₂.

SUBSTANCE: proposed method includes joint chemical transformations of isobutene and said alcohol at forming of alkyl-tert-butyl ether, dimmers, trimmers, isobutene and probably codimmers and trimmers of isobutene with n-butenes in reaction zone (zones) at temperature ranging from 30 to 100 C in presence of highly acid solid catalyst and probably mixture of water at total molar ratio of alcohol to isobutene in flows fed to reaction zone (zones) equal to 0.1: 1 to 0.9:1; then flow containing mainly unreacted hydrocarbons C₄ is separated from reaction mixture by rectification and subsequent rectification distillation of flow containing alkyl-tert-butyl ether and flow containing mainly isobutene dimmers from remaining reaction mixture (mixtures) is carried out; isobutene may be subjected to hydrogenation at maintenance of alcohol C₁ or C₂ in concentration of no less than 0.33 mass-% which is achieved through limitation of temperature and/or time of contact with catalyst and through delivery of additional amount of alcohol to last reaction zone; it is preferably to obtain content of alcohol no less than 0.5 mass-% but not exceeding its total amount permissible in target products and distilled with hydrocarbons C₄ contained in said reaction mixture; during distillation of reaction products, pressure of from 0.025 to 0.15 Mpa and temperature in still (stills) of from 80 to 180 C shall be maintained.

EFFECT: possibility of depression of oligo- and polymerization of isobutene, thus reducing degree of catalyst deactivation.

14 cl, 3 dwg, 3 tbl, 14 ex