METHOD FOR PRODUCTION OF ALKYL-TERT-ALKYL ETHERS Russian patent published in 1998 - IPC

FIELD: organic chemistry. SUBSTANCE: method involves production of alkyl-tert-alkyl ethers by interaction of isoolefins with alcohols, the process is carried out in the presence of acid heterogenic catalysts. Tertiary olefins comprising in hydrocarbon mixtures are used. The process takes place by consequent direct-flow and counterflow contact with output of stream comprising preferably unreacted hydrocarbons into fractionation rectifying zone and with stream being saturated by alkyl-tert-alkyl ethers into fractionation stripping zone. Said streams are removed of fractionation zones for their counterflow contact, origin hydrocarbon fraction and alcohol(s) may be partially fed for counterflow contact. Direct-flow contact is realized at least in two or more reaction zones, the whole stream of alcohol(s) being fed for direct-flow contact are supplied into the first reaction zone. Stream of origin hydrocarbon mixture (its quantity being 30-90 % of total supply) is fed into the first reaction zone, residual amount is fed into consequent direct-flow zone(s) and/or into upper part of fractionation stripping zone of counterflow reaction device. Alternative method according to which alcohol(s) and hydrocarbon fraction are fed into the first direct-flow reaction zone in such amount that molar ratio of alcohol(s) and tert-olefins is 1.2-2.0 being more preferable. It is preferable to fed portion of origin hydrocarbon fraction into fractionation stripping zone by 1-10 plates lower than supply of reaction mass from direct-flow reaction zones takes place. EFFECT: improved efficiency of the method. 4 cl, 1 dwg