PROCESS FOR PREPARING ALKYL TERT-ALKYL ETHERS Russian patent published in 1999 - IPC

FIELD: petrochemistry, particularly, high-octane components of motor fuels. SUBSTANCE: hydrocarbon fraction containing tertiary C₄-C₅ olefins is made to contact with aliphatic alcohol in the presence of solid acid catalyst and organic addition agent in system comprising at least one reaction zone filled with catalyst, said zone being connected with at least exhaustive and strengthening rectification zones. From top of strengthening rectification zone, steam stream is taken, and some reflux stream is recycled to strengthening rectification zone. The product is taken from system still. Organic additive includes N-nitrosodiphenyl amine (NDPHA) in amount to assure its concentration in still product from 0.001 to 0.5 wt %, or mixture thereof with phenol- type compound at NDPHA to phenol-type compound ratio from 1:100 to 10:1. It is preferable to introduce NDPHA into exhausting rectification zone or system still, and phenol-type compound into reflux or steam streams. EFFECT: higher efficiency. 3 cl, 11 ex