Process to make olefins from isobutanol

摘要

A process for the conversion of an alcohol mixture may include introducing into a reactor a stream including the alcohol mixture mixed with a stream including olefins having 4 carbon atoms or more. The process may include contacting the stream with a single catalyst at a temperature above 500° C. in the reactor at conditions effective to dehydrate isobutanol, forming C4+ olefins, and to catalytically crack the C4+ olefins. The single catalyst may be an acid catalyst adapted to cause both the dehydration and catalytic cracking. The process may include recovering an effluent including ethylene, propylene, and water, and fractionating the effluent.

主权项

1. A process for the conversion of an alcohols mixture comprising about 20 to 100 weight percent isobutanol to make essentially propylene, comprising:
a) introducing in a reactor a stream comprising the alcohols mixture, mixed with a stream comprising olefins having 4 carbon atoms or more (C4+ olefins), optionally water, optionally an inert component, b) contacting said stream with a single catalyst at a temperature above 500° C. in said reactor at conditions effective to dehydrate at least a part of the isobutanol and other alcohols, if any, forming C4+ olefins and catalytically crack the C4+ olefins, wherein the single catalyst is an acid catalyst adapted to cause both the dehydration and the catalytic cracking, wherein the single catalyst is a porous crystalline aluminophosphate containing at least one 10 and/or 12 member ring in the structure thereof, c) recovering from said reactor an effluent comprising: ethylene, propylene, water, optionally unconverted alcohols of the alcohols mixture, various hydrocarbons, and optionally the optional inert component of step a), d) fractionating said effluent of step c) to produce at least an ethylene stream, a propylene stream, a fraction consisting essentially of hydrocarbons having 4 carbon atoms or more, water and optionally the optional inert component of step a), optionally recycling ethylene in whole or in part at an inlet of the reactor, optionally recycling the fraction consisting essentially of hydrocarbons having 4 carbon atoms or more at the inlet of the reactor.