Method for producing olefinic monomers from bio oil

摘要

The invention relates to a method of producing olefinic monomers for the production of a polymer. The invention particularly relates to the production of tall oil-based biopolymers, such as polyolefins. In the stages of the method
bio oil, with a content of over 50% of fatty acids of tall oil and no more than 25% of resin acids of tall oil, and hydrogen gas are fed into a catalyst bed (7);the oil is catalytically deoxygenated in the bed by hydrogen;the flow exiting the bed is cooled down and divided into a hydrocarbon-bearing liquid phase (10) and a gas phase; andthe hydrocarbon-bearing liquid (13) is subjected to steam cracking (4) to provide a product containing polymerizing olefins.;The deoxygenation in the bed can be followed by a catalytic cracking or, with a suitable catalyst, the deoxygenation and cracking can be simultaneous. The separated hydrogen-bearing gas phase can be circulated in the process.

主权项

1. A method of producing olefinic monomers for the production of a polymer, comprising the following stages:
feeding bio oil and hydrogen gas into a catalyst bed, wherein said bio oil is a fraction separated from crude tall oil, said bio oil consisting of 95% to 98% fatty acids of tall oil and 2% to 5% of resin acids of tall oil; catalytically deoxygenating the bio oil by with hydrogen in the catalyst bed in the presence of a deoxygenation catalyst; cooling down and dividing a flow exiting the catalyst bed into a hydrocarbon-bearing liquid phase containing at least a portion of aromatics and a hydrogen-bearing gas phase; separating water from the hydrocarbon-bearing liquid phase to obtain a hydrocarbon-bearing liquid; and subjecting the hydrocarbon-bearing liquid containing said at least a portion of aromatics to stream cracking to form a product containing olefinic monomers.