| abstract |
A method for producing polymerizable olefinic monomers, in particular for production of tall oil based biopolymers such as polyolefins. The method consists of 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. The tall oil is catalytically deoxygenated and the flow exiting the bed are cooled and separated into a liquid and a gas phase. The liquid phase, containing hydrocarbons, is subjected to steam cracking to provide final product containing polymerizable olefins. The deoxygenation in the catalytic bed can be followed by a catalytic cracking within the same bed or, with a suitable catalyst, the deoxygenation and cracking can be done simultaneously. |