Method and process arrangement for producing hydrocarbons

A process arrangement for producing hydrocarbons from plastic-based raw material by means of a gasification in an integrated process, in which the integrated process comprises at least one gasification unit for forming a gasification product, at least one steam cracking unit for forming a cracking product, and at least one recovery unit for recovering hydrocarbons, wherein the process arrangement further comprises

• the gasification unit comprising at least one fluidized bed gasifier for gasifying the plastic-based raw material with steam and for forming the gasification product,
• at least one cooling device for cooling the gasification product rapidly after the gasification to a temperature of below 640° C. for slowing and/or stopping chemical reactions after the gasification,
• the gasification unit further comprising at least one quench tower into which the gasification product, which has been cooled to below 640° C., is supplied and in which the gasification product is treated and condensable components are removed from the gasification product for forming a treated gasification product,
• at least one device for pressurizing the treated gasification product such that pressure of the treated gasification product is 1-3 bar,
• means for supplying the treated gasification product and the cracking product of the steam cracking unit to the recovery unit to separate and recover desired hydrocarbons such that the treated gasification product and the cracking product are combined before the recovery unit to form a feed of the recovery unit, and
• a main quench tower to which the feed of the treated gasification product and the cracking product is supplied and from which the feed is supplied to the recovery unit for the recovery unit to separate and recover hydrocarbons from the feed.