Method for processing liquefied waste polymers
AssigneeNeste Oyj
InventorsHeikki Aaltonen, Antti Ojala, Ville Paasikallio, Antti Kurkijärvi
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Abstract
The present disclosure relates to methods for processing liquefied waste polymers containing diolefins and naphtha. Hydrotreatment A of the diolefins produces a diolefin depleted LWP feed which is separated by distillation B to give rise to one or more distillates containing at least a naphtha fraction, an optional middle fraction and a distillation bottom. Hydroprocessing C of the naphtha fraction gives rise to hydrogenated naphtha fraction which is suitable as a feed for a steam cracker D. The distillation bottom and the middle fraction can mixed with crude oil and used in oil refinerery since they are predominantly free from diolefins.
Claims17
A method for processing liquefied waste polymers (LWP), the method comprising the following steps:
- a) providing a LWP stream containing diolefins and naphtha;
- b) subjecting the LWP stream to hydrotreatment reaction conditions in a presence of hydrogen and one or more hydrotreatment catalyst to produce diolefin depleted LWP stream, wherein the hydrotreatment reaction conditions include temperature 120-210° C. and pressure 1-50 barg;
- c) distilling the diolefin depleted LWP stream to obtain one or more distillates including at least a naphtha fraction boiling below 180° C. at atmospheric pressure and a distillation bottom;
- and
- d) subjecting the naphtha fraction of step c) to hydroprocessing reaction conditions in a presence of hydrogen and one or more hydroprocessing catalysts to produce hydrogenated naphtha.
Dependencies are inferred from the claim text.