Neste Oyj

Hemanathan Kumar

Ronny Wahlström

Annika Malm

Tuula Lehtimaa

Olli Byman

Chunfen Jin

Satu Vatanen

The present invention relates to a method for producing renewable hydrocarbons from an oxygen containing renewable feedstock, the feedstock comprising dissolved impurities selected from impurities comprising phosphorus and impurities comprising at least one metal, the feedstock further comprising at least one of triglycerides and free fatty acids. The method comprises obtaining a net elementary charge based on phosphorus and the at least one metal of a first feedstock; mixing the first feedstock with an elementary charge balancing component to obtain the feedstock to be purified, which feedstock to be purified has a net elementary charge within a range of from −5 to 15 mmol elementary charge/kg of the feedstock to be purified; subjecting the feedstock to be purified to heat treatment at a temperature of 180-400° C. in order to precipitate compounds containing said phosphorus and said at least one metal; removing formed precipitate compounds comprising said at least one metal and said phosphorus to obtain a purified feedstock; and subjecting the purified feedstock to a hydrotreatment using a catalyst sensitive to at least one of said impurities.

Method for producing renewable hydrocarbons

The present invention relates to a method for reducing an amount of dissolved impurities in an oxygen containing renewable feedstock, the dissolved impurities being selected from impurities comprising phosphorus and impurities comprising at least one metal. The method comprises obtaining a net elementary charge of a first feedstock; mixing the first feedstock with an elementary charge balancing component to obtain the feedstock to be treated, whereby the feedstock to be treated has a net elementary charge which is closer to zero net elementary charge than the net elementary charge of the first feedstock; and subjecting the feedstock to be treated to a heat treatment at a temperature of 180-400° C. in order to precipitate compounds containing said phosphorus and said at least one metal.

Method for reducing amount of dissolved impurities in a renewable feedstock

A method for preparing hydrocarbons includes subjecting a renewable feedstock comprising lipophilic phosphorus compounds to a hydrotreatment process to form hydrocarbons from the renewable feedstock. In some embodiments, the content of the lipophilic phosphorus compounds in the renewable feedstock can be in a range of between 2 parts per million by weight (wppm) and 0.1 wppm so that deactivation of a catalyst used in the hydrotreatment process is reduced or avoided. In some embodiments, a feedstock can be determined to include an amount of 'difficult to remove' phosphorus and the result thereof can be used for selecting a suitable pretreatment to which the feedstock can then be subjected. The pretreated renewable feedstock can then be hydrotreated catalytically.

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Porvoo, Finland

Hemanathan Kumar