Neste. has filed a patent for a method to process liquefied waste polymers containing diolefins and naphtha. The process involves hydrotreatment, distillation, and hydroprocessing to produce hydrogenated naphtha suitable for a steam cracker. The remaining fractions can be used in oil refineries. GlobalData’s report on Neste gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Neste, Microscale biofuel reactors was a key innovation area identified from patents. Neste's grant share as of January 2024 was 54%. Grant share is based on the ratio of number of grants to total number of patents.

Processing liquefied waste polymers containing diolefins and naphtha

Source: United States Patent and Trademark Office (USPTO). Credit: Neste Corp

The patent application (Publication Number: US20240034946A1) describes a method for processing liquefied waste polymers (LWP) involving several steps. The method includes providing an LWP stream containing diolefins and naphtha, subjecting the LWP stream to hydrotreatment reaction conditions with hydrogen and catalysts to produce a diolefin depleted LWP stream, distilling the diolefin depleted stream to obtain distillates including a naphtha fraction, and subjecting the naphtha fraction to hydroprocessing conditions to produce hydrogenated naphtha. The process involves specific temperature and pressure ranges for the reactions, as well as the use of specific catalysts like CoMo and NiMo.

Furthermore, the method includes additional steps such as feeding the hydrogenated naphtha to a steam cracker, admixing the distillation bottom with crude oil to form an admixture, and feeding the admixture to a crude oil distillation unit. The method also involves feeding the middle fraction obtained during distillation to a crude oil distillation unit. The LWP used in the process can be waste plastic pyrolysis oil or hydrothermally liquefied waste plastic oil. The patent application outlines the specific conditions and catalysts required for each step of the process, emphasizing the efficient conversion of LWP into valuable products like hydrogenated naphtha for further industrial use.

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