Hydrotreating of fischer-tropsch derived feeds prior to oligomerization using an ionic liquid catalyst

Abstract

A process for oligomerizing a Fischer-Tropsch derived feed containing oxygenates which comprises (a) reducing significantly the oxygenates present in the Fischer-Tropsch derived feed by contacting said feed with a hydrotreating catalyst under hydrotreating conditions in a hydrotreating zone and recovering from the hydrotreating zone a Fischer-Tropsch derived hydrotreated feed which contains a significantly reduced amount of oxygenates as compared to the Fischer-Tropsch derived feed and also a significant amount of paraffins; (b) pyrolyzing the Fischer-Tropsch derived hydrotreated feed in a thermal cracking zone under thermal cracking conditions pre-selected to crack the paraffin molecules to form olefins and collecting an olefin-enriched Fischer-Tropsch feed from the thermal cracking zone; (c) contacting the olefin-enriched Fischer-Tropsch feed with a Lewis acid ionic liquid catalyst in an oligomerization zone under oligomerization reaction conditions; and (d) recovering from the oligomerization zone a Fischer-Tropsch derived product having molecules characterized by a higher average molecular weight and increased branching as compared to the Fischer-Tropsch derived feed.

Description

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AI Technical Summary

Benefits of technology

The patent describes how to make better quality fuel from natural gas by first creating a chemical called fischer-tropsch which can be used to produce different types of fuel. To get these fuels ready for use they have to go through several steps including being heated up, mixed with other substances like alcohols or acids, and then treated with special catalysts that help them break down into smaller parts. These small parts are also important because they affect things like how well the fuel burns and its ability to resist damage caused by sunlight and oxidation (which leads to yellowing). By making sure these tiny parts are present and properly formed, researchers hope to create higher quality fuel that's easier to work with and has improved performance characteristics.

Problems solved by technology

The technical problem addressed in this patent is the deactivation of ionic liquid catalysts used in the oligomerization of hydrocarbon products from the Fischer-Tropsch process due to the presence of oxygenates in the recovered materials. The patent proposes a solution to this problem by using a specific process to convert the oxygenates to alcohols and then removing them through a separation process.

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