Processes and systems for conversion of acyclic hydrocarbons

Abstract

The invention relates to processes and systems for converting acyclic hydrocarbons to alkenes, cyclic hydrocarbons and/or aromatics, for example converting acyclic C5 hydrocarbons to cyclopentadiene in a reactor system. The process includes contacting a feedstock comprising acyclic hydrocarbons with a catalyst material in at least one reaction zone to convert at least a portion of the acyclic hydrocarbons to a first effluent comprising alkenes, cyclic hydrocarbons and/or aromatics. A co-feed comprising H2, C1-C4 alkanes and/or C1-C4 alkenes may also be provided to the at least one reaction zone.

Description

[0001] priority claim [0002] This application claims priority to U.S. Provisional Application Serial No. 62 / 500,898, filed May 3, 2017, and European Application No. 17181734.9, filed July 17, 2017, the disclosures of which are incorporated herein by reference. [0003] field of invention [0004] The present invention relates to processes and reactor systems for converting acyclic hydrocarbons to olefins, cyclic hydrocarbons and / or aromatics. [0005] Background of the invention [0006] Cyclic hydrocarbons, olefins and aromatics, such as cyclopentadiene (“CPD”) and its dimer dicyclopentadiene (“DCPD”), ethylene, propylene and benzene, are widely used throughout the chemical industry in various A highly desirable raw material in various products (eg, polymer materials, polyester resins, synthetic rubbers, solvents, fuels, fuel additives, etc.). These compounds are generally derived from various streams produced during petroleum refining processes. In particular, CPD is cur...

AI Technical Summary

Problems solved by technology

The production of CPD is particularly difficult in endothermic processes because it favors low pressure and high temperature, but competing reactions such as n-pentane and other C 5 cracking of hydrocarbons) may occur at relatively low temperatures (e.g. 450°C–500°C)

[0020] Other challenges may include loss of catalyst activity during the process due to coking and further processing required to remove coke from the catalyst, and the inability to use oxygen-containing gases directly to provide the heat input required to counteract the endothermic nature of the reaction without damaging the catalyst

In addition, non-uniform catalyst aging can occur, which can affect final product selectivity and catalyst lifetime

[0021] Furthermore, since the reaction is carried out at elevated temperature and highly carburized conditions, there are challenges in reactor design, especially in terms of material selection

Under desired reaction conditions, metal alloys may undergo carburization (resulting in loss of mechanical properties) and metal dusting (resulting in metal loss via formation of metastable carbides)

Images