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Processes and systems for conversion of acyclic hydrocarbons

A technology for acyclic hydrocarbons and cyclic hydrocarbons, which is used in the field of conversion of acyclic hydrocarbons and systems, and can solve problems affecting product selectivity, catalyst life, mechanical performance decline, aging, etc.

Active Publication Date: 2019-12-03
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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)

Method used

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  • Processes and systems for conversion of acyclic hydrocarbons
  • Processes and systems for conversion of acyclic hydrocarbons
  • Processes and systems for conversion of acyclic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] Example 1 - Reactor Performance Modeling

[0190] Reactor modeling was performed using Invensys Systems Inc. PRO / II 9.3.4 to evaluate performance under various commercially relevant operating conditions. Results will vary depending on the details of the modeling, but the model will still demonstrate the relative benefits of the invention. Many modifications and variations are possible, and it is to be understood that within the scope of the claims, the invention may be practiced otherwise than as specifically described herein.

[0191]Example 1A - Methane diluent, 20 psia outlet pressure, 10 psia HC partial pressure

[0192] Simulate a fluidized bed reactor with an outlet pressure of 20 psia and an outlet temperature of 575°C, where the feed contains n-pentane, which is preheated to 621°C, and then fed into the fluidized bed, and the co-feed contains methane and hydrogen, which Separately preheated to a temperature supplying 100% of the heat of reaction. Under these ...

Embodiment 1B

[0193] Example 1B - Methane diluent, 950°C co-feed preheat, 10 psia outlet HC partial pressure

[0194] As a comparison with Example 1A, a fluidized bed reactor with an outlet temperature of 575°C was simulated, where the feed consisted of n-pentane, which was preheated to 621°C before being fed into the fluidized bed, and the co-feed consisted of methane and hydrogen, which are separately preheated to 950 °C. Under these conditions, it is assumed that the light species selectivity of the catalyst (C 4- product) was -18%. It is assumed that the residence time within the catalyst bed provides the CPD concentration to reach its thermodynamic concentration at the reactor outlet conditions. The hydrogen molar rate in the reactor co-feed was set such that the hydrogen: n-pentane molar ratio in the feed was 1:1. The methane molar rate in the reactor co-feed was set to provide 100% of the heat of reaction. The total outlet pressure for all components except methane (including hyd...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/32C07C13/15B01J29/44B01J29/90B01J37/00
CPCB01J29/44B01J29/62B01J29/90B01J38/04C07C5/373C07C2521/08C07C2523/42C07C2529/44C07C2529/62C07C2601/10C10G9/28C10G11/05Y02P20/584C07C13/15
Inventor N·桑嘉L·L·亚西诺C·L·贝克
Owner EXXONMOBIL CHEM PAT INC
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