Methods and systems for converting acyclic hydrocarbons

A technology for acyclic hydrocarbons and cyclic hydrocarbons, applied in the field of conversion of acyclic hydrocarbons and systems, can solve the problems of carburizing, affecting product selectivity, catalyst life, catalyst activity loss, etc.

Active Publication Date: 2022-06-28
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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  • Methods and systems for converting acyclic hydrocarbons
  • Methods and systems for converting acyclic hydrocarbons
  • Methods and systems for converting acyclic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] Example 1 - Modeling of Reactor Performance

[0190] Reactor modeling was performed using Invensys Systems Inc. PRO / II 9.3.4 to evaluate performance under various commercially relevant operating conditions. Depending on the details of the modeling, the results will vary, but the model will still demonstrate the relative benefits of the invention. Many modifications and variations are possible, and it should 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, 20psia outlet pressure, 10psia HC partial pressure

[0192] A fluidized bed reactor simulating 20 psia outlet pressure, 575 °C outlet temperature, where the feed contained n-pentane, which was preheated to 621 °C, was then fed into the fluidized bed, and the co-feed contained methane and hydrogen, which Separately preheated to a temperature that supplies 100% of the heat of reaction. Under these co...

Embodiment 1B

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

[0194] As a comparison to Example 1A, a fluidized bed reactor with an outlet temperature of 575°C was simulated, where the feed contained n-pentane, which was preheated to 621°C, and then fed into the fluidized bed, and the co-feed contained methane and hydrogen, which were separately preheated to 950°C. Under these conditions, the light selectivity of the catalyst (C 4- product) was -18%. The residence time within the catalyst bed is assumed to provide the CPD concentration to reach its thermodynamic concentration at the reactor outlet conditions. The hydrogen molar rate in the reactor co-feed was set so that the molar ratio of hydrogen:n-pentane 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 of all components except methane, including hydrogen, was set to 10 psia by adjusting the tot...

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Abstract

The present invention relates to the conversion of acyclic hydrocarbons to olefins, cyclic hydrocarbons and / or aromatics in a reactor system, such as the conversion of acyclic C 5 Process and system for the conversion of hydrocarbons to cyclopentadiene. 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 olefins, cyclic hydrocarbons, and / or aromatics. It is also possible to provide the at least one reaction zone comprising H 2 、C 1 -C 4 Alkanes and / or C 1 -C 4 Olefin co-feeds.

Description

[0001] priority claim [0002] This application claims priority to US 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 methods and reactor systems for converting acyclic hydrocarbons to olefins, cyclic hydrocarbons and / or aromatics. [0005] Background of the Invention [0006] Cyclic hydrocarbons, olefins and aromatic compounds such as cyclopentadiene ("CPD") and its dimer dicyclopentadiene ("DCPD"), ethylene, propylene and benzene, are widely used throughout the chemical industry for various A highly desirable raw material in various products (eg, polymeric materials, polyester resins, synthetic rubbers, solvents, fuels, fuel additives, etc.). These compounds are typically derived from various streams produced during petroleum refining processing. In particular, CP...

Claims

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Application Information

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Patent Type & Authority Patents(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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