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Methods for operating acetylene hydrogenation units in integrated steam cracking and fluidized catalytic dehydrogenation systems

A technology for acetylene hydrogenation and fluidized catalysis, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, etc., can solve downstream process safety problems, downstream processes and catalysts are harmful, etc. problems to reduce the likelihood and prevent overhydrogenation and losses

Active Publication Date: 2022-02-25
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrocarbon cracking and other processes used to produce light olefins can produce by-products and impurities, such as acetylene and propadiene compounds, which are detrimental to downstream processes and catalysts
Furthermore, the presence of high concentrations of acetylene can pose safety concerns for downstream processes due to the reactivity of these compounds

Method used

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  • Methods for operating acetylene hydrogenation units in integrated steam cracking and fluidized catalytic dehydrogenation systems
  • Methods for operating acetylene hydrogenation units in integrated steam cracking and fluidized catalytic dehydrogenation systems
  • Methods for operating acetylene hydrogenation units in integrated steam cracking and fluidized catalytic dehydrogenation systems

Examples

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example

[0107] Embodiments of the present disclosure will be further illustrated by the following examples, which should not be construed as limitations of the disclosed and / or claimed embodiments of the present invention.

example 1

[0108] Example 1: Generation and analysis of FCDh effluent

[0109] In Example 1, an FCDh effluent was generated and its composition analyzed for C3+ compounds and C3- compounds. Propane dehydrogenation was performed in a modified Davidson cycle riser (DCR) pilot unit with in situ fuel combustion in the regeneration section. Approximately 4100 grams of supported Ga-Pt catalyst was loaded in the circulation system, and it was calculated that there were approximately 90 grams of catalyst in the reactor at any given time. The riser (reactor) inlet temperature was controlled at 630°C and the pressure was set at 90 kilopascals (kPa) gauge (13 psig or 191 kPa / 27.7 psia absolute). High purity propane is injected into the system to achieve a propane weight hourly space velocity (WHSV) of about 3.5 hourly. Nitrogen (N 2 ) is mainly fed into the system as the carrier gas of the catalyst. The partial pressure of propane is about 30 kPa (4.3 psig) gauge. The temperature range for c...

example 2

[0116] Example 2: Modeling of an Acetylene Hydroprocessing Unit for Integrated FCDh and Steam Cracking

[0117] A well-practiced empirical model for acetylene hydrogenation units was used to evaluate the effect of hydrogenation from an integrated FCDh and steam cracking system (in which a portion of the cracked gas and a portion of the FCDh effluent is combined with the feed to the acetylene hydrogenation unit 50). The change in ΔT of the first hydrogenation reactor and the change in the overall ethylene selectivity of the acetylene hydrogenation unit occurs upon sudden loss of the FCDh stream of the hydrogen feed (partially combined and split). By comparing the ΔT of the first hydrogenation reactor and the overall ethylene selectivity of the hydrogenation unit to the combined hydrogenation feed (e.g., the C3 / C3-fraction of the FCDh effluent and the C3 / C3-fraction of the cracked gas) with the second A comparison of the ΔT of a hydrogenation reactor and the hydrogenation unit...

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Abstract

A method for operating an acetylene hydrogenation unit in an integrated steam cracking-fluidized catalytic dehydrogenation (FCDh) system may include separating a cracked gas from a steam cracking system and an FCDh effluent from an FCDh system into a hydrogenation feed and an acetylene-depleted stream, the hydrogenation feed comprising at least hydrogen, CO, and acetylene. During normal operating conditions, at least 20% of the CO in the hydrogenation feed is from the cracked gas. The method may include contacting the hydrogenation feed with an acetylene hydrogenation catalyst to hydrogenate at least a portion of the acetylene in the hydrogenation feed to produce a hydrogenated effluent. The steam cracking is operated under conditions that increase CO production such that a concentration of CO in the cracked gas is great enough that when a flowrate of the FCDh effluent is zero, a CO concentration in the hydrogenation feed is at least 100 ppmv.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 865,594, filed June 24, 2019, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The present disclosure relates generally to chemical processing systems for the production of olefins and their operation, and more particularly to methods for operating an acetylene hydrogenation unit in an olefins production process including a stream integrated with a steam cracking process Catalyzed dehydrogenation (FCDh) process. Background technique [0004] Light olefins serve as building blocks for the production of many types of goods and materials. For example, ethylene can be used to make polyethylene, ethylene chloride, or ethylene oxide. Such products can be used in product packaging, construction, textiles, etc. Therefore, there is an industrial need for light olefins, such as ethylene, propylene and but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/18
CPCC10G65/18C10G9/36C10G11/00C10G51/04C07C7/167C10G45/32C10G69/06C10G70/02C07C5/333C07C4/04C07C5/3337C07C2523/62C07C11/04C07C11/06B01J23/62
Inventor 骆林王杭耀刘育M·T·普雷兹A·马雷克
Owner DOW GLOBAL TECH LLC