Method and apparatus for obtaining aromatics from diverse feedstock

A technology for aromatics and reforming units, applied in chemical instruments and methods, only multi-stage series refining and cracking process treatment, hydrocarbon oil treatment, etc., can solve low consumption and other problems

Active Publication Date: 2013-08-21
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The above processes are not integrated into a single system, which offers significant advantages through the operation of the individual processes including higher yields of petrochemicals with lower consumption, and where benzene and toluene are "deliberately" produced from refinery feed streams To provide better feed to the alkylation reactor selected to produce para-xylene (PX)

Method used

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  • Method and apparatus for obtaining aromatics from diverse feedstock
  • Method and apparatus for obtaining aromatics from diverse feedstock
  • Method and apparatus for obtaining aromatics from diverse feedstock

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Embodiment Construction

[0025] According to the present invention, in embodiments, there is a process for producing paraxylene using a feed stream comprising naphtha, and a system adapted thereto, for selective use in the production of paraxylene prior to contacting with a methylating agent. The naphtha-containing feed stream is treated in the presence of a toluene catalyst to increase its benzene and / or toluene content.

[0026] In embodiments, the process comprises: (a) dealkylation and / or transalkylation and / or cracking (D / T / C) of a naphtha stream via a catalyst under reaction conditions to enrich benzene and and / or toluene and the production of light paraffinic by-products; (b) adding a methylating agent to all or part of at least the benzene / toluene component of the product from step (a) and subjecting the mixture to selectivity for the production of Catalyst contacting of para-xylene to produce para-xylene and light olefinic or light paraffinic by-products; (c) recovering purified para-xylene f...

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Abstract

The process relates to the use of any naphtha-range stream containing a portion of C8+ aromatics combined with benzene, toluene, and other non-aromatics in the same boiling range to produce toluene. By feeding the A8+ containing stream to a dealkylation/transalkylation/cracking reactor to increase the concentration of toluene in the stream, a more suitable feedstock for the methylation reaction can be produced. This stream can be obtained from a variety of sources, including the pygas stream from a steam cracker, "cat naphtha" from a fluid catalytic cracker, or the heavier portion of reformate.

Description

[0001] Cross-references to related applications [0002] This patent application claims priority to US Provisional Patent Application No. 61 / 421,917, filed December 10, 2010, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to processes for obtaining purified aromatics from various feedstocks, more particularly to processes for the production of paraxylene (PX) from naphtha feedstocks, and also to systems for practicing the same. Background technique [0004] Xylene isomers exist in a wide variety of applications. They are especially valuable as intermediates in chemical synthesis. For example, in the case of terephthalic acid, para-xylene (PX) is the raw material, terephthalic acid is used to make synthetic fibers and bottle plastics, meta-xylene (MX) is used to make dyes, and o-xylene (OX ) If used as a raw material for phthalic anhydride, it is used for the preparation of plasticizers. PX is currently the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/66C07C15/08C07C2/12C07C2/08C07C7/13B01J19/24
CPCC07C2/864B01J2219/00006C07C5/2729C07C5/2767C10G55/04C10G55/06C10G57/005C10G2400/30C07C15/08
Inventor J·M·埃尔里奇R·D·斯特拉克J·W·丽贝克A·S·高利克L·L·亚西诺G·C·伍德S·H·布朗
Owner EXXONMOBIL CHEM PAT INC
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