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Process for preparing p-xylene

A technology of p-xylene and xylene, which is applied in the field of preparing p-xylene and can solve the problems of hydrogen consumption and the like

Active Publication Date: 2020-02-14
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some methods have been proposed to upgrade these streams to produce BTX, but they consume expensive hydrogen while producing lower value light saturates instead of higher value light olefins

Method used

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  • Process for preparing p-xylene
  • Process for preparing p-xylene
  • Process for preparing p-xylene

Examples

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preparation example Construction

[0034] Zeolite ZSM-5 and conventional methods of preparation are described in US Patent 3,702,886. Zeolite ZSM-11 and its general method of preparation are described in US Patent 3,709,979. Zeolite ZSM-12 and its general method of preparation are described in US Patent 3,832,449. Zeolite ZSM-23 and its general method of preparation are described in US Patent 4,076,842. Zeolite ZSM-35 and its general method of preparation are described in US Patent 4,016,245. ZSM-48 and its general method of preparation are taught by US Patent 4,375,573. The entire disclosures of these US patents are incorporated by reference into this application.

[0035] The medium pore zeolites described above are preferred for the process of the invention because their pore size and shape favor the production of para-xylene over the other xylene isomers. However, the values ​​of the diffusion parameters of these zeolites in conventional form exceed the preferred values ​​for the present invention of 0....

Embodiment 1

[0087] Embodiment 1 (comparative example)

[0088] figure 1 A process flow 100 of a comparative example different from the present invention is shown by way of example. In this process, a feed stream 101 comprising gas, water and fresh methanol, toluene and benzene is fed to mixing device M1 where it is mixed with a recycle stream 106 comprising benzene and toluene to form a combined stream 103 , the combined stream 103 is sent to the alkylation reactor R1. In Rl, benzene and toluene are reacted with methanol in the presence of an alkylation catalyst such as a zeolite molecular sieve to obtain a first reaction product mixture stream 105 comprising benzene, toluene and mixed xylenes. Stream 105 is passed to a first separation apparatus S1 (rectification column), where a light stream 106 comprising benzene and toluene and a xylene stream 107 comprising xylenes are produced. Additional streams, collectively referred to as stream 108 , may also be generated from S1 that may inc...

Embodiment 2

[0090] Embodiment 2 (the present invention)

[0091] figure 2A method flow 200 of the present invention is schematically shown. In this process, a feed stream 201 comprising water, gas and fresh methanol and toluene and / or benzene is fed to mixing device M1 where it is combined with a recycle stream 206 comprising toluene and a recycle stream comprising toluene Streams 225 combine to form combined stream 203, which is delivered to alkylation reactor R1. In R1, toluene and / or benzene is reacted with methanol in the presence of an alkylation catalyst, such as a zeolite molecular sieve, to obtain a first reaction product mixture stream 205 comprising toluene, mixed xylenes, and optionally benzene. Stream 205 is passed to a first separation apparatus S1 (rectification column), where a light stream 206 comprising toluene and optionally benzene and a xylene stream 207 comprising mixed xylenes are produced. Other streams may also be generated from S1, collectively referred to as ...

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Abstract

A process for producing para-xylene from toluene and / or benzene is disclosed, comprising (i) converting toluene and / or benzene into a first product mixture containing mixed xylenes, (ii) obtaining di a toluene mixture, (iii) separating para-xylene from said xylene mixture, and (iv) transalkylating m-xylene and / or ortho-xylene with toluene and / or benzene.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to US Provisional Application 62 / 082,885, filed November 21, 2014, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a process for the preparation of p-xylene. In particular, the present application relates to a process for producing para-xylene from a feed containing toluene and / or benzene. Background technique [0004] Xylene isomers have a wide variety of applications. They are especially valuable as intermediates in chemical processes. For example, para-xylene is a raw material for terephthalic acid used in the manufacture of polyester fibers and films, meta-xylene is used in the manufacture of dyes, and ortho-xylene is used as a raw material for phthalic anhydride used in the manufacture of plasticizers. Para-xylene is currently the most valuable xylene isomer, and although there has been a gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/86C07C15/08
CPCC07C2/864C07C2/865C07C15/08C07C6/123C07C6/126C07C7/04C07C7/13C07C7/14C07C2529/06Y02P20/10C07C15/06B01D3/009C07C2/66C07C6/04
Inventor R·G·廷格G·D·莫尔
Owner EXXONMOBIL CHEM PAT INC