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Axial-radial flow multi-step feeding fixed bed reactor and paraxylene preparation method

A fixed-bed reactor, axial and radial technology, applied in chemical instruments and methods, condensation between hydrocarbons and non-hydrocarbons, organic chemistry, etc., can solve problems that have not been involved, to improve selectivity, The effect of fewer products and lower production costs

Pending Publication Date: 2022-03-25
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above studies focus on the design of catalysts with high activity, high selectivity and high stability, and have not involved in the design and structure optimization of the equipment-reactor for the reaction process.

Method used

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  • Axial-radial flow multi-step feeding fixed bed reactor and paraxylene preparation method
  • Axial-radial flow multi-step feeding fixed bed reactor and paraxylene preparation method
  • Axial-radial flow multi-step feeding fixed bed reactor and paraxylene preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0059] This embodiment provides a fixed-bed reactor with axial radial flow multi-step feeding, such as figure 1 As shown, the fixed-bed reactor includes a shell 10 and a three-stage catalyst bed 20 arranged inside the shell 10, and the shell 10 includes an air inlet 30, four liquid inlets 40 and 1 product outlet 50, the liquid inlet 40 is located on the side wall of the shell 10 between every two stages of catalyst beds 20, the center of the catalyst bed 20 is provided with an axial air guide pipe 60, and the axial air guide pipe 60 The ends are closed, and the side walls are evenly distributed with air outlets. The top end of the first-stage axial air duct 61 protrudes from the first-stage catalyst bed 21 and is connected to the gas inlet 30 .

[0060] In this embodiment, a gas guide area 70 is also provided between the side wall of the catalyst bed 20 and the housing 10, the top and bottom of the catalyst bed 20 are closed, and the gas guide area 70 Closed top, open bottom...

Embodiment 2

[0063] This embodiment provides a fixed-bed reactor with axial radial flow multi-step feeding, such as figure 1 As shown, the fixed bed reactor includes a shell 10 and a three-stage catalyst bed 20 arranged inside the shell 10, and the shell 10 includes one gas inlet 30, eight liquid inlets 40 and 1 product outlet 50, the liquid inlet 40 is located on the side wall of the shell 10 between every two stages of catalyst beds 20, the center of the catalyst bed 20 is provided with an axial air guide pipe 60, and the axial air guide pipe 60 The ends are closed, and the side walls are evenly distributed with air outlets. The top end of the first-stage axial air duct 61 protrudes from the first-stage catalyst bed 21 and is connected to the gas inlet 30 .

[0064] In this embodiment, a gas guide area 70 is also provided between the side wall of the catalyst bed 20 and the housing 10, the top and bottom of the catalyst bed 20 are closed, and the gas guide area 70 Closed top, open bott...

Embodiment 3

[0067] This embodiment provides a fixed-bed reactor with axial radial flow multi-step feeding, such as figure 1 As shown, the fixed-bed reactor includes a shell 10 and a three-stage catalyst bed 20 arranged inside the shell 10, and the shell 10 includes one gas inlet 30, six liquid inlets 40 and 1 product outlet 50, the liquid inlet 40 is located on the side wall of the shell 10 between every two stages of catalyst beds 20, the center of the catalyst bed 20 is provided with an axial air guide pipe 60, and the axial air guide pipe 60 The ends are closed, and the side walls are evenly distributed with air outlets. The top end of the first-stage axial air duct 61 protrudes from the first-stage catalyst bed 21 and is connected to the gas inlet 30 .

[0068] In this embodiment, a gas guide area 70 is also provided between the side wall of the catalyst bed 20 and the housing 10, the top and bottom of the catalyst bed 20 are closed, and the gas guide area 70 Closed top, open bottom...

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Abstract

The invention provides an axial-radial flow multi-step feeding fixed bed reactor and a preparation method of p-xylene. The fixed bed reactor comprises a shell and at least two sections of catalyst bed layers arranged in the shell, the shell comprises at least one gas inlet, 2-8 liquid inlets and at least one product outlet; the liquid inlet is formed in the side wall of the shell between every two sections of catalyst bed layers; an axial gas guide pipe is arranged in the center of the catalyst bed layer; the tail end of the axial air guide pipe is closed, and air outlet holes are evenly distributed in the side wall of the axial air guide pipe. The preparation method comprises the following steps: (1) introducing a mixed gas of carbon dioxide and hydrogen into a fixed bed reactor, and enabling the mixed gas to radially flow through a catalyst bed layer for hydrogenation reaction to generate methanol; and (2) introducing toluene into the fixed bed reactor, enabling toluene and methanol to flow through a catalyst bed layer in a radial direction, and carrying out alkylation reaction to generate p-xylene. The fixed bed reactor provided by the invention is especially suitable for preparation of p-xylene through coupling of carbon dioxide hydrogenation and toluene alkylation.

Description

technical field [0001] The invention belongs to the technical field of reactor design, relates to a fixed-bed reactor, in particular to a fixed-bed reactor with axial and radial flow multi-step feeding and a preparation method of p-xylene. Background technique [0002] As a greenhouse gas, carbon dioxide is of great strategic significance for alleviating the energy crisis and achieving the goal of "carbon neutrality". As one of the basic organic chemical raw materials in the petrochemical industry, p-xylene is mainly used in the production of synthetic resin, synthetic fiber and synthetic rubber. The traditional methods to obtain p-xylene are mainly through catalytic reforming of naphtha, isomerization of toluene, and alkylation of toluene and methanol, which are commonly used in recent years. However, the above methods all rely on fossil resources. Therefore, converting cheap carbon dioxide into high value-added product p-xylene can not only realize the resource utilizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/04B01J8/02C07C2/86C07C15/08
CPCB01J8/0446B01J8/0278C07C2/86C07C15/08
Inventor 吴青曲顺利郑俊迟春红周爱徽李飞飞赖育挺
Owner CHINA NAT OFFSHORE OIL CORP
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