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Fluidized bed reactor and method for producing nitrile compound using same

A fluidized bed reactor and a manufacturing method technology, applied in chemical instruments and methods, organic chemical methods, hydrocarbon ammoxidation preparation, etc., can solve problems such as nozzle material corrosion, catalyst particle reduction degradation, reactor material degradation, etc. The effect of preventing material deterioration, preventing high temperature heat generation, and preventing adverse effects

Active Publication Date: 2019-05-31
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the catalyst is deposited on the recesses, protrusions, etc. inside the reactor, heat removal may not be performed smoothly, and hot spots (hotspots) may be generated in the reactor, resulting in deterioration of the material of the reactor at the accumulation part of the catalyst particles, Corrosion of materials such as nozzles
In addition, there are cases where the gas phase oxidation reaction is adversely affected due to reduction and degradation of the catalyst particles due to accumulation of the catalyst particles, which reduces the yield of the target reaction.

Method used

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  • Fluidized bed reactor and method for producing nitrile compound using same
  • Fluidized bed reactor and method for producing nitrile compound using same
  • Fluidized bed reactor and method for producing nitrile compound using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] In a gas-phase oxidation fluidized bed reactor for the production of acrylonitrile by the ammoxidation reaction of propylene using a metal oxide catalyst containing molybdenum, the manhole installed on the wall surface made of SUS27 of the reactor main body is placed A SUS27 inner cover (diameter 900mm x depth 300mm) that is consistent with the inner diameter of the manhole is attached to the manhole from the inner wall side of the reactor so that there is no level difference between the periphery of the recess and the surface of the inner wall side of the inner cover. After the inside of the recess on the outside of the cover is covered with a calcium silicate heat insulating material (230mm x 110mm x 65mm brick shape), the entire remaining gap inside the manhole around the heat insulating material is filled with Portland cement to The surface of the periphery of the concave portion was dried so as not to have a difference in height, and then covered with an outer cover...

Embodiment 2

[0113] Except that the heat insulating material made of calcium silicate was replaced by refractory bricks, and Portland cement was replaced by refractory cement, the same operation as in Example 1 and the comparison before and after the operation were carried out, and the results were the same as in Example 1. , Compared with before the anti-deposition component was installed, after the anti-deposition component was installed, there was no catalyst accumulation, so no deterioration of the material was seen.

[0114] When the outer cover was opened after the operation stopped, the temperature around the manhole rose to 150°C before installing the anti-deposition member, but it did not reach a high temperature that hindered the work when it was opened after the anti-deposition member was installed.

Embodiment 3

[0116] Except that the SUS27 was replaced with the SUS304 which had been surface-treated by nickel plating, the same operation as in Example 1 and the comparison before and after the operation were carried out. Previously, after the anti-deposition parts were installed, there was no catalyst accumulation, so the deterioration of the material was not seen.

[0117] When the outer cover was opened after the operation stopped, the temperature around the manhole rose to 150°C before installing the anti-deposition member, but it did not reach a high temperature that hindered the work when it was opened after the anti-deposition member was installed.

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Abstract

The present invention prevents the catalyst from accumulating in the concave portion of the inner wall of the reactor, thereby preventing deterioration of the device or adverse effects on the reaction. Furthermore, it is possible to prevent the catalyst accumulated in the concave portion of the inner wall of the reactor from rapidly heating due to contact with the outside air. In addition, catalyst particles are prevented from accumulating on protruding parts inside the reactor, thereby preventing deterioration of the material of the device or adverse effects on the reaction. Furthermore, it is possible to prevent the catalyst particles deposited on the protruding portion of the reactor from rapidly heating due to contact with the outside air.

Description

technical field [0001] The present invention relates to a fluidized bed reactor, and specifically relates to a fluidized bed reactor capable of preventing accumulation of catalyst particles inside the fluidized bed reactor and a method for producing a nitrile compound using the fluidized bed reactor. Background technique [0002] Fluidized bed reactors are used in various industrial reactions. For example, nitrile compounds such as acrylonitrile are industrially produced by ammoxidation of hydrocarbons such as propylene. As a method for producing a nitrile compound, a method of performing a gas-phase oxidation reaction in the presence of a metal oxide catalyst is generally known. It is described that this gas-phase oxidation reaction is to introduce oxygen-containing gases such as hydrocarbons, ammonia, and air as raw materials into a reactor, and carry out ammoxidation reaction in the presence of the metal oxide catalyst to produce nitrile compounds (Patent Document 1, Pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/24C07C253/26C07C255/08C07B61/00
CPCB01J8/24C07B61/00C07C253/26Y02P20/52C07C255/08B01J8/1872B01J2208/00946
Inventor 井上健一
Owner MITSUBISHI CHEM CORP
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