Process and device for producing maleic anhydride by n-butane selective oxidation

A technology of selective oxidation and n-butane, which is applied in the field of maleic anhydride production, can solve the problems of high catalyst preparation and activation process requirements, lower n-butane conversion rate and maleic anhydride yield, and reduce the effective volume of the reactor, so as to improve the catalytic performance. Effect of oxidizing environment, uniform distribution, and elimination of hot spots

A technology of selective oxidation and n-butane, which is applied in the field of maleic anhydride production, can solve the problems of high catalyst preparation and activation process requirements, lower n-butane conversion rate and maleic anhydride yield, and reduce the effective volume of the reactor, so as to improve the catalytic performance. Effect of oxidizing environment, uniform distribution, and elimination of hot spots

CN108546256APending Publication Date: 2018-09-18ZIBO QIXIANG TENGDA CHEM
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  • Process and device for producing maleic anhydride by n-butane selective oxidation
  • Process and device for producing maleic anhydride by n-butane selective oxidation
  • Process and device for producing maleic anhydride by n-butane selective oxidation

Examples

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Effect test

Embodiment 1

[0039] A process for producing maleic anhydride by selective oxidation of n-butane comprises the following steps:

[0040] (1) The n-butane is vaporized in the n-butane evaporator 7 and overheated in the n-butane superheater 8 in turn, then enters the n-butane / auxiliary mixer 9 to mix with the auxiliary agent, and then enters the air / n-butane mixture device 4;

[0041] (2) The air is mixed with humidified steam in the humidified mixer 2, and enters the air / n-butane mixer 4 after being heated by the air heater 3 to mix with the n-butane obtained in step 1 and the auxiliary agent mixture;

[0042] (3) The mixed material enters the reactor 13 to react, and the generated gas is discharged to the next unit;

[0043] Wherein: the reactor 13 is provided with a plurality of tubes 19, and the catalysts are filled in the tubes 19, and the outer shell of the tubes 19 is divided into 4 thermal chambers 18 which are not connected up and down by the separator 17. The inlets of the heat ch...

Embodiment 2

[0059] A process for producing maleic anhydride by selective oxidation of n-butane comprises the following steps:

[0060] (1) The n-butane is vaporized in the n-butane evaporator 7 and overheated in the n-butane superheater 8 in turn, then enters the n-butane / auxiliary mixer 9 to mix with the auxiliary agent, and then enters the air / n-butane mixture device 4;

[0061] (2) The air is mixed with humidified steam in the humidified mixer 2, and enters the air / n-butane mixer 4 after being heated by the air heater 3 to mix with the n-butane obtained in step 1 and the auxiliary agent mixture;

[0062] (3) The mixed material enters the reactor 13 to react, and the generated gas is discharged to the next unit;

[0063] Wherein: the reactor 13 is provided with a plurality of tubes 19, and the catalysts are filled in the tubes 19, and the outer shell of the tubes 19 is divided into 4 thermal chambers 18 which are not connected up and down by the separator 17. The inlets of the heat ch...

Embodiment 3

[0079] A process for producing maleic anhydride by selective oxidation of n-butane comprises the following steps:

[0080] (1) The n-butane is vaporized in the n-butane evaporator 7 and overheated in the n-butane superheater 8 in turn, then enters the n-butane / auxiliary mixer 9 to mix with the auxiliary agent, and then enters the air / n-butane mixture device 4;

[0081] (2) The air is mixed with humidified steam in the humidified mixer 2, and enters the air / n-butane mixer 4 after being heated by the air heater 3 to mix with the n-butane obtained in step 1 and the auxiliary agent mixture;

[0082] (3) The mixed material enters the reactor 13 to react, and the generated gas is discharged to the next unit;

[0083] Wherein: the reactor 13 is provided with a plurality of tubes 19, and the catalysts are filled in the tubes 19, and the outer shell of the tubes 19 is divided into 4 thermal chambers 18 which are not connected up and down by the separator 17. The inlets of the heat ch...

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Abstract

The invention belongs to the field of maleic anhydride production, and particularly relates to a process and a device for producing maleic anhydride by n-butane selective oxidation. The n-butane is vaporized, heated, and mixed with an auxiliary sequentially, and then enters an air / n-butane mixer; the air is mixed with humidified steam in a humidification mixer, and heated by an air heater and thenenters the air / n-butane mixer to be mixed with the mixture of the n-butane and the auxiliary; the mixed material enters a reactor to react, and a produced gas is discharged to a next unit; the reactor is internally provided with a plurality of tubes, the tubes are filled with catalysts, and the shell pass outside each tube is divided by clapboards into a plurality of heat taking chambers which are not communicated with each other up and down; the inlet of each heat taking chamber is connected with a heat taking medium inlet tube, and the outlet of each heat taking chamber is connected with aheat taking medium outlet tube; a flow control valve is arranged between each heat taking chamber and the corresponding heat taking medium inlet pipe. The process and device provided by the inventioncan effectively prevent the local overheating of the reactor, improve the activity of the catalysts, and prolong the service life of the catalysts.

Description

technical field [0001] The invention belongs to the field of maleic anhydride production, in particular to a process and device for producing maleic anhydride through selective oxidation of n-butane. Background technique [0002] Maleic anhydride, maleic anhydride for short, also known as maleic anhydride, is an important organic chemical raw material, widely used in petrochemical, food processing, medicine, building materials and other industries. According to the raw material route, the production method of maleic anhydride can be divided into benzene oxidation method and n-butane oxidation method. The n-butane method has the advantages of cheap raw materials, relatively light pollution, high utilization rate of carbon atoms and low production cost of maleic anhydride. trend. [0003] The core of the maleic anhydride production technology is the gas-solid phase catalytic oxidation reaction of n-butane and air in a reactor filled with a vanadium phosphorus oxygen catalyst...

Claims

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Application Information

Patent Timeline
18 Sep 2018
Publication
CN108546256A
IPC
C07D307/60
CPC
C07D307/60
Inventors
冯伟; 王二伟