Maleic anhydride plant solvent dehydration drying process and equipment

A technology for drying treatment and solvent is applied in the field of solvent dehydration and drying treatment process and equipment of maleic anhydride plant, which can solve the problems of poor absorption, reduced maleic anhydride yield, difficulty in solvent treatment and increased loss, and achieves reduction of decomposition loss, The effect of reducing the generation of impurities and smooth and long-term operation

Active Publication Date: 2022-04-12
淄博海益精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Exceeding the water content of the poor solvent will lead to poor absorption or the formation of maleic acid and fumaric acid in the system, which reduces the yield of maleic anhydride and increases the difficulty and loss of subsequent solvent treatment

Method used

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  • Maleic anhydride plant solvent dehydration drying process and equipment
  • Maleic anhydride plant solvent dehydration drying process and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A solvent dehydration and drying treatment process of a maleic anhydride unit. The desalted water is mixed with an organic solvent and then centrifuged. The obtained organic phase is preheated by a flash tank heat exchanger and heated to 100°C in a flash tank heater, and then enter the solvent flash tank for flash evaporation, so that the water content in the solvent is ≤0.02%, and the obtained dry solvent enters the maleic anhydride absorption tower for recycling.

[0048] in:

[0049] The mixing of desalted water and organic solvent is carried out in a stirring tank, and then centrifuged for centrifugation, wherein: the mixing volume ratio of desalted water and organic solvent is 6:4; desalted water is preheated to 75°C; the stirring time of the stirring tank 30min, the operating temperature of the stirring tank is 68°C; the speed of the centrifuge is 4800r / min.

[0050] The mass flow rate of the solvent phase at the bottom of the centrifuge is 8000kg / h, and the temp...

Embodiment 2

[0065] A maleic anhydride device solvent dehydration drying treatment process, the desalted water is mixed with the organic solvent and then centrifuged, the obtained organic phase is preheated by the flash tank heat exchanger, heated to 95°C in the flash tank heater, and then enter the solvent flash tank for flash evaporation, so that the water content in the solvent is ≤0.02%, and the obtained dry solvent enters the maleic anhydride absorption tower for recycling.

[0066] in:

[0067] The mixing of desalted water and organic solvent is carried out in a stirring tank, and then centrifuged for centrifugation, wherein: the mixing volume ratio of desalted water and organic solvent is 6:4; desalted water is preheated to 70°C; the stirring time of the stirring tank 30min, the operating temperature of the stirring tank is 65°C; the speed of the centrifuge is 4800r / min.

[0068] The mass flow rate of the solvent phase at the bottom of the centrifuge is 8000kg / h, and the temperatur...

Embodiment 3

[0079] A maleic anhydride device solvent dehydration drying treatment process, the desalted water is mixed with the organic solvent and then centrifuged, the obtained organic phase is preheated by the flash tank heat exchanger, heated to 98°C in the flash tank heater, and then enter the solvent flash tank for flash evaporation, so that the water content in the solvent is ≤0.02%, and the obtained dry solvent enters the maleic anhydride absorption tower for recycling.

[0080] in:

[0081] The mixing of desalted water and organic solvent is carried out in a stirring tank, and then centrifuged for centrifugation, wherein: the mixing volume ratio of desalted water and organic solvent is 6:4; desalted water is preheated to 80°C; the stirring time of the stirring tank 30min, the operating temperature of the stirring tank is 70°C; the speed of the centrifuge is 4800r / min.

[0082] The mass flow rate of the solvent phase at the bottom of the centrifuge is 8000kg / h, and the temperatur...

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Abstract

The invention belongs to the technical field of maleic anhydride solvent recovery, and in particular relates to a solvent dehydration and drying process and equipment for a maleic anhydride plant. The desalted water is mixed with the organic solvent and then centrifuged. The obtained organic phase is preheated by the flash tank heat exchanger, and then enters the flash tank heater to be heated to 95-100°C, and then enters the solvent flash tank for flash evaporation , so that the moisture content in the solvent is ≤0.02%, and the obtained dry solvent enters the maleic anhydride absorption tower for recycling. The maleic anhydride device solvent dehydration drying process and equipment of the present invention, for the solvent discharged from the bottom of the centrifuge, after the solvent is dried and flashed by heating, the water brought into the absorption section by the solvent washing section is further reduced, and the decomposition of maleic anhydride is reduced. Loss, reducing the formation of impurities, to ensure that the solvent absorption and analysis system can run smoothly for a long period of time.

Description

technical field [0001] The invention belongs to the technical field of maleic anhydride solvent recovery, and in particular relates to a solvent dehydration and drying process and equipment for a maleic anhydride plant. Background technique [0002] The production process of maleic anhydride by n-butane oxidation solvent absorption method is the mainstream process for producing maleic anhydride at home and abroad. The process is to generate a gas mixture containing maleic anhydride through the oxidation reaction of n-butane, then absorb the maleic anhydride with a solvent, and resolve the maleic anhydride in the desorption tower. Part of the resolved solvent enters the solvent recovery unit for treatment, and the other part directly enters the absorption tower for recycling. [0003] The following reactions mainly take place in the reactor: [0004] Main response: [0005] n-C 4 h 10 +3.5O 2 →C 4 h 2 o 3 +4H 2 o [0006] side effects: [0007] n-C 4 h 10 +4.5O ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/06
CPCB01D3/06
Inventor 高方军朱南南孙国梁
Owner 淄博海益精细化工有限公司
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