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Recovery and separation system and method for xylene from water-absorption cis-butenedioic anhydride production process

A technology of xylene and maleic anhydride, which is applied in the field of maleic anhydride post-treatment water absorption process, to achieve the effects of eliminating potential safety hazards, ensuring safe operation, and effective separation

Inactive Publication Date: 2012-04-25
天津市化工设计院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the existing technical problems, the present invention discloses a new process system and method for xylene recovery and separation in a maleic anhydride production device, which solves potential safety hazards in the production process and reduces raw material consumption, and improves the economical efficiency of the maleic anhydride production device. benefit

Method used

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  • Recovery and separation system and method for xylene from water-absorption cis-butenedioic anhydride production process
  • Recovery and separation system and method for xylene from water-absorption cis-butenedioic anhydride production process
  • Recovery and separation system and method for xylene from water-absorption cis-butenedioic anhydride production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Implementation of working condition 1 Decanter discharge liquid 1 Separation of xylene and process water

[0019] Decanter discharge liquid: 6~8m3

[0020] Xylene: 4~5m3

[0021] Process water: 2~3m3

[0022] Operating pressure: normal pressure

[0023] Operating temperature: 58°C

[0024] After dehydration and refining, the mixed liquid 1 of xylene and process water in the decanter is discharged into the separator 10 stably through valve control. In the separator 10, the emulsification is broken through the demulsifier, and the density difference between the xylene and the process water is used for layer separation. The xylene flows into the xylene storage tank 4 through the upper part of the separator 10, and the process water flows into the process water through the bottom of the separator. After the storage tank 3 and the mixed liquid 1 of xylene and process water in the decanter are discharged, the discharge valve is closed. This method does not require extern...

Embodiment 2

[0026] Implementation of working condition 2 vacuum system condensate 2 xylene and process water separation

[0027] Vacuum system condensate: 800~1000kg / hr

[0028] Xylene: 50~70kg / hr

[0029] Process water: 800~1000kg / hr

[0030] Operating pressure: normal pressure

[0031] Operating temperature: 60°C

[0032] In the de-xylene stage of vacuum rectification, the vacuum system tail gas condensate 2 containing xylene is continuously discharged into the separator 10 . In the separator 10, the emulsification is broken through the demulsifier, and the density difference between the xylene and the process water is used for layer separation. The xylene flows into the xylene storage tank 4 through the upper part of the separator 10, and the process water flows into the process water through the bottom of the separator. Tank 3. Dehydration and refining recover about 150-200kg of xylene per batch. After the vacuum system stops working, the discharge of the tail gas condensate 2 i...

Embodiment 3

[0034] Implementation of working condition 3 process water mixture 9 treatment

[0035] During the operation of the maleic anhydride plant, when the process water storage tank 3 contains xylene, the mixture 9 of xylene and process water in the process water storage tank 3 can be pumped in through the process water pump 5 through the upper liquid outlet of the process water storage tank 3 In the separator 10, the density difference between xylene and process water is used for layered separation and recovery of xylene. The xylene flows into the xylene storage tank 4 through the upper part of the separator 10, and the process water flows into the process water storage tank 3 through the bottom of the separator. The pure xylene in the xylene storage tank 4 is injected into the dehydration and refining kettle 8 of the post-treatment process through the xylene pump 6, and the pure process water in the process water tank 3 is injected into the absorption tower 7 of the recovery proce...

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Abstract

The invention discloses a recovery and separation system and method for xylene from a water-absorption cis-butenedioic anhydride production process. The method comprises the steps that: the materials in a decanter discharge liquid or vacuum system condensate discharge pipeline are introduced to a separator, the xylene and process water mixed liquid is demulsified by a demulsifier in the separator, layering separation is carried out by utilizing the density difference between xylene and process water, xylene flows into a xylene storage tank from the upper part of the separator, and the process water flows into a process water storage tank from the bottom of the separator. When the xylene mixed liquid exists in the process water storage tank, the mixed liquid is pumped to the separator by a process water pump, the mixed liquid is demulsified and settled in the separator for layering separation of xylene and process water, and then xylene and process water respectively return to the storage tank for recovery. By adopting the method, 1.5 kg of xylene is recovered when per ton of cis-butenedioic anhydride product is obtained, and 30000 kg of xylene can be recovered every year from a cis-butenedioic anhydride device with the productivity of 20000 ton / year. More importantly, the potential safety hazards are excluded, and the safe operation of water absorption cis-butenedioic anhydride production is guaranteed.

Description

technical field [0001] The invention relates to a post-treatment water absorption process of maleic anhydride (abbreviated as maleic anhydride), a method for recovering and separating xylene in vacuum system condensate and process water. Background technique [0002] Maleic anhydride is a commonly used basic and important organic chemical raw material. It is the second largest acid anhydride raw material after phthalic anhydride in the world, and its downstream products have quite broad development and application prospects. Since the beginning of the new century, my country's maleic anhydride industry has continued to develop at a high speed, and maleic anhydride has become an indispensable and important organic chemical raw material product in the development of the national economy. [0003] The post-treatment process of the maleic anhydride production unit adopts water absorption process, and xylene is used as a dehydrating agent in the production process for recycling....

Claims

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Application Information

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IPC IPC(8): B01D17/025B01D17/04C07C15/08C07C7/00
Inventor 畅志坚戴文惠栢萌刘长霞胡小营周亚萍
Owner 天津市化工设计院
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