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Process for continuously producing succinic anhydride through hydrogenation of maleic anhydride

A technology for succinic anhydride and maleic anhydride, which is applied in the field of succinic anhydride production technology, can solve the problems of lowering the reaction performance of the catalyst, uniformly removing the distribution of the reaction liquid, unable to react heat, etc., and achieves high equipment utilization, good product quality, and technical Simple process effect

Active Publication Date: 2011-08-17
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for removing the reaction heat of smaller reaction devices. If the reaction device is enlarged, the heat transfer pipe will not be able to remove the reaction heat evenly and affect the distribution of the reaction liquid in the reactor, thereby reducing the catalyst reaction performance.

Method used

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  • Process for continuously producing succinic anhydride through hydrogenation of maleic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 First, slowly feed nitrogen into the reaction system through the pipeline to replace the air in the fixed bed. The oxygen content to be tested is 99.0%, start to fill the reactor with high-pressure hydrogen to a reaction pressure of 0.9MPa; start the raw material liquid metering pump, and adjust the liquid space velocity of the feed amount to 0.14h -1 , open the heat exchanger to preheat the maleic anhydride solution (THF solution of maleic anhydride, concentration 0.04g / ml) to 35°C, the outlet liquid of the reactor is split at a split ratio of 1 / 2, and the outlet liquid temperature of the circulating heat exchanger is adjusted to 50°C. Gradually adjust the liquid air velocity of the feed amount to 4.2 hours within 2 hours -1 . The reaction solution entering the rectification tower is rectified to obtain the finished product succinic anhydride and solvent, and the solvent is recycled after recovery. Under the above reaction conditions, the activity of the ca...

Embodiment 2

[0022] Example 2 First, nitrogen is slowly introduced into the reaction system through the pipeline to replace the air in the fixed bed, and the oxygen content to be tested is 99.0%, start to fill the reactor with high-pressure hydrogen to a reaction pressure of 8MPa; start the raw material liquid metering pump, and adjust the liquid space velocity of the feed amount to 0.14h -1 , open the heat exchanger to preheat the maleic anhydride solution (gamma-butyrolactone solution of maleic anhydride, concentration 0.08g / ml) to 35°C, the split ratio of the reaction liquid after the reactor is 1 / 3 split, adjust the circulating heat exchanger The outlet temperature was 60°C. Gradually increase the feed amount to normal within 2 hours, and the liquid space velocity of the normal feed amount is 1.4h -1 . The reaction solution entering the rectification tower is rectified to obtain the finished product succinic anhydride and solvent, and the solvent is recycled after recovery. Under the...

Embodiment 3

[0023] Example 3 First, slowly feed nitrogen into the reaction system through the pipeline to replace the air in the fixed bed, the oxygen content to be tested is 99.0%, start to fill the reactor with high-pressure hydrogen to a reaction pressure of 4MPa; start the raw material liquid metering pump, adjust the liquid space velocity of the feed amount to 0.14h -1 , open the heat exchanger to preheat the maleic anhydride solution (tetrahydrofuran solution of maleic anhydride, concentration 0.08g / ml) to 35°C, the split ratio of the reaction liquid after the reactor is 1 / 4 split, and the liquid temperature at the outlet of the circulating heat exchanger is adjusted to 80°C. Gradually increase the feed amount to normal within 2 hours, and the liquid space velocity of the normal feed amount is 2.8h -1 . Part of the reaction liquid is split into the rectification tower through the second-stage reactor to obtain the finished product succinic anhydride and solvent, and the solvent is ...

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Abstract

The invention provides a process for continuously producing succinic anhydride through hydrogenation of maleic anhydride, which comprises the following steps of: shunting solution of maleic anhydride in a split ratio of 1 / 5-1 / 2 after hydrogenation is performed on the solution of maleic anhydride through a trickle bed reactor; rectifying partial shunted reaction liquid into a rectifying tower to obtain finished products succinic anhydride and a solvent, and recycling the solvent; mixing the other liquid with the solution of maleic anhydride; and returning to the reactor after eliminating heat through a heat exchanger. The process successfully solves the problem of exothermic effect in the process of preparing the succinic anhydride through the hydrogenation of the maleic anhydride, meanwhile realizes continuous production of the succinic anhydride, and greatly improves the production capacity of the succinic anhydride with above 97.5 percent of the yield of the succinic anhydride; the process has the advantages of simple flow, high utilization rate of devices and good quality of products; the solvent can be recycled, and the operation cost is low; and the process is suitable for clean production and has good environmental benefit.

Description

technical field [0001] The invention relates to a production process of succinic anhydride, in particular to a process for continuously producing succinic anhydride through hydrogenation of maleic anhydride. Background technique [0002] Succinic anhydride (Succinic acid), also known as succinic anhydride, the molecular formula is C 4 h 4 o 3 , is an important organic synthetic raw material, widely used in medicine, food flavoring, pesticide, fine chemical industry, alkyd resin and other fields. In recent years, succinic anhydride has Applications such as glycol esters (PBS) and organic coatings have greatly increased the demand. [0003] The current production methods of succinic anhydride can be divided into three methods: succinic acid dehydration method, biological fermentation method and maleic anhydride hydrogenation method. The maleic anhydride hydrogenation method is divided into the electrochemical reduction method and the maleic anhydride direct hydrogenation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/60B01J8/02
Inventor 赵永祥张因秦晓琴张鸿喜高春光刘新文
Owner SHANXI UNIV
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