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Process for recovering maleic anhydride using diisobutyl hexahydrophthalate as solvent

A technology of diisobutyl phthalate and hexahydrogenation, which is applied in organic chemistry and other fields, can solve problems such as increasing production costs, and achieve the effects of weak hydrophilicity, low saturated vapor pressure, and good chemical stability

Active Publication Date: 2017-11-07
ZIBO QIXIANG TENGDA CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the n-butane oxidation to maleic anhydride process, the reaction gas contains a large amount of water vapor, which puts forward higher requirements for the stability of the recovered solvent and the affinity for water, and DBP is easy to decompose when it encounters water, thus increasing the Cost of production

Method used

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  • Process for recovering maleic anhydride using diisobutyl hexahydrophthalate as solvent

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Experimental program
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Effect test

Embodiment 1

[0040] A kind of technique that reclaims maleic anhydride with diisobutyl hexahydrophthalate as solvent:

[0041](1) The content of maleic anhydride in the n-butane oxidation reaction gas is 0.9mol%. The reaction gas is fed from the lower part of the absorption tower 2 through the reaction gas pipeline 1, and the DIBE poor solvent is fed from the absorption tower 2 tower through the poor solvent pipeline 3. Feed, the two are countercurrently contacted in the absorption tower 2, and the DIBE poor solvent absorbs and cools the maleic anhydride. The lean solvent feed temperature is 45° C., and m (lean solvent) / m (reaction gas) is 0.05. n-butane, CO, CO discharged from the top of absorption tower 2 2 , nitrogen and other VOC tail gases are discharged to the tail gas treatment system by the tail gas pipeline 4, and what is obtained at the bottom of the tower is the rich DIBE solvent that has absorbed maleic anhydride.

[0042] (2) The temperature of the reaction gas is 130°C; the...

Embodiment 2

[0053] A kind of technique that reclaims maleic anhydride with diisobutyl hexahydrophthalate as solvent:

[0054] (1) The content of maleic anhydride in the n-butane oxidation reaction gas is about 1.8mol%. The reaction gas is fed from the lower part of the absorption tower 2 through the reaction gas pipeline 1, and the DIBE poor solvent is fed from the absorption tower 2 through the poor solvent pipeline 3. The top feed, the two are countercurrently contacted in the absorption tower 2, and the DIBE poor solvent absorbs and cools the maleic anhydride. The lean solvent feed temperature is 80° C., and m (lean solvent) / m (reaction gas) is 0.5. n-butane, CO, CO discharged from the top of absorption tower 2 2 , nitrogen and other VOC tail gases are discharged to the tail gas treatment system by the tail gas pipeline 4, and what is obtained at the bottom of the tower is the rich DIBE solvent that has absorbed maleic anhydride.

[0055] (2) The temperature of the reaction gas is 19...

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Abstract

The invention belongs to a maleic anhydride recovery technique, and particularly relates to a technique for recovering maleic anhydride by using diisobutyl hexahydrophthalate as a solvent, which comprises the following steps: a DIBE lean solvent and n-butane oxidation reaction generation gas perform counterflow contact in an absorption tower to obtain a rich solvent, the rich solvent is subjected to flash evaporation and analyzed into crude maleic anhydride and the DIBE lean solvent in an analysis tower, the crude maleic anhydride enters a buffer tank, the DIBE lean solvent is cooled and recycled, light-component gas extracted from the top of the buffer tank and flash evaporation gas from the flash evaporation tank contain a small amount of maleic anhydride, and the maleic anhydride is recycled again in an analysis exhaust absorption tower. By using the DIBE as the absorbent, the technique can effectively avoid the problem that the traditional organic solvent can be easily decomposed when meeting water, and is suitable for large-scale continuous production of maleic anhydride from n-butane.

Description

technical field [0001] The invention belongs to a process for recovering maleic anhydride, in particular to a process for recovering maleic anhydride using diisobutyl hexahydrophthalate as a solvent. Background technique [0002] Currently, maleic anhydride recovery methods mainly include water absorption method and organic solvent absorption method. The organic solvent absorption method can effectively overcome the shortcomings of the water absorption method, such as high energy consumption, easy corrosion of equipment, and low maleic anhydride yield, and has gradually replaced the water absorption method as the mainstream of maleic anhydride production. The organic solvent widely used at present is dibutyl phthalate (DBP). The patents with the patent numbers "CN201410370875.0", "CN201310029013.7", and "CN201110126507.8" all use DBP as the absorption solvent. However, in the n-butane oxidation to maleic anhydride process, the reaction gas contains a large amount of water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/60
CPCC07D307/60
Inventor 于东和焦卫车平生张春峰冯伟
Owner ZIBO QIXIANG TENGDA CHEM
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