Novel production process for maleic anhydride through two-stage solvent absorption

A solvent absorption and production process technology, applied in the field of maleic anhydride production, can solve the problems of system shutdown, heat exchange system and analysis vacuum system blockage, etc., to reduce absorption and cooling load, avoid equipment investment waste, and improve parking cleaning system Effect

Inactive Publication Date: 2019-08-23
SHANDONG HUIFENG PETROCHEM GRP CO LTD
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  • Abstract
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Problems solved by technology

However, some coke powder, tars, acrylic acid polymers and other high-condensing-point substances will be generated during the reaction process. These substances enter the absorption tower and are absorbed by the solvent, and then gradually accumulate in the subsequent system, resulting in heat exchange system and analytical vacuum system. Blockage, which will cause the system to stop in severe cases

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  • Novel production process for maleic anhydride through two-stage solvent absorption

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Effect test

Embodiment 1

[0026] A novel two-stage solvent absorption maleic anhydride production process comprises the following steps:

[0027] (1) The maleic anhydride reaction product gas at 150°C is fed from the lower part of the pre-absorption tower 2 through the reaction product gas line 1, and the solvent is fed from the top of the pre-absorption tower 2, and the reaction product gas is cut off from the solvent in the pre-absorption tower 2 to mix;

[0028] (2) The solvent in the pre-absorption tower 2 pre-absorbs the reaction product gas, and the gas phase at the top of the tower enters the absorption tower 7 and is absorbed again by the solvent. The bottom of the pre-absorption tower 2 is a section of rich solvent that has absorbed maleic anhydride and high freezing point substances;

[0029] (3) After the absorption of the absorption tower 7 is completed, the tower top gas phase enters the waste gas treatment unit 8, and the bottom of the absorption tower 7 is the second section rich solvent...

Embodiment 2

[0033] A novel two-stage solvent absorption maleic anhydride production process comprises the following steps:

[0034] (1) Feed the maleic anhydride reaction gas at 170°C from the lower part of the pre-absorption tower 2 through the reaction gas pipeline 1, and feed the solvent from the top of the pre-absorption tower 2, and the reaction gas is cut off from the solvent in the pre-absorption tower 2 to mix;

[0035] (2) The solvent in the pre-absorption tower 2 pre-absorbs the reaction product gas, and the gas phase at the top of the tower enters the absorption tower 7 and is absorbed again by the solvent. The bottom of the pre-absorption tower 2 is a section of rich solvent that has absorbed maleic anhydride and high freezing point substances;

[0036] (3) After the absorption of the absorption tower 7 is completed, the tower top gas phase enters the waste gas treatment unit 8, and the bottom of the absorption tower 7 is the second section rich solvent that has absorbed malei...

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Abstract

The invention belongs to the technical field of maleic anhydride production, and particularly relates to a novel production process for maleic anhydride through two-stage solvent absorption. The process comprises the following steps: firstly reaction production gas of the maleic anhydride enters a pre-absorption tower, after the reaction production gas and a solvent are tangentially mixed, a first-stage rich solvent is obtained at the bottom of the pre-absorption tower, a gas phase at the top of the pre-absorption tower enters an absorption tower and is absorbed by a solvent to obtain a second-stage rich solvent, the first-stage rich solvent is filtered through a filter, the filtered first-stage rich solvent and the second-stage rich solvent are mixed to enter a stripping tower, a gas phase component at the top of the stripping tower returns to the absorption tower, a material at the bottom of the stripping tower is sent to a desorption tower, desorbed crude maleic anhydride enters a refining unit from the top of the desorption tower, and a solvent at the bottom of the desorption tower enters the pre-absorption tower for recycling. The process provided by the invention can furtherreduce absorption and cooling load of the absorption tower system by the two-stage solvent recovery, can shift an impurity removal system process forwards to prevent the impurities from being accumulated in a subsequent system, and is suitable for large-scale continuous production of the maleic anhydride.

Description

technical field [0001] The invention belongs to the technical field of maleic anhydride production, and in particular relates to a novel two-stage solvent-absorbed maleic anhydride production process. Background technique [0002] The recovery process of maleic anhydride in the existing maleic anhydride production process generally adopts water absorption or solvent absorption. A large amount of acid water containing fumaric acid and acrylic acid will be produced in the water absorption process, and the water absorption process is only suitable for intermittent operation, which is not conducive to large-scale production. This process has been gradually eliminated. At present, the main maleic anhydride production process is mainly based on solvent absorption, and the solvent is mainly DIBE or DBP. Solvent regeneration is mainly based on water washing to remove some impurities such as acrylic acid, acetic acid, maleic anhydride, butanol and some solvents (DIBE, DBP) in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60
CPCC07D307/60
Inventor 高方军蒲叶学
Owner SHANDONG HUIFENG PETROCHEM GRP CO LTD
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