Process for preparing fumaric acid by spraying acid water to benzene anhydride oxidized tail gas

A technology for oxidizing tail gas and fumaric acid, which is applied in the preparation of carboxylate, the preparation of organic compounds, the separation/purification of carboxylic acid compounds, etc., can solve problems such as waste of resources and environmental pollution, reduce labor intensity and eliminate environmental Pollution, the effect of increasing economic benefits

Active Publication Date: 2007-08-29
山东宏信化工股份有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a process for preparing fumaric acid by spraying acid water with phthalic anhydride oxidation ta...

Method used

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  • Process for preparing fumaric acid by spraying acid water to benzene anhydride oxidized tail gas

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The acid water sprayed from the phthalic anhydride plant is filtered through the first stage to remove the undissolved phthalic acid in the acid water, and then enters the first-stage acid pool. Most of the phthalic acid is precipitated here, and the acid water after the phthalic acid is precipitated is filtered through the second stage to remove the precipitated phthalic acid, and the filtrate enters the secondary acid pool. The purpose of acid water cooling and filtration is to remove phthalic acid in acid water and improve the purity of fumaric acid. The recovered phthalic acid is sold as a by-product after drying.

[0025] The acid water after removal of phthalic acid is pumped into the decolorization kettle, and the acid water can be pumped in while steaming, when the pumping volume is 25m 3 When the temperature rises, stop pumping, continue heating and start stirring. When the temperature rises to 65°C, add 60kg of activated carbon and 10-60Kg of diatomaceous eart...

Embodiment 2-8

[0026] Embodiment 2-8: basically the same as the embodiment, except that the process parameters are in accordance with Table 1.

[0027] The processing parameter of table 1 embodiment 2-8

[0028] Example

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Abstract

The invention relates to a technology to make fumaric acid. The feature is that benzene anhydride oxidation tail gas spraying acid takes isomerization under effect of thiourea catalyst after removing phthalic acid and decoloring. The invention has the advantages of simple technology, low cost, obvious economic and environment benefits.

Description

technical field [0001] The invention belongs to the technical field of fumaric acid, and in particular relates to a process for preparing fumaric acid by spraying acid water with phthalic anhydride oxidation tail gas. Background technique [0002] According to reports, the content of toxic substances in phthalic anhydride waste gas is 200ppm phthalic anhydride, 100-600ppm maleic anhydride, 10-30ppm naphthoquinone, 10-100ppm aldehydes, 1000-10000ppm CO, 1000-10000ppm CO 2 6000-50000ppm. Exhaust gas is highly toxic and has a pungent smell, and direct discharge will pollute the air. [0003] At present, the commonly used waste gas treatment methods are: incineration method and recycling method. Among them, the recovery methods mainly include: recovering maleic anhydride from the washing liquid, and isomerizing maleic anhydride in the washing liquid to produce fumaric acid. [0004] "Chemical Environmental Protection" 2003, Volume 23, Phase 1, Page 54-56, Zhu Xiaohui et al. ...

Claims

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Application Information

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IPC IPC(8): C07C57/15C07C51/353C07C51/42
Inventor 董长胜马新明
Owner 山东宏信化工股份有限公司
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