Electrochemical treatment method of maleic anhydride acid water

A treatment method and electrochemical technology, applied in chemical instruments and methods, water/sewage treatment, natural water treatment, etc., can solve the problems of waste acid water treatment efficiency, secondary pollution, economy, etc., to prevent corrosion problems and avoid costs. Effect

Active Publication Date: 2021-12-07
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of treatment efficiency, secondary pollution and economical efficiency of the waste acid water produced in the tail gas elution treatment of the preparation of maleic anhydride by n-butane oxidation, the present invention proposes a new treatment method, which takes the maleic anhydride in the waste acid water Succinic acid is converted into high value-added succinic acid to realize the secondary utilization of acid water

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  • Electrochemical treatment method of maleic anhydride acid water
  • Electrochemical treatment method of maleic anhydride acid water
  • Electrochemical treatment method of maleic anhydride acid water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Take 500g of waste acid solution and heat it to 40°C, which contains 122.36g of maleic acid, 0.423g of fumaric acid, 7.13g of formic acid, 7.85g of acetic acid, and 8.21g of propionic acid. The cathode uses Pb electrode and the anode uses Ru-Ir / Ti-coated electrodes, the area of ​​a single tube electrode is 0.0025m 2 ,, the number of tubes is 8, the current density is 1000A / m 2 . According to the calculation, electrolysis needs to be divided into two stages, and the electrolysis time is 1.5h and 1.3h respectively. After the second-stage electrolysis, the solid obtained by the second crystallization was dried to obtain 94.86 g of succinic acid solid, the purity of succinic acid was 98.3%, and the recovery rate of maleic acid was 74.9%. The filtrate was taken for analysis, which contained 10.41 g of maleic acid, 20.22 g of succinic acid, 0.324 g of fumaric acid, 6.35 g of formic acid, 6.87 g of acetic acid, and 7.31 g of propionic acid.

Embodiment 2

[0065] Take 500g of waste acid solution and heat it to 40°C, which contains 122.36g of maleic acid, 0.423g of fumaric acid, 7.13g of formic acid, 7.85g of acetic acid, and 8.21g of propionic acid. The cathode uses Pb electrode and the anode uses PbO 2 / Ti coated electrode, the area of ​​a single tube electrode is 0.0025m 2, , 8 tubes, current density 1000A / m 2 . According to the calculation, electrolysis needs to be divided into two stages, and the electrolysis time is 1.5h and 1.3h respectively. After the second-stage electrolysis, the solid obtained by the second crystallization was dried to obtain 93.97 g of succinic acid solid, the purity of succinic acid was 98.8%, and the recovery rate of maleic acid was 74.5%. The filtrate was taken for analysis, which contained 11.06g of maleic acid, 20.54g of succinic acid, 0.401g of fumaric acid, 4.05g of formic acid, 5.77g of acetic acid, and 5.58g of propionic acid.

Embodiment 3

[0067] Take 500g of waste acid solution and heat it to 40°C, which contains 122.36g of maleic acid, 0.423g of fumaric acid, 7.13g of formic acid, 7.85g of acetic acid, and 8.21g of propionic acid. The cathode uses Pb electrode and the anode uses Sn-PbO 2 / Ti coated electrode, the area of ​​a single tube electrode is 0.0025m 2, , 8 tubes, current density 1000A / m 2 . According to the calculation, electrolysis needs to be divided into two stages, and the electrolysis time is 1.5h and 1.3h respectively. After the second-stage electrolysis, the solid obtained by the second crystallization was dried to obtain 95.78 g of succinic acid solid, the purity of succinic acid was 99.1%, and the recovery rate of maleic acid was 74.7%. The filtrate was taken for analysis, which contained 10.97g of maleic acid, 21.98g of succinic acid, 0.311g of fumaric acid, 3.05g of formic acid, 4.32g of acetic acid, and 4.13g of propionic acid.

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Abstract

The invention discloses an electrochemical treatment method of maleic anhydride acid water, wherein the electrochemical treatment method comprises the steps: converting maleic acid in waste acid water generated in the process of producing maleic anhydride by oxidizing n-butane into succinic acid in a segmented electrolysis manner under the condition of not adding other chemical agents, and proposing a calculation formula for guiding the segmentation time. Cost increase caused by excessive segmentation and reactor blockage caused by succinic acid crystallization due to non-segmentation or too few segmentation are avoided, and green treatment of the acid water is realized.

Description

(1) Technical field [0001] The invention belongs to a method for recycling organic acid water, and in particular relates to a method for recycling acid water produced in the process of preparing maleic anhydride by n-butane oxidation. [0002] (2) Technical background [0003] Maleic anhydride, also known as maleic anhydride, has the molecular formula C 4 h 2 o 3 It is an important chemical raw material and is widely used in medicine, agriculture, and industry. Catalytic oxidation of n-butane is one of the main methods for preparing maleic anhydride in industrial production. [0004] A large amount of organic acid waste water will be produced in the tail gas elution treatment of n-butane oxidation to prepare maleic anhydride, which contains 20%-40% organic acid, including formic acid, acetic acid, propionic acid, maleic acid (also called maleic acid), fumaric acid, etc. The existing technology in the industry mostly uses acid water for repeated reuse, but this method wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F9/10C02F1/461C25B3/07C02F101/34C02F103/36
CPCC02F9/00C02F1/46109C25B3/07C02F2103/36C02F1/001C02F1/008C02F1/02C02F2209/02C02F1/46104C02F2201/4612C02F2201/4615C02F2201/46105C02F2201/46155C02F2001/46138C02F2101/34
Inventor 赵峰鸣赵岚军褚有群陈赵扬
Owner ZHEJIANG UNIV OF TECH
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