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Method for production of succinic acid and sulfuric acid by paired electrosynthesis

a technology of paired electrosynthesis and succinic acid, which is applied in the direction of electrolytic organic production, electrolytic organic reduction, electrolytic components, etc., can solve the problems of high requirement for operation and use of expensive catalysts, low yield, and low purity of products, so as to reduce cell voltage and the cost of production , the effect of high current efficiency

Inactive Publication Date: 2013-05-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention describes a way to make succinic acid and sulfuric acid using a pair of electrodes. This method reduces the energy needed and the cost of production while also making the process more efficient. Additionally, this method solves problems associated with the use of traditional anodes that have a short lifespan and can cause environmental pollution. The electrolyte used in this process can also be recycled, further reducing the environmental impact.

Problems solved by technology

Although those technologies have been developed and applied practically, there are still many problems existing such as the uncontrollable side reactions, low yield, low purity of the product, high requirement in operation and usage of expensive catalyst, etc.
Furthermore, there is serious environmental pollution in its production process.
However, a large amount of research still needs to be investigated and completed, such as low extraction efficiency, low production and conversion rate, high production cost, generation of a large amount of wastewater, etc.
Therefore, it is hard to meet the requirement of industrial production.
At present, the biological conversion technology is still limited to the laboratory scale and needs much more time to be commercialized.
However, the disadvantage in this method is that the cell voltage is high, the life of PbO2 anode is short and the initial investment of the anode is high.

Method used

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  • Method for production of succinic acid and sulfuric acid by paired electrosynthesis
  • Method for production of succinic acid and sulfuric acid by paired electrosynthesis
  • Method for production of succinic acid and sulfuric acid by paired electrosynthesis

Examples

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Effect test

example 1

[0032]A mono-polar membrane-separated electrochemical cell is used. Graphite and lead are used as anode and cathode, respectively. The apparent area of both the anode and the cathode is 50 cm2. The distance between the anode and the cathode is 40 mm. A homogeneous cation exchange membrane made of polyvinylidene fluoride (F101 type) is used in the cell.

[0033]The electrolytic technological parameters are chosen as follows: the initial concentration of KI and sulfuric acid in the anodic compartment is 1 mol / L, the initial concentration of sulfuric acid and maleic anhydride in the cathodic compartment is 1 mol / L, the temperature of the electrolyte is controlled at the range of 30˜35° C. The electrolyte in the anolyte and cathodic compartments is circulated through pump set on their respective tank. The total amount of anolyte and catholyte is 3 liters, respectively. SO2 gas is fed into the anodic compartment. Slight excess of SO2 gas is kept to ensure that the solution in the anodic com...

example 2

[0035]A mono-polar membrane-separated electrochemical cell is used. Graphite and lead are used as anode and cathode, respectively. The apparent area of both the anode and the cathode is 50 cm2. The distance between the anode and the cathode is 40 mm. A homogeneous cation exchange membrane made of polyvinylidene fluoride (F101 type) is used in the cell.

[0036]The electrolytic technological parameters are chosen as follows: the anolyte in the anodic compartment is the anolyte after electrolysis reaction in Example 1, the catholyte in the cathodic compartment is the mother liquor of the catholyte in Example 1. The initial concentration of maleic acid in the catholyte is adjusted to be 1 mol / L by supplementing maleic anhydride. The temperature of the electrolyte is controlled at the range of 50˜55° C. Other technological parameters are the same as those in Example 1. The average cell voltage is 2.26 V.

[0037]After 5 hours at constant current density, the electrolysis reaction is stopped, ...

example 3

[0038]A mono-polar membrane-separated electrochemical cell is used. DSA and lead are used as anode and cathode, respectively. The apparent area of both the anode and the cathode is 50 cm2. The distance between the anode and the cathode is 20 mm. A homogeneous cation exchange membrane made of Nafion 117 is used in the cell.

[0039]The electrolytic technological parameters are chosen as follows: the anolyte in the anodic compartment is the anolyte after electrolysis reaction in Example 2, the catholyte in the cathodic compartment is the mother liquor of the catholyte in Example 2. The initial concentration of maleic acid in the catholyte is adjusted to be 1.2 mol / L by supplementing maleic anhydride. The temperature of the electrolyte is controlled at the range of 30˜35° C. SO2 gas is fed into the anolyte tank. Other technological parameters are the same as those in Example 1. The average cell voltage is 1.38 V.

[0040]After 10 hours at constant current density, the electrolysis reaction i...

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Abstract

A method for the production of succinic acid and sulfuric acid by paired electrolytic synthesis is disclosed in the present invention. The method is described as following: in cathodic compartment of an electrochemical cell separated with cation exchange membrane, maleic acid or maleic anhydride is used as raw material, sulfuric acid as the cathodic reactant and the supporting electrolyte of the reaction system, succinic acid is thus synthesized by the electro-reduction reaction at cathode. In anodic compartment, the aqueous sulfuric acid solution containing iodide ion is used as electrolyte, iodide ion is anodized to form I2 and I3−. SO2 gas is fed into the circulated anolyte, reacting with I2 and I3− to form sulfuric acid and regenerate iodide ion. Simultaneously the evaporated hydroiodic acid and distilled water are returned to the anolyte circulation system. The cell voltage and the cost of production are reduced significantly.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Patent Application No. PCT / CN2011 / 072346, with an international filing date of Mar. 31, 2011, designating the United States, now pending, and further claims priority benefits to Chinese Patent Application No. 201010137720.4, filed Apr. 1, 2010. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a method for production of succinic acid and sulfuric acid by paired electrosynthesis.[0004]2. Description of the Related Art[0005]Succinic acid is an important chemical raw material which is colorless or white crystalline, odorless and sour taste. It is widely used in the fields of pharmaceuticals, pesticides, fine chemicals and alkyd resin. In recent years, succinic acid has been widely used in the fields of biodegradable...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25B3/04C25B3/25
CPCC25B3/04C25B3/25
Inventor GAO, YUNFANG
Owner ZHEJIANG UNIV OF TECH