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Method for salicylic acid electrolysis for preparing salicyic aldehyde

A technology of salicylic acid and salicylaldehyde, applied in the electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problems of low product purity, complex catholyte composition, low current efficiency and conversion rate of electrolytic reduction method, etc.

Inactive Publication Date: 2007-08-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The chemical reduction method has low yield, low product purity, and is difficult to separate and pollutes a lot, so it is rarely used nowadays
However, the current efficiency and conversion rate of the electrolytic reduction method are not high, and the composition of the catholyte is complex.

Method used

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  • Method for salicylic acid electrolysis for preparing salicyic aldehyde
  • Method for salicylic acid electrolysis for preparing salicyic aldehyde
  • Method for salicylic acid electrolysis for preparing salicyic aldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] All percentages in the examples are percentages by mass.

[0039] Use flat lead as the cathode and anode, and the area of ​​the lead cathode is 15cm 2 (2.5×6cm). An ion exchange membrane is used as the diaphragm. When the electrolysis started, the anolyte was 250ml concentration of 15% sulfuric acid solution, and the catholyte was 220ml concentration of 20% sodium bisulfite solution and 5.0 grams of salicylic acid. Stir the catholyte with a magnetic stirrer. The applied current is 1.5A, and the current density is 1000A / m 2 . The catholyte temperature was 20±2°C. The actual power-on time is 1 hour and 30 minutes. The results of electrolysis are as follows:

[0040] Cell voltage (V)

Embodiment 2

[0042] Electrode, anolyte, current density, electrolysis temperature, electrolysis time and diaphragm are the same as Comparative Example 3. Catholyte is 220ml concentration and is the tetrapentylammonium bromide solution of 20% sodium bisulfite solution and 5.0 grams of salicylic acid and 10ml0.5g / L. The results of electrolysis are as follows:

[0043] Cell voltage (V)

Embodiment 3

[0045] Electrode, anolyte, current density, electrolysis temperature, electrolysis time and diaphragm are the same as Comparative Example 3. Catholyte was 20% sodium bisulfite solution and 5.0 gram salicylic acid and 5ml concentration was the tetramethylammonium hydroxide solution of 0.5g / L when electrolysis started. The results of electrolysis are as follows:

[0046] Cell voltage (V)

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Abstract

The invention relates to a direct electro-reduction method for preparing ortho-hydroxybenzaldehyde with 2-hydroxybenzoic acid in H type electrolyser, which is characterized in that quaternary ammonium salt addictive is added in cat electrode room. It takes lead plate as cathode and anode, takes ortho-hydroxybenzaldehyde and hydric sulphate as electrolytic solution for cathode and anode, the current efficiency reach over 35% at 10- 40 Deg. C and current density of 500- 2000 A / m2, which is 10% more than that without addictive.

Description

technical field [0001] The invention relates to a preparation method of salicylaldehyde, in particular to a method for preparing salicylaldehyde by electrolytic reduction of salicylic acid. Background technique [0002] Salicylaldehyde (Salicylic aldehyde), the scientific name is o-hydroxybenzaldehyde, the molecular formula is C 7 h 6 o 2 , is a fine chemical product with a wide range of uses, and is widely used in the production of pesticides, medicines, and integrants. It is an important raw material in the production of synthetic perfume industry, it can be used as an antioxidant in the plastic resin industry, and it is also a raw material in petrochemical and other industries. At present, the production of salicylaldehyde mainly includes catalytic oxidation and electrolytic reduction. Among them, the catalytic oxidation method is to use salicyl alcohol as raw material to prepare salicylaldehyde through catalytic oxidation, such as CN1045095 and BG25435; the report on...

Claims

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Application Information

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IPC IPC(8): C25B3/04C07C47/565C25B3/25
Inventor 张新胜张娴玲
Owner EAST CHINA UNIV OF SCI & TECH
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