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A method for preparing vitamin A palmitate by electrochemical method

A palmitate and vitamin technology, applied in electrolytic organic production, electrodes, electrolytic components, etc., can solve the problems of electrode materials such as difficulty in ionizing hydrogen protons, small specific surface area, poor electrical conductivity, etc., and achieve good chemical stability, large ratio Surface area, the effect of increasing the speed

Active Publication Date: 2022-04-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of electrocatalyzed esterification or transesterification, because the electrolyte is a weak acid environment, the electrode material has disadvantages such as difficulty in ionizing hydrogen protons, small specific surface area, poor conductivity, weak stability, etc. The reaction is widely promoted in the form of electrocatalysis, so the preparation of an electrode material or process suitable for esterification reaction or transesterification reaction system has broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Put 20g of carbon fiber rods in 2L, 0.5mol / L cobalt nitrate aqueous solution, pass a sufficient amount of hydrogen sulfide gas into the solution under strong stirring, control the time of gas introduction, and let the metal salt react with the gas for 1h Finally, the obtained carbon fiber rods adsorbing the precipitates were taken out, dried and then sealed with nitrogen for use.

[0031] (2) Prepare 500mL, 0.5mol / L lead nitrate aqueous solution, then add 0.5mol sodium fluoride into it, stir evenly, dissolve completely, add in the electrolytic cell, at 20 ℃, use the above-mentioned dried solid as Electrode anode, graphite carbon rod as cathode, at 5mA / cm 2 , and electrodeposited for 2h to prepare PbO 2 @C@Co 2 S 3 Electrode, its specific surface area is 200.5m according to BET analysis 2 / g. The prepared electrode was placed in a methanol solution of palmitic acid and left to stand for 24 hours, and the mass change before and after weighing was measured. The me...

Embodiment 2

[0034] (1) Put 20g of carbon fiber rods in 4.0L, 2.5mol / L cobalt nitrate aqueous solution, pass a sufficient amount of hydrogen sulfide gas into the solution under strong stirring, control the time of gas introduction, and let the metal salt react with the gas After 5 hours, the obtained carbon fiber rods adsorbing the precipitates were taken out, dried and then blanketed with nitrogen for use.

[0035] (2) Prepare 400mL, 2.5mol / L lead nitrate aqueous solution, then add 0.2mol sodium fluoride to it, stir evenly, dissolve completely, and add to the electrolytic cell. At 40°C, the above-mentioned dried solid was used as the anode of the electrode, and the graphite carbon rod was used as the cathode, at 30mA / cm 2 , and electrodeposited for 6h to prepare PbO 2 @C@Co 2 S 3 The electrode, analyzed by BET, has a specific surface area of ​​240.7m 2 / g. The prepared electrode was placed in a methanol solution of palmitic acid and left to stand for 24 hours, and the mass change bef...

Embodiment 3

[0038] (1) Put 20g of carbon fiber rod in 2L, 0.5mol / L nickel nitrate aqueous solution, pass a sufficient amount of hydrogen sulfide gas into the solution under strong stirring, control the time of gas introduction, let the metal salt react with the gas for 1h Finally, the obtained carbon fiber rods adsorbing the precipitates were taken out, dried and then sealed with nitrogen for use.

[0039] (2) Prepare 500 mL, 0.5 mol / L lead nitrate aqueous solution, then add 0.5 mol sodium fluoride to it, stir evenly, dissolve completely, and add to the electrolytic cell. At 20°C, the above-mentioned dried solid was used as the anode of the electrode, and the graphite carbon rod was used as the cathode, at 5mA / cm 2 , and electrodeposited for 2h to prepare PbO 2 @C@NiS electrode, its specific surface area is 189.5m according to BET analysis 2 / g. The prepared electrode was placed in a methanol solution of palmitic acid and left to stand for 24 hours, and the mass change before and after...

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Abstract

The object of the present invention is to provide a kind of method that electrochemical method prepares vitamin A palmitate, with the carbon nanorod of load metal oxide and metal sulfide as anode, with Pt / C material as cathode, in electrolytic cell Catalyze the electrolysis of vitamin A alcohol and palmitic acid at a certain temperature to obtain vitamin A palmitate; the rate of esterification reaction is improved, and the obtained vitamin A palmitate is easy to crystallize, the esterification reaction has extremely high all-trans selectivity, and the process is simple , the raw material cost is extremely low, and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to an electrochemical method for preparing vitamin A palmitate. Background technique [0002] Vitamin A palmitate (vitamin A palmitate) is one of the main series of vitamin A products. Vitamin A is an indispensable substance for the normal metabolism of humans and animals. It has been widely used in cosmetics, medicines, feeds, etc. [0003] At present, the main synthesis routes of commonly used vitamin A palmitate are chemical synthesis and biological enzymatic methods. The chemical synthesis method mainly uses vitamin A alcohol and methyl palmitate as raw materials, and uses solid bases such as potassium oxide and solid acids such as S 2 o 8 2- / SnO 2 1. Protonic acids such as sulfuric acid, hydrochloric acid, etc. are used as catalysts to carry out transesterification catalytic reactions. The process is relatively complicated, the reaction conditions ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/07C25B3/20C25B11/054C25B11/091
CPCC25B3/00
Inventor 罗朝辉林龙张涛吕英东
Owner WANHUA CHEM GRP CO LTD