Method for preparing erythritol by electrochemical method

A technology of erythritol and electrolyzer, which is applied in the field of electrochemistry, can solve the problem of low atom economy and achieve the effect of good atom economy and high atom utilization

Pending Publication Date: 2022-07-29
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a two-step reaction to obtain erythritol products. First, chemical oxidation decarboxylation is performed, and then electrochemical oxidation decarboxylation-reduction is performed. Alkaline neutralization

Method used

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  • Method for preparing erythritol by electrochemical method
  • Method for preparing erythritol by electrochemical method
  • Method for preparing erythritol by electrochemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] One-pot preparation of erythritol using meshed Ti / Pt as anode zero-pole-distance electrolyzer.

[0084] The zero-pole-distance electrolytic cell is used, and the cathode is selected as a mesh 316L stainless steel electrode, and the effective area of ​​the anode and cathode is 75cm. 2 , Nafion 427 was selected as the cation exchange membrane.

[0085] Take 100g of acetonitrile, 400mL of water and 12g of sodium bromide into the anolyte storage tank and the catholyte storage tank respectively, adjust the mass flow of 1,3-butadiene to 0.065g / min, the current to 7.5A, and the current density to 1000A / m 2 , the current efficiency is 90%, the voltage is 3.6V, and the anolyte is continuously entered into the cathode liquid storage tank with a mass flow of 0.11g / min using a peristaltic pump for alkaline hydrolysis and saponification into a ring. After the catholyte reaction solution was transferred out, the aqueous solution of 1,2,3,4-diepoxybutane was alkaline and the pH value...

Embodiment 2

[0087] Erythritol was prepared by a one-pot method in a zero-pole-distance electrolytic cell by changing the ratio of acetonitrile / water, using potassium bromide halide as electrolyte and meshed Ti / Pt as anode.

[0088] A zero-pole-distance electrolytic cell was used, and the acetonitrile / water ratio was adjusted to be 1:2, that is, 167 g of acetonitrile, 333 g of water and 10 g of potassium bromide were used as the reaction solution, Nafion 115 was selected as the cation exchange membrane, and other conditions were as in Example 1.

[0089] After 1,2,3,4-diepoxybutane is synthesized by paired electrolysis, the reaction solution undergoes acid dissociation to open the ring, freeze crystallization, and dry to obtain white crystal erythritol. The electrolysis current and current density remain unchanged, and the current The efficiency is 87%, the voltage is 4.1V, the total yield is 80%, and the electrolysis energy consumption is 5874kWh / t.

Embodiment 3

[0091] Erythritol was prepared by one-pot method using 1,3,,5-hexatriene conjugated olefin as raw material and reticulated Ti / Pt as anode zero-pole-distance electrolytic cell by changing the ratio of acetonitrile / water.

[0092] A zero-pole-distance electrolytic cell was used, and the acetonitrile / water ratio was adjusted to be 1:3, that is, 125 g of acetonitrile, 375 g of water and 11.25 g of sodium bromide were used as the reaction solution, Nafion 117 was selected as the cation exchange membrane, and other conditions were as in Example 1.

[0093] After 1,2,3,4-diepoxybutane is synthesized by paired electrolysis, the reaction solution undergoes acid dissociation to open the ring, freeze crystallization, and dry to obtain white crystal erythritol. The electrolysis current and current density remain unchanged, and the current The efficiency is 80%, the voltage is 3.8V, the total yield is 76%, and the electrolysis energy consumption is 5921kWh / t.

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Abstract

The invention provides a method for preparing erythritol by an electrochemical method. According to the method, the erythritol is prepared by taking 1, 3-butadiene as a raw material through a pairwise electrolysis one-pot method. According to the method, a zero-polar-distance electrolytic cell with a cation exchange membrane is adopted, a raw material 1, 3-butadiene is oxidized at an anode to obtain 1, 4-dibromo-2, 3-dihydroxybutane, an anolyte is reduced at a cathode to obtain 1, 2, 3, 4-diepoxybutane, the obtained catholyte is directly acidified without treatment to obtain erythritol, and pure erythritol is obtained after neutralization treatment. The method has the advantages of wide raw material source, simple steps, high atom economy, less three wastes, low energy consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for preparing erythritol by an electrochemical method. Background technique [0002] Erythritol is widely distributed in nature, such as fruits, mushrooms, lichens, etc. In addition, it also exists in fermented foods and mammals. It is a natural sugar with sweet taste, and its sweetness is 70%-80% of that of sucrose, and its calorie is only 0.2kcal / g. Erythritol is a four-carbon sugar alcohol with the molecular formula CH 4 O 4 H 10 , the chemical structure is: [0003] [0004] Erythritol has unique nutritional properties, has relatively high digestibility, and is easily absorbed by the small intestine; Erythritol does not affect blood sugar and insulin levels, so it is suitable for diabetics to eat; because bacteria in the mouth cannot use erythritol sugar alcohols, so it does not cause tooth decay. [0005] Because erythritol has the abov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/25C25B3/07
Inventor 钱向阳杜旺明李俊平张永振陈长生刘释水栾谨鑫吕娜潘亚男黎源
Owner WANHUA CHEM GRP CO LTD
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