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Method and device for preparing mannitol and potassium iodate by electrolysis in pairs

A paired electrolysis and mannitol technology, which is applied in the direction of electrolysis process, electrolysis components, electrolysis organic production, etc., to achieve the effect of improving current efficiency, high yield and reducing production cost

Active Publication Date: 2007-11-28
GUANGXI RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But do not see the bibliographical report of useful paired electrolytic synthesis of potassium iodate in China

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  • Method and device for preparing mannitol and potassium iodate by electrolysis in pairs
  • Method and device for preparing mannitol and potassium iodate by electrolysis in pairs

Examples

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Effect test

example 1

[0025] Using the plate and frame electrolyzer designed by the inventor, the anode uses β-PO 2 / Ti, nickel plate for cathode, commercially available anion exchange membrane and bipolar membrane for diaphragm, both electrode and diaphragm area are 0.25dm 2 . Weigh 800 grams of distilled water, I 2 54.0 grams, KOH21.6 grams, are made into anolyte; Get 339 grams of sucrose hydrolyzate (reducing sugar concentration is 43.47%), 300 grams of Raney nickel catalysts, 12 grams of KOH also have an amount of distilled water and make about 800ml catholyte. The electrolysis temperature is about 40°C, and the current density is 3.2A / dm 2 , The electrolytic capacity is 57A·h. After the electrolysis is completed, the catholyte is filtered to separate the catalyst, and the filtrate is separated and purified to obtain 254.1 grams of mannitol; the anolyte is heated to near boiling, filtered while hot to remove insoluble matter, the solution is concentrated, cooled and crystallized, filtered to...

example 2

[0027] Using the plate and frame electrolyzer designed by the inventor, the anode uses β-PO 2 / Ti, nickel plate for cathode, commercially available anion exchange membrane and bipolar membrane for diaphragm, both electrode and diaphragm area are 0.25dm 2 . Weigh 800 grams of distilled water, I 2 54.0 grams, KOH21.6 grams, are made into anolyte; Get 339 grams of sucrose hydrolyzate (reducing sugar concentration is 43.47%), 300 grams of Raney nickel catalysts, 12 grams of KOH also have an amount of distilled water and make about 800ml catholyte. The electrolysis temperature is about 40°C, and the current density is 3.2A / dm 2 , The electrolytic capacity is 57A·h. The cathode and anode electrolyte treatment method is the same as that of Example 1, and the product is obtained at last, containing 256.1 grams of mannitol; 91.0 grams of potassium iodate, and the content is 100.1%. The total current efficiency is 169.3%.

example 3

[0029] Using the plate and frame electrolyzer designed by the inventor, the anode uses β-PO 2 / Ti, nickel plate for cathode, commercially available anion exchange membrane and bipolar membrane for diaphragm, both electrode and diaphragm area are 0.25dm 2 . Weigh 800 grams of distilled water, I 2 54.0 grams, KOH21.6 grams, are made into anolyte; Get 339 grams of sucrose hydrolyzate (reducing sugar concentration is 43.47%), 300 grams of Raney nickel catalysts, 12 grams of KOH also have an amount of distilled water and make about 800ml catholyte. The electrolysis temperature is about 30°C, and the current density is 3.0A / dm 2 , The electrolytic capacity is 57A·h. The cathode and anode electrolyte treatment method is the same as example 1, finally obtains the product, contains mannitol 245.3 grams; Potassium iodate 87.0 grams, content 100.2%. The overall current efficiency is 160.5%.

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Abstract

The invention provides the method and device to produce the mannitol and potassium iodate by electrolysis. The potassium iodate is produced by electrolyzing the I2 in anode and the mannitol is produced by electrolyzing the sucrose in cathode. The beta -PbO2 / Ti is as anode and the stainless steel, the nickel plate are as cathode. It uses the anion membrane or dipole membrane as septum; the temperature is 30-60deg.C, the current flow density is 3.0-5.0A / dm2. The anode solution is the KOH solution with I2; the cathode solution is sucrose hydrolyzing solution and Raney' s nickel catalyzer. After electrolyzing, the anode solution rime to get the potassium iodate and cathode solution include the mannitol and sorbitol; so by controlling the temperature and rime, we can get the mannitol product, the electrolysis efficiency can reach above 150%.

Description

technical field [0001] The invention relates to a method and a device for preparing hexahydric alcohols (mannitol and sorbitol) by electrolysis using sucrose as a raw material. Background technique [0002] Mannitol, also known as D-mannitol, is an isomer of sorbitol, both of which are hexavalent alcohols. Mannitol is white or colorless crystalline powder, odorless, with cool and sweet taste, the sweetness is equivalent to 70% of sucrose. Mannitol is an important fine chemical product, which can be used as medicine, pharmaceutical additives, nutritional sweeteners, plasticizing surfactants, etc. With the continuous deepening of research and development, new application fields of mannitol have been continuously developed. The application and development prospects are very broad. [0003] Potassium iodate is a white prismatic monoclinic inorganic compound, its aqueous solution is neutral and insoluble in ethanol. Potassium iodate is a very important inorganic salt, which ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/24C25B3/04C25B9/10C25B3/25C25B9/23
Inventor 韦少平莫炳辉张丽娟柯敏李致宝许朝芳翁德洪
Owner GUANGXI RES INST OF CHEM IND CO LTD
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