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Distannous citrate preparation method

A technology of disodium stannous citrate and trisodium citrate, which is applied in the field of preparation of food additives, can solve problems such as difficult crystallization of disodium stannous citrate, difficulty in meeting requirements for water-insoluble substances, and high energy consumption for water evaporation. Achieve beautiful appearance, reduce energy consumption, and avoid production operations

Active Publication Date: 2007-07-11
XILONG SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can solve the problem of high chloride ions in the product, because disodium stannous citrate is difficult to crystallize, the concentration of disodium stannous citrate solution must be completely dry to take out block solids, and can only be obtained after crushing. Amorphous powder is obtained, the product is very sticky to the wall during the drying process, it is difficult to take out the product, and the evaporation of a large amount of water consumes a lot of energy
The method mentioned in the "Food Additive Handbook" is usually difficult to meet the requirements of Chinese enterprise standards due to the process of concentration and oxidation.

Method used

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Examples

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Embodiment 1

[0036] Dissolve 160 grams of sodium hydroxide in 500 mL of pure water under stirring, filter and set aside. Weigh 450 grams of stannous chloride and dissolve it in 250 grams of hot water at 80°C, add 0.5 grams of metal tin powder, keep warm and stir for half an hour, then heat filter. Add the clarified sodium hydroxide solution into the stannous chloride filtrate under stirring at 50°C until the pH value of the system is 9 to obtain a stannous hydroxide suspension. Add a solution of 210 grams of citric acid dissolved in 150 grams of pure water at 50°C, continue to stir and react for 1 hour after the addition, cool to room temperature, centrifugally filter and wash to remove sodium chloride, then centrifuge and dry the water as much as possible to obtain Lemon Distannous acid intermediate. Add wet stannous citrate into 1000mL of 95% ethanol, stir evenly, add 210g of citric acid at 50°C, continue stirring for 1 hour, then add 160g of sodium hydroxide dissolved in 1500mL of 95% ...

Embodiment 2

[0044] Dissolve 240 grams of sodium hydroxide in 750 mL of pure water under stirring, filter and set aside. Weigh 677 grams of stannous chloride and dissolve it in 380 grams of hot water at 80° C., add 0.8 grams of metal tin powder, keep stirring for half an hour, and then heat filter. Add the clarified sodium hydroxide solution into the stannous chloride filtrate under stirring at 50°C until the pH value of the system is 9 to obtain a stannous hydroxide suspension. Add a solution of 210 grams of citric acid dissolved in 150 grams of pure water at 50°C. After the addition, continue to stir and react for 1 hour, cool to room temperature, and centrifugally filter and wash to remove sodium chloride. The particle size of the stannous suspension is extremely small, and part of the unconverted tin hydroxide is also filtered out during the filtration, and the obtained solid is vacuum-dried at 55° C. to obtain 570-580 grams of a white solid product, which is crushed for later use. An...

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Abstract

The invention discloses a making method of tin disodium citrate, which comprises the following steps: making ditin citrate sediment in the water dielectric; reacting ditin citrate and citrate in the alcohol to form tin citrate; reacting with sodium hydroxide to form the sediment of tin disodium citrate; filtering; drying to obtain loose white powder of tin disodium citrate or the composition of tritin citrate and trisodium citrate; dissolving the composition to obtain the disodium citrate.

Description

technical field [0001] The invention relates to a preparation method of a food additive, in particular to a preparation method of disodium stannous citrate. Background technique [0002] Disodium stannous citrate, also known as disodium stannous citrate, sodium stannous citrate, 8301 color protectant, molecular formula C 6 h 6 o 8 SnNa 2 , the molecular weight is 370.79, and the structural formula is as follows: [0003] [0004] Disodium stannous citrate is a white powdery solid, easily soluble in water, easy to absorb moisture and deliquescence, and easy to oxidize. The melting point is 250°C (decomposition), it starts to turn yellow at 260°C, and turns brown at 283°C. LD 50 It is 2700mg / Kg, and the shock-induced and teratogenic tests are negative, belonging to slightly toxic chemicals. This product has strong reducibility, and is used as an antioxidant, preservative and color-protecting agent in food additives. According to the "Hygienic Standards for the Use o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/245C07C51/41A23L3/3508
Inventor 黄伟鹏刘志平庄景发赵书煌肖克强牛友斌
Owner XILONG SCI CO LTD
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