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Preparation method of disodium stannous citrate crystal

A technology of trisodium citrate and citric acid, which is applied in the preparation of carboxylate, organic chemistry, etc., can solve the problems of many reaction steps, difficulty in production operation, large amount of waste water, etc., and achieve simplified production steps, reduced energy consumption and operation Difficulty, quality-enhancing effects

Active Publication Date: 2010-09-29
XILONG SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With sodium hydroxide, tin protochloride is converted into stannous hydroxide, following problem: the one, reaction step is many, and the waste water amount of cleaning stannous hydroxide is bigger; The 2nd, alkaline medium makes tin protochloride or protohydroxide Tin is extremely easy to be oxidized to tetravalent tin, and the anti-oxidation treatment makes the production operation difficult

Method used

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  • Preparation method of disodium stannous citrate crystal
  • Preparation method of disodium stannous citrate crystal
  • Preparation method of disodium stannous citrate crystal

Examples

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Effect test

Embodiment 1

[0029] Dissolve 294 grams of trisodium citrate in 600 mL of pure water with stirring, filter and set aside. Weigh 451g of stannous chloride and dissolve it in 1000mL of hot water at 80°C, add 0.5g of metal tin powder, keep warm and stir for half an hour, then heat filter. Add the above clarified trisodium citrate solution into the stannous chloride filtrate under stirring at room temperature, and adjust the pH value of the reaction system to 4-5 with hydrochloric acid and / or sodium hydroxide to prepare a suspension of stannous citrate. Heat to 95°C, continue to stir and react for 0.5 hours, cool to room temperature, filter, wash with pure water to remove sodium chloride, and try to dry the water to obtain the intermediate of stannous citrate.

[0030] Add wet stannous citrate into 1000mL of 95% ethanol, stir evenly, add 192 grams of citric acid at 50°C, continue to stir and react for 1 hour, then add a solution of 160 grams of sodium hydroxide dissolved in 1500mL of 95% ethano...

Embodiment 2

[0038] Dissolve 294 grams of trisodium citrate in 600 mL of pure water with stirring, filter and set aside. Weigh 451g of stannous chloride and dissolve it in 1000mL of hot water at 80°C, add 0.5g of metal tin powder, keep warm and stir for half an hour, then heat filter. Add the above clarified stannous chloride filtrate into the trisodium citrate solution under stirring at room temperature, and adjust the pH value of the reaction system to 4-5 with sodium hydroxide and / or hydrochloric acid to obtain a suspension of stannous citrate. Heat to 95°C, continue to stir and react for 0.5 hours, cool, filter, and wash with pure water to remove sodium chloride, then try to dry the water to obtain the intermediate of stannous citrate.

[0039] Add wet stannous citrate into 1000mL of 95% ethanol, stir evenly, add 192 grams of citric acid at 50°C, continue to stir and react for 1 hour, then add a solution of 160 grams of sodium hydroxide dissolved in 1500mL of 95% ethanol to make the re...

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Abstract

The invention discloses a preparation method of disodium stannous citrate crystal. The preparation method comprises the following steps: using trisodium citrate and stannous chloride as raw materials; adding trisodium citrate aqueous solution into stannous chloride aqueous solution for reaction to obtain a distannous citrate precipitate; and reacting the distannous citrate with citric acid in an alcohol system to convent to stannous citrate, and then reacting with sodium hydroxide to obtain disodium stannous citrate crystal. In the invention, the process of preparing stannous hydroxide is omitted, and divalent tin being in a basic solution environment is avoided, thereby escaping the problem of antioxidant treatment during preparation process, further simplifying production steps, reducing energy consumption and operation difficulty, improving the quality of disodium stannous citrate product and being capable of obtaining beautiful needle-like crystal.

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 crystals. 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. Oral LD ​​in mice 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/41
Inventor 刘志平黄伟鹏庄景发章小亮李金荣赵书煌郑鹤立
Owner XILONG SCI CO LTD
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