Method for preparing disodium stannous citrate
A technology of disodium stannous citrate and trisodium citrate, which is applied in the field of preparation of food additives, can solve the problems of large amount of waste water, many reaction steps, difficulty in production operation, etc., to improve quality, simplify production steps, and reduce energy consumption. The effect of consumption and difficulty of operation
Active Publication Date: 2012-11-21
XILONG SCI CO LTD
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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
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Embodiment 1
[0025] 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, adjust the pH value of the reaction system to 2 to 4 with hydrochloric acid and / or aqueous sodium hydroxide solution, and obtain a suspension of stannous citrate . Add a solution of 84 grams of sodium bicarbonate dissolved in 1700 mL of pure water, continue to stir and react for 0.5 hours, filter after cooling to room temperature, wash with pure water to remove sodium chloride, and dry the water as much as possible to obtain the intermediate of stannous citrate . Then react with a solution of 294 grams of trisodium citrate dissolved in 600 mL of pure water until all the solids are disso...
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Abstract
The invention discloses a method for preparing disodium stannous citrate, comprising the following steps: respectively dissolving trisodium citrate and stannous chloride which are used as the raw materials in water; adding the aqueous solution of the trisodium citrate to the aqueous solution of the stannous chloride to make the aqueous solution of the trisodium citrate react with the aqueous solution of the stannous chloride so as to obtain the solid product of reaction of stannous citrate; adding and stirring the stannous citrate to the aqueous solution of the trisodium citrate so as to makethe stannous citrate react with the aqueous solution of the trisodium citrate and dissolve in the aqueous solution of the trisodium citrate; adding the aqueous solution of the sodium hydrogen carbonate to obtain the solution of the disodium stannous citrate; and concentrating, drying and grinding the solution of the disodium stannous citrate to obtain the solid powder of the disodium stannous citrate. The method for preparing the disodium stannous citrate omits the step of preparing stannous hydroxide and prevents bivalent tin from being in the alkaline solution environment by controlling thepH value of the reaction system below 5.0 before precipitating the stannous citrate, thereby avoiding the problem on the antioxidant treatment in the process of preparing the disodium stannous citrate and improving the quality of the product of disodium stannous 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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IPC IPC(8): C07C59/265C07C51/41
CPCC07C51/412
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