Process for preparing Bismuth citrate from Bismuth oxide

Process for preparing Bismuth citrate from Bismuth oxide

The method includes the following steps:

Step 1, pulverizing Bismuth oxide to a prescribed average particle diameter;

Step 2, preparing a predetermined concentration of aqueous citric acid solution and heating to a predetermined temperature lower than the boiling point of water;

Step 3,according to the chemical reaction equation Bi2O3+2C6H8O7=2C6H5BiO7+3H2O, the initial excess coefficient of citric acid in the aqueous citric acid solution is kept below 1, and the pulverized Bismuth oxide is gradually added to the heated aqueous citric acid solution, so that Citric acid reacts with Bismuth oxide;

Step 4, as the reaction proceeds, gradually add another concentration of aqueous citric acid solution to maintain the initial liquid to solid ratio;

Step 5. After the reaction is completed, filter and dry.

In the second step, the predetermined concentration of the aqueous citric acid solution is 200-500 g/L; in the fourth step, the concentration of the additional concentrated aqueous citric acid solution is 50-200 g/L; in the fourth step, stepwise An additional aqueous solution of citric acid was added to measure the viscosity of the aqueous citric acid solution before the addition in real time.

Product recommendation : Bismuth

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