Preparation method for bismuth subsalicylate
A technology of bismuth subsalicylate and salicylic acid, which is applied in the field of preparation of bismuth compounds, can solve the problems of being unsuitable for industrial production, harsh conditions for ultra-fine metal bismuth, and easy oxidation of ultra-fine bismuth, so as to achieve less impurities and easy Industrialized production, high yield effect
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[0013] The preparation method of bismuth subsalicylate according to the present invention comprises the steps of: pulverizing bismuth oxide to a specified average particle size; according to the chemical reaction equation Bi 2 o 3 +2C 7 h 6 o 3 = 2C 7 h 5 BiO 4 +H 2 O makes the initial excess coefficient of the salicylic acid of salicylic acid aqueous solution be 0.05~0.3, prepare salicylic acid according to the quality and initial excess coefficient of the bismuth oxide that will adopt pulverization; Add the bismuth oxide of pulverization gradually to be heated to predetermined temperature In the aqueous solution of salicylic acid, the salicylic acid is reacted with bismuth oxide under the conditions of maintaining a predetermined temperature and avoiding light; after the reaction is completed, filter, wash and dry to obtain a bismuth subsalicylate product.
[0014] In the method for preparing bismuth subsalicylate according to the present invention, preferably, the sp...
Embodiment 1
[0023] The bismuth oxide is pulverized to an average particle size of 0.2 μm, and the pulverization adopts an experimental airflow pulverizer produced by Shanghai Saishan Powder Machinery Manufacturing Co., Ltd.;
[0024] Control the initial excess coefficient of salicylic acid to 0.05, weigh 75g of pulverized bismuth oxide particles, add salicylic acid into water, and heat to 80°C.
[0025] Weigh the bismuth oxide particles and gradually add them to the salicylic acid aqueous solution, keep away from light and stir for 1 hour, and increase the stirring speed as the reaction progresses;
[0026] After the reaction finishes, filter and wash the product bismuth subsalicylate with ultrapure water, then use excessive salicylic acid in the absolute ethanol washing product;
[0027] Dry the filter cake in a vacuum oven at 60°C to obtain a white powder product.
[0028] The obtained product was detected and analyzed by EDTA coordination titration, and the content of bismuth in the d...
Embodiment 2
[0030] The bismuth oxide is pulverized to an average particle size of 0.35 μm, and the pulverization adopts an experimental jet pulverizer produced by Shanghai Saishan Powder Machinery Manufacturing Co., Ltd.;
[0031] Control the initial excess coefficient of salicylic acid to 0.1, weigh 75g of pulverized bismuth oxide particles, add salicylic acid into water, and heat to 80°C;
[0032] The bismuth oxide particles weighed will be gradually added to the salicylic acid aqueous solution, and the light-proof airtight stirring reaction will be carried out for 1.5 hours, and the stirring speed will be accelerated as the reaction proceeds;
[0033] After the reaction finishes, filter and wash the product bismuth subsalicylate with ultrapure water, then use excessive salicylic acid in the absolute ethanol washing product;
[0034] Dry the filter cake in a vacuum oven at 50°C to obtain a white powder product.
[0035] The obtained product was detected and analyzed by EDTA coordinatio...
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