Calcium formate is slightly hygroscopic and slightly bitter. Neutral, nontoxic, soluble in water. The aqueous solution is neutral. The solubility of calcium formate has little change with the increase of temperature, and it is 16g/ 100g water at 0℃ and 18.4g/ 100g water at 0℃. Specific gravity: 2.023(20℃), bulk density 900- 1000 g/L, thermal decomposition temperature >; 400℃。
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In architecture, it is used as an accelerator, lubricant and early strength agent for cement. Used in building mortar and all kinds of concrete to speed up the hardening speed of cement and shorten the setting time, especially in winter construction, to avoid too slow setting speed at low temperature. Quick demoulding, so that cement can be put into use as soon as possible. ?
Calcium formate is produced by neutralization of formic acid and hydrated lime, and commercial calcium formate is obtained by refining calcium formate. Under the action of catalyst, sodium formate and calcium nitrate undergo a double decomposition reaction to obtain calcium formate and co-produce sodium nitrate. Commercial calcium formate is obtained by refining.
In the production of pentaerythritol, calcium hydroxide is used to provide alkaline reaction conditions. In the subsequent reaction, formic acid and calcium hydroxide are added to neutralize the process, and calcium formate is a by-product.
Anhydrous formic acid can be obtained by mixing formic acid with phosphorus pentoxide and distilling under reduced pressure for 5- 10 times, but the yield is low, which takes a long time and will cause partial decomposition. Distilling formic acid and boric acid is simple and effective. Boric acid is dehydrated at high temperature in Shanghai until bubbles are no longer generated. The obtained melt is poured on the first iron sheet, cooled in the dryer, and then ground into powder.
Adding the fine powder of phenol borate into formic acid, standing for a few days to form a hard lump, separating the clear liquid, carrying out vacuum distillation, and collecting the fraction of 22-25 DEG C/12-18 mm as the product. Distillers should be completely grounded and protected by dry pipes.
Store in a cool and ventilated warehouse. Stay away from fire and heat sources. The temperature of the storage tank shall not exceed 30℃ and the relative humidity shall not exceed 85%. Keep the container sealed. Should be stored separately from oxidant, alkali and active metal powder, and should not be mixed. Equipped with corresponding varieties and quantities of fire fighting equipment. The storage area should be equipped with emergency response equipment for leakage and suitable accommodation materials.
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