Boron citrate is prepared by reaction of boron oxide with citric acid, and then dehydrated by centrifugation and dried to produce boron citrate, which is characterized by the following steps: 1) dehydrating boric acid at 220-260 ºC to produce boron oxide; 2) dissolving food grade citric acid with water to form citric acid aqueous solution with concentration of 40% - 50%, 3) slowly add the boron oxide prepared in step 1 to the chemical Book citric acid solution in step 2 for neutralization reaction to produce boron citrate 4) pour the boron citrate prepared in step 3 into a mixer for 25-30 min, and then put it into a centrifugal dehydrator for centrifugation dehydration 5) send the dehydrated boron citrate into a drying oven at 85-95 ºC for 90-100 min, Boron citrate was obtained.
Molecular formula: bc6h5o7.h2o appearance: white powder content (based on boron) 5.0 ~ 7.5%, heavy metal ≤ 10ppm, lead ≤ 1p chemical bookpm, arsenic ≤ 1ppm, drying weight loss (85 ° C) Less than or equal to 10% burn residue less than or equal to 0.2% total number of bacteria less than or equal to 3000 / g Figure 2 appearance of boron citrate