Formaldehyde → Tricalcium Phosphate

Participants

Reaction Conditions

Reaction Steps

were initially heated with intensive stirring to 80° C. with 100 g of 30% formalin (1 mole) and 25 g of 85% phosphoric acid in a ground glass flask. The cell walls of the bacteria were thus ruptured and the plant protection agents present deactivated and hydrolyzed by reaction of the NH2 - or NH-functions thereof with formaldehyde by N-methylolation (>N--CH2 --O--CH2N>) or methylene linkage (>N--CH2 --N<). After this primary reaction, samples were taken and centrifuged. By titrating the formaldehyde in the filtrates, it was analytically determined that 0.05 mole of formaldehyde has been consumed. A solution of 60 g of urea (1 mole) in 100 g of water and 10 g of 30% formalin (0.1 mole) were then added to the reaction mixture. After condensation for 15 minutes at 70° C., the mixture was cooled over a period of 30 minutes to a temperature of 45° C. and a readily filterable, powder-form biomass mixed condensate was obtained. This biomass mixed condensate was neutralized with calcium hydroxide, as a result of which substantially insoluble calcium phosphate precipitated in very finely divided form in the biomass condensate dispersion. The powder-form product was filtered off and washed with a 2% aqueous ammonia solution. The product was then dried under reduced pressure at 70° C., giving a substantially odorless powder in an amount of 176 g. The nitrogen content amounted to 13.4%.

Provenance & Evidence