Preparation of fatty acid calcium for the feed additive

Using tallow as material,an protocol for preparation of fatty acid calcium was described.The white powder fatty acid calcium was produced by saponification and metathesis reaction.After a single-factor experiment,the optimum reaction condition was confirmed as follows:m tallow∶m NaOH∶m CaCl2=1∶0.4∶0.3,reaction temperature 85 ℃,time of saponification 3 h,time of metathesis reaction 2 h.The absorption peaks of infrared spectra in 2919、2852 cm-1 were attributable to methyl、methylene of aliphatic chain,the absorption peaks in 1 577~1 540 cm-1 was attributable to carboxylate anion.Chemical analysis showed that the content of Ca2+ in fatty acid calcium was 6.14 %.