Patent ID: 7612233

Claim:
A process for producing a solid sodium diformate preparation having a formic acid content of at least 35% by weight, based on the total weight of the sodium diformate preparation, wherein an aqueous solution is produced at an elevated temperature from sodium formate and at least 74% strength by weight formic acid, the aqueous solution having a molar ratio of HCOOH:HCOONa of greater than 1.5:1 and a molar ratio of HCOOH:H 2 O of at least 1.1:1, the aqueous solution is brought to crystallization, and the solid sodium diformate preparation is separated off from the mother liquor, (i) a subquantity (A) of the mother liquor being recirculated for the production of the aqueous solution and (ii) a subquantity (B) of the mother liquor being admixed with a sodium-containing base and the resultant mixture comprising sodium formate, if appropriate after ejecting a part of same, and if appropriate alter concentrating same, likewise being recirculated for the production of the aqueous solution; and the subquantities (A) and (B) of the mother liquor totaling 100% by weight of the mother liquor.