Preparation of a solid sodium formate preparation comprises (i) preparing an aqueous solution, which exhibits formic acid, sodium formate and water； (ii) subjecting the aqueous solution to crystallization and separating a solid phase from mother liquor； (iii) supplying the mother liquor during the production of the aqueous solution, to a distilling device； (iv) mixing the mother liquor with a sodium-containing base to form a mixture containing sodium formate and formic acid； (v) mixing the mixture with formic acid； and (vi) removing the water by withdrawing from the distilling device. Preparation of a solid sodium formate preparation with a content of at least 35 wt.% of formic acid, comprises: (i) at increased temperature, preparing an aqueous solution, which exhibits a molar ratio of formic acid and sodium formate of more than 1.5:1 and a molar ratio of formic acid and water of at least 1.1:1； (ii) subjecting the aqueous solution to crystallization and separating a solid phase from mother liquor； (iii) supplying the mother liquor, optionally after removal of a partial quantity of the mother liquor, during the production of the aqueous solution, to a distilling device； (iv) mixing the mother liquor with a sodium-containing base to form a mixture containing sodium formate and formic acid； (v) mixing the mixture with formic acid under receipt of the aqueous solution； and (vi) removing the water that is not needed for the production of the aqueous solution, by withdrawing from the distilling device.본 발명은, (i) 모액 (G)를 증류 장치 (DV)에 공급하는 단계； (ii) 증류 장치 (DV)내의 모액 (G)를 나트륨-포함 염기 (A)와 혼합하여 포름산나트륨 및 포름산을 포함하는 혼합물 (B)를 수득하는 단계； (iii) 단계 (ii)로부터 수득된 혼합물 (B)를 포름산 (D)와 혼합하여 수용액 (E)를 수득하는 단계； 및 (iv) 과량의 물 (C)를 단지 증류 장치 (DV)로부터의 인출에 의해 본질적으로 방출시키는 단계에 의해, 승온에서, 포름산나트륨 및 포름산을 1.5:1 초과의 HCOOH:HCOONa의 몰비로 포함하며, HCOOH:H2O의 몰비가 1.1:1 이상인 수용액 (E)를 제조하고, 수용액 (E)를 결정화시켜 고체상 (F) 및 모액 (G)를 수득하고, 고체상 (F)를 모액 (G)로부터 분리하는, 이포름산나트륨 제제의 총 중량을 기준으로 35 중량% 이상의 포름산 함량을 갖는 고체 이포름산나트륨 제제의 제조 방법, 또한 본
