| 摘要 |
1. Method for manufacture of products containing disalts of formic acid, comprising mixing K-, Na-, Cs- or NH4-formate, K-, Na- or Cs-hydroxide, K-, Na- or Cs-carbonate or bicarbonate or NH3 with formic acid containing 0-50 % water in a reactor at 40-100 degree C characterised in that the reaction is run till approximately 50-55 % of the acid is consumed, the mixture is cooled and the slurry formed is filtered, the filtrate is collected or recirculated and the filter cake containing disalts is transported to a drier/ mixer where the disalts are dried. 2. Method according to Claim 1characterized in that optionally other disalts, calcium/ magnesium salts and can be added to the drier/mixer. 3. Method according to Claim 1, characterised in that a 80-95 % aqueous solution of formic acid is reacted with a solution of 70-80 % potassium or sodium formate at 50-60 degree C in a first reactor and subsequently cooled to 20-25 degree C, whereby the formed diformate precipitates, and that the slurry containing the diformate is separated and the filtrate is transferred to a second reactor where it is reacted with a 50 % solution of NaOH or KOH, which optionally may be mixed with the corresponding alkali carbonate, and that the thus formed formate solution is adjusted to pH 9-10 and then evaporated to a 70-80 % solution being transferred to said first reactor, and that the separated diformate solids are dried by means of air to a water content of 0.2 % in a drier. 4. Method according to Claim 1, characterised in that mole-ratio of K-, Cs-, Na- or NH4-carboxylate and formic acid is 1-1.5 : 1-1.5 and that the filtration is performed by means of a centrifuge. 5. Method according to Claim 1, characterised in that the temperature in the reactor is between 50-70 degree C and the concentration of the acid is between 50-100 %. 6. Method according to Claim 1, characterised in that K/Na-carbonates/hydroxides are solid and the water content is between 1-15%. 7. Method according to Claim 1, characterised in that liquid and/or gaseous MH3 or ammonium formate is mixed with a formic acid. 8. Method according to Claim 1, characterised in that the crystal masses of Na- and K-disalts are dried at temperatures between 40 and 80 degree C, preferably between 50 and 70 degree C. 9. Dry, freely-running and stable products comprising disalts of formic acid, characterised in that the general composition of the products is: 20-60 % potassium disalt; 20-50 % sodium di/tetra salt; 0-25 % calcium mono salt; 0-4 % desiccant; 0-5 % water. 10. Dry, freely-running and stable products comprising disalts of formic acid, characterised in that the general composition of the products is: 60-98 % +- 1% potassium disalt; 0-28 % calcium mono salt; 1.5 +- 0.7 % desiccant; 0-5 % +- 0.3% water. |
