Application Examples of Rubidium Dihydrogen Phosphate_Industrial Additives

Background and overview^[1]

Rubidium dihydrogen phosphate can be used as an acid binding agent to prepare bisfluorosulfonyl imide salt. Bisfluorosulfonimide salts, especially bisfluorosulfonimide lithium salts, have a large anion structure and strong electroabsorption of fluoride ions, which makes their binding force with cations very weak, making them in the molten state or in organic Lithium ions are highly dissociated in the presence of solvents and can be used as lithium electrolytes in lithium secondary batteries; at the same time, due to their excellent conductivity, they can be used in supercapacitors and aluminum electrolytic capacitors; they can also be used as Lewis acid catalysts. It has important industrial production value.

Apply^[1]

A method for preparing a bisfluorosulfonimide salt. The molecular formula of the bisfluorosulfonimide salt is MN(SO₂F) ₂, the M=Li, Na, K, Rb or Cs, the steps of the preparation method are as follows:

(1) Mix FSO₂X, nitrogen source, acid binding agent and aprotic solvent to obtain a mixture;

Wherein, X in the FSO₂X is fluorine (F), chlorine (Cl), bromine (Br) or iodine (I), so FSO₂X is F₂SO₂, FSO₂Cl, FSO₂Br or FSO₂I; The nitrogen source is ammonium salt or anhydrous NH₃. When the nitrogen source is anhydrous NH₃, the mixture needs to be cooled to -34℃~- 100℃; acid binding agent is lithium salt, sodium salt, potassium salt, rubidium salt or cesium salt; NH₃ or ammonium solid saturated polyester resin radical ion and FSO₂ The molar ratio of

(2) Heat the mixture to reflux and react, and continue the reaction for 5h to 80h;

When the nitrogen source is anhydrous NH₃, the acid binding agent is M₂CO₃, M=Li, Na, K, When Rb or Cs, the chemical reaction equation is as follows:

NH₃+2FSO₂X+3M₂CO₃→MN(SO₂ F)₂+3MHCO₃+2MX

When the nitrogen source is ammonium salt, taking ammonium chloride as an example, the acid binding agent is M₂CO₃, M=Li, Na, K, Rb or When Cs, the chemical reaction equation is as follows:

NH₄Cl+2FSO₂X+2M₂CO₃→MN(SO ₂F)₂+2MX+MCl+2H₂O+2CO₂

(3) After the reflux reaction is completed, cool and filter the reaction product to obtain the filtrate;

(4) Remove the solvent from the filtrate obtained in step (3) to obtain a crude product, which is dried under vacuum to obtain the bisfluorosulfonimide salt.

In step (1): Preferably, the acid binding agent is lithium carbonate, lithium bicarbonate, lithium phosphate, lithium hydrogen phosphate, lithium dihydrogen phosphate, lithium acetate, sodium carbonate, sodium bicarbonate, sodium phosphate, hydrogen phosphate Sodium, sodium dihydrogen phosphate, sodium acetate, potassium carbonate, potassium bicarbonate, potassium phosphate, potassium hydrogen phosphate, potassium dihydrogen phosphate, potassium acetate, rubidium carbonate, rubidium bicarbonate, rubidium phosphate, rubidium hydrogen phosphate, rubidium dihydrogen phosphate , at least one of rubidium acetate, cesium carbonate, cesium bicarbonate, cesium phosphate, cesium hydrogen phosphate, cesium dihydrogen phosphate or cesium acetate.