96results about "Tretrafluoboric acid" patented technology

This method for producing a lithium tetrafluoroborate solution for lithium battery electrolyte solutions comprises: a reaction step wherein lithium fluoride and boron trifluoride are reacted with each other in a chain carbonic acid ester that serves as a solvent, thereby producing lithium tetrafluoroborate and obtaining a reaction solution that is obtained by dissolving the lithium tetrafluoroborate in the solvent; a water removal step wherein a water remover is added into the reaction solution; an acidic impurity removal step wherein acidic impurities are removed by concentrating the reaction solution after the water removal step; and a dilution step wherein the concentrated solution after the acidic impurity removal step is diluted. This production method is capable of providing a method for producing a lithium tetrafluoroborate solution for lithium battery electrolyte solutions, said lithium tetrafluoroborate solution having an acidic impurity concentration reduced to 50 ppm by mass or less and a water concentration reduced to 15 ppm by mass or less.

The invention relates to the field of chemical synthesis, in particular to a preparation method of two kinds of fluorine-containing lithium salts (lithium difluorophosphate and lithium tetrafluoroborate). The invention provides a combined preparation method of lithium difluorophosphate and lithium tetrafluoroborate. The method comprises the following steps that lithium hexafluorophate, lithium carbonate and boron trifluoride react under the condition of reaction solvent existence; the lithium difluorophosphate and the lithium tetrafluoroborate are obtained through preparation. The novel combined preparation method of the lithium difluorophosphate and the lithium tetrafluoroborate provided by the invention has the advantages that two kinds of high-quality lithium salt products are obtained through one-step reaction and simple separation purification; the reaction solvents are properly recovered and repeatedly recovery can also be realized; three wastes are basically not generated; the environment-friendly effect is achieved; the preparation method is suitable for industrial production.

Provided is a process for purifying a fluorine compound capable of yielding a highly pure fluorine compound by removing at least oxygen from a fluorine compound containing an oxygen compound as an impurity. In a process according to the present invention for purifying a fluorine compound, the following is brought into contact with the fluorine compound, which contains an oxygen compound as an impurity, thereby removing at least oxygen: carbonyl fluoride in an amount of a 0.1-fold equivalent or more and a 100-fold equivalent or less of oxygen atoms in the fluorine compound.

The invention relates to a preparation method of lithium tetrafluoroborate, which is characterized in that borane and fluorine gas react to generate boron trifluoride, and the boron trifluoride reacts with halogenated lithium salt dissolved in hydrogen fluoride to generate lithium tetrafluoroborate. The method comprises the following steps: putting LiF in a stainless steel reaction vessel, sufficiently dissolving the LiF in HF, and introducing a certain amount of borane, wherein the mole ratio of the boron element in the borane to the lithium element in the halogenated lithium salt is (1.2-1):1; slowly introducing fluorine gas, sufficiently reacting, and continuing stirring for 2-6 hours, wherein the reaction temperature is -20-15 DEG C; and after the reaction finishes, concentrating the reaction solution to 40-80% of the original volume by heating, filtering to obtain a LiBF4 crystal, and drying to obtain the lithium tetrafluoroborate product.

The invention relates to a method for preparing an anhydrous lithium tetrafluoroborate which comprises the following steps: a lithium source including lithium hydroxide, lithium carbonate, and the like, reacts with fluorine hydride and boric acid to obtain lithium tetrafluoroborate solution, then the lithium tetrafluoroborate solution is condensed, crystallized and recrystallized, ground, and vacuum dried to obtain the anhydrous lithium tetrafluoroborate. The method of the invention adopts a staged temperature rise control, the process of the preparation is simple, raw materials are cheap andthe preparation cost is low, no organic solvent is used during the synthetic process, no poison is produced, therefore, the method accords with the concept of green environmental protection, the anhydrous lithium tetrafluoroborate prepared by the method is determined by a X-ray diffraction map, the diffraction peak is clear and sharp and completely matches the standard card, which shows that the product prepared by the method of the invention is anhydrous LiBF4 with complete crystal form, the quality of the product is equal to the quality of the anhydrous lithium tetrafluoroborate prepared bythe reaction of lithium fluoride and boron trifluoride.