(378b) Development of the Novel Manufacturing Process of High Purity LiOH?H2O from Li2CO3 Using Acetic Acid
AIChE Annual Meeting
2019
2019 AIChE Annual Meeting
Separations Division
Poster Session: General Topics on Separations
Tuesday, November 12, 2019 - 3:30pm to 5:00pm
Therefore, this laboratory aims to develop a synthesis process of lithium hydroxide monohydrate of the quality required for batteries, save energy and save resources of the process. We aimed to develop a crystallization process at room temperature that does not require latent heat, and at the same time focus on the immobilization of carbon dioxide that is synthesized as a by-product, as well as the process by thermal concentration up to now.
In this study, we applied the crystallization process and developed the synthesis process to synthesize high purity LiOH · H2O from crude Li2CO3. There are various methods of crystallization, but in this study, we aimed to apply a crystallization process at room temperature without temperature change, in order to aim at development of an alternative process to heat concentration. In addition, as the crystallization operation, the possibility of high purification was studied from the crystallization operation of both reactive crystallization and antisolvent addition crystallization.
In order to develop a high purity process of LiOH · H2O, it was examined whether the process could be developed using major acids and alkalis. At this time, it has been confirmed that the synthesis process using CH3COOH is applicable to the above-mentioned crystallization operation. Furthermore, it was confirmed from the XRD analysis result when the reaction was examined that other impurities could be sufficiently removed by using KOH. The amount of poor solvent addition crystallization using CH3COOH and KOH and the amount of crystallization of the reaction were studied from the crystallization operation. As the crystallization conditions, the temperature is high, the stirring speed is slow, and the shorter the dropping time, the higher the crystals. It has been confirmed that purification can be performed. Finally, we report that it has become possible to increase the crystal purity to 99.95 wt%.