Recent progress in the technology for concentration of formic acid aqueous solutions

As an important chemical raw material, formic acid is widely used in many fields. In many industrial processes, a large amount of low-concentration formic acid solution is produced and cannot be used directly. If it is discharged into the environment, it will lead to a serious waste of resources and environmental pollution. Therefore, it is of great practical significance to concentrate and reuse formic acid aqueous solutions. This paper reviews the current methods for the concentration of formic acid aqueous solutions, including distillation, extraction, membrane distillation, electrodialysis, dehydrating agent concentration and freeze concentration. The underlying principles and application examples of various concentration methods are introduced, and their advantages and disadvantages are summarized. Finally, possible further advances in technology for the concentration of formic acid aqueous solutions are discussed.