| 摘要 |
<p>A method of crystallization which comprises feeding to a crystallization vessel either a solution of terephthalic acid or a slurry solution in which part of terephthalic acid has been precipitated, crystallizing the terephthalic acid in the vessel to obtain a slurry comprising crystals and the solvent, and discharging the slurry, wherein the slurry discharged from the crystallization vessel is introduced into a liquid cyclone through a tangential-direction inlet, and the slurry component constituting a descending turning flow and flowing out through the lower outlet of the cyclone is returned to the crystallization vessel, while the slurry component overflowing through the upper outlet of the cyclone is discharged. Thus, crystals having a large particle diameter can be obtained. Furthermore, no crystal deposition or accumulation within the crystallization vessel occurs, and the crystallization operation can be stably conducted for long.</p> |
