| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for acquiring a specific crystal form efficiently and in a higher purity from a chemical compound having a crystal polymorphism.SOLUTION: Provided is a method for sublimating and introducing a chemical compound having two or more crystal polymorphisms into a collection part thereby to precipitate a specific crystal form by an inverse sublimation in the collection part, wherein the collection part is set at a temperature T satisfying the following formula (1): T2≤T≤T1, T1: a precipitation starting temperature by an inverse sublimation of said specific crystal form, and T2: a precipitation starting temperature by an inverse sublimation of a crystal form having a precipitation starting temperature lower than T1. However, there is no crystal form having a precipitation starting temperature between T1 and T2.</p> |
