| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing 2,2'-bis(2-hydroxyethoxy)-1,1'-bi-naphthalene that is suitable as raw material monomer for various resins including optical resin, that is excellent in processability and in productivity, and that is novel.SOLUTION: We have found the problem can be solved by reusing some or all of the mother liquid obtained by crystallizing 2,2'-bis(2-hydroxyethoxy)-1,1'-bi-naphthalene crystal from a solution in which 2'-bis(2-hydroxyethoxy)-1,1'-bi-naphthalene is dissolved, followed by solid-liquid separating the same, as a part of 2,2'-bis(2-hydroxyethoxy)-1,1'-bi-naphthalene crystallization solution.</p> |
