摘要 |
<p>The present invention is to provide methods for producing highly pure 4,4'-dihydroxydiphenyl sulfone monoethers advantageously in industrial production. In a process for producing a compound represented by Formula (I) <CHEM> (wherein, R<1> and R<2> are each independently halogen, alkyl having 1 to 8 carbons or alkenyl having 2 to 8 carbons; m and n are each independently 0 or an integer of 1 to 4; and R<3> is alkyl having 1 to 8 carbons, alkenyl having 2 to 8 carbons, cycloalkyl having 3 to 8 carbons or optionally substituted aralkyl), (1) a pH adjustment is carried out twice or more in the purification process, (2) an excessive amount of alkyl halide used is removed, (3) a solvent, such as water, containing 0.05 ppm or less of iron components is used, (4) tanks with corrosion-resistant layers over the inner walls are used, (6) a chelating agent is added, and (7) a means of drying with mechanical stir is applied.</p> |
申请人 |
NIPPON SODA CO., LTD.;NISSO FINE CO., LTD. |
发明人 |
KATSUURA, KIYOSHI;HIDAKA, TOMOYA;TAKASHINA, YUTAKA;OHNUKI, YASUO |