申请人:NIPPON SODA CO., LTD.
公开号:EP1273570A1
公开(公告)日:2003-01-08
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)
(wherein, R1 and R2 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 R3 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.
本发明旨在提供在工业生产中生产高纯度 4,4'-二羟基二苯砜单醚的方法。
在生产由式(I)代表的化合物的工艺中
(其中,R1 和 R2 各自独立地为卤素、具有 1 至 8 个碳原子的烷基或具有 2 至 8 个碳原子的烯基;m 和 n 各自独立地为 0 或 1 至 4 的整数;R3 为具有 1 至 8 个碳原子的烷基、具有 2 至 8 个碳原子的烯基、具有 3 至 8 个碳原子的环烷基或任选取代的芳烷基),(1)在纯化过程中进行两次或两次以上的 pH 调整;(2)去除过量使用的卤化烷基;(3)使用含 0.05 ppm 或更少;(4) 使用内壁有防腐层的储罐;(6) 添加螯合剂;(7) 采用机械搅拌干燥方法。