申请人:——
公开号:US20030092941A1
公开(公告)日:2003-05-15
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)
1
(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.
本发明提供了一种在工业生产中优势地生产高纯度4,4'-二羟基二苯基砜单醚的方法。在生产式(I)1所表示的化合物的过程中(其中,R1和R2分别独立地表示卤素、具有1至8个碳的烷基或具有2至8个碳的烯基;m和n分别独立地表示0或1至4的整数;R3表示具有1至8个碳的烷基、具有2至8个碳的烯基、具有3至8个碳的环烷基或可选地被取代的芳基烷基),(1)在纯化过程中进行两次或更多的pH调节,(2)去除使用过量的烷基卤化物,(3)使用含有0.05ppm或更少铁组分的溶剂,例如水,(4)使用具有耐腐蚀层的内壁的罐,(6)添加螯合剂,以及(7)应用机械搅拌干燥手段。