| 摘要 |
<p>It is an important problem in a process for preparing a m-hydroxyalkylbenzene by sulfonation, isomerization, hydrolysis, and alkali fusion of an alkylbenzene how to facilitate the control of the step of hydrolysis for efficiently and steadily preparing a contemplated m-hydroxyalkylbenzene. The present invention relates to a process for preparing a m-hydroxyalkylbenzene by isomerizing an alkylbenzenesulfonic acid mixture in the presence of sulfuric acid to give an alkylbenzenesulfonic acid mixture having a high m-isomer content, selectively hydrolyzing the alkylbenzenesulfonic acids other than the m-isomer, and caustically fusing the nonhydrolyzed alkylbenzenesulfonic acid to prepare a m-hydroxyalkylbenzene, characterized by starting the hydrolysis while continuously adding water or steam to a reaction mass having a sulfuric acid content of 18 to 25 % by weight in the temperature range of from 160 to 190 °C, gradually increasing the sulfuric acid content of the reaction mass, and terminating the hydrolysis in the temperature range of from 162 to 168 °C when the sulfuric acid content of the reaction mass reaches 30 to 40 % by weight.</p> |
