| 摘要 |
<p>Sulfonation of a sulfonatable organic compound is effected by means of a two-stage reaction with an SO3-containing gas, in which the first-stage reaction is carried out by flowing, in parallel flow relation, said organic compound and said SO3-containing gas upwardly into the lower ends of a plurality of vertically positioned cylinders or double-cylinders, and the second-stage reaction is carried out by the steps of collecting the reaction product of the first-stage reaction, adding fresh SO3-containing gas to the reaction product thus collected and flowing in parallel flow arrangement the reaction mixture downwardly into the upper end of a vertically positioned cylinder or double-cylinder.</p> |
