Through calculation and analytic comparison of the ma ss transfer coeffi cient of double film and multibute film sulfonation reactor,it is showed that th e decisive factor of the mass transfer coefficient is SO 3 diffusive distance, and it's the mass transfer coefficient nearly comes in accord with the actual co nditions.

The application situation and development of domestic made film sulfonation reactor with 3.

For example, technology of multi-tube film sulfonation reactor and the reactor produced domestically; application of computer science in technology of sulfur trioxide sulfonation; product development of AOS and MES; manufacture of petroleum sulfonate and its use in tertiary process, etc.

Technologies for sulfonation including using sulfur trioxide as sulfonating agent and baking process and the sulfonation equipment such as tubular sulfonator as well are briefed.

Core equipment of sulfur trioxide sulphonation unit——sulfonation reactor;

The new developments of the sulfonation technology of toluene were reviewed,several important types of sulfonation reactors were discussed and a newly developed sulfonation technology of toluene by gaseous sulfur trioxide was reported.

Contrastive test was also performed in a glass tube film reactor.

In the SO3 sulfonation process,the high gas/liquid ratio jet reactor which was simple and compact in structure and stable in operation was applied as the sulfonaton apparatus,and the experiment gained a good result,the maximum conversion of ME is more than 95%,and that of SO3 is 99%,which is comparable with the result of film reactor.