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6255118 
Book/Book Chapter 
23-P-30 - Selective chlorination of diphenylmethane over zeolite K-L 
Kale, SM; Singh, AP 
2001 
1 
Studies in surface science and catalysis
ISSN: 0167-2991 
Elsevier 
Studies in Surface Science and Catalysis 
135 
238 
Publisher Summary This chapter discusses selective chlorination of diphenylmethane (DPM) over zeolite K–L. The liquid-phase chlorination of DPM to 4,4′-dichlorodiphenyl-methane (4,4′-DCDPM) is investigated over a number of zeolite catalysts using sulfuryl chloride as the chlorinating agent under mild reaction conditions. Zeolite K–L is found to be highly active and selective in the formation of 4,4′-DCDPM. The conventional Lewis acid catalyst aluminum chloride (AlCl3) is not at all selective in this reaction. The conversion of DPM increases with time over all the catalysts. The reaction is very fast with zeolite K–L and gives almost 68 wt.% conversion after 5 min of reaction time. The yields of DCDPM increase with reaction time with an obvious decrease in the yields of monochlorodiphenylmethanes (MCDPM). 
Vedrine, J.