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5442121 
Journal Article 
PARA SELECTIVE CHLORINATION OF TOLUENE WITH AN L-ZEOLITE CATALYST 
Singh, AP; Kumar, SB 
1995 
1 
Applied Catalysis A: General
ISSN: 0926-860X
EISSN: 1873-3875 
126 
1 
27-38 
WOS:A1995RC96300002 
The liquid phase chlorination of toluene with gaseous chlorine using various zeolites as catalysts has been studied. Zeolite K-L is found to be more selective than the other zeolites and the conventional catalyst, FeCl3. The reaction over SiO2 shows lower para-selectivity compared to the zeolites. The influence of various parameters such as the type of zeolite, nature of the solvent, reaction temperature, catalyst concentration, ClCH2COOH/ catalyst ratio and chlorine gas flow rate on the para/ortho-isomer ratio in the chlorination of toluene are reported. The yield of para-chlorotoluene is significantly enhanced by increasing the reaction temperature (studied up to 383 K) and the catalyst amount. The highest para/ ortho ratio (6.66) was obtained over zeolite K-L when a mixture of 1,2-dichloroethane/ toluene in a molar ratio of 1.7 was used. The HCl formed during the reaction deactivates K-L. The selectivity (para/ ortho) decreases marginally with increasing conversion in zeolite K-L catalyzed chlorination. 
PARA-SELECTIVITY; TOLUENE-CHLORINATION; ZEOLITES