Paper Information

Journal:   JOURNAL OF ENERGETIC MATERIALS   SUMMER 2012 , Volume 7 , Number 2(15); Page(s) 17 To 25.
 
Paper: 

SELECTIVE TERT -BUTYLATION OF P -CRESOL WITH ACIDIC IONIC LIQUIDS

 
Author(s):  FAREGHI ALAMDARI R.*, GHORBANI ZAMANI F., ZEKRI N., KOZEHGARI GH.
 
* MALEK-ASHTAR UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

Uses of antioxidants in composite propellants formulation are unavoidable. These materials are added to propellants to afford stability during storage time. In this paper, synthesis of 2-t-butyl p-cresol intermediate for the preparation of A.O.2246 using Bronsted acidic ionic liquids as catalyst and solvent were investigated. Methyl-tert-butyl ether was used for tert butylation of para cresol and variable reaction parameters such as temperature, mole ratio, type and catalyst composition and time were optimized. Tert butylation of p-cresol gives two products, 2-tert-butyl p-cresol and 2, 6-di-tert-butyl p-cresol. Among ionic liquids, triphenyl (butyl-4-sulphonyl) phosphonium sulfonate, irrespective of the alkylating agent, is the most active catalyst. In the presence of triphenyl (butyl-4-sulphonyl) phosphonium sulfonate, 2-t-butyl p-cresol was the main product of reaction with 91.7% of selectivity and 73.2% of p-cresol conversion.

 
Keyword(s): COMPOSITE PROPELLANT, TERT -BUTYLATION, P -CRESOL, A.O.2246 ANTIOXIDANT, IONIC LIQUIDS
 
References: 
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