[Hmim][HSO₄], a Green and Recyclable Acidic Ionic Liqiud Medium for the One‐Pot Nitration of TADB to HNIW

Abstract

An efficient and mild procedure for the one‐pot preparation of CL‐20 from TADB in the presence of the Brønsted acidic ionic liquid 1‐methylimidazolium hydrogen sulfate [Hmim][HSO4] as catalyst was developed. The ionic liquid was stable during the reaction process and could also be reused several times with steady activity. In order to optimize the process parameters to obtain higher yield and purity, a study was carried out with variation of the ionic liquids and some parameters like temperature, mole ratio of [Hmim][HSO4] and nitric acid. This procedure may be a practical alternative to the existing procedures to meet the nees of academics as well as industry.

Preparation of MCM-41 Supported Benzene Sulphonic Acid, a Catalyst for the Synthesis of CL-20 from TAIW

“…The last step in the preparation of CL-20 involves the nitrolysis of one of these precursors. In this regard, several nitrolysis systems have been applied, such as nitrating acid and 1-methylimidazolium hydrogensulfate ([Hmim][HSO 4 ])/HNO 3 [5,6]. Hitherto, a mixture of concentrated nitric acid and sulphuric acid in different proportions is the classical nitrolysis method.…”

An Efficient and Facile Synthesis of CL‐20 from TADNO Using HNO3/N2O5 and Optimization of Reaction Parameters by Taguchi Method

“…[a] Y. Bayat Using mixed acids in the nitration and nitrolysis processes generates large quantities of corrosive waste.T oday, with increasingd emandf or consideration of environmental protection, extensive efforts have beenm ade to develop new nitration and nitrolysis methods to avoid using such am ixture.I nt his regard,s ome nitrating agents (instead of HNO 3 )a re introduced such as nitrogen dioxide, proxy nitrite [10],o rganicn itrating agents [11],n itronium salts, and dinitrogen pentoxide [12].M oreover,n itration methods catalyzed by recyclable acids (instead of H 2 SO 4 )a re also reported such as acidic zeolites [13] or ionic liquids [14].…”