Washing and Purification of Nitrated Aromatics
NORAM expertise in nitration technology extends to washing and purification of crude nitro-compounds. These treatments involve both standard and proprietary equipment and procedures. Today, more than half of the world's mononitrobenzene (MNB) supply is washed and purified using NORAM's technology. This success is a result of in-depth knowledge of the system chemistry and hydraulics, and attention to the engineering details of the process.
In the particular case of MNB, washing and purification consist of four steps, all of which are classical mass transfer operations. Firstly,
the entrained mineral acids from the nitration process are removed from the crude MNB by extraction with water. This
Secondly, nitrophenols are removed from the MNB by reaction and extraction in a weak alkaline solution. This step may require
Thirdly, the washed MNB is rinsed with water to remove residual traces of impurities. Subsequently, the MNB is introduced
In a stripping column, the excess benzene is stripped and recycled to the process. Product MNB, saturated
In a distillation column, the excess benzene and soluble water are removed to produce a dry MNB product. This alternate configuration finds application at sites where gas phase aniline technology is used downstream, or at sites where the MNB is sold on the merchant market.
Key Features and Benefits of the NORAM Process