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    • 6. 发明申请
    • METHOD AND SYSTEM FOR CONCENTRATING WASTE SULPHURIC ACIDS FROM NITRATION PROCESSES
    • 从硝化过程中浓缩废硫酸的方法和系统
    • US20100233069A1
    • 2010-09-16
    • US12305902
    • 2007-06-20
    • Ulrich WalterGottfried Dichtl
    • Ulrich WalterGottfried Dichtl
    • C01B17/82B01D3/40
    • C01B17/94B01D3/148B01D3/40
    • Disclosed is a method for recovering diluted waste sulfuric acid containing impurities from nitration processes, a highly concentrated nitric acid required in the nitration process being produced in association with the nitration process by means of extractive rectification with concentrated sulfuric acid which is re-concentrated in order to be reutilized. According to the inventive method, the waste sulfuric acid from the nitration process is fed to the top of a first, indirectly heated stripping column, optionally together with another waste sulfuric acid in the form of a DNT washing acid, and is divided into an overhead product containing nitric acid and nitro-organic compounds as well as a prepurified sulfuric acid in the bottom product. The prepurified sulfuric acid withdrawn from the bottom of the first stripping column is fed to the top of a second, serially connected additional indirectly heated stripping column, into the bottom zone of which another waste sulfuric acid is fed in the form of a diluted sulfuric acid recovered from the nitric acid concentration system such that the prepurified sulfuric acid from the first stripping column is further purified in the second stripping column and is preconcentrated along with the diluted sulfuric acid recovered from the extractive rectification of nitric acid.
    • 公开了一种从硝化过程中回收稀释的含有杂质的废硫酸的方法,硝化过程中所需的高浓度硝酸是通过与浓硫酸进行萃取精馏相结合的硝化过程制备的,该浓硫酸按顺序重新浓缩 被重新利用。 根据本发明的方法,将来自硝化过程的废硫酸进料到第一间接加热的汽提塔的顶部,任选地与另一种DNT洗涤酸形式的废硫酸一起分配成塔顶 含有硝酸和硝基有机化合物的产品以及底部产物中的预硫化硫酸。 将从第一汽提塔底部排出的预纯化硫酸进料到第二个连续连续的另外间接加热的汽提塔的顶部,进入其中另一个废硫酸以稀硫酸的形式进料的底部区域 从硝酸浓缩系统回收,使得来自第一汽提塔的预纯化硫酸在第二汽提塔中进一步纯化,并与从硝酸萃取精馏中回收的稀硫酸一起预浓缩。