Open AccessImprovements in Waste Minimization, Process Safety, and Running Costs by Integrated Process Development
Author(s) -
D. Morsey,
Masaharu Nishioka,
Georg Suter,
P. Stahala
Publication year - 1997
Publication title -
chimia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.387
H-Index - 55
eISSN - 2673-2424
pISSN - 0009-4293
DOI - 10.2533/chimia.1997.207
Subject(s) - sulfuric acid , extraction (chemistry) , process (computing) , process engineering , environmental science , waste management , process development , consistency (knowledge bases) , contamination , pulp and paper industry , computer science , chemistry , chromatography , engineering , operating system , inorganic chemistry , ecology , artificial intelligence , biology
By the development of a new recycling process for spent acid in the manufacture of the 1-chloro-2,4-dinitrobenzene (CDNB) effective improvements in the waste balance and the process safety were achieved. Under the old process, the sulfuric acid generated could not be sold to the low strength sulfuric-acid market, because it had a high concentration of organic contaminants. The resulting waste stream had long been a costly issue. A laboratory feasibility study followed by pilot evaluation qualified continuous extraction as an appropriate technology for purifying the acid. With the change from a batch extraction process to a continuous extraction on a column, the quality of the acid could be improved such that use without further regeneration is possible now. Thus, the continuous extraction column offered improved efficiency, safety, and product consistency as compared to the corresponding batch process.