Technology Unit

: Vicinals Separation Column
: Generic TDA Process
Short Name: Vicinals Separation
Description: The Vicinals Separation Column separates out the Toluenediamins with ortho Groups (Vicinals), which boil at slightly lower temperatures (2,3-TDA Boiling Point is 255°C; 3,4-TDA Boiling Point is 265°C) than the desired Product Amines (both 2,4-TDA and 2,6-TDA Boiling Point is 292°C). After removing the Vicinals, the TDA Stream is sent to the Heavy Ends Removal Column.
Link: https://nepis.epa.gov/Exe/ZyNET.exe/9101XOAK.txt?ZyActionD=ZyDocument&Client=EPA&Index=1981%20Thru%201985&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&UseQField=&IntQFieldOp=0&ExtQField