>>12938623>BSL or Mccabe-SmithNeither of these are good textbooks.
McCabe, Smith, Harriot in particular relies on ancient paper calculations methods. It is bad at teaching principles and even worse at teaching employable skills. If you care about the industrial side of Chemae then Towler and Sinnott (2nd Ed.) is all you need. Everything before that is outdated 2D boomer graph methods.