TITLE: CEPHDA: Chemical Engineering Process Hierarchical Design with 
ASCEND
AUTHORS: Dee, K. and Westerberg, A.
PUBLICATION: EDRC 06-140-92, Engineering Design Research Center 
research report, Carnegie Mellon University
DATE: 1992
ABSTRACT: CEPHDA is a computer-aided chemical engineering process 
design tool, which we implemented in the ASCEND (Advanced System for 
Computations in ENgineering Design) modeling environment. CEPHDA 
contains models for levels 2 (treating a whole process as a "black box") 
and 3 (implementing recycle flows) of the hierarchical design process 
which Douglas (1988) developed in his text 'Conceptual Design of Chemical 
Processes.' We have tested CEPHDA by modeling a three step process 
from toluene to benzene to ethyl benzene to styrene. The CEPHDA library 
was created so that inexperienced process engineers can readily create, 
evaluate, and optimize such models.