(CAPE is short for Computer Aided Process Engineering) is a standard for writing computer software interfaces. It is mainly applied in process engineering where it enables a standardized communication between process simulators (e.g. Aspen Plus) and products developed by ourselves. The advantage of CAPE-OPEN is that these products are applicable to more than just one process simulator; they are aimed at all process simulators that are CAPE-OPEN compliant.


The CAPE-OPEN products that we have developed are thermodynamic models

  • CPA – an advanced model that is an extension of the SRK equation of state
  • PC-SAFT – a model that like CPA accounts for association phenomena

and unit operations

  • PT-flash – that allows the user to choose any of the thermodynamic models of the given process simulator, and
  • CO2 absorber – based on the latest development of the alkanolamines MEA and AMP.

The CAPE-OPEN developments at the Center have been and are still a substantial part of the industrial funded research project CHIGP (short for Chemical in Gas Processing). Especially, the need for a thermodynamic model capable of a precise description of associating systems has driven the development. Moreover, the newly initiated CO2 capture project is focusing on the tailor-made unit operations for CO2 absorption and desorption.


In 2001, CAPE-OPEN Laboratories Network (CO-LaN) (link til: was established as a result of a number of projects financed by the European Commission. It is a non-commercial organization for the testing and management of the CAPE-OPEN standards. At the web site of CO-LaN a number of wizards for constructing the computer programs for thermodynamic property packages (i.e. thermodynamic models) and unit operations are presented.


CAPE-OPEN Contact person: Alay Arya  (


Nicolas von Solms
Associate Professor
DTU Chemical Engineering
+45 45 25 28 67


Georgios Kontogeorgis
DTU Chemical Engineering
+45 45 25 28 59


Alay Arya
Software Manager
DTU Chemical Engineering
+45 45 25 28 64