The ideas and requirements for digitization in the process industry are manifold - the interoperability of the tools in use by engineers is an important prerequisite. The strong heterogeneity of existing data formats and standards as well as the variety of proprietary and company-specific solutions confronts the process industry with huge challenges. This paper deals with the data exchange between process simulation, 2D CAD, and 3D CAD tools, provides an overview of existing standards and formats as well as initial experiences gained in a case study.