The complex operating sequences of integrated batch plants involve many discrete operations. This renders their simulation using current process modelling tools particularly difficult. The gPROMS (generalised PRocess Modelling System) package is an equation oriented modelling tool for combined discrete and continuous processes, which makes it particularly suitable for the modelling and simulation of batch plant operations. This paper summarises the results of a project in which gPROMS was evaluated using a realistic industrial case study. The simulated process consists of a series of batch operations carried out in sequence in a plant comprising three reactors, one buffer tank, and two distillation units. Utilities include steam, hot and cold water and a flue gas vent. Each unit operates according to a precise schedule. Our objective was to simulate the exact load on the utilities during a typical production cycle (about 50 hours from raw materials to products). gPROMS was also used to carry out parametric studies on the effect of equipment size or, plant performance. Finally, we analyse the performance of gPROMS in an industrial environment and judge its potential for further widespread industrial applications.