Multipurpose batch plants

Heat Integration in Multipurpose Batch Plants I. Direct... 

Batch chemical processes are broadly categorised into multiproduct and multipurpose batch plants. In multiproduct batch plants, each produced batch follows the same sequence of unit operations from raw materials to final products. However, the... 

It is evident from the foregoing description and diagrams shown in Fig. 1,7a, b that multipurpose batch chemical plants are more complex than multiproduct batch plants. This complexity is not only confined to operation of the plant, but also extends to mathematical formulations that describe multipurpose batch plants. Invariably, a mathematical formulation that describes multipurpose batch plants is also applicable to multiproduct batch plants. However, the opposite is not true. It is solely for this reason that most of the effort in the development of mathematical models for batch chemical plants should be aimed at multipurpose rather than multiproduct batch plants. 

Majozi, T., Zhu, X.X., 2001. A novel continuous time MILP formulation for multipurpose batch plants. 1. Short-term scheduling. Ind. Eng. Chem. Res., 40(25) 5935-5949 Mignon, D., Hermia, J., 1993. Using BATCHES for modeling and optimizing the brewhouses of an industrial brewery. Comput. Chem. Eng., 17(Suppl.) S51-S56. 

Sanmartf, E., Friedler, E, Puigjaner, L., 1998. Combinatorial technique for short term scheduling of multipurpose batch plants based on schedule-graph representation. Comput. Chem. Eng., 22(Suppl.) S847-S850... 

Majozi, T., 2006. Storage design for maximum wastewater reuse in multipurpose batch plants. Ind. Eng. Chem. Res., 45(17) 5936-5943. 

Wastewater Minimisation in Multipurpose Batch Plants Multiple Contaminants... 

Gouws, J.F., Majozi, T., Gadalla, M., 2008. Flexible mass transfer model for water minimization in batch plants. Chem. Eng. Process., 47 2323-2335 Gouws, J.F., Majozi, T., 2009. Usage of inherent storage for minimisation of wastewater in multipurpose batch plants. Chem. Eng. Sci., 64 3545-3554 Majozi, T., 2005. Wastewater minimization using central reusable storage in batch plants. Comput. Chem. Eng., 29 1631-1646... 

A uneven discretization of time mathematical formulation for direct heat integration of multipurpose batch plants has been presented. The formulation results in smaller problems compared to the discrete-time formulation, which renders it applicable to large-scale problems. Application of the formulation to an industrial case study showed an 18.5% improvement in objective function for the heat-integrated scenario relative to the standalone scenario. 

Majozi, T., 2006. Heat integration of multipurpose batch plants using a continuous-time formulation. Appl. Thermal Eng. J., 26 1369-1377... 

A mathematical approach for optimization of energy use in heat integrated multipurpose batch plants has been presented and tested in a case study. The results have shown that heat integration with heat storage considerations can result in energy savings of more than 75%, compared to standalone operation that relies solely on... 

Majozi, T., 2009. Minimization of energy use in multipurpose batch plants using heat storage an aspect of cleaner production. J. Cleaner Prod., 17 945-950. 

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