Sentence:  1960, Mack Tyner, <WSD>"Process</WSD> Engineering Calculations: Material and Energy Balances" – Ordinarily a <WSD>process</WSD> plant will use a steam boiler to supply its <WSD>process</WSD> heat requirements and to drive a steam-turbine generator. 
Meaning of the word marked with <WSD> tags:  A set of procedures used to produce a product, most commonly in the food and chemical industries.