Chemical engineers have been practicing process simulation since the advent of the profession in the early 20th century. It was called process design and inevitably involved simplifying assumptions, including that steady-state process conditions had been reached. The required measurements and reliable correlations to describe dynamic excursions from steady state simply did not exist, to say nothing of the cumbersome mathematical tools needed. The availability of electronic, stored-program digital computers, including real-time industrial computers, starting in the late 1950s opened a new window on process simulation.
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