I haved seeked more diagrams of the continuous process of mononitrotoluene, but I haven't found them. Do you have a diagram for the patent us6583327?
I tend to use two sites for initial viewing of patents and applications. Patents.google.com and The Lens. This simple question was interesting in that it looks like this particular patent doesn't have any figures. I downloaded the PDF and in no place is the term "fig" or "figure" present. I also briefly read through the patent and couldn't find any references to figures or diagrams. This may be the only patent I've seen without a figure. Here are links to the PDFs obtained from patents.google.com and The Lens.
For the process patents it's not rare that there is no diagrams, figures, drawings, images nor illustrations. It's normal. It happens all the time.
Actually many chemical and pharmaceutical patents don’t have figures since the structures are contained in/with the text.