Figure 20.

Comparison of (a) oxygen and (b) monomer conversion profiles in a batch and a semi-batch reactor at three oxygen levels and two MEHQ levels (0 and 200 ppm). Curves 1, 2, and 3 represent oxygen free, 18% oxygen, and fully saturated with oxygen conditions in a batch reactor, respectively, while curves 1′, 2′, and 3′ indicate the same oxygen levels in a semi-batch reactor. The solid curves correspond to the batch reactor, and the dashed curves correspond to the semi-batch reactor. The solid, dashed, dashed-dotted, and dotted curves correspond to batch without MEHQ, semi-batch without MEHQ, batch with MEHQ, and semi-batch with MEHQ processes, respectively. Reprinted/adapted with permission from Ref. [63]. Copyright 2022, American Chemical Society.