div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Chemical process control src=https:reader035vdocumentssitereader035viewer202208172055a377ba1a28ab863a8b45f2html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divpWhy we need process controlpdiv