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Put it this way;
A chemical engineer is in the laboratory developing a new drug for BioX Pharmaceuticals. His team has been at work some time now trying to synthesize the new drug, and finally one day has a breakthrough. After patenting, having the medical scientists perform trials, and getting the FDA to approve the new drug BioX decides to put it into production. The engineer, working alongside other engineers, may develop an automatic system to manufacture the drug. Someone has to monitor the manufacturing system; programme the machines, make sure they are working well, and replace the chemicals needed to manufacture the drug. That's where the Technologist comes in and that's what they do, depending on the level of their education. Some techs may just programme or maintain the machines and chemicals. Others are in management positions, sales, and applied engineering. Still, others may work as lab assistants to the engineers. Working the instruments, setting up experiments, and collecting data. This is what most chem techs probably do.