Deputies said one of the employees, a 61-year-old man, was standing on a grate when he slipped and fell into the vat.
The other man tried to pull the victim from the vat but was not able to help, deputies said.
According to deputies, fumes from the byproduct overwhelmed the victim and he slipped further into the vat.
Reedy Creek Fire assisted with the recovery of the man.
Deputies have not released any names.
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