Residual risk column

Verification Signature(s) column The signature of the responsible person(s) verifying that the control is in place and is adequate and/or the signature of the person(s) accepting the residual risk. (Signature blocks include printed or typed names and dates.)... 

The last stage of the JHA is to conduct a final risk assessment that determines what level of risk remains. The residual risks of each task are identified in this column. The residual risk should always be less hazardous than the initial risk. If the residual risk is the same, nothing has been accom-phshed to (Figure 9.2). Refer to Figure 11.7 for a documenting the residual risks of the task documentation. 

Only trace amounts of side-chain chlorinated products are formed with suitably active catalysts. It is usually desirable to remove reactive chlorides prior to fractionation in order to niinimi2e the risk of equipment corrosion. The separation of o- and -chlorotoluenes by fractionation requires a high efficiency, isomer-separation column. The small amount of y -chlorotoluene formed in the chlorination cannot be separated by fractionation and remains in the -isomer fraction. The toluene feed should be essentially free of paraffinic impurities that may produce high boiling residues that foul heat-transfer surfaces. Trace water contamination has no effect on product composition. Steel can be used as constmction material for catalyst systems containing iron. However, glass-lined equipment is usually preferred and must be used with other catalyst systems. 

The bottom of the column and its associated equipment this equipment is in contact with alkylate containing residues of HF. Corrosion risks are nevertheless small. 

---