Robert W. Johnson's Essential Practices for Managing Chemical Reactivity Hazards PDF

By Robert W. Johnson

In its fresh research of chemical reactivity injuries, the USA Chemical security Board famous a spot in technical counsel and regulatory insurance. This quantity closes the space in technical information, supporting small and big businesses alike establish, handle, and deal with chemical reactivity dangers. It courses the reader via an research of the possibility of chemical reactivity injuries to aid hinder fires, explosions, poisonous chemical releases or chemical spills. This quantity is appropriate to techniques at any scale and is very valuable for chemists, security managers, and engineers thinking about scale-up. An enclosed CD-ROM presents transportable checklists, research instruments, and an inventory of extra references.

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As such, processes involving partial oxidation should answer NO to Question 5. If intentional chemistry is practiced at your facility and the answer to Question 5 is NO, then chemical reactivity hazards can be expected. As was noted earlier, it is not the intention of this Concept Book to cover all the complexities of the intentional chemical reactions being practiced in indus- 3 Preliminary Screening Method for Chemical Reactivity Hazards 41 try. The essential practices in Chapter 4 are appropriate considerations for facilities involving intentional chemistry.

The additional heating could also cause a vessel or container to be overpressurized due to liquid boil-off or heating of the gases inside an enclosure. What Can Go Wrong? Possible causes of uncontrolled reactions associated with heat-generating mixing or physical processing operations include abnormal events such as the following: • • • • • • • • • • • • • • Inadequate clean-out or purge Too much material added Too little or no diluent added Materials added in wrong sequence Material added too rapidly Contaminant or wrong material added Cooling lost Incoming material too hot Ability to transfer heat away from mixture reduced or lost Mixing or agitation lost Excess or prolonged mixing or agitation Off-gas vent blocked or not opened Off-gas vent pressurized Containment vessel pressurized.

Note that heat effects do not necessarily indicate that a chemical reaction is taking place. Some physical processes such as mixing or dilution can generate or absorb heat. However, heat effects are very often the result of a chemical process. Various processes such as mixing, dissolving, distilling, or extracting may involve intentional chemistry or may be purely physical processes. A 3 Preliminary Screening Method for Chemical Reactivity Hazards 35 chemist or other expert should be consulted if you are still uncertain whether your facility does or will involve intentional chemistry.

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