192
7 Risk Assessment and Management of Chemical Processes
Table 7.12
Results of a HAZOP study of the wet grinding process of cyanuric chloride
Item
Process
conditions
Deviation
Process hazard Process failure
Loss event
Safeguards
Consequences
Batch reactor for
grinding process
of cyanuric
chloride
pH of
approximately 7
Lower pH (1) Autocatalytic
decomposition
reaction of
cyanuric
chloride
(1) Failure in
buffer supply
Decomposition of
cyanuric chloride
(1) Buffer
(prevention)
(1) Thermal
runaway and
thermal explosion
(2) Toxicity
hazards
(cyanuric
chloride, HCl)
(2) Failure of pH
measurement
(2) pH alarm
(prevention)
(2) Release of
hydrochloric acid
(HCl) from the
process
(3) Failure of
electricity supply
(3) Depressurization
(mitigation)
(4) Rupture disk
activation
(mitigation)