Chemical Engineering June 2018 - 84
FIGURE 6. Using new-found insight, the most successful, consistent batches
can be examined in depth. Using the reference profile, it is possible to generate
upper and lower tolerance limits based on an appropriate value, such as two or
three standard deviations
acterized - using data from onspec
and high-yielding batches
- it is possible to gain insights by
looking at various excursions from
known good values and resulting
off-spec batches (Figure 7). Once
there are reference profiles for every
CPP, it is easier to tell where things
might be going wrong. Instructions
can be written to look for
specific conditions.
One example would be a set of inFIGURE
7. Once the limit bands are established - using data from on-specification
and high-yielding batches - it becomes a simple matter to compare
any batch, successful or not, to those limits and to gain insights by looking at
various excursions from known good values and resulting off-spec batches
structions to find every batch where
the temperature change at the beginning
of the crystallization phase
ran from the high to the low extreme.
With the right data-analytics application,
these types of queries can be
constructed without creating complex
formulas or macros.
Such analysis can also identify
those parameters that are controlled
too tightly. For instance, temperature
does not have to be controlled with
the same level of precision at every
phase of a unit procedure. In fact,
the tolerance range boundaries at
one point can be increased, while at
another they need to be tightened.
Matching the boundaries more appropriately
to the actual needs of the
process reduces costs while improving
batch-acceptance rates.
Applying the tools
This kind of analysis cannot solve evFor
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Chemical Engineering June 2018
Table of Contents for the Digital Edition of Chemical Engineering June 2018
Contents
Chemical Engineering June 2018 - Cover1
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Chemical Engineering June 2018 - Contents
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