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In the case where we increase impurities in feed, will the purge stream flow rate remain...

In the case where we increase impurities in feed, will the purge stream flow rate remain the same, or it will adjust accordingly so as to purge out the impurities in the stream to prevent accumulation
Engineering   Chemical-Engineering   
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Answer #1

If we increase impurities in feed then purge stream flow will be increased.

impurities to be removed so that the accumulation term can be nullified by flow out additional streams.A common way to provide for this is with a purge stream off of the recycle stream.

For example :

We need 0.975 F g and here we note that fresh gas assumed to contain 2.5 percent of inert or impurities. The purge gas, purge gas should comprise of all fresh excess product plus the impurities with fresh gas. So, this becomes F e all fresh excess product plus 0.025 into F g so this is the purge gas.

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