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1. What is downcomer backup? Why is it necessary to maintain downcomer backup? Give one possible option to maintain downcomer backup. 2. What is structured

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1. What is downcomer backup? Why is it necessary to maintain downcomer backup? Give one possible option to maintain downcomer backup. 2. What is structured packing and maldistribution of liquid? How to overcome maldistribution of liquid flow in structured packing bed

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