【Daily Question】Chemical Engineering Principles 216: Recirculation (October 28)
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This post was last edited by Zaihui Kangqiao on 2015-11-2 at 13:11. The Chemical Engineering Theory section is now launching a \"One Question per Day\" initiative to help everyone reinforce their basic knowledge in chemical engineering. Subsequent series such as \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\" will also be introduced. We hope for your active support! Answers to the questions in the \"One Question per Day\" initiative can be viewed directly, and the thread will be closed after 1 day! ! You receive 3 wealth rewards just for participating, and an additional 3 wealth points are given for correct answers. Short answer question: What is the significance of full reflux and minimum reflux ratio? What is the use of each? How many times the minimum reflux ratio is the general appropriate reflux ratio? At full reflux, the minimum number of theoretical plates is required to meet the specified separation requirements. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which can be as infinite as needed. It is the basis for selecting an appropriate reflux ratio. The generally suitable reflux ratio is 1.1 to 2.0 times the minimum reflux ratio.
At full reflux, the reflux ratio R is equal to infinity. At this point, the product at the top of the tower is zero; typically, both the feed and the product at the bottom of the tower are also zero, meaning that neither feed is supplied nor any product is removed from the tower
At full reflux, the minimum number of theoretical plates is required to meet the specified separation requirements. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which can be as infinite as needed. It is the basis for selecting an appropriate reflux ratio. The generally suitable reflux ratio is 1.1 to 2.0 times the minimum reflux ratio.
Full reflux: All of the gas at the top of the tower is condensed into liquid for reflux. This approach results in high energy consumption, but it yields the best distillation efficiency. Minimum reflux ratio: the ratio of the condensate volume at the top of the tower to the output from the top of the tower, under the condition that distillation is effective. Lowest energy consumption. The generally appropriate reflux ratio is 1-2 times the minimum reflux ratio.
Answer: At full reflux, the minimum number of theoretical plates required to meet the specified separation requirements is achieved. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which can be as infinite as needed. It is the basis for selecting an appropriate reflux ratio. The generally suitable reflux ratio is 1.1 to 2.0 times the minimum reflux ratio.
At full reflux, the minimum number of theoretical plates is required to meet the specified separation requirements. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which can be as infinite as needed. It is the basis for selecting an appropriate reflux ratio. The generally suitable reflux ratio is 1.1 to 2.0 times the minimum reflux ratio.
At full reflux, the minimum number of theoretical plates required to meet the specified separation requirements is achieved. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which can be as infinite as needed. It is the basis for selecting an appropriate reflux ratio. Generally, the appropriate reflux ratio is 1.1 to 2.0 times the minimum reflux ratio.
Full reflux means that all liquid is returned, with no product recovered, while minimum reflux is intended to maintain the heat balance of the tower.
At full reflux, the minimum number of theoretical plates is required to meet the specified separation requirements. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which is used as a basis for selecting an appropriate reflux ratio. The generally suitable reflux ratio is 1.1 to 2.0 times the minimum reflux ratio.
During reflux, the minimum number of theoretical plates required to meet the specified separation requirements is achieved. At the start of operation, it is an unstable process; in order to meet the separation requirements as quickly as possible, full reflux operation is used, after which the reflux ratio is gradually reduced until the specified value is reached. The minimum reflux ratio refers to the maximum number of theoretical plates required to meet specified separation requirements, which can be as infinite as needed. It is the basis for selecting an appropriate reflux ratio. The generally appropriate reflux ratio is 1.1 to 2.0 times the minimum reflux ratio