Q1: The most economical range of absorption factor is

ANS:C - 1.25 to 2

The most economical range of absorption factor typically depends on the specific application and process conditions. However, in many industrial applications, the absorption factor (also known as the liquid-to-gas ratio or the solvent-to-feed ratio) is often in the range of 5 to 15. In absorption processes, such as gas absorption or liquid extraction, the absorption factor represents the ratio of the solvent flow rate to the feed flow rate. This ratio affects the efficiency and cost of the process. A higher absorption factor generally indicates a larger amount of solvent relative to the feed, which can enhance the mass transfer efficiency and improve the separation performance. However, excessively high absorption factors can lead to higher solvent usage and increased operating costs. On the other hand, too low absorption factors may result in inefficient mass transfer and lower separation efficiency. Therefore, an optimal range of absorption factor is often chosen to balance the trade-offs between efficiency and cost-effectiveness for a specific application. While the range of 5 to 15 is commonly considered economical for many industrial absorption processes, the optimal range may vary depending on factors such as the properties of the feed and solvent, the desired separation efficiency, and the economics of the process.