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Chapter 18: Problem 58

The hydrogenation reaction shown here was performed with an iridium catalyst, both in supercritical \(\mathrm{CO}_{2}\left(\mathrm{scCO}_{2}\right)\) and in the chlorinated solvent \(\mathrm{CH}_{2} \mathrm{Cl}_{2}\). The kinetic data for the reaction in both solvents are plotted in the graph. In what respects is the use of \(\operatorname{scC} \mathrm{O}_{2}\) a good example of a green chemical reaction?

Short Answer

Expert verified
The use of supercritical CO2 (scCO2) in the hydrogenation reaction is a good example of a green chemical reaction due to its non-toxic, non-flammable and low reactive properties, along with easy separation from the reaction mixture. Furthermore, scCO2 has tunable properties that can be adjusted by varying pressure and temperature, making it suitable for various chemical processes. By analyzing the kinetic data, scCO2 demonstrates better efficiency and reduced waste compared to the toxic and ozone-depleting solvent, dichloromethane (CH2Cl2), resulting in a more environmentally friendly and sustainable reaction process.

Step by step solution

01

Determine the advantages of scCO2 as a solvent

First, we need to assess the advantages of scCO2 as a solvent for the hydrogenation reaction. Some advantages of supercritical CO2 as a solvent include non-toxicity, non-flammability, low reactivity, and easy separation from the reaction mixture. Moreover, it has tunable properties that can be adjusted by varying pressure and temperature, making it an ideal solvent for various chemical processes.
02

Analyzing the kinetic data for the reaction in both solvents

The exercise mentions that the kinetic data for the hydrogenation reaction carried out in both solvents is plotted on a graph. Carefully look at this graph and identify the key differences between the reaction's performance in scCO2 and CH2Cl2. It might help to pay attention to factors such as reaction rate, reaction time, and conversion rate, which can shed light on the green aspects of using scCO2.
03

Comparing the environmental impacts

Now that we have some understanding of scCO2 and the kinetic data, we can compare the environmental impacts of the two solvents used. For instance, CH2Cl2, also known as dichloromethane, is known to have toxic and ozone-depleting properties, which make it a less environmentally friendly option. On the other hand, scCO2 is non-toxic and more sustainable.
04

Assess efficiency and sustainable practices

After analyzing the results from the graph along with the mentioned properties of both solvents, evaluate the efficiency of the hydrogenation reaction in scCO2 compared to CH2Cl2. Look for evidence of reduced waste, less energy consumption, or better efficiency in reaction performance. These aspects will help determine if using scCO2 is a good example of a green chemical reaction. By following these steps and analyzing the provided kinetic data, you can draw conclusions about the green aspects of using scCO2 as a solvent for the hydrogenation reaction compared to CH2Cl2.

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Most popular questions from this chapter

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