Thermal Stability for the Continuous Production of γ-Valerolactone from the Hydrogenation of N-Butyl Levulinate in a CSTR

Round 1

Reviewer 1 Report

Authors investigated Thermal Stability for the Continuous Production of γ- valerolactone from the hydrogenation of n-butyl levulinate in a CSTR

1-In the introduction, it is mentioned that LCBs have cellulose parts that can be converted into chemicals and fuel, considering that the main source of LCBs are trees, does this not harm the environment.

2-In the introduction part, a more comprehensive study should be done and thermodynamic, kinetic and stability works should be mentioned.

3-Graphs and results should be explained more.

4-In Figure 3, why is space time 2000  is better, what is the basis of your choice?

5-Figure 4 needs more explanation.

6-In Figure 6, why the effect of temperature on some parameters is more and some are less.

7- In line 233, figure 5 should be changed to 7.

8-In the results section, more precise and quantitative details and findings should be mentioned.

Author Response

We have replied on the word document

Author Response File: Author Response.doc

Reviewer 2 Report

Using CSTR model, the thermal behavior in a steady-state regime was thoroughly analyzed for the continuous production of γ-valerolactone from n-butyl levulinate over a Ru/C catalyst. The manuscript was well organized and drafted. So the reviewer suggests an acceptation after a minor revision.

1. The author choose CSTR as model. But other models should be mentioned and compared.

2. In section 3.1. the authors mentioned that “a space time value of 2000 s was found to be a good compromise”. A further explanation was suggested for a clear understanding.

3. In formula of rate expression for the cyclization, why there is no ? parameter, related to catalyst loading?

4. The parameter sensitivity for the BL conversion should be given and analyzed.

Author Response

We have replied on the word document.

Author Response File: Author Response.doc