Ultrasonic Intensification of Mass Transfer in Organic Acid Extraction
Round 1
Reviewer 1 Report
A useful paper providing an analytic method to estimate the processing time and efficiency of the ultrasonic liquid-liquid extraction of organic substances in aqueous mixtures. The technique used features a liquid pseudo-membrane layer containing the mass transfer process due to the radial sinusoidal vibrations of isolated droplets. Several assumptions have been made in deriving the model, for example assuming droplets do not influence neighbours, the droplets remain spherical and of a single representative size. Nevertheless, the mathematical model agrees well with the experimental data presented and it is simple enough to be used in practice.
The problem description is clear and the references adequate. At least 5 references are the authors' own work, but I have not been able to access them to check for commonality with this submission. At least one of the equations (11) seems to be wrong and equation references beyond ~(14) are out of order. I suggest the authors check carefully the sequence.
There are conclusions in the final chapter which are suppositions and they do not stem from the work presented. I marked these in the text and I suggest they are either removed or placed in the introduction/background section.
The language of the text is fine (a bid wordy at times), apart from a few mistypes which I highlighted in the attached file.
Comments for author File: 
Comments.pdf
Author Response
Response to Reviewer 1 Comments
Point 1: The wrong word "manner" in line 36.
Response 1: The word "manner" is substituted by "process".
Point 2: Spaces between words were missed in lines 136, 166, 169.
Response 2: Spaces between words are introduced and grammar is corrected in lines 136, 166, 169.
Point 3: The wrong equation (11) in line 169.
Response 3: The wrong equation (11) in line 169 is substituted by the correct version and improved the notation in line 170.
Point 4: Space between words was missed in line 179.
Response 4: Space between words is introduced in line 179.
Point 5: The wrong presentation in line 181.
Response 5: The reference in line 180 is omitted and spaces are introduced.
Point 6: Number in the formula is wrong in line 188, 189.
Response 6: Number of the formula has been corrected in line 187, 188.
Point 7: The not clear expression in line 198.
Response 7: The expression in line 197 is substituted by another version.
Point 8: Numbers in formulas were wrong in lines 207, 209, 214, 223, 224, 227,257, 262, 270.
Response 8: Numbers in formulas have been corrected in lines 206, 208, 213, 219, 222, 223, 226, 256, 261, 269.
Point 9: The text in lines 298-300 and 305-307 is not appropriate.
Response 9: The text in lines 297-299 and 301 has been excluded and improved.
Authors thank very much Reviewer 1 for the kind attention to the considered task and friendly desires to improve this text.
With best regards
On behalf of authors
O.M.Gradov
Reviewer 2 Report
The manuscript "Ultrasonic intensification of mass transfer in organic acid extraction" as a whole is good scientific work, nothing exceptional but it certainly makes a good contribution to the understanding of the phenomenon of solute extraction with the help of ultrasound. The reported results are of good level and the theoretical aspects are significant for these reasons it can be considered for publication on Processes.
Author Response
Response to Reviewer 2 Comments
We thank you very much for your kind attention to our article and high evaluation of our work. It will support us in our future scientific activity.
With best regards
On behalf of authors
O.M.Gradov
