The abstract clearly represents what is exemplified in the title, giving clear references of how the process will work for each proposed system by varying certain components, where one component of the system is the one that acts as the key to generate the pH oscillations in each process.

Most of the references are correctly cited, they are relevant since they contain an immense amount of scientific articles from magazines and research centers from different parts of the world.

The introduction itself speaks about the topic to be dealt with in one way or another, that is, it compares your proposal with one already existing. It is not clear how your system can be formed, for example without starting from the existing CSTR reactor, but it is something innovative with respect to pH oscillators, and can open many fields, but perhaps if an analysis of a model created in general for any condition or situation, it would be very helpful in understanding its operation. Of course, this article is a big step to reflect new paths in the extensive study of CSTRs that measure pH fluctuations.

It should be emphasized that the authors place great emphasis on their proposal as opposed to an existing process, specifying that their goal is to create a more efficient reactor in certain cases for the conditions presented.

The system selection process is very well detailed, essentially focusing in the ion concentrations of some chosen substances, and working with exactly three systems. But the point is that it only gives me in-depth details of just one, and if I select all three it also shares detailed information. Which was what happened to not take them into account, as explained with the BMS system.

It gives me certainty of how each system was formed and specific details of how it will be carried out. the transformation from one system to the other (objective system). In general everything is strictly defined, the methods used have a previous support and are governed by this. In other words, they are based on a model created but giving your variations to get results from your own study.

The replication of this study could be applicable in every sense, since the three systems are based on equal compounds in one and the other, but more details of each process would be needed, although it is based on to an already established literature, certain details could be grouped for experimentation. It should be noted that this process is of a long time as mentioned by the developers of the same, then they explained a process with certain variations and the other two to a single condition, so it can be seen a priori.

Both the data, as well as the results tables and graphs obtained, are clearly presented referencing each graph to which process it belongs, and giving a detailed explanation, although for in order to understand this information a little better, they could highlight in the graph that point to which other said concentration value is obtained for each referenced substrate.

The values ​​are specially referenced, also the units, work with two to four significant figures that is, they work with the most convenient value according to the unit that the process implies. They also specify what do these values ​​refer to, what concentration or what temperature or, if not, what time, this being of great help to the reader regarding the compression of the results.

In essence the three systems obtain a favorable result, although the opposite is that the BMS system specifically its operation is different from that of IFS and BFS. In contrast everyone reaches the target but one closer than the other two. So under certain conditions they will all behave like a closed batch reactor, all of this with respect to the exposed. It would be necessary to define in what circumstances or for which processes one would work better for me than the other.

This paper shows how you can go from a CSTR system to a closed one, through three integrated systems, which are BMS, IFS, BFS. Under certain conditions they behave in one way or another, but always their operation is will give through a solution of silica gel and sodium sulphite that are responsible for providing the pH oscillations in these types of system to achieve the goal. Although the article guarantees the operation in the end you do not know if the efficiency of this mechanism will be optimal, since as always there is a margin of error or they cannot always be present the same conditions, the study is specific but not general. However they give options that other systems can be formed to transform a CSTR to a closed reactor to denote pH oscillations in other studies or applications.