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PhD eng. Valeriu Jumanca worked in the chemical

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industry at the Synthetic Fibre Factory from Săvineşti for more
than 30 years (1960–1994) and also as a teacher at the Faculty
of Engineering of Bacău, teaching organic chemistry. Thus, the
author is a connoisseur of the issues in the organic chemical
technology of our country and at the same time he is trained to
present such issues to the individuals interested in the topic
mentioned above. A proof of the aforementioned aspects is that
PhD eng. Jumanca has recently published a book in this
direction, titled Mechanisms of the associated chemical
reactions of removal–addition to acetaldehyde cyanohydrin and
acetone cyanohydrin, Stef Publishing House, Iaşi, 2012, a book
appreciated by the specialists in that direction.

This book – Fractionated Thermal Decomposition of the
Residual Ammonium Sulphate into Ammonia, Sulphur Dioxide.
Kinetics and Reaction Mechanisms – is divided into 7 chapters.
In the introduction to the paper, the author illustrates that
ammonium sulphate is obtained as a secondary product to the
preparation of ε-caprolactam from cyclohexanonoxim through
the Beckmann rearrangement, in the presence of the sulphur
acid.

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In chapter I – Comparative literature information
concerning the thermal decomposition of the residual ammonium sulphate and the exploitation of the end products (pp. 15–17) –, based on the occurring processes, the author concludes that the resulted gas mixture (sulphur dioxide and oxygen) can be used for the preparation of the sulphur trioxide, and the procurement of the sulphuric acid.

Chapter II, Procurement of the attenuated molecular reaction mass in the process of thermal decomposition of the residual ammonium sulphate (pp. 18–29) presents the reaction mechanisms which take place during the Beckmann rearrangement of the oximes in general and the cyclohexanonoxim in particular. The discussions in this chapter convince the reader of the facts the author had demonstrated ever since the previous paper, namely: a good technologist must be simultaneously a good connaiseur of the theoretical chemistry and of the chemical reaction mechanisms taking place.

Chapter III, Thermal decomposition of the residual ammonium sulphate in ammonium bisulphate and ammonia (pp. 30–43) has as first a subchapter: 1. Experimental data and observations. In this subchapter, we describe the two types of equipments in which the process was experimented: a 30o slanting longitudinal reactor (presented in fig. 1, p. 31) which allows the permanent outflow of the ammonium bisulphate melt and a ball-shaped reactor, fitted with a disposal nozzle, also slanting at 30o. The next subchapter presents the mechanism of the chemical processes which take place. The last subchapter presents the reaction kinetics, respectively the thermal decomposition speed of the ammonium sulphate. The decomposition duration varies depending on the type of reactor where the decomposition is done, longitudinal or ball-shaped, being shorter in the longitudinal reactor.

Chapter IV, Procurement of the ammonium pyrosulphate from the resulted ammonium bisulphate and its thermal decomposition into ammonium sulphate, sulphur dioxide and oxygen (pp. 44–94) has 3 subchapters, (1. Experimental data and observations. 2. Thermic analyses and 3. Interpretation of the DSC calorimetric diagram and of the TGA thermogravimetric diagram). The last subchapter is the longest (pp. 51–95), due to multiple figures rendering calorimetric and thermogravimetric diagrams. The last subchapter of chapter IV comprises a detailed discussion of the mechanisms of the chemical processes occurred. (see: group of reactions (4) – (8), pp. 70–76) as well as the energetics of the processes (see p. 78, Fig. 3). The chapter ends with the presentation and discussion of the DSC calorimetric diagrams and the TGA thermogravimetric diagrams, obtained based on the studies that were conducted.

The next chapter, chapter V, Lab equipments (pp. 96–118) also has 2 divisions: 1. Lab equipments for the thermal decomposition of the residual ammonium sulphate in ammonium bisulphate melt, and ammonia, describing the equipment with ball-shaped reactor plant (see figure on p. 98 and the detail on p. 100) and the plant with longitudinal reactor (see figure on p. 102 and the details on p. 105, p. 106). At the same time, we present the table with the features of the raw materials (residual ammonium sulphate, the lampblack) and the resulted ammonium bisulphate. The second part of this chapter presents the lab plant for the procurement of the ammonium pyrosulphate equipment and its decomposition into ammonium sulphate, sulphur dioxide and oxygen (see figure on p. 115).

Chapter VI, Disposal of the resins and organic
substances from the ammonium pyrosulphate by filtering, for
exploitation (pp. 120–123) and Chapter VII, Corrosion –
Construction materials (pp. 124–125) ends the presentation
done by PhD. eng. Valeriu Jumanca. Obviously, the book
presents at the end the bibliography indicated by the author (pp.
126–128). The 28 quoted works are treaties and books of
theoretical chemistry or technology published in the country or
abroad, patents in this direction, many of them belonging to the
author of this book.Therefore, I strongly recommend the book
presented by PhD. eng. Valeriu Jumanca, a book born from his
passion for chemical technology, from the experience gained
during his entire activity and his desire to transmit this passion
to the others.
PhD. eng. Professor Florin Dinu Badea