Example 2 - HDA Process - University of Edinburgh.

NISHAL VINOO BHIKHA: The Creation of Instructional Video Tutorials for Chemical Engineering Process Simulation Software (Under the direction of Dr. Adam Smith) Process simulation software is rapidly becoming a necessity in today’s world. Often, learning how to use such a complex tool can be difficult and can take a significant period of time.

Figure 1.5 Benzene Process Flow Diagram (PFD) for the Production of Benzene via the Hydrodealkylation of Toluene Stream information is added to the diagram by attaching “information flags.” The shape of the flags indicates the specific information provided on the flag.

An alternative method to prepare benzene from toluene is hydrodealkylation. Reactors compress toluene and hydrogen to pressures between 20 and 60 atmospheres and heat the mixture to temperatures between 930 and 1,220 degrees Fahrenheit.

At high temperatures and pressures, and in the presence of hydrogen, toluene can be demethylated to produce benzene. Furthermore, benzene can react reversibly to produce biphenyl. The following example illustrates the simulation of the hydrodealkylation process, carried out in a membrane reactor.

Skeleton Process Flow Diagram (PFD) for the Production of Benzene via the Hydrodealkylation of Toluene Equipment is represented symbolically by “icons” that identify specific unit operations. Although the American Society of Mechanical Engineers (ASME) (2) publishes a set of symbols to use in preparing flowsheets, it is not uncommon for companies to use in-house symbols.

Chapter 8 Multiple Reactions W8-1 Web Solved Problems Web Example SP-8.1 Hydrodealkylation of Mesitylene in a PFR The production of m-xylene by the hydrodealkylation of mesitylene over a Houdry Detrol catalyst 1 involves the following reactions: (WESP-8.1.1) m-Xylene can also undergo hydrodealkylation to form toluene: (WESP-8.1.2).

Thus, hydrodealkylation consumes 1 mol of H 2 per mol of toluene, while steam dealkylation produces 3 mols of H 2, per mol of toluene in the principal reaction. Many dealkylation plants were built when refineries had a surplus of hydrogen from catalytic reforming, and it was assigned fuel value.

Benzene or benzol(another name for benzene) is one of the most important chemical in the world because of it wide variety of industrial uses.

The refinery processes included in the assessment are aromatics solvent extraction, toluene hydrodealkylation, toluene disproportionation, and benzene-toluene-xylene (BTX) fractiona- tion.. The fractionation associated with each process is included in each process description.

Toluene Hydrodealkylation Toluene Feed Tactic 1 is applied to each unit operation in succession 8 Toluene Hydrodealkylation a. Toluene feed Stream 1 mixes with Stream 11 in. Process Description propylene oxidation to acrylic acid Propylene is supplied as a saturated vapor from storage at 11.5 bar, Stream 3. After throttling.

Modeling and Simulation of a Benzene Recovery Process by Extractive Distillation 285 Brazilian Journal of Chemical Engineering Vol. 32, No. 01, pp. 283 - 291, January - March, 2015 Table 1: Available binary mixture data of the components of interest with NFM.

Process Description. The technology encompasses three main processing areas: reactor section, product distillation and paraxylene (PX) recovery. Fresh toluene and recycled toluene from the product distillation area are mixed with hydrogen. The hydrogen-to-toluene ratio is about 1 to 1.5.