Isopropyl-toluene

Selectivity to p-isopropyl toluene being close to 30 % was achieved with SSZ-33, SSZ-35 and Beta zeolites. This is connected with the 12-MR channels in SSZ-33 and Beta. In the case of SSZ-35 the presence of 18-MR cavities decreased the differences in the rate of transport of individual isopropyl toluene isomers. In contrast, ZSM-5 zeolite behaves as para-selective catalyst in this alkylation reaction, the selectivity to p-isopropyl toluene reached 76 % after 180 min of T-O-S. 

In toluene disproportionation the highest toluene conversion was achieved over SSZ-33 due to a high acidity combined with 3-D channel system. High toluene conversion over SSZ-35 results from its strong acidity and large reaction volumes in 18-MR cavities. Toluene conversion in the alkylation with isopropyl alcohol is influenced by a high rate of competitive toluene disproportionation over SSZ-33. ZSM-5 exhibits a high p-selectivity for /7-isopropyl toluene, which seems to be connected with diffusion constraints in the channel system of this zeolite. 

Cymene, Isopropyl-toluene or 1-MethyI-icopropyI-bcnzene (o-Cymene) and iso-Cymene (m-Cymene)... 

Answer V-d is i dialkyl aromatic molceitic (/ isopropyl toluene). 

Toluene for further processing into nitro-, chloro-and isopropyl toluenes for polyurethane plastics, explosives, dyestuffs, antioxidants and plant-protecting agents, and if required, for dealkylation to benzene,... 

Production of cymenes or isopropyl toluene from toluene and propylene is an adaptation of cumene process from benzene and propylene. Through hydroperoxidation of cumene and cleavage of the resultant molecule, phenol and acetone are produced. 

Production of cresols based on alkylation of toluene, oxidation of cymenes, or isopropyl toluenes and cleavage into cresols and acetone is a direct extension of phenol process from benzene. The process is, however, more complex since three isomeric cymenes and cresols are involved. The chemistry of the process is as follows ... 

ISOPROPYL TOLUENE (99-87-6) Forms explosive mixture with air (flash point 116°F/47°C). Incompatible with nitric acid, strong oxidizers. Attacks and softens rubber. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

The Ir/C catalyst produces large amounts of hydrogenolysis products thus up to 11 % of p-menthanes are formed at 333 K, and p-isopropyl toluene is detected in increasing amounts with temperature up to a 0.7% yield at 373 K. The formation of aliphatic hydrocarbons may also occur. The presence of these hydrogenolysis products may explain the deactivation of the catalyst which occurs mainly at higher temperatures. 

TABLE 1 Constant of reactions peroxy radical from isopropyl toluene with antioxidants 2-6 and values of coefFicient of stopping of chain. 

Desalkylation Isopropyl toluene Molekule peroxy radical Steric effect... 

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