Catalytic transformations of m-xylene in presence of aluminum silicates

Autor: E. D. Tulupova, N. I. Shuikin, Z. P. Poliakova
Rok vydání: 1958
Předmět:
Zdroj: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 7:1422-1426
ISSN: 1573-9171
0568-5230
DOI: 10.1007/bf00914856
Popis: 1. A study was made of the conditions required for the isomerization of m-xylene in presence of gumbrin and of a synthetic aluminum silicate catalyst at different temperatures and pressures. 2. In presence of gumbrin the isomerization of m-xylene proceeds most smoothly at 450‡ under atmospheric pressure and at a space velocity of 0.5 hour−1. Under these conditions the yield of p-xylene attains 91.2% of the equilibrium amount. 3. The use of reduced pressure (50 mm) favors the complete elimination of undesirable methylation and demethylation reactions and makes it possible to obtain almost 100% of liquid catalyzate containing 15.6% of p-xylene. The use of hydrogen under pressure (15 atm) results in the complication of the isomerization reaction by side reactions. 4. The synthetic aluminum silicate was a less effective catalyst than gumbrin in that it favored side reactions and gas formation to a greater extent. 5. In presence of Pt-Al2O3 at 500‡, m-xylene was again isomerized into the o- and p-isomers, but simultaneous formation of toluene (up to 5.5%) and trimethylbenzenes (up to 2.5%) occurred.
Databáze: OpenAIRE
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