| 摘要 |
FIELD: chemistry.SUBSTANCE: present invention relates to versions of a method for transalkylation of aromatic hydrocarbon compounds. One of versions includes: a. introduction of raw material stream containing aromatic hydrocarbon compounds containing toluene and aromatic C9+ compounds, in transalkylation zone containing a catalyst which contains aluminosilicate zeolite structural type MOR, one or more additional aluminosilicate zeolites, which contain zeolites MFI, oxide inorganic binder and metal component; b. contact of a stream of material with a catalyst in transalkylation zone under transalkylation for producing pure benzene during one or several initial parts of process cycle; c. contacting a stream of material with a catalyst in transalkylation zone under standard conditions for transalkylation in last part of process cycle; and d. reaction product stream containing xylenes and benzene fraction of high purity, in which working conditions for producing pure benzene include one or more conditions selected from a higher operating temperature, lower operating pressure and a lower ratio of hydrogen to carbon with respect to standard conditions for transalkylation during last part of process cycle, working conditions changed gradually during an initial part of technological cycle by changing at least one of conditions: temperature of about 0.5 to about 10 °C, pressure of about 10 to approximately 500 kPa or molar ratio of hydrogen to carbon from about 0.05 to 0.5.EFFECT: use of invention provides commercial-grade benzene with high purity.15 cl, 1 tbl, 2 ex |
