Back to results
US 7,119,239 B2Granted
Manufacture of xylenes using reformate
AssigneeExxonMobil Chemical Patents Inc.
InventorsDavid L. Johnson, Robert G. Tinger, Robert A. Ware, John S. Buchanan, Xiaobing Feng, Shifang Luo, Gary D. Mohr
Life of this patent
Estimating the term…
Abstract
A process is provided for the production of xylenes from reformate. The process is carried out by methylating under conditions effective for the methylation, the benzene/toluene present in the reformate outside the reforming loop, to produce a resulting product having a higher xylenes content than the reformate. Greater than equilibrium amounts of para-xylene can be produced by the process.
Claims34
A process for the production of para-xylene, which process comprises:
- (a) providing a reformate comprising:
- (i) hydrogen;
- (ii) C1–C5 hydrocarbons, (iii) C6–C7 aromatic hydrocarbons comprising benzene, tolueno or mixtures thereof (iv) C8+ aromatic hydrocarbons;
- and, (v) and from 0.2 to about 20 weight percent of non-aromatic C6–C8 hydrocarbons based on the weight of the C6–C7 aromatic hydrocarbons present in the reformate;
- and
- (b) methylating at least a portion of said benzene, toluene, or mixtures thereof present in said reformate in a methylation reaction zone with a methylating agent under vapor phase conditions effective for the methylation and in the presence of an acidic molecular sieve catalyst comprising an intermediate pore size molecular sieve to produce a resulting product having a higher xylenes content than said reformate;
- wherein:
- (I) at least 7 weight percent of the benzene and/or toluene present in said reformate is converted to xylenes;and, (II) at least 50 weight percent of said C6–C8 non-aromatic hydrocarbons present in said reformate are cracked to lower molecular weight products.
5 more elements
Dependencies are inferred from the claim text.