| 摘要 |
A process for the production of para-xylene is presented. The process includes the isomerization of C8 aromatics to para-xylene utilizing a new catalyst. The new catalyst and designated as UZM-54 is represented by the empirical composition in the as synthesized and anhydrous basis expressed by the empirical formula of:;Mmn+R1 r1p1+R2 r2p2+Al1-xExSiyOz ;where M is an alkali, alkaline earth, or rare earth metal such as sodium and/or potassium, R1 and R2 are organoammonium cation and E is a framework element such as gallium, iron, boron, or indium. UZM-54 are characterized by unique x-ray diffraction patterns, high meso surface area, low Si/Al ratios. |
| 主权项 |
1. A process for the production of para-xylene, comprising:
passing a mixture of hydrocarbons comprising xylenes to an isomerization reactor, operated at isomerization reaction conditions, to form a reaction mixture over an isomerization catalyst, and to generate an effluent stream comprising p-xylene; wherein the isomerization catalyst is characterized by a zeolite having a microporous crystalline structure comprising a framework of AlO2 and SiO2 tetrahedral units, and an empirical composition in the as synthesized and anhydrous basis expressed by the empirical formula of:
Mmn+R1 r1p1+R2 r2p2+AlSiyOz where M is at least one exchangeable cation selected from the group consisting of alkali and alkaline earth metals, “m” is the mole ratio of M to Al and varies from about 0 to about 1, R1 is at least one organoammonium cation selected from the group consisting of quaternary ammonium cations, diquaternary ammonium cations, “r1” is the mole ratio of R1 to Al and has a value of about 0.1 to about 3.0, R2 is at least one organoammonium cation selected from the group consisting of protonated alkanolamines, protonated amines, protonated diamines, and quaternized alkanolammonium cations, “r2” is the mole ratio of R2 to Al and has a value of about 0 to about 3.0, “n” is the weight average valence of M and has a value of about 1 to about 2, “p1” is the weighted average valence of R1 and has a value of about 1 to about 2, “p2” is the weighted average valence of R2 and has a value of about 1 to about 2, “y” is the mole ratio of Si to Al and varies from greater than 11 to about 30 and “z” is the mole ratio of O to Al and has a value determined by the equation:
z=(m·n+r1·p1+r2·p2+3+4·y)/2and it is characterized in that it has the x-ray diffraction pattern having at least the d spacing and intensities set forth in the following Table:2Θd(Å)I/Io7.91-8.0510.83-11.16vs8.84-9.019.80-9.99vs14.87-14.915.93-5.95w-m15.51-15.655.65-5.70w15.91-16.125.49-5.56w20.41-20.594.31-4.34w20.82-20.944.25-4.43w23.25-23.613.76-3.82vs23.84-23.923.71-3.72m24.35-24.753.59-3.65m26.80-26.953.30-3.32w29.33-29.463.02-3.04w30.01-30.132.96-2.97w30.32-30.322.94-2.94w |
