High meso-surface area and high acid site density pentasil zeolite for use in xylene conversion

Patent metadata

Field	Value
Publication number	US-9890094-B2
Application number	US-201514636624-A
Country	US
Kind code	B2
Filing date	Mar 3, 2015
Priority date	Mar 3, 2015
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

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:

M m n+ R 1 r1 p 1 + R 2 r2 p 2 + Al 1-x E x Si y O z

where M is an alkali, alkaline earth, or rare earth metal such as sodium and/or potassium, R 1 and R 2 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.

First claim

What is claimed is:

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 para-xylene;
wherein the isomerization catalyst is characterized by a UZM-54 zeolite having a microporous crystalline structure comprising a framework of AlO 2 and SiO 2 tetrahedral units, and an empirical composition in the as synthesized and anhydrous basis expressed by the empirical formula of:

M
m

n
+

⁢

R

1

r
1

p
1

+

⁢

R

2

r
2

p
2

+

⁢

AlSi
y

⁢

O
z

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, R 1 is at least one organoammonium cation selected from the group consisting of quaternary ammonium cations and diquaternary ammonium cations, “r 1 ” is the mole ratio of R 1 to Al and has a value of about 0.1 to about 3.0, R 2 is at least one organoammonium cation selected from the group consisting of protonated alkanolamines, protonated amines, protonated diamines, and quaternized alkanolammonium cations, “r 2 ” is the mole ratio of R 2 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, “p 1 ” is the weighted average valence of R 1 and has a value of about 1 to about 2, “p 2 ” is the weighted average valence of R 2 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+r 1 ·p 1 +r 2 ·p 2 +3+4 ·y )/2

and 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, wherein w=5.8-13.4, m=20.6-56.4, s=71.7-77.7, and vs=90.0-100.0:

2Θ
d(Å)
I/Io

7.91-8.05
10.83-11.16
vs

8.84-9.01
9.80-9.99
s

14.87-14.91
5.93-5.95
w

15.91-16.12
5.49-5.56
w

20.41-20.59
4.31-4.34
w

20.82-20.94
4.25-4.43
w

23.25-23.61
3.76-3.82
vs

23.84-23.92
3.71-3.72
m

24.35-24.75
3.59-3.65
m

26.80-26.95
3.30-3.32
w

29.33-29.46
3.02-3.04
w

30.01-30.13
2.96-2.97
w.

2. The process of claim 1 wherein the isomerization reaction conditions include a temperature between 190° C. and 350° C.

3. The process of claim 2 wherein the isomerization reaction conditions include a temperature between 220° C. and 270° C.

4. The process of claim 1 wherein the isomerization reaction conditions include a pressure sufficient to maintain the reaction mixture in the liquid phase.

5. The process of claim 1 wherein the isomerization reaction conditions include a pressure of at least 1025 kPa.

6. The process of claim 1 wherein the mixture of hydrocarbons further includes ethylbenzene.

7. The process of claim 1 where M in the zeolite is selected from the group consisting of lithium, sodium, potassium, cesium, strontium, calcium, barium and mixtures thereof.

8. The process of claim 1 where M in the zeolite is a mixture of an alkali metal and an alkaline earth metal.

9. The process of claim 1 where R 1 in the zeolite is selected from the group consisting of dimethyldipropylammonium, diethyldipropylammonium, propyltrimethylammonium, and mixtures thereof.

10. The process of claim 1 where R 2 in the zeolite is selected from the group consisting of N-methylethanolamine, 2-dimethylaminoethanol, N-methyldiethanolamine, 2-diethylamino ethanol, 2-isopropylamino ethanol, 2-diisopropylamino ethanol, 3-dimethylamino propanol and 2-aminopropanol and mixtures thereof.

11. The processs of claim 1 wherein the catalyst is characterized by a zeolite having a microporous crystalline structure comprising a framework of AlO 2 and SiO 2 tetrahedral units, further including the element E and having the empirical composition in the as synthesized and anhydrous basis expressed by the empirical formula of:

M
m

n
+

⁢

R

1

r
1

p
1

+

⁢

R

2

r
2

p
2

+

⁢

Al

Assignees

• Uop Llc

Inventors

• Kuzmanich Gregory B
• Moscoso Jaime G
• Jan Deng Yang

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/77

  Compounds characterised by their crystallite size · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• C07C5/2708

  with crystalline alumino-silicates, e.g. molecular sieves · CPC title

• C01B39/36

  Pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11 · CPC title