Oxygenated hydrocarbon conversion zoned method

Patent metadata

Field	Value
Publication number	US-10059638-B2
Application number	US-201515555604-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Mar 31, 2015
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

Processes are provided for conversion of oxygenated hydrocarbon, such as methanol and/or dimethyl ether, to aromatics, such as a para-xylene, and olefins, such as ethylene and propylene. The processes entail using a reactor having multiple reaction zones where each zone is prepared to promote desired reactions.

First claim

What is claimed is:

1. An oxygenated hydrocarbon conversion process, comprising:
a) reacting an oxygenated hydrocarbon feed with a first catalyst in a first zone of a reactor to produce a first mixture comprising olefins, paraffins, and aromatics; and
b) reacting the first mixture with a second catalyst in a second zone of the reactor to convert at least a portion of the olefins in the first mixture to aromatics and produce a second mixture comprising olefins, paraffins, and aromatics;
wherein, the aromatics weight concentration in the second mixture is greater than the aromatics weight concentration in the first mixture and the first and second catalysts comprise at least one molecular sieve and at least one transition metal element selected from groups 2-14 of the Periodic Table;
c) reacting the second mixture from step b) with a third catalyst in a third zone of the reactor to convert at least a portion of the paraffins in the second mixture to unsaturated hydrocarbons and produce a third mixture comprising olefins, paraffins, and aromatics, wherein the third catalyst comprises at least one molecular sieve and at least one element selected from groups 2-14 of the Periodic Table;
d) conducting the third mixture away as reactor effluent.

2. The process of claim 1 , wherein the first zone temperature is from 300° C. to 450° C., the second zone temperature is from 400° C. to 550° C., and the third zone is at a temperature greater than 500° C.

3. The process of claim 1 , wherein the first catalyst in the first zone is prepared by steaming the first catalyst in the presence of at least 1 vol% water at a temperature of about 400° C. for at least 0.25 hours prior to executing step (a).

4. The process of claim 1 , wherein the first catalyst and second catalyst are prepared by steaming the first and second catalyst in the presence of at least 1 vol% water at a temperature of about 400° C. for at least 0.25 hours prior to executing step (a).

5. The process of claim 1 , wherein the at least one molecular sieve of the first and second catalyst comprises ZSM-5.

6. The process of claim 5 , wherein the at least one element selected from groups 2-14 of the Periodic Table is one or more selected from the group consisting of Zn, Ga, or Ag.

7. The process of claim 1 , where the reactor is operated at a pressure from 100 kPaa to 2500 kPaa and a weight hourly space velocity from 0.1 hr −1 to 20 hr −1 .

8. The process of claim 1 , wherein the second catalyst has at least >1 wt% more transition metal concentration than the first catalyst.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Soultanidis Nikolaos
• Abichandani Jeevan S
• Shekhar Mayank

Classifications

• C07C5/333

  Catalytic processes · CPC title

• C07C5/415

  with metals · CPC title

• C07C2529/40

  of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11 · CPC title

• C07C1/20 Primary

  starting from organic compounds containing only oxygen atoms as heteroatoms · CPC title

• B01J29/405

  containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead · CPC title