Acid modified red mud as a catalyst for olefin isomerization

Patent metadata

Field	Value
Publication number	US-11427519-B2
Application number	US-202117140242-A
Country	US
Kind code	B2
Filing date	Jan 4, 2021
Priority date	Jan 4, 2021
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A system and a method for isomerizing a 2-butene feed stream to form a 1-butene product stream are provided. An exemplary method includes calcining the red mud, flowing a butene feedstock over the red mud in an isomerization reactor, and separating 1-butene from a reactor effluent.

First claim

What is claimed is:

1. A method for using an acid modified red mud (AMRM) catalyst for olefin isomerization, comprising:
forming the AMRM catalyst by:
dissolving red mud in water to form a red mud solution;
neutralizing the red mud solution with an acid;
forming a precipitant by adding a base to the neutralized red mud solution;
filtering the precipitant from the red mud solution containing the added base;
drying the precipitant;
grinding the dried precipitant to form particles of less than 100 μm; and
calcining the particles to form the AMRM catalyst; and

flowing a butene feedstock comprising 2-butene over the AMRM catalyst in an isomerization reactor to obtain a reactor effluent comprising 1-butene; and
separating 1-butene from the reactor effluent.

2. The method of claim 1 , further comprising calcining the AMRM catalyst to activate the AMRM catalyst at a temperature of between about 400° C. and about 700° C. for between about 2 hours and about 6 hours.

3. The method of claim 1 , further comprising calcining the AMRM catalyst to activate the AMRM catalyst at a temperature of between about 500° C. and about 600° C. for between about 3 hours and about 5 hours.

4. The method of claim 1 , further comprising calcining the AMRM catalyst to activate the AMRM catalyst at a temperature of about 550° C. for about 4 hours.

5. The method of claim 1 , further comprising obtaining the butene feedstock from an upstream purification system in a refinery.

6. The method of claim 1 , comprising obtaining the butene feedstock with a boiling point range of between about −30° C. and about 40° C.

7. The method of claim 1 , comprising obtaining the butene feedstock with a boiling point range of between about −20° C. and about 10° C.

8. The method of claim 1 , comprising obtaining the butene feedstock with a boiling point range of between about −10° C. and about 0° C.

9. The method of claim 1 , further comprising flowing the butene feedstock over the AMRM catalyst at a weight hour space velocity of between about 400 hr −1 and 1300 hr −1 .

10. The method of claim 1 , further comprising flowing the butene feedstock over the AMRM catalyst at a weight hour space velocity of between about 650 hr −1 and 1150 hr −1 .

11. The method of claim 1 , further comprising flowing the butene feedstock over the AMRM catalyst at a weight hour space velocity of about 900 hr −1 .

12. The method of claim 1 , further comprising separating the 1-butene from the reactor effluent in a distillation column.

13. The method of claim 1 , further comprising returning the reactor effluent to an upstream purification system after removal of the 1-butene from the reactor effluent.

14. The method of claim 1 , further comprising combining the reactor effluent with the butene feedstock after separating the 1-butene from the reactor effluent.

Assignees

• Saudi Arabian Oil Co

Inventors

• Fadhel Bandar A
• Albuali Mohammed A
• Khokhar Munir D
• Bamagain Rami

Classifications

• B01J21/12

  Silica and alumina · CPC title

• C07C2521/12

  Silica and alumina · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• C07C5/2512 Primary

  with metal oxides · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title