Acid modified red mud as a catalyst for olefin isomerization

Patent metadata

Field	Value
Publication number	US-2022213008-A1
Application number	US-202117140242-A
Country	US
Kind code	A1
Filing date	Jan 4, 2021
Priority date	Jan 4, 2021
Publication date	Jul 7, 2022
Grant date	—

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 red mud solution;
filtering the precipitant from the red mud solution;
drying the precipitant;
grinding the precipitant to form particles of less than 100 μm; and
calcining the particles to form the AMRM catalyst; and
flowing a butene feedstock over the AMRM catalyst in an isomerization reactor; and separating 1-butene from a 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.

15 . A method of making an acid modified red mud (AMRM) catalyst for olefin isomerization, comprising:
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 red mud solution; filtering the precipitant from the red mud solution; drying the precipitant; calcining the precipitant; and grinding the precipitant to form the AMRM catalyst with a particle size of less than 100 μm.

16 . The method of claim 15 , further comprising dissolving the red mud in the water at a concentration of about 10 wt. %.

17 . The method of claim 15 , further comprising adding the acid until the pH of the red mud solution is less than 7.

18 . The method of claim 15 , further comprising adding the base until the pH of the red mud solution is greater than 8.

19 . The method of claim 15 , further comprising drying the precipitant at a temperature of greater than about 100° C. for at least about 8 hours.

20 . The method of claim 15 , further comprising calcining the precipitant at a temperature of between about 500° C. and about 800° C. for between about 2 hours and about 6 hours.

21 . The method of claim 15 , further comprising calcining the precipitant at a temperature of between about 600° C. and about 700° C. for between about 3 hours and about 5 hours.

22 . The method of claim 15 , further comprising calcining the precipitant at a temperature of about 600° C. for about 4 hours.

23 . An isomerization unit for producing a 1-butene product stream from a butene feedstock, comprising:
an upstream purification system to separate a feed stream that comprises trans-2-butene and cis-2-butene from an initial feedstock, generating the butene feedstock; a reactor comprising an acid modified red mud (AMRM) catalyst to isomerize the trans-2-butene and cis-2-butene to form 1-butene; and a product purification system to isolate the 1-butene product stream from an effluent from the reactor.

24 . The isomerization unit of claim 23 , wherein the butene feedstock has a boiling point range of about −20° C. to about 10° C.

25 . The isomerization unit of claim 23 , wherein the product purification system comprises a distillation column configured to recycle the effluent to the upstream purification system, after removal of the 1-butene product stream.

Assignees

• Saudi Arabian Oil Co

Inventors

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

Classifications

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title

• B01J21/04

  Alumina · CPC title

• B01J37/031

  Precipitation · CPC title