Fixed bed reactors and processes for dehydration of alcohols

Patent metadata

Field	Value
Publication number	US-2025034062-A1
Application number	US-202418771535-A
Country	US
Kind code	A1
Filing date	Jul 12, 2024
Priority date	Jul 14, 2023
Publication date	Jan 30, 2025
Grant date	—

Abstract

The disclosure provides a method of converting an alcohol into an olefin. The method includes passing a first fluid comprising the alcohol through a plurality of reactors. Each reactor includes a catalyst bed. During a catalyst campaign for at least one of the plurality of reactors, the corresponding catalyst bed includes a catalytic-active zone that is at least 90% of the catalyst bed. Additionally, the disclosure provides a system for converting an alcohol into an olefin.

First claim

1 . A method of converting an alcohol into an olefin, the method comprising:
passing a first fluid comprising the alcohol through a plurality of reactors, each reactor comprising a catalyst bed, wherein, during a catalyst campaign for at least one of the plurality of reactors, the corresponding catalyst bed includes a catalytic-active zone that is at least 90% of the catalyst bed.

2 . The method of claim 1 , wherein the catalytic-active zone is 100% of the catalyst bed during the catalyst campaign.

3 . The method of claim 1 , wherein at least one of the catalyst beds further includes an idle catalyst zone that is less than 10% of the catalyst bed during the catalyst campaign, and/or
wherein the catalytic-active zone operates at a temperature of 280° C. to 500° C.

4 . The method of claim 1 , wherein at least one of the catalyst beds does not include an idle catalyst zone during the catalyst campaign.

5 - 6 . (canceled)

7 . The method of claim 1 ,
wherein the alcohol comprises at least one of a C 2 alcohol, a C 3 alcohol, and a C 4 alcohol, and/or wherein the olefin comprises an alkene having the same number of carbons atoms as the alcohol, and/or wherein the olefin comprises ethylene, and the catalytic-active zone operates at a temperature of 360° C. to 470° C.

8 - 9 . (canceled)

10 . The method of claim 1 , further comprising:
contacting the first fluid with a second fluid comprising steam prior to the first fluid contacting the plurality of reactors, wherein a ratio of the steam to the alcohol is from 1:1 to 3:1, obtaining a third fluid from at least one of the plurality of reactors, wherein the third fluid comprises the alcohol at a concentration lower than a concentration of the alcohol in the first fluid, contacting the third fluid with the first fluid prior to contacting the third fluid with another reactor among the plurality of reactors, and obtaining from an end of the plurality of reactors, a fourth fluid comprising the olefin and an alkane that has the same number of carbon atoms, wherein an amount of the olefin in the fourth fluid is at least 1,000 ppm, mole basis, greater than an amount of the alkane.

11 . The method of claim 10 , wherein an amount of the alkane in the fourth fluid is 2,500 ppm or less.

12 . The method of claim 10 , further comprising pressurizing the fourth fluid with a one-stage compressor connected to an end of the plurality of reactors, and/or
wherein the method excludes pressurizing the fourth fluid with a multi-stage compressor.

13 . (canceled)

14 . The method of claim 10 , further comprising feeding the first fluid to at least one of the plurality of reactors at a temperature more than 280° C.

15 . The method of claim 14 , wherein the temperature is more than 400° C.

16 . (canceled)

17 . The method of claim 1 , wherein the plurality of reactors is in a series-parallel arrangement, and/or
wherein at least one of the plurality of reactors has a weight hourly space velocity of the alcohol of more than 0.6/h and up to 1.5/h.

18 - 19 . (canceled)

20 . The method of claim 1 , wherein the plurality of reactors comprises:
a first group of reactors including reactors each having a first height, and a second group of reactors including reactors each having a second height, wherein the first height is different from the second height.

21 . The method of claim 1 , wherein the plurality of reactors comprises, in order:
a first reactor comprising a first catalyst bed, a second reactor comprising a second catalyst bed, a third reactor comprising a third catalyst bed, and a fourth reactor comprising a fourth catalyst bed.

22 . The method of claim 21 , wherein the plurality of reactors further comprises, after the fourth reactor, a fifth reactor comprising a fifth catalyst bed, and/or
wherein a variance between a height of each of the plurality of reactors is no more than 15%.

23 . (canceled)

24 . The method of claim 22 , wherein a variance between a height of each of the plurality of reactors is no more than 10%, and/or
wherein each of the plurality of reactors independently has a height of from 2.5 m to 4.0 m, and/or wherein the first reactor has a height of 2.8 to 3.1 m, and/or wherein the third reactor has a height of 3.2 to 3.5 m, and/or wherein the first and second reactors have the same height, and/or wherein the remaining reactors have a height different from the first and second reactors, and/or wherein each of the third and fourth reactors has a height that is 10% to 50% greater than the height of the first reactor, and/or wherein the fifth reactor has a height that is 10% to 50% greater than the height of the first reactor, and/or wherein the third to fifth reactors have the same height.

25 - 32 . (canceled)

33 . The method of claim 22 , wherein the fourth and fifth reactors have the same volume, and/or
wherein a volume of each of the first to fourth reactors increases from the first reactor to the fourth reactor.

34 . (canceled)

35 . The method of claim 22 , wherein a variance between a height of each of the catalyst beds is no more than 15%, and/or
wherein each of the catalyst beds independently has a height of from 2.0 m to 2.8 m, and/or wherein the first catalyst bed has a height of 2.0 m to 2.2 m, and/or wherein the third catalyst bed has a height of 2.3 m to 2.6 m, and/or wherein the first and second catalyst beds have the same height, and/or wherein the third and fourth catalyst beds have a height different from the first and second catalyst bed, and/or wherein each of the third and fourth catalyst beds has a height that is 10% to 50% greater than the height of the first catalyst bed, and/or wherein the fifth catalyst bed has a height that is 10% to 50% greater than the height of the first catalyst bed, and/or wherein the fourth and fifth catalyst beds have the same height.

36 - 43 . (canceled)

44 . The method of claim 22 , wherein the fourth and fifth catalyst beds have the same volume, and/or
wherein a volume of the catalyst beds increases from the first catalyst bed to the fourth catalyst bed.

45 . (canceled)

46 . The method of claim 1 , wherein at least one of the plurality of reactors is fluidly coupled to a furnace to form a furnace-reactor couple.

47 . The method of claim 46 , further comprising passing the first fluid through the furnace before the first fluid enters the reactor in the same furnace-reactor couple.

48 . The method of claim 46 , wherein the furnace-reactor couple comprises a single furnace and a single reactor, a plurality of the furnace-reactor couples is present, each of the furnace-reactor couples is fluidly coupled to each other, and at least one of the plurality of the furnace-reactor couples is a spare furnace-reactor couple.

49 - 50 . (canceled)

51 . The method of claim 48 , wherein the spare furnace-reactor couple includes a reactor that has the same height and/or volume as another reactor in another furnace-reactor couple among the plurality of the furnace-reactor couples, and/or
wherein the spare furnace-reactor couple includes a reactor that has the same height and/or volume as another reactor in another furnace-reactor couple immediately preceding the spare furnace-reactor co

Assignees

• Braskem Sa

Inventors

• Vieira Monica Albers
• Moura Adler Gomes
• Oliveira Andrea Marins

Classifications

• B01J2208/021

  comprising a plurality of beds with flow of reactants in parallel · CPC title

• B01J2208/00761

  Discharging · CPC title

• B01J2208/00504

  by means of a burner · CPC title

• B01J8/0496

  Heating or cooling the reactor · CPC title

• B01J8/0492

  Feeding reactive fluids (for solid material, see B01J8/0015) · CPC title