Process for converting oxygenates to olefins

Patent metadata

Field	Value
Publication number	US-2016257626-A1
Application number	US-201415032815-A
Country	US
Kind code	A1
Filing date	Oct 30, 2014
Priority date	Oct 31, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

A process for converting oxygenates to olefins comprising: a) providing an oxygenate containing stream to an oxygenate to olefins conversion reactor; b) passing the oxygenate containing stream through a feed introduction system comprising one or more nozzles and one or more corresponding caps; c) contacting the oxygenate containing stream with a molecular sieve catalyst in the oxygenate to olefins conversion reactor to form an olefin containing product stream; and d) removing the product stream from the reactor.

First claim

1 . A process for converting oxygenates to olefins comprising:
a. providing an oxygenate containing stream to an oxygenate to olefins conversion reactor; b. passing the oxygenate containing stream through a feed introduction system comprising one or more nozzles and one or more corresponding caps; c. contacting the oxygenate containing stream with a molecular sieve catalyst in the oxygenate to olefins conversion reactor to form an olefin containing product stream; and d. removing the product stream from the reactor.

2 . The process of claim 1 wherein the reactor is a riser reactor, turbulent fluidized bed reactor, fast fluidized bed reactor and/or a combination thereof.

3 . The process of any of claims 1 - 2 wherein the oxygenate containing stream comprises methanol and/or dimethylether.

4 . The process of any of claims 1 - 3 wherein the oxygenate containing stream comprises an olefin co-feed and/or a diluent stream.

5 . The process of claim 4 wherein the diluent stream comprises steam.

6 . The process of any of claims 1 - 5 wherein the oxygenate containing stream is a vapor when introduced into the reactor.

7 . The process of any of claims 1 - 6 wherein the inner surface of the nozzles has an erosion resistant coating.

8 . The process of claim 7 wherein the coating is not refractory.

9 . The process of any of claims 1 - 8 wherein the nozzles are located in and allow feed to pass through the bottom wall of the reactor.

10 . The process of claim 9 wherein the bottom wall of the reactor is insulated to prevent the reactor heat from heating the metal of the bottom wall.

11 . The process of any of claims 1 - 10 wherein the caps are such that at least a portion of the oxygenate containing stream that passes through the nozzles is directed in a direction at or below horizontal.

12 . The process of any of claims 1 - 11 wherein the caps are rounded caps that are positioned above each of the nozzles.

13 . The process of claim 12 wherein the caps are hemispherical, elliptical and/or cylindrical caps that are positioned above each of the nozzles.

14 . The process of any of claims 1 - 13 wherein the caps are coated with an erosion resistant coating.

15 . The process of claim 14 wherein the caps are coated with a coating selected from the group consisting of ceramics, fire brick, high temperature calcium silicate, alumina, silica-alumina ceramics, diatomaceous silica brick, carbide, cement or refractory.

16 . The process of any of claims 1 - 15 wherein the molecular sieve catalyst is a zeolite catalyst.

17 . The process of claim 16 wherein the molecular sieve catalyst comprises ZSM-5.

18 . The process of any of claims 1 - 17 further comprising passing the product stream through downstream processing equipment to separate the products from other components in the product stream.

19 . The process of any of claims 1 - 18 wherein the nozzle is made of carbon steel.

20 . The process of any of claims 1 - 19 wherein the caps are made of carbon steel.

21 . A system for converting oxygenates to olefins comprising:
a. an oxygenate to olefins conversion reactor; b. one or more catalyst inlets for introducing catalyst into the reactor; c. one or more feed inlet nozzles located at the bottom of the reactor for introducing an oxygenate containing feed into the reactor; and d. one or more protective caps located above each of the feed inlet nozzles.

22 . The system of claim 21 wherein the catalyst is fresh catalyst, recycled catalyst, regenerated catalyst or a combination thereof.

23 . The system of any of claims 21 - 22 wherein the inner surface of the nozzles has an erosion resistant coating.

24 . The system of claim 23 wherein the coating is not refractory.

25 . The system of any of claims 21 - 24 wherein the caps are rounded caps that are positioned above each of the nozzles.

26 . The system of claim 25 wherein the caps are hemispherical, elliptical and/or cylindrical caps that are positioned above each of the nozzles.

27 . The system of any of claims 21 - 26 wherein the caps are coated with an erosion resistant coating.

28 . The system of claim 27 wherein the caps are coated with a coating selected from the group consisting of ceramics, fire brick, high temperature calcium silicate, alumina, silica-alumina ceramics, diatomaceous silica brick, carbide, cement or refractory.

29 . The system of any of claims 21 - 28 wherein the nozzles are made of carbon steel.

30 . The system of any of claims 21 - 29 wherein the caps are made of carbon steel.

31 . A feed introduction system for an oxygenates to olefins conversion system comprising:
a. one or more feed inlet nozzles located in the bottom of an oxygenate to olefins conversion reactor; and b. one or more protective caps located above each of the feed inlet nozzles.

32 . The system of claim 31 wherein the inner surface of the nozzles has an erosion resistant coating.

33 . The system of any of claims 31 - 32 wherein the coating is not refractory.

34 . The system of any of claims 31 - 33 wherein the caps are rounded caps that are positioned above each of the nozzles.

35 . The system of claim 34 wherein the caps are hemispherical, elliptical and/or cylindrical caps that are positioned above each of the nozzles.

36 . The system of any of claims 31 - 35 wherein the caps are coated with an erosion resistant coating.

37 . The system of claim 36 wherein the caps are coated with a coating selected from the group consisting of ceramics, fire brick, high temperature calcium silicate, alumina, silica-alumina ceramics, diatomaceous silica brick, cement or refractory.

38 . The system of any of claims 31 - 37 wherein the nozzles are made of carbon steel.

39 . The system of any of claims 31 - 38 wherein the caps are made of carbon steel.

Assignees

• Shell Oil Co

Inventors

• Sanborn Richard Addison
• Sadasivan Vijayakumari Sivakumar
• Chewter Leslie Andrew
• Chen Ye-Mon

Classifications

• C07C2529/00

  Catalysts comprising molecular sieves · CPC title

• C07C1/20 Primary

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

• B01J8/24

  according to "fluidised-bed" technique (B01J8/20 takes precedence) · CPC title

• B01J2208/00902

  Nozzle-type feeding elements · CPC title

• Y02P30/20

  using bio-feedstock · CPC title