Process for regenerating a catalyst
View Patent ↗The invention relates to a process for regenerating catalysts containing mixed oxides from the group of alkali metal and/or alkaline earth metal oxides, aluminium oxide and silicon oxide, characterized in that the regeneration comprises the following features: i) treatment of the catalyst in situ, ii) contacting of the catalyst with water, iii) treatment of the catalyst within a temperature range from 100 to 400° C., iv) treatment of the catalyst within a pressure range from 0.1 to 2 MPa, v) treatment of the catalyst over a period of 0.1 to 24 h, vi) treatment of the catalyst with a specific catalyst hourly space velocity of 0.1 to 100 h −1 .
1. A process comprising:
gas phase cleaving methyl tert-butyl ether to isobutene and methanol over a catalyst installed in a reactor, and
subsequently regenerating the catalyst in situ by contacting the catalyst with steam within a temperature range from 100 to 400° C. and a pressure range from 0.1 to 2 MPa, over a period of 0.1 to 24 h, with a specific catalyst hourly space velocity of 0.1 to 100 h −1 ,
wherein the methyl tert-butyl ether is evaporated before entry into the reactor as a feedstream,
wherein the feedstream of methyl tert-butyl ether is shutdown before the regeneration of the catalyst, and
wherein the catalyst comprises:
at least one of an alkali metal oxide and an alkaline earth metal oxide, and
at least one of aluminum oxide and silicon oxide.
2. The process of claim 1 , wherein the temperature range of the regeneration with steam is from 150 to 380° C.
3. The process of claim 1 , wherein the temperature range of the regeneration with steam is from 200 to 350° C.
4. The process of claim 1 , wherein the pressure range of the regeneration with steam is from 0.2 to 1 MPa.
5. The process of claim 1 , wherein the treatment time is from 1 to 10 h.
6. The process of claim 1 , wherein the treatment time is from 2 to 6 h.
7. The process of claim 1 , wherein the specific catalyst hourly space velocity is from 0.5 to 30 h −1 .
8. The process of claim 2 , wherein the pressure range is from 0.2 to 1 MPa.
9. The process of claim 3 , wherein the pressure range is from 0.2 to 1 MPa.
10. The process of claim 2 , wherein the regeneration period is from 1 to 10 h.
11. The process of claim 3 , wherein the regeneration period is from 1 to 10 h.
12. The process of claim 2 , wherein the regeneration period is from 2 to 6 h.
13. The process of claim 3 , wherein the regeneration period is from 2 to 6 h.
14. The process of claim 4 , wherein the regeneration period is from 2 to 6 h.
15. The process of claim 2 , wherein the specific catalyst hourly space velocity is from 0.5 to 30 h −1 .
16. The process of claim 3 , wherein the specific catalyst hourly space velocity is from 0.5 to 30 h −1 .
17. The process of claim 4 , wherein the specific catalyst hourly space velocity is from 0.5 to 30 h −1 .
18. The process of claim 4 , wherein the specific catalyst hourly space velocity is from 1 to 10 h.
19. The process of claim 5 , wherein the specific catalyst hourly space velocity is from 0.5 to 30 h −1 .
20. The process of claim 6 , wherein the specific catalyst hourly space velocity is from 0.5 to 30h −1 .