Propylene plant revamping process

2:

• The method of claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line.

3:

• The method of claim 1 wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, comprising:
• providing a product discharge vessel downstream of the new gas-phase reactor and upstream of the product receiver tank.

4:

• The method of claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, and wherein the product receiver tank is coupled to said distillation column with a compressor between.

5:

• The method of claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, and wherein distillation column is coupled to a reflux recovery feed vessel, wherein said reflux recovery feed vessel is coupled with the vapour recovery line.

6:

• The method of claim 1, wherein the transition from the existing polypropylene plant to the revamped polypropylene plant does not involve a shutdown of more than 24 hours.

7:

• The method of claim 1, for increasing the once-through conversion, and/or increasing the catalyst mileage and/or increasing the throughput of an existing polypropylene plant.

8:

• The method of claim 1, wherein a gas circulation line or alternatively a gas circulation line as well as a vapour recovery line is present and wherein the gas circulation line or alternatively the gas circulation line is coupled with the vapour recovery line.

9:

• The method of claim 1, wherein the revamped propylene polymerization plant is suitable for producing random polypropylene copolymer and/or polypropylene homopolymer.

10:

• The method of claim 1, wherein the new gas-phase reactor has a capacity of 0.9×tons-1.2×tons per hour.

11:

• The method of claim 1, wherein no flash stage is present downstream of the loop reactor(s) and upstream of the new gas phase reactor.

12:

• The method according to claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, and wherein the method further comprises providing a product discharge vessel downstream of the new gas-phase reactor and upstream of the product receiver tank, wherein further the product receiver tank is coupled to said distillation column with a compressor between, and wherein said distillation column is coupled to a reflux recovery feed vessel, wherein said reflux recovery feed vessel is coupled with the vapour recovery line.

13-15. (canceled)

16:

• A method for increasing the once-through conversion with respect to the once-through conversion of existing polypropylene plant by using the method according to claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, and wherein the method further comprises providing a product discharge vessel downstream of the new gas-phase reactor and upstream of the product receiver tank, wherein further the product receiver tank is coupled to said distillation column with a compressor between, and wherein said distillation column is coupled to a reflux recovery feed vessel, wherein said reflux recovery feed vessel is coupled with the vapour recovery line.

17:

• A method for increasing catalyst mileage by using the method according to claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, and wherein the method further comprises providing a product discharge vessel downstream of the new gas-phase reactor and upstream of the product receiver tank, wherein further the product receiver tank is coupled to said distillation column with a compressor between, and wherein said distillation column is coupled to a reflux recovery feed vessel, wherein said reflux recovery feed vessel is coupled with the vapour recovery line.

18:

• A method for increasing the throughput of an existing propylene polymerization plant by using the method according to claim 1, wherein the deactivation and degassing unit downstream of the new gas-phase reactor includes a product receiver tank, a purge bin, a propylene nitrogen recovery unit, a distillation column and a vapour recovery line, and wherein the method further comprises providing a product discharge vessel downstream of the new gas-phase reactor and upstream of the product receiver tank, wherein further the product receiver tank is coupled to said distillation column with a compressor between, and wherein said distillation column is coupled to a reflux recovery feed vessel, wherein said reflux recovery feed vessel is coupled with the vapour recovery line for increasing the once-through conversion with respect to the once-through conversion of existing polypropylene plant.