US 2022/0177616 A1Published application

Process and reactor assembly for the enhancement of hydrodynamics in a gas-solids fluidized bed reactor

OwnerGunter Weickert, Vasileios Kanellopoulos +8inventors

InventorsGunter Weickert, Vasileios Kanellopoulos, Eric-Jan Prinsen, Pablo Ivan Aguayo Arellano, Markku Vahteri, Juha Salminen, Jari-Jussi Ruskeeniemi, Ravindra Tupe, Erno Elovainio, Klaus Nyfors

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Abstract

A process for polymerizing olefin monomer(s) in a gas-solids olefin polymerization reactor comprising a top zone; a middle zone, which comprises a top end in direct contact with said top zone and which is located below said top zone, the middle zone having a generally cylindrical shape; and a bottom zone, which is in direct contact with a bottom end of the middle zone and which is located below the middle zone; comprising the following steps: introducing a fluidization gas stream into the bottom zone; polymerizing olefin monomer(s) in the presence of a polymerization catalyst in a dense phase formed by particles of a polymer of the olefin monomer(s) suspended in an upwards flowing stream of the fluidization gas in the middle zone; introducing a jet gas stream through one or more jet gas feeding ports in a jet gas feeding area of the middle zone at the dense phase in the middle zone of the gas-solids olefin polymerization reactor; wherein the kinetic energy (EJG) input in the reactor by the jet stream is between 1.5 and 50 times higher than the kinetic energy (EFG) input in the reactor by the fluidization gas stream (FG).

Claims15

Dependent claims

A process for polymerizing olefin monomer(s) in a gas-solids olefin polymerization reactor comprising:

a top zone (1);
a middle zone (2), which comprises a top end in direct contact with said top zone and which is located below said top zone (1), the middle zone (2) having a generally cylindrical shape;
and
a bottom zone (3), which is in direct contact with a bottom end of the middle zone (2) and which is located below the middle zone (2);
comprising the following steps:
a) introducing a fluidization gas stream (6, FG) into the bottom zone (3);
b) polymerizing olefin monomer(s) in the presence of a polymerization catalyst in a dense phase (4) formed by particles of a polymer of the olefin monomer(s) suspended in an upwards flowing stream of the fluidization gas in the middle zone (2);
c) introducing a jet gas stream (8, JG) through one or more jet gas feeding ports (5) in a jet gas feeding area of the middle zone (2) at the dense phase (4) in the middle zone (2) of the gas-solids olefin polymerization reactor;
wherein
the kinetic energy (EJG) input in the gas-solids olefin polymerization reactor by the jet stream (JG) is between 1.0 and 50 times higher than the kinetic energy (EFG) input in the gas-solids olefin polymerization reactor by the fluidization gas stream (FG) as expressed by relation (I)
1.0
≤
E
JG
E
FG
≤
50
(
I
)
wherein the kinetic energy of the fluidization gas (EFG) is calculated according to equation (II):
E
FG
=
P
FG
·
V
FG
·
ln
⁡
(
P
FG
P
FG
-
h
·
ρ
·
g
)
(
II
)
with
EFG being the energy dissipated by the expansion of the fluidisation gas into the fluidized bed, [W]
PFG being the pressure of the fluidisation gas at the bottom of the gas-solids olefin polymerization reactor, [Pa]
VFG being the volumetric flow rate of the fluidisation gas, [m3/s]
h being the bed height of the collapsed bed, [m]
ρ being the bulk density of the collapsed bed, [kg/m3]
g being the gravity constant, [m/s2]
and wherein the kinetic energy of the jet gas (EJG) is calculated according to equation (III):
E
JG
=
P
JG
·
V
JG
·
ln
⁡
(
V
FG
2
V
JG
)
(
III
)
with
EJG being the energy dissipated by the expansion of the jet gas into the fluidized bed, [W]
PJG being the pressure of the jet gas at entry in the gas-solids olefin polymerization reactor, [Pa]
VFG2 being the volumetric flow rate of the fluidisation gas, [m3/s]
VJG being the volumetric flow rate of the jet gas, [m3/s].

79 more elements

A reactor assembly for polymerizing olefin monomer(s) comprising

a gas-solids olefin polymerization reactor comprising:
a top zone (1);
a middle zone (2), which comprises a top end in direct contact with said top zone (2) and which is located below said top zone (1), the middle zone (2) having a generally cylindrical shape;
and
a bottom zone (3), which is in direct contact with a bottom end of the middle zone (2) and which is located below said middle zone (2);
one or more feeding ports (5) located in a feeding area of the middle zone (2);
a first line (6) for feeding a fluidization gas stream (FG) into the bottom zone (3) of the gas-solids olefin polymerization reactor,
a second line (7) for withdrawing a stream comprising fluidization gas from the top zone (1) of the gas-solids olefin polymerization reactor,
a third line (8) for introducing a jet gas stream (JG) into the middle zone (2) of the gas-solids olefin polymerization reactor via the one or more feeding ports (5), and
means (9) located in the first line (6) for providing kinetic energy to the fluidization gas stream (FG) prior to entry of the gas-solids olefin polymerization reactor and means (10) located in the third line (8) for providing kinetic energy to the jet gas stream (FG) prior to entry of the gas-solids olefin polymerization reactor,
wherein
the means for providing kinetic energy to the fluidization gas stream (9) and the means for providing kinetic energy to the jet gas stream (10) are configured so that the kinetic energy (EJG) input in the gas-solids olefin polymerization reactor by the jet stream (JG) is between 1.0 and 50 times higher than the kinetic energy (EFG) input in the gas-solids olefin polymerization reactor by the fluidization gas stream (FG) as expressed by relation (I)
1.0
≤
E
JG
E
FG
≤
50
(
I
)
wherein the kinetic energy of the fluidization gas (EFG) is calculated according to equation (II):
E
FG
=
P
FG
·
V
FG
·
ln
⁡
(
P
FG
P
FG
-
h
·
ρ
·
g
)
(
II
)
with
EFG being the energy dissipated by the expansion of the fluidisation gas into the fluidized bed, [W]
PFG being the pressure of the fluidisation gas at the bottom of the gas-solids olefin polymerization reactor, [Pa]
VFG being the volumetric flow rate of the fluidisation gas, [m3/s]
h being the bed height of the collapsed bed, [m]
ρ being the bulk density of the collapsed bed, [kg/m3]
g being the gravity constant, [m/s2]
and wherein the kinetic energy of the jet gas (EJG) is calculated according to equation (III):
E
JG
=
P
JG
·
V
JG
·
ln
⁡
(
V
FG
2
V
JG
)
(
III
)
with
EJG being the energy dissipated by the expansion of the jet gas into the fluidized bed, [W]
PJG being the pressure of the jet gas at entry in the gas-solids olefin polymerization reactor, [Pa]
VFG2 being the volumetric flow rate of the fluidisation gas, [m3/s]
VJG being the volumetric flow rate of the jet gas, [m3/S]

81 more elements

Dependencies are inferred from the claim text.