US2018194867A1PendingUtilityA1
Continuous synthesis method for a modified diene elastomer, facility for implementing same
Est. expiryAug 8, 2033(~7 yrs left)· nominal 20-yr term from priority
B01J 19/245B01J 2219/00033B01J 19/2415C08C 19/25B01J 2219/24B01J 19/18C08C 19/44B01J 19/1862C08L 15/00C08F 236/10
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Claims
Abstract
A system for the continuous synthesis of a modified diene elastomer is provided. The system comprises a device for modifying a living diene elastomer resulting from an anionic polymerization step, modelled on one of the following models: 1. a tubular reactor with axial dispersion, 2. a tubular reactor with axial dispersion, in series with at least one continuous stirred reactor, presumed to be perfectly stirred, 3. at least one tubular reactor with axial dispersion, in series with a continuous stirred reactor, presumed to be perfectly stirred, 4. several tubular reactors with axial dispersion, in series with several continuous stirred reactors, presumed to be perfectly stirred, 5. at least two continuous stirred reactors, presumed to be perfectly stirred, in series.
Claims
exact text as granted — not AI-modified1 . A system for the continuous synthesis of a modified diene elastomer, comprising
a device for modifying a living diene elastomer resulting from an anionic polymerization step, modelled on one of the following models: 1. a tubular reactor with axial dispersion, 2. a tubular reactor with axial dispersion, in series with at least one continuous stirred reactor, presumed to be perfectly stirred, 3. at least one tubular reactor with axial dispersion, in series with a continuous stirred reactor, presumed to be perfectly stirred, 4. several tubular reactors with axial dispersion, in series with several continuous stirred reactors, presumed to be perfectly stirred, 5. at least two continuous stirred reactors, presumed to be perfectly stirred, in series.
2 . A system according to claim 1 , wherein the device is modelled on a tubular reactor with axial dispersion.
3 . A system according to claim 1 , wherein the device is modelled on a tubular reactor with axial dispersion, in series with at least one continuous stirred reactor.
4 . A system according to claim 3 , wherein the at least one continuous stirred reactor is perfectly stirred.
5 . A system according to claim 1 , wherein the device is modelled on at least one tubular reactor with axial dispersion, in series with a continuous stirred reactor.
6 . A system according to claim 5 , wherein continuous stirred reactor is perfectly stirred.
7 . A system according to claim 1 , wherein the device is modelled on several tubular reactors with axial dispersion, in series with several continuous stirred reactors.
8 . A system according to claim 7 , wherein the several continuous stirred reactors are perfectly stirred.
9 . A system according to claim 1 , wherein the device is modelled on at least two continuous stirred reactors, in series.
10 . A system according to claim 9 , wherein the at least two continuous stirred reactors are perfectly stirred.
11 . A unit for the continuous preparation of a modified diene elastomer, wherein the unit incorporates the system according to claim 1 and in that the modifying device is in contact downstream with a device for recovering the diene elastomer.
12 . A system for the continuous synthesis of a modified diene elastomer, comprising a device for modifying a living diene elastomer resulting from an anionic polymerization step, modelled on one of the following models:
1. a tubular reactor with axial dispersion, 2. a tubular reactor with axial dispersion, in series with at least one continuous stirred reactor, 3. at least one tubular reactor with axial dispersion, in series with a continuous stirred reactor, 4. several tubular reactors with axial dispersion, in series with several continuous stirred reactors, 5. at least two continuous stirred reactors, in series, and
wherein the system is used for the implementation of a method for the continuous synthesis of a modified diene elastomer, comprising the steps:
of anionic polymerization of at least one conjugated diene monomer in the presence of a polymerization initiator,
of modifying the diene elastomer in a functionalizing device, by bringing the living diene elastomer bearing an active site obtained in the previous step into contact, in a single step, with a non-polymerizable functionalizing agent comprising (a) where appropriate, a function capable of interacting with a reinforcing filler and (b) a trialkoxysilane group, the optionally hydrolysable alkoxy radical having 1 to 10 carbon atoms,
the modification comprising three reactions in series
Reaction
Mechanism
R1
PLi + A k 1 fi PA
R2
PLi + PA k 2 fi P 2 A
R3
PLi + P 2 A k 3 fi P 3 A
where
A represents the functionalizing agent,
PLi represents a living elastomer chain,
PA represents the chain-end functionalized elastomer,
P 2 A represents the coupled elastomer,
P 3 A represents the three-arm star-shaped elastomer, and
k i represents the rate constant of the reaction R i , that are carried out according to the following rate law:
Reactions
Rate of reaction
R1
V 1 = k 1 [PLi][A]
R2
V 2 = k 2 [PLi][PA]
R3
V 3 = k 3 [PLi][P 2 A]
where
k 1 , k 2 and k 3 are the rate constants respectively of the reactions R1, R2 and R3 (expressed in (m 3 /mol)·s −1 ),
[PLi] is the concentration of living chains (expressed in mol/m 3 ),
[A] is the concentration of modifying agent A (expressed in mol/m 3 ),
[PA] is the concentration of chain-end functionalized helastomer (expressed in mol/m 3 ),
[P 2 A] is the concentration of coupled elastomer (expressed in mol/m 3 ),
[P 3 A] is the concentration of the three-arm star-shaped elastomer (expressed in mol/m 3 ),
with a ratio of the rate constants, defined as:
K
=
k
1
k
2
=
k
2
k
3
,
of greater than 1, and
the residence time distribution in a functionalizing device (i) or (ii) is expressed respectively according to equations 1 or 3 below:
(i) in a functionalizing device having at least one tubular continuous reactor or having at least one cascade of at least two stirred reactors,
E
1
(
t
)
=
1
2
(
P
πθ
1
t
)
1
2
e
-
P
(
θ
1
-
t
)
2
4
θ
1
t
Eq
1
in which:
P is the dimensionless parameter of resistance to dispersion,
θ 1 is the residence time defined as the reactor volume/total volume flow rate ratio,
t is the variable time of the residence time distribution,
(ii) in a functionalizing device that is a combination of the device (i) and of a device having at least one continuous stirred reactor, having a residence time distribution characterized by the following equation:
E
2
(
t
)
=
e
(
-
t
θ
2
)
θ
2
Eq
2
in which:
θ 2 is the residence time defined as the reactor volume/total volume flow rate ratio,
t is the variable time of the residence time distribution,
the device (ii) having a residence time distribution characterized by the equation 3 below, which is the result of the convolution of equations 1 and 2:
E
12
(
t
)
=
∫
0
t
E
1
(
t
-
T
)
E
2
(
T
)
dT
E
12
(
t
)
=
∫
0
t
1
2
(
P
πθ
1
(
t
-
T
)
)
1
2
e
-
P
(
θ
1
-
(
t
-
T
)
)
2
4
θ
1
(
t
-
T
)
e
(
-
T
θ
2
)
θ
2
dT
Eq
3
in which:
θ 1 and θ 2 are the residence times as defined above,
P is the dimensionless parameter of resistance to dispersion,
t is the variable time of the residence time distribution,
T is the integration variable.
13 . A system according to claim 12 , wherein θ 1 is at least 0.1 minute and at most 10 minutes.
14 . A system according to claim 13 , wherein θ 1 is at most 5 minutes.
15 . A system according to claim 12 , wherein θ 2 is between 0 and 60 minutes.
16 . A system according to claim 15 , wherein θ 2 is between 5 and 50 minutes.Join the waitlist — get patent alerts
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