CPC C08G 63/672 (2013.01) [C08G 63/183 (2013.01); C08G 63/785 (2013.01)] | 17 Claims |
1. A method for the combined production of at least two target products selected from the group consisting of (T1), (T2) and (T3), wherein
(T1) is a terephthalate polyester,
(T2) is a copolyester on the basis of terephthalic acid, at least one aliphatic 1,ω-dicarboxylic acid, and at least one aliphatic 1,ω-diol, and
(T3) is a copolyester on the basis of terephthalic acid, polytetramethylene glycol, and at least one aliphatic 1,ω-diol,
in a plant comprising
a first container (B1), a second container (B2), a third container (B3), and a main reactor (HR), wherein
the main reactor (HR) comprises a first main reactor unit (R1), a third main reactor unit (R3), and optionally a second main reactor unit (R2) and, wherein
a pipe (1) connects the first container (B1) to the main reactor units (R1), (R3), and optionally (R2), wherein
pipe (1) is divided into pipes (1a), (1c), and optionally (1b), wherein
pipe (1a) is connected to an inlet of the first main reactor unit (R1), pipe (1c) is connected to an inlet of the third main reactor unit (R3), and optionally, pipe (1b) is connected to an inlet of the second main reactor unit (R2), wherein
a pipe (6a) is connected to an outlet of the first main reactor unit (R1), a pipe (6c) is connected to an outlet of the third main reactor unit (R3), and optionally, a pipe (6b) is connected to an outlet of the second main reactor unit (R2), wherein
the second container (B2) can be connected to the inlet of the first main reactor unit (R1) via a pipe (2), wherein the pipe (2) is connected to pipe (1a), and
the third container (B3) can be connected to the first container (B1) via a pipe (3a) and a pipe (3c),
the method comprising
a) providing at least one first oligomer composition (OC1) comprising at least one first oligomer (O1) obtained by a condensation reaction of terephthalic acid and at least one aliphatic 1,ω-diol in the first container (B1),
b) providing at least one second oligomer composition (CO2) comprising at least one second oligomer (O2) obtained by a condensation reaction of at least one aliphatic 1,ω-dicarboxylic acid and at least one aliphatic 1,ω-diol in the second container (B2),
c) providing at least one third oligomer composition (OC3) comprising at least one third oligomer (O3) obtained by a polymerization of tetra methylene oxide in the third container (B3),
d) performing alternatingly at least two of the following operation modes selected from the group consisting of (PT1), (PT2), and (PT3):
(PT1) production of target product (T1):
a) supplying the at least one first oligomer composition (OC1) via pipes (1), (1a), (1c), and optionally (1b) to the main reactor units (R1), (R3), and optionally (R2),
b) polycondensation of the at least one first oligomer composition (OC1) in the main reactor units (R1), (R3), and optionally (R2), wherein the target product (T1) is obtained,
c) removing the target product (T1) from the main reactor units (R1), (R3), and optionally (R2) via pipes (6a), (6c), and optionally (6b),
(PT2) simultaneous production of target products (T1) and (T2):
a) supplying the at least one first oligomer composition (OC1) via pipes (1), (1a), (1c), and optionally (1b) to the main reactor units (R1), (R3), and optionally (R2), and
b) supplying the at least one second oligomer composition (OC2) via pipes (2) and (1a) to the first main reactor unit (R1),
c) polycondensation of the at least one first oligomer composition (OC1) and the at least one second oligomer composition (OC2) in the main reactor unit (R1), wherein the target product (T2) is obtained, and polycondensation of the at least one first oligomer composition (OC1) in main reactor units (R3) and optionally (R2), wherein the target product (T1) is obtained,
d) removing target product (T2) from the main reactor unit (R1) via pipe (6a), and removing target product (T1) from the main reactor units (R3) and optionally (R2) via pipes (6c) and optionally (6b),
(PT3) production of target product (T3):
a) supplying the at least one third oligomer composition (OC3) via pipes (3a) and (3c) to the first container (B1),
b) mixing the at least one third oligomer composition (OC3) and the at least one first oligomer composition (OC1) in the first container (B1), wherein a product (P1) is obtained comprising the at least one third oligomer composition (OC3) and the at least one first oligomer composition (OC1) in reacted form,
c) supplying the product (P1) via pipes (1), (1a), (1c), and optionally (1b) to the main reactor units (R1), (R3), and optionally (R2),
d) polycondensation of the product (P1) in the main reactor units (R1), (R3), and optionally (R2), wherein the target product (T3) is obtained,
e) removing the target product (T3) from the main reactor units (R1), (R3), and optionally (R2) via pipes (6a), (6c), and optionally (6b).
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