IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0507613
(2006-08-22)
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등록번호 |
US-7288620
(2007-10-30)
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우선권정보 |
FR-01 10170(2001-07-30) |
발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Finnegan, Henderson, Farabo, Garrett and Dunner, L.L.P.
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인용정보 |
피인용 횟수 :
3 인용 특허 :
0 |
초록
▼
The present invention relates to-a process and a device for the continuous manufacture of a polymer of an aromatic alkylene monomer e.g. styrene comprising a bulk polymerisation of the monomer and a devolatilization of the resulting polymer in at least two successive steps so as to separate the pol
The present invention relates to-a process and a device for the continuous manufacture of a polymer of an aromatic alkylene monomer e.g. styrene comprising a bulk polymerisation of the monomer and a devolatilization of the resulting polymer in at least two successive steps so as to separate the polymer from the unreacted monomer and the oligomers formed during the polymerisation. The process comprises conveying a first gas stream resulting from the first step of the devolatilization into a first zone Z1 for direct condensation and fractionation, removing a gas stream G1 comprising essentially the monomer from the top of Z1, and removing a liquid stream L1 rich in oligomers from the bottom of Z1, a portion of L1 being taken, cooled and then returned into Z1. It also comprises conveying a second gas stream resulting from the second step of the devolatilization into a second zone Z2 for direct condensation and fractionation, this zone being also fed with the other portion of L1, removing a gas stream G2 comprising the monomer from the top of Z2, and removing a liquid stream L3 comprising essentially the oligomers from the bottom of Z2. The process and the device are particularly suitable for continuously manufacturing a styrene polymer, a styrene copolymer having a high impact strength modified by grafting onto a rubber, an expandable polystyrene or an expanded polystyrene. The invention is useful for improving the separation of the unreacted monomer from the oligomers and the quality of the polymer when the unreacted monomer thus separated is recycled e.g. to the polymerisation.
대표청구항
▼
The invention claimed is: 1. In a device for the continuous manufacture of an aromatic alkylene polymer, having a zone for the bulk polymerization of an aromatic alkylene monomer that is linked to a polymer devolatilization zone successively including at least one first devolatilizer DV1 and one se
The invention claimed is: 1. In a device for the continuous manufacture of an aromatic alkylene polymer, having a zone for the bulk polymerization of an aromatic alkylene monomer that is linked to a polymer devolatilization zone successively including at least one first devolatilizer DV1 and one second devolatilizer DV2 so as to separate polymer from unreacted monomer and oligomers formed at least partly during the polymerization, the improvement comprising: a first line for removing a first gas stream from DV1 that links DV1 to a first zone Z1 for direct condensation and fractionation, a first top withdrawal line for removing from a top of zone Z1 a gas stream G1 essentially comprising monomer, a first bottom withdrawal line for removing from a bottom of zone Z1 a liquid stream L1 rich in oligomers, and a recycling line for returning a portion of the liquid stream L1 in the first bottom withdrawal line to a cooling unit and then to the first zone Z1, and a second line for removing a second gas stream from DV2 that links DV2 to a second zone Z2 for direct condensation and fractionation, said first bottom withdrawal line also being linked to the second zone Z2 so as to feed zone Z2 with another portion of the liquid stream L1, a second top withdrawal line for removing from a top of zone Z2 a gas stream G2 comprising monomer, and a second bottom withdrawal line for removing from a bottom of zone Z2 a liquid stream L3 essentially comprising oligomers. 2. The device of claim 1, wherein the first top withdrawal line for removing the gas stream G1 is linked to a condenser so as to form a liquid stream that is connected to a first recovery line. 3. The device of claim 2, wherein the first recovery line is linked directly or indirectly to the zone for the bulk polymerization of the aromatic alkylene monomer for returning at least a portion of the liquid stream to the bulk polymerization zone. 4. The device of claim 2 or 3, including a reflux line linked to the first recovery line and the first zone Z1 for returning another portion of the liquid stream to the first zone Z1. 5. The device of claim 4, wherein the reflux line returns said another portion of the liquid stream to a top part of first zone Z1. 6. The device of claim 1, wherein the recycling line, in which circulates the portion of the liquid stream L1, cooled by the cooling unit, opens into a central part of zone Z1. 7. The device of claim 1, wherein the recycling line, in which circulates the portion of the liquid stream L1, cooled by the cooling unit, opens into a point in zone Z1 such that it determines in zone Z1 a top part for fractionation of the oligomers, and a bottom part for direct condensation. 8. The device of claim 1, wherein the first line for removing the first gas stream from DV1 opens into a part of zone Z1 which is below a point of return at which the recycling line opens into zone Z1. 9. The device of claim 8, wherein the first line opens into a bottom part of zone Z1. 10. The device of claim 1, wherein the second line for removing the second gas stream from DV2 opens into a bottom part of zone Z2. 11. The device of claim 1, wherein the first bottom withdrawal line of zone Z1 also opens into zone Z2 at a point which is above the point at which the second line for removing the second gas stream from DV2 opens into zone Z2. 12. The device of claim 11, wherein the first bottom withdrawal line opens into a central part of zone Z2. 13. The device of claim 1, wherein the first bottom withdrawal line of zone Z1 also opens into zone Z2 at a point such that it determines in zone Z2 a top part for fractionation of the oligomers, and a bottom part for direct condensation. 14. The device of claim 1, wherein the second top withdrawal line is linked to a condenser so as to form a liquid stream L2 of gas stream G2. 15. The device of claim 14, wherein a second recovery line for recovering the liquid stream L2 links the condenser directly or indirectly to the first zone Z1. 16. The device of claim 15, wherein the second recovery line is linked to a top part of zone Z1. 17. The device of claim 15, wherein the second recovery line for recovering the liquid stream L2 is equipped with a reflux vessel and a pump. 18. The device of claim 15 or 17, wherein the second recovery line for recovering the liquid stream L2 is equipped with a fractionation chamber capable of fractionating the liquid stream L2 so as to purify the stream L2 of monomer. 19. The device of claim 15, wherein a third line for removing a portion of the liquid stream L2 links the second recovery line to zone Z2. 20. The device of claim 19, wherein the third line is linked to a top part of zone Z2. 21. The device of claim 1, wherein a connecting line linking DV1 to DV2 is equipped with a stripping line for adding a stripping agent for facilitating the devolatilization, and a static mixer capable of forming a homogeneous mixture of the mass of polymer with the stripping agent. 22. The device of claim 1, wherein a steam line for adding heated steam opens into zone Z2. 23. The device of claim 1, wherein the steam line opens into a bottom part of zone Z2.
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