Skip to main content
+41 (0)61 815 30 00

탈휘발화


사례

엘라스토머

  • 에틸렌 – 프로필렌 고무 (EPDM)
  • 폴리부타디엔 고무 (BR)
  • 부틸(이소부틸렌 이소프렌) 고무 (IIR)
  • 폴리이소프렌 고무 (IR)
  • 솔루션-스티렌부타디엔 고무 (S-SBR)
  • 폴리올레핀 엘라스토머 (POE)
  • 아크릴로니트릴 -부타디엔 고무 (NBR)

열가소성 엘라스토머

  • 스티렌 블록 공중합체 (SBS, SIS)

리스트의 직탈휘발화 공정(LIST direct devolatilization process)은 다양한 중합체 및 엘라스토머의 탈휘발을 위한 가장 진보적이고 경제적인 방법입니다. 공정 챔버에서 제품의 체류 시간을 증가시킴으로써 용매 및 잔여 단량체를 더욱 효율적으로 제거할 수 있습니다. 동시에 제품 손상 전단력이 크게 감소합니다. 결과적으로 잔류 휘발성 물질을 최소화하면서 더 나은 제품 품질을 얻을 수 있습니다.

리스트의 니더반응기(LIST KneaderReactor)는 고점도의 고분자 용액에서 이러한 잔류 휘발성 물질을 제거하는데 매우 적합합니다. 이 기술은 일반적으로 용매 제거가 열악한 물질 전달 속도에 의해 방해받는 곳에서 사용됩니다. 증발 성능의 부족을 타협하기 위해 가장 낮은 기계적 열 입력에서 높은 표면 재생이 요구됩니다. 리스트의 니더반응기의 광범위한 자유 증기 부피는 장비를 고진공 상태에서 작동시키는데 도움이 됩니다. 선택적으로, 스트리핑 보조제를 이용하면 용매의 분압을 감소시키거나 이 보조제의 증발 냉각에 의해 제품 온도 조절이 가능하겠습니다.

특이사항

  • 효과적인 셀프 클리닝으로 인한 데드존, 제품 축적 및 분해산물의 최소화
  • 최적의 반죽 및 믹싱으로 인한 우수한 균일화
  • 저전단 공정
  • 효과적인 열전달
  • 고효율 표면 갱신
  • 광범위한 프리(free)증기부피
  • 광범위한 전열면적으로 인한 정밀하고 균일한 온도 컨트롤
  • 연속 공정
  • 점착성이 있거나 고점도의 제품처리 공정
  • 잘록한 체류 시간 분포 (관형 흐름)
  • 넓고 유연한 평균 체류 시간
  • 시험/파일럿용 장비부터 공업규모까지 신뢰할 수 있는 스케일업
  • 저/고 무니 엘라스토머

다운로드

제목설명언어년도다운로드
Direct devolatilisation in a closed system

For decades, conventional polymerisation has been the norm in the production of elastomers. The time and cost involved in removing and treating solvents in the final stages of production were acceptable. Yet as pressure builds on manufacturers to reduce operating costs, there is greater urgency to develop processes that can help streamline costs and production techniques. One such effort has yielded extremely promising results.

English2015
Efficient and eco-friendly polymerization of elastomers

For decades, conventional polymerization in the production of elastomers has been the norm. The time and cost involved in removing and treating solvents in the final stages of production, for example, were acceptable. But as pressure builds on manufacturers to reduce operating costs, there is greater urgency to develop processes that can help streamline cost and production. One such effort by List AG has yielded promising results.

English2014
Efficient & Easy Elastomer Processing

Conventional polymerisation in the production of elastomers has been the norm for decades. The time and cost involved in removing and treating solvents in th e final stages of production , for example, were acceptable, but as pressure builds on manufacturers to reduce operating costs, there is greater urgency to develop processes that can help streamline cost and production. One such effort has yielded extremely promising results.

English2013
Continuous masterbatch process for the cellulose fiber industry

The achievable final volatile content within kneader devolatilization processes is highly dependent on the final melt temperature. For thermosensitive polymers the state of the art process performs poorly. The amount of dissipated energy leads to a heat up of the polymer, limiting the maximal kneader shaft speed and therefore volatile removal rate. This new process uses a suitable additional volatile compound to cool off the dissipated energy by evaporation using the off gas to strip and boost the mass transfer coefficient. A complex multi-parameter study is presented, to predict performance of industrial equipment from pilot scale data.

English2011
New devolatilization process for thermosensitive and highly viscous polymers in high volume Kneader Reactors

The achievable final volatile content within kneader devolatilization processes is highly dependent on the final melt temperature. For thermosensitive polymers the state of the art process performs poorly. The amount of dissipated energy leads to a heat up of the polymer, limiting the maximal kneader shaft speed and therefore volatile removal rate. This new process uses a suitable additional volatile compound to cool off the dissipated energy by evaporation using the off gas to strip and boost the mass transfer coefficient. A complex multi-parameter study is presented, to predict performance of industrial equipment from pilot scale data.

English2011
Kneten statt strippen

Der Einsatz von großen Lösemittelmengen in Polymerisationsprozessen mit den damit verbundenen Nachteilen muss nicht sein. Ein optimiertes Verfahren ermöglicht die direkte Entgasung von Lösemitteln, ohne dabei Strippmittel einsetzen zu müssen. Aufwendige Trennschritte werden so vermieden und höhere Produktqualitäten können erreicht werden.

Deutsch2010
Schritt in eine neue Welt

Der Einsatz von großen Lösungsmittelmengen in Polymerisationsprozessen mit den damit verbundenen Nachteilen muss nicht sein. Ein neues Verfahren beschreitet neue Wege: Kneten statt strippen lautet die Devise.

Deutsch2010
Predition of mass transport of solvent / polymer systems in high volume Kneader Reactors at finite solvent concentrations

Kneader reactors are used for combined unitary processing in the polymer industry for devolatilization, compounding or polymerization. In the past, mass transport prediction for devolatilization operations in kneader reactors did not match experimental results, when diffusion was assumed as sole driving force. It was detected that there is an additional concentration and temperature dependent driving force that triggers enhanced transport at finite solvent concentrations by orders of magnitude. The author suggests that the underlying root cause is likely micro bubble formation within the polymer melt. An attempt to model this additional mass transport mechanism is presented.

English2008
Kneader technology for the direct devolatilitation of temperature sensitive elastomers

Synthetic elastomers have been produced for over 50 years. Advances in catalyst systems and polymer formulations have been somewhat diminished by the continued use of the same processing technology. In particular, the use of coagulation, steam stripping, mechanical dewatering, and convective drying for the devolatilization of temperature sensitive elastomeric solutions can be replaced with direct devolatilization using kneader technology. A two-step, direct devolatilization process has demonstrated energy savings and advantages in environmental emissions and process/product flexibility when compared to the conventional steam stripping process.

English2008
Ohne Wasserdampf zum Kautschuk

Die Synthese von Kautschuk ist ein wichtiger Prozess: Hersteller von Gummiprodukten – ganz gleich ob Autoreifen oder Kondome – benötigen hochwertigen Kautschuk als Ausgangswerkstoff. Doch die Kautschukerzeugung ist teuer und verschlingt große Mengen an Energie. Forschern des Fraunhofer-Instituts für Angewandte Polymerforschung IAP in Potsdam ist es gemeinsam mit ihren Entwicklungspartnern LIST AG und Dow Olefinverbund GmbH gelungen, den Energiebedarf der Kautschuksynthese um 76 Prozent zu senken.

Deutsch2007
Somethin special in separation technology

The synthesis of most elastomers is carried out either by Solution or emulsion polymerization. After the polymcrization step, the polymer is separated from the solvent or emulsifying agents. This separation requires several process steps including coagulation, Stripping, various mechanical separation stages, and finally diying. Beyond that, the existing technologies are energy consuming, waste solvent must be incinerated, and the installation of main and ancillaiy equipment occupies large spaces.

English2007
Eindampfung und Entgasung von Polymerschmelzen

Die bestehenden Technologien für die Aufbereitung von Polymeren nach der Polymerisation können in ein-, zwei- und mehrstufige Verfahren unterteilt werden. Dem entsprechend kommen Stripptechnologien mit nachgeschalteter mechanischer und thermischer Entfernung der Hilfsmittel, Extruder in verschiedenen Bauarten und großvolumige Kneter zum Einsatz. Die Knetertechnologie ist vor allem für temperatur- und scherempfindliche Polymermassen geeignet, bei denen die Entgasung diffusionsbestimmt ist.

Deutsch2006
Kontinuierliche Eindampfung und Entgasung von Polymerschmelzen

Polymerprozesse – Aufbereitung und Finishing von Polymeren – Knetertechnologie in der Polymeraufbereitung – Wirtschaftlichkeit

Deutsch2006
Torque and speed fluctuation on polymer processing large volume kneader

Large volume kneaders are designed to handle highly viscous polymer processing. The unitary operations can be compounding, polymerizations, devolatilization or drying. Depending on the polymer viscosity in the kneader, the interaction of kneading elements induce a torque and force evolution on the shaft over one revolution.

English2006
Computer Berechnung des Scale up für Entgasungsvorgänge in Knetreaktoren

Eine konzentrierte Elastomerlösung (weniger als 20 % Lösungsmittel) wird einem großvolumigen Knetreaktor zugeführt, um das Lösungsmittel bis auf ppmGehalte zu entfernen. Um diesen Entgasungsschritt zu beschreiben, wurde ein Simulationsprogramm entwickelt. Das Programm errechnet den Restlösungsmittelgehalt, den Füllgrad und das Drehmoment des Reaktors. Es kann sowohl der Feineinstellung sowie auch dem Scale-up des Prozesses dienen.

Deutsch2005
Leuchtturm in karger Forschungslandschaft

Das Fraunhofer-Pilotanlagenzentrum für Polymersynthese und -verarbeitung

Deutsch2005
Computer scale up model for Desolventizing highly viscous polymers

A concentrated rubber solution (less than 20 % solvent) is fed to a high volume kneader in order to remove the solvent down to ppm level. A simulation program has been developed to describe this devolatilization step. The program predicts final solvent content, the filling level and the mechanical torque build-up. The program can be used to refine process control and the scale-up of this type of process.

English2005
Comparison devolatilization technologies for viscous polymers

Devolatilization of solvents from viscous polymer cement is realized through stripping of solvent with steam in stirred vessels or directly by evaporating the solvent from the polymer. The later so-called direct desolventizing is realized in extruders or high volume kneaders. All 3 methods involve additional energy to drive out solvent either by partial pressure through additional steam (steam stripping), building and releasing pressure in order to explode the polymer bulk (extruder) or dynamic surface renewal (kneader).

English2005
LIST im Demo Zentrum Polymersynthese

Energieeinsparung und Qualitätsverbesserung durch indirekte Eindampfung von Polymerlösungen oder direkte Polymerisation und Polykondensation

Deutsch2004
Finishing reaction of PA6 in the melt phase

The difference in the production of PA6 in comparison to that of other polymers is the downstream water extraction and drying after the granulation. During these process steps, the monomer and the oligomer contents in the final product are reduced in the 0.2 to 0.6 ww/w range. The installed units for extraction and drying of the final granulated product are characterized by their large energy consumption, which considerably influences manufacturing costs.

English2002