여러 반응 존을 가지는 폴리에틸렌 관형반응기 해석(I) : 생성고분자 물성에 대한 영향

김재연; 이희석; Jae Youn Kim; Heui-Seok Yi

Polymer(Korea), Vol.23, No.3, 348-360, May, 1999

Export Citation

여러 반응 존을 가지는 폴리에틸렌 관형반응기 해석(I) : 생성고분자 물성에 대한 영향

Analysis of Polyethylene Tubular Reactors with Multiple Reaction Zone(I): The Effect on Production Polymer Properties

김재연^†, 이희석

한화종합화학 중앙연구소 화성연구센터

Jae Youn Kim^†, and Heui-Seok Yi

Chemicals Research Division, Hanwha Chemical Corp., Central Research Center, Daejon, Korea

E-mail:

초록

저밀도 폴리에틸렌의 생산성을 향싱시키기 위하여 관형 반응기의 직경을 변화시키는 방법을 제시하였다. 폴리에틸렌을 생산하는 직경이 일정한 기준 반응기를 제시하고 이 반응기의 지금을 변화시켜 가면서 물성과 전활율의 변화를 비교 분석하였다. 빈응기의 지금이 확장되는 부분에서의 온도와 압력 변화는 운동량 수지와 Joule-Thomson 상수를 이용하였다. 폴리에틸렌의 수평균 및 중량평균 분자량 변화를 계산하기 위하여 모멘트를 이용하였고 폴리에틸렌의 단분지와 장분지의 변화를 살펴보았다. 반응기 직경이 커짐에 따라 에틸렌의 전환율과 단분지, 장분지, 다분산성 등은 증가함을 보였으나 폴리에틸렌의 평균 분자량은 감소하였다.

An improvement of the production yield of polyethylene in the high pressure tubular reactors was observed by changing the diameter. The properties of low-density polyethylene and monomer conversion for the proposed process are compared with those for a reference reactor which has constant diameter through the reactor length. Joule-Thomson coefficient and momentum balance are used to calculate the temperature change caused by the sudden pressure change. The method of moments is applied in order to estimate the number average molecular weight and weight average molecular weight. Short chain branching(SCB) and long chain branching (LCB) are also calculated. As the reactor diameter increases, monomer conversion, SCB, LCB and polydispersity (PD) increase but average molecular weight decreases.

Keywords:LDPE;tubular reactor;production rate;diameter;dynamics

[References]

Agrawal S, Han CD, AIChE J., 21, 449 (1975)
Chen CH, Vermecychuk JG, Howell JA, Ehrlich P, AIChE J., 22, 463 (1976)
Lee KH, Marano JP, Am. Chem. Soc. Symp. Ser., 104, 221 (1979)
Goto S, Yamamoto K, Furui S, Sugimoto M, J. Appl. Polym. Sci. Appl. Polym. Symp., 36, 21 (1981)
Hollar W, Ehrlich P, Chem. Eng. Commun., 24, 57 (1983)
Gupta SK, Kumar A, Krishnamurty MVG, Polym. Eng. Sci., 25, 37 (1985)
Mavridis H, Kiparissides C, Polym. Process Eng., 3(3), 263 (1985)
Yoon BJ, Rhee HK, Chem. Eng. Commun., 34, 253 (1985)
Brandolin A, Capiati NJ, Farber JN, Valles EM, Ind. Eng. Chem. Res., 27, 784 (1988)
Azevedo F, Howell JA, Chem. Eng. Res. Des., 66(2), 128 (1988)
Zabisky RC, Chan WM, Gloor PE, Hamielec AE, Polymer, 33(11), 2243 (1992)
Kiparissides C, Verros G, Kalfas G, Koutoudi M, Kantzia C, Chem. Eng. Commun., 121, 193 (1993)
Brandolin A, Lacunza MH, Ugrin PE, Capiati N, J. Polym. Reaction Eng., 4(4), 193 (1996)
Han CD, Liu TJ, HWAHAK KONGHAK, 15(4), 249 (1977)
Ahn YC, Rhee HK, Choi CK, HWAHAK KONGHAK, 23(6), 399 (1985)
Beals CD, U.S. Patent, 4,135,044 (1979)
Knight RM, U.S. Patent, 3,719,643 (1973)
Clementi A, Battini R, U.S. Patent, 3,809,688 (1974)
Jefferson WT, Modell M, "Thermodynamics and Its Applications," Prentice Hall (1997)
Shirodkar PP, Tsien GO, Chem. Eng. Sci., 41, 1031 (1986)
Willbourn AH, J. Polym. Sci., 34, 569 (1956)
Luft G, Kampf R, Seidi H, Angew. Makromol. Chem., 108, 203 (1982)

[1] Agrawal S, Han CD, AIChE J., 21, 449 (1975)

[2] Chen CH, Vermecychuk JG, Howell JA, Ehrlich P, AIChE J., 22, 463 (1976)

[3] Lee KH, Marano JP, Am. Chem. Soc. Symp. Ser., 104, 221 (1979)

[4] Goto S, Yamamoto K, Furui S, Sugimoto M, J. Appl. Polym. Sci. Appl. Polym. Symp., 36, 21 (1981)

[5] Hollar W, Ehrlich P, Chem. Eng. Commun., 24, 57 (1983)

[6] Gupta SK, Kumar A, Krishnamurty MVG, Polym. Eng. Sci., 25, 37 (1985)

[7] Mavridis H, Kiparissides C, Polym. Process Eng., 3(3), 263 (1985)

[8] Yoon BJ, Rhee HK, Chem. Eng. Commun., 34, 253 (1985)

[9] Brandolin A, Capiati NJ, Farber JN, Valles EM, Ind. Eng. Chem. Res., 27, 784 (1988)

[10] Azevedo F, Howell JA, Chem. Eng. Res. Des., 66(2), 128 (1988)

[11] Zabisky RC, Chan WM, Gloor PE, Hamielec AE, Polymer, 33(11), 2243 (1992)

[12] Kiparissides C, Verros G, Kalfas G, Koutoudi M, Kantzia C, Chem. Eng. Commun., 121, 193 (1993)

[13] Brandolin A, Lacunza MH, Ugrin PE, Capiati N, J. Polym. Reaction Eng., 4(4), 193 (1996)

[14] Han CD, Liu TJ, HWAHAK KONGHAK, 15(4), 249 (1977)

[15] Ahn YC, Rhee HK, Choi CK, HWAHAK KONGHAK, 23(6), 399 (1985)

[16] Beals CD, U.S. Patent, 4,135,044 (1979)

[17] Knight RM, U.S. Patent, 3,719,643 (1973)

[18] Clementi A, Battini R, U.S. Patent, 3,809,688 (1974)

[19] Jefferson WT, Modell M, "Thermodynamics and Its Applications," Prentice Hall (1997)

[20] Shirodkar PP, Tsien GO, Chem. Eng. Sci., 41, 1031 (1986)

[21] Willbourn AH, J. Polym. Sci., 34, 569 (1956)

[22] Luft G, Kampf R, Seidi H, Angew. Makromol. Chem., 108, 203 (1982)