Optimization of Atmospheric Pressure Continuous Distillation Process of Isoprene Latex

doi:10.19894/j.issn.1000-0518.250050

Chinese Journal of Applied Chemistry ›› 2026, Vol. 43 ›› Issue (2): 249-258.DOI: 10.19894/j.issn.1000-0518.250050

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Optimization of Atmospheric Pressure Continuous Distillation Process of Isoprene Latex

Hong-Fu ZHAO¹(), Yu-Xuan BU², Xiao-Jun LYU¹, Qing-Bo ZHAO¹, Hong-Hong WANG², Kai-Hua SHEN², Quan-Bao SHI¹

^1.Xinjiang Tianli Petrochemical Co. ，Ltd. ，Dushanzi 833699，China
^2.School of Chemical Engineering，Dalian University of Technology，Dalian 116024，China

Received:2025-02-08 Accepted:2025-11-06 Published:2026-02-01 Online:2026-03-06
Contact: Hong-Fu ZHAO
About author:1076753959@qq.com
Supported by:
the Foundation:Key Research and Development Program of Xinjiang Uygur Autonomous Region(2022B01043);the Outstanding Engineer of Tianshan Talent in Xinjiang Uygur Autonomous Region(EB0046);Karamay “Oil City Cost oriented Engineer” Project and the Project Funding from Xinjiang Petrochemical Industry Innovation Research Institute

Abstract

Abstract:

This study systematically investigated the solvent removal process from isoprene emulsion containing solvents， a critical step in synthetic polyisoprene latex production. The research focused on analyzing the effects of continuous distillation parameters， including distillation temperature， average residence time， solvent removal efficiency， and solid content， while comparing different distillation configurations. The results indicated that when the optimal distillation temperature in a single kettle ranged from 70~72 ℃ and the average residence time was between 5.5~6.5 h， the solvent removal rate could reach 65%~75%， with an outlet solid content of approximately 9% and a gel content of less than 2%. By adopting a continuous distillation process that combined multi-stage series and parallel configurations （e.g.， three parallel kettles in series with a fourth kettle， with the temperature in all four kettles not exceeding 78 ℃）， it was possible to effectively enhance the utilization rate of distillation equipment and the processing capacity of latex while maintaining stable process parameters. This study provides technical references for optimizing solvent removal processes in industrial production.

Key words: Polyisoprene latex, Production process, Continuous method, Parallel and tandem

CLC Number:

O631.5

Hong-Fu ZHAO, Yu-Xuan BU, Xiao-Jun LYU, Qing-Bo ZHAO, Hong-Hong WANG, Kai-Hua SHEN, Quan-Bao SHI. Optimization of Atmospheric Pressure Continuous Distillation Process of Isoprene Latex[J]. Chinese Journal of Applied Chemistry, 2026, 43(2): 249-258.

Figures/Tables 19

References 9

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Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
68~74	12.5	92.7	18.8	Unremovable foam
68~72	14.0	95.5	20.1	Unremovable foam
69~73	13.2	94.6	18.5	Unremovable foam
68~72	12.8	90.8	19.7	Unremovable foam
68~73	13.7	93.7	19.3	Unremovable foam

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
68~74	12.5	92.7	18.8	Unremovable foam
68~72	14.0	95.5	20.1	Unremovable foam
69~73	13.2	94.6	18.5	Unremovable foam
68~72	12.8	90.8	19.7	Unremovable foam
68~73	13.7	93.7	19.3	Unremovable foam

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
66	8.5~9.0	55~60	0.34	Less foam， evanescent， calm state
67	8.5~9.0	60~65	0.49	Less foam， evanescent， calm state
69	8.5~9.0	75~80	0.46	Less foam， evanescent， calm state
69	7.0~7.5	50~55	0.48	Less foam， evanescent， calm state
70	7.0~7.5	70~75	0.50	More foam， fleeting， calm state
71	7.0~7.5	80~85	0.60	More foam， fleeting， calm state
72	7.0~7.5	90~95	0.60	More foam， fleeting， calm state

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
66	8.5~9.0	55~60	0.34	Less foam， evanescent， calm state
67	8.5~9.0	60~65	0.49	Less foam， evanescent， calm state
69	8.5~9.0	75~80	0.46	Less foam， evanescent， calm state
69	7.0~7.5	50~55	0.48	Less foam， evanescent， calm state
70	7.0~7.5	70~75	0.50	More foam， fleeting， calm state
71	7.0~7.5	80~85	0.60	More foam， fleeting， calm state
72	7.0~7.5	90~95	0.60	More foam， fleeting， calm state

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
76	4.0~4.5	15~25	0.92	Less foam， calm state
78	4.0~4.5	25~35	0.90	Foam increases
80	4.0~4.5	-	3.36	A large amount of foam

Optimization of Atmospheric Pressure Continuous Distillation Process of Isoprene Latex

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Figures/Tables 19

References 9

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Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
71	7.0~7.5	85~90	0.24	Less foam， calm state
71	6.0~6.5	65~70	0.37	Less foam， calm state
71	5.5~6.0	60~65	0.37	Less foam， calm state
74	5.5	70~75	0.49	Foam increases
74	5.0	70	0.50	Foam increases

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
76	8.0	40~45	0.92	Less foam， calm state
76	4.5	15~25	0.68	Less foam， calm state
76	3.0	20~25	0.98	Less foam， calm state
78	4.5	25~30	0.90	Foam increases
78	3.0	25~35	0.95	Foam increases
78	2.5	30~40	2.24	A large amount of foam

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
76	4.2~4.5	15~25	0.68	Less foam， calm state
78	4.2~4.5	25~30	0.90	Foam increases

Distillation temperature/℃	Distillation duration/h	Solvent removal rate/%	Gel loss/%	Phenomenon
78	2.5	35~45	2.24	A large amount of foam
80	2.5	25~35	3.36	A large amount of foam

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