Depolymerization of PLA by Phase Transfer Catalysed Alkaline Hydrolysis in a Microwave Reactor

被引:28
作者
Siddiqui, Mohammad Nahid [1 ,2 ]
Kolokotsiou, Lydia [3 ]
Vouvoudi, Evangelia [3 ]
Redhwi, Halim Hamid [4 ]
Al-Arfaj, Abdurrahman A. [1 ,2 ]
Achilias, Dimitris S. [3 ]
机构
[1] King Fahd Univ Petr & Minerals, Dept Chem, Dhahran 31261, Saudi Arabia
[2] King Fahd Univ Petr & Minerals, Ctr Excellence Nanotechnol CENT, Dhahran 31261, Saudi Arabia
[3] Aristotle Univ Thessaloniki, Lab Polymer & Dyes Chem & Technol, Dept Chem, Thessaloniki 54124, Greece
[4] King Fahd Univ Petr & Minerals, Dept Chem Engn, Dhahran 31261, Saudi Arabia
关键词
PLA; Alkaline hydrolysis; Microwave irradiation; Degradation; Phase transfer catalyst; POLY(LACTIC ACID); IONIC LIQUID; DEGRADATION; METHANOLYSIS; KINETICS; WASTE;
D O I
10.1007/s10924-020-01716-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Poly(lactic acid) (PLA) is one of the most important polyester bioplastics, produced from agricultural renewable resources and due to its excellent properties already has found applications in several industrial sectors, including packaging. Its amount, relative to PET, in the waste stream is continuously increasing. Although waste bioplastics are biodegradable, the process sometimes needs long degradation times. Therefore, sufficient recycling techniques should be developed in terms of sustainable chemistry. Hydrolysis of PLA under microwave irradiation in an alkaline solution was investigated aiming in the chemical recycling of this biodegradable polymer and the recovery of the monomer, lactic acid. Several process parameters were examined, including the presence or not of an alkali solution, its amount and concentration, the presence or not of methanol in the reaction medium, together with reaction temperature and time. Moreover, several phase transfer catalysts were employed at various relative amounts to PLA. Reaction temperature, pressure and microwave power did not change significantly during degradation. Optimum experimental conditions, leading to PLA degradation more than 90%, were achieved using hexadecyltrimethylammonium bromide as phase transfer catalyst in a 10% w/v NaOH medium at 100 degrees C for 10 min irradiation time. Using such low temperature and degradation times results in great environmental benefit since it does not consume significant amount of energy compared to other similar techniques proposed in literature and thus leads to the sustainability of the process. Therefore, it seems to be a very efficient method to be used in the recycling of large amounts of this polymer.
引用
收藏
页码:1664 / 1672
页数:9
相关论文
共 24 条
[1]   Polymer Degradation Under Microwave Irradiation [J].
Achilias, Dimitris S. .
MICROWAVE-ASSISTED POLYMER SYNTHESIS, 2016, 274 :309-346
[2]   Impact of Bio-Based Plastics on Current Recycling of Plastics [J].
Alaerts, Luc ;
Augustinus, Michael ;
Van Acker, Karel .
SUSTAINABILITY, 2018, 10 (05)
[3]  
Bastioli C., 2005, Handbook of biodegradable polymers
[4]   Mechanical recycling of poly(lactic acid): Evaluation of a chain extender and a peroxide as additives for upgrading the recycled plastic [J].
Beltran, Freddys R. ;
Infante, Celia ;
Ulagares de la Orden, Ma ;
Martinez Urreaga, Joaquin .
JOURNAL OF CLEANER PRODUCTION, 2019, 219 :46-56
[5]   Kinetics of the hydrolytic degradation of poly(lactic acid) [J].
Codari, F. ;
Lazzari, S. ;
Soos, M. ;
Storti, G. ;
Morbidelli, M. ;
Moscatelli, D. .
POLYMER DEGRADATION AND STABILITY, 2012, 97 (11) :2460-2466
[6]   Degradation of Post-consumer PLA: Hydrolysis of Polymeric Matrix and Oligomers Stabilization in Aqueous Phase [J].
Cristina, Annesini Maria ;
Sara, Frattari ;
Fausto, Gironi ;
Vincenzo, Piemonte ;
Rocchina, Sabia ;
Claudio, Villani .
JOURNAL OF POLYMERS AND THE ENVIRONMENT, 2018, 26 (12) :4396-4404
[7]   Thermal degradation of poly(L-lactide): effect of alkali earth metal oxides for selective L,L-lactide formation [J].
Fan, YJ ;
Nishida, H ;
Mori, T ;
Shirai, Y ;
Endo, T .
POLYMER, 2004, 45 (04) :1197-1205
[8]   Recycling of waste from polymer materials: An overview of the recent works [J].
Hamad, Kotiba ;
Kaseem, Mosab ;
Deri, Fawaz .
POLYMER DEGRADATION AND STABILITY, 2013, 98 (12) :2801-2812
[9]   Chemical recycling of poly(lactic acid) by water-ethanol solutions [J].
Iniguez-Franco, Fabiola ;
Auras, Rafael ;
Dolan, Kirk ;
Selke, Susan ;
Holmes, Daniel ;
Rubino, Maria ;
Soto-Valdez, Herlinda .
POLYMER DEGRADATION AND STABILITY, 2018, 149 :28-38
[10]  
Kosmidis VA, 2001, MACROMOL MATER ENG, V286, P640, DOI 10.1002/1439-2054(20011001)286:10<640::AID-MAME640>3.0.CO