摘要
通过高温高压醇解法对废聚对苯二甲酸乙二醇酯(PET)在催化剂金属醋酸盐作用下,进行乙二醇醇解得到对苯二甲酸乙二醇酯(BHET),研究了废PET高温醇解的影响因素及工艺条件。结果表明:在高温醇解反应中,乙二醇与废PET的质量比和反应压力为主要影响因素,反应温度和解聚时间为次要影响因素;BHET收率随反应时间的延长、温度与压力的升高、乙二醇与废PET的质量比加大、催化剂的用量增大而增加,而二甘醇含量(除质量比因素)及醇解产物的熔点则随其相应降低;最佳醇解反应条件为压力0.4 MPa、乙二醇与废PET质量比0.5∶1.0、反应温度250℃、反应时间4 h,BHET收率达82%。
Polyethylene terephthalate （PET） waste was exposed to high-temperature high-pressure ethylene glycol alcoholysis in pressence of metal acetate catalyst to produce ethylene terephthalate （BHET）. The influential factors on the high-temperature al- coholysis of PET waste and the process conditions were studied. The results showed that the mass ratio of ethylene glycol and PET waste and the reaction pressure were the primary influential factors and the reaction temperature and depolymerization time were the secondary factors on the high-temperature alcoholysis ; and the BHET yield was increased with the increase of reaction time, temperature, pressure, ethylene glycol-and-PET waste mass ratio and catalyst amount, but the amount of diethylene glycol （ex- cept the mass ratio） and the melting point of alcoholysates were decreased. The BHET yield reached 82% when the alcoholysis conditions were optimized as followed ： pressure 0.4 MPa, ethylene glycol-and-PET waste mass ratio 0.5 ： 1.0, temperature 250℃ and time 4 h.
出处
《合成纤维工业》
CAS
北大核心
2014年第1期9-12,共4页
China Synthetic Fiber Industry
关键词
聚对苯二甲酸乙二醇酯
回收采用
高温高压
醇解反应
正交实验
polyethylene terephthalate
recovery and utilization
high-temperature high-pressure
aleoholysis
orthogonal ex-periment
