丙烯腈水相沉淀聚合生产工艺研究

Research on productive process of precipitation polymerization of acrylonitrilein water phase

对丙烯腈/醋酸乙烯酯二元共聚体系进行了研究,分析了影响丙烯腈水相沉淀聚合的工艺因素。结果表明:NaClO3的加入量是单体质量的0.45%~0.65%,m(NaClO3):m(NaHSO3)=(1∶3)^(1∶5),单体浓度为30%~35%,m(AN):m(VAc)控制在7.5~12;聚合停留时间45~50 min;聚合温度55~60℃(偏差在±0.5℃);Cu2+含量30~45 mL/m3;NaNO3加入量为单体质量的0.4%~0.6%;聚合体系pH值是2.1~2.7;巯基乙醇(β-ME)的加入量为单体质量的0.15%~0.55%,搅拌速度为200 r/min左右。在此操作条件下,聚合物平均分子量在48 000~64 000范围内,聚合反应转化率超过81%,不但满足多种性能腈纶纤维的生产要求,而且经济合理。

AN/VAc terpolymer was studied by aqueous deposited polymerization,the influence factors on precipitation polymerization of acrylonitrile were analyzed in aqueous medium.The result shows that under the conditions of NaClO3/（AN＋VAc） mass ratio of 0.45%~0.65%,NaClO3/NaHSO3 mass ratio of（1∶3）^（1∶5）,monomer concentration of 30%~35%,AN/VAc mass ratio of 7.5~12,polymerization remaining time of 45~50 min,polymerization temperature of 55~60 ℃（deviton ±0.5℃）,Cu2＋ content of 30~45 mL/m3,NaNO3/（AN＋VAc） mass ratio of 0.4%~0.6%,the system pH value of 2.1~2.7,β-ME/（AN＋VAc） mass ratio of 0.15%~0.55%,stirring velocity about 200 r/min,molecular weight of the polymer was 48 000~64 000,the conversion of polymerization over 81%.Not only can the polymer technology meet the demand of many kinds property acrylic fiber,but also it is economic and reasonable.