微通道反应器内α-烯烃连续磺化工艺的实验研究

Experimental Study on Continuous Sulfonation Process ofα-Olefins in Microchannel Reactor

α-烯烃磺酸钠(AOS)是具有良好生物降解性、润湿性、低刺激性的阴离子表面活性剂。利用微通道反应器,分别以1-十四烯(AO)和混合烯烃为原料,SO_(3)为磺化剂,考察了磺化温度、SO_(3)/AO摩尔比、磺化剂质量分数、停留时间等工艺条件对活性物AOS含量的影响规律。结果表明:1-十四烯磺化最佳工艺条件为磺化温度40℃、SO_(3)/AO摩尔比为1.2、SO_(3)质量分数为10%;混合烯烃磺化最佳工艺条件为磺化温度50℃、SO_(3)/AO摩尔比为1.1、SO_(3)质量分数为10%。增大流速有利于强化传质过程、提高产物中活性物AOS含量;延长停留时间会加剧副反应发生、降低产物中活性物含量。微通道反应器内α-烯烃磺化是以传质为主的强放热反应,热量移除及时,反应过程易于控制,可有效提高产品质量,大大增强生产工艺的本质安全性,对于开发煤基α-烯烃下游产品具有实际意义。

Sodiumα-olefin sulfonate(AOS)is an anionic surfactant with good biodegradability,wettability and low irritation.Using the 1-tetradecane and mixed olefins as raw materials,and SO_(3) as sulfonation agent,the effects of the process conditions such as sulfonation temperature,molar ratio of SO_(3)/AO,mass fraction of sulfonating agent and residence time on AOS mass fraction in a microchannel reactor are investigated.The results show that the optimal process conditions for the sulfonation of 1-tetradecane are as below:sulfonation temperature of 40℃,SO_(3)/AO molar ratio of 1.2,and SO_(3) mass fraction of 10%.The mixed olefins are sulfonated under the optimal conditions such as sulfonation temperature of 50℃,SO_(3)/AO molar ratio of 1.1,and SO_(3) mass fraction of 10%.The increase of feed-in flow rate can strengthen the mass transfer process and increase the active substance AOS in the product;the increase of residence time can aggravate the occurrence of side reactions and reduce active substances in the product.Theα-olefin sulfonation is a strong exothermic reaction based on mass transfer in microchannel reactor.It can effectively improve the product quality and the intrinsic safety of the process when the heat can be removed in time.It is of practical significance for development of the downstream products of coal-basedα-olefins.