Abstract: To solve the limitations of methanol washing tower efficiency and the problem of excessive amounts of methanol content in the mixed carbon four in a mixed carbon four deep processing project in a petrochemical company,a complete sets of technical equipment of a hybrid micro extraction coupled modular depth of coalescence separation is developed for removal of methanol in the carbon four. The pilot test is performed at a side line of the petrochemical company. The experimental results show that at the inlet and outlet pressure drop of 5kPa,water injection 5%,retention time within 180s and the inlet methanol content of 300—400μL/L,1200—1400μL/L and 40000—50000μL/L in the mixed carbon four,the outlet methanol content is 10—30μL/L,50—100μL/L and 4000—5000μL/L with a separation efficiency higher than 96%,95% and 88%,respectively. The features of deep and quick separation ability of methanol with low pressure drop at a wider range of elasticity of operation show that the technology has a good applicability in the system of water elution of methanol in carbon four,providing a new way of separating the mixed carbon four and methanol.

Key words: carbon four, micro-extraction, coalescence separation, methanol

摘要： 针对某石化公司混合碳四深加工项目中因甲醇水洗塔效率的局限性而导致混合碳四中甲醇含量超标的问题，开发了一种混合微萃取耦合模块化深度聚结分离的碳四脱甲醇的成套技术设备，并在某石化公司现场进行中试侧线实验研究。实验结果表明，该成套设备在进出口压降为5kPa，注水比例为5%，停留时间180s以内：对入口甲醇含量分别为300~400μL/L，1200~1400μL/L和40000~50000μL/L的混合碳四，出口甲醇含量为10~30μL/L、50~100μL/L和4000~5000μL/L；分离效率分别为96%、95%及88%以上。分离迅速且在较宽的操作弹性范围内表现出深度分离甲醇的能力及低压降的特点，表明了该技术在碳四水洗脱甲醇系统中具有良好的适用性，为混合碳四分离甲醇提供了新思路。

关键词: 碳四, 微萃取, 聚结分离, 甲醇