萃取法脱除醚化原料中碱性氮化物

催化裂化轻汽油醚化工艺适应了生产清洁汽油的要求 ,轻汽油中含有的少量碱性氮化物中和阳离子交换树脂催化剂的酸性 ,造成催化剂失活。通过研究萃取法脱除催化裂化轻汽油中能使醚化催化剂失活的碱性氮化物的工艺 ,考察了各种工艺条件对碱性氮脱除率的影响。试验结果表明 ,在 2 0～4 0℃的范围内 ,萃取温度对碱性氮脱除率的影响不大。随着水油比增加 ,沉降时间延长 ,水洗次数的增加 ,碱性氮脱出率增加。在室温下 ,水油体积比为 0 .0 5,振荡时间 2 0min ,沉降时间 1 5min的条件下 ,用自来水萃取两次 ,用去离子水萃取一次 ,碱性氮脱除率可达 87%以上 ,轻汽油收率接近 1 0 0 % ,较好地满足了醚化催化剂对醚化原料的要求。水萃取法是脱除催化裂化轻汽油中碱性氮化物的经济有效的方法

Removal of Basic Nitrogen Compounds From Etherification Feed by Extraction

The etherification process of FCC light gasoline meets therequirem ent of producing clean gasoline, while the basic nitrogen compounds can deactiva te the etherification catalyst-sulfonic acid resin. A process for the removal of basic nitrogen compounds from light gasoline by extraction is studied. The ef fects of extraction conditions on the removal of basic nitrogen compounds are in vestigated. The experimental results indicate that the temperature has little ef fect on the removal rate of basic nitrogen compounds at the temperature of 20 ～ 40 ℃; the removal rate increases with the increase of the water/oil ratio, the s ubsidence time and the frequency of water extraction. Under the conditions, such as a room temperature, a water/oil ratio of 0.05, the liberation time of 20 m inutes and subsidence time of 15 minutes, twice water extraction and once deion ized water extraction, the removal rate of basic nitrogen compounds is more than 87% and the yield of light gasoline approaches 100%, which meet the requireme nt of etherification catalyst on the etherification feeds. Water extraction is an economical and effective method that is applied to remove basic nitrogen comp ounds in FCC light gasoline.