摘要
为提高甲醇气相胺化合成二甲胺的选择性和催化活性,对处理液浓度、处理时间、处理次数及处理温度等酸洗条件进行了优化,并研究了甲醇气相胺化工艺条件.结果表明:优化的酸洗条件为处理液浓度2mol/L,酸洗次数4次,酸洗时间0.5h,酸洗温度80℃;优化条件不会破坏丝光沸石原有晶体结构,可以有效去除沸石孔道杂质,疏通孔道结构,提高微孔分布,并可提高活性中心的酸强度;催化剂甲醇气相胺化适宜的工艺条件是:反应温度390℃,甲醇液相空速1.93h-1,氨醇比1.8;内部积炭是催化剂失活的主要原因,反应温度应低于410℃.
In order to enhance the catalytic activity of natural mordenite （NM） for gas-phase amination of methanol with ammonia （GAMA） and selectivity of dimethylamine, the acid washing conditions, including solvent concentration, treatment temperature, treatment times, and treatment time were optimized. The process conditions for GAMA with modified NM were studied. The results show that the optimum conditions of acid washing are 2 mol/L solvent concentration, 80℃ treatment temperature, 4 times treatment and 0.5 h at a time. Acid washing treatment did not destroy crystal structure of NM but increased distribution of micro-pore size by removing impurity in pores of NM, and increased acidity in active center on NM surface. The optimal conditions of GAMA are 390 ℃reaction temperature, 1.93 h ^-1 liquid hourly space velocity and 1.8 NH3/CH3OH. The NM deactivation is mainly controlled by coke deposition on internal surface. The reaction temperature should be under 410℃ in order to avoid deactivation.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2010年第2期279-283,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(20807056)
煤炭加工与高效洁净利用教育部重点实验室开放基金项目(CPEUKF08-09)
中国矿业大学青年科研基金项目(OH080254)
关键词
天然丝光沸石
预处理
正交实验设计
甲胺
natural mordenite
pretreatment
orthogonal design
methylamine
