摘要
以拟薄水铝石为晶种、异丙醇为添加剂,从铝酸钠溶液中析出了具有活性Al_2O_3前体特性的拟薄水铝石。研究了异丙醇添加量、Al_2O_3质量浓度、苛性比(铝酸钠溶液中Na_2O和Al_2O_3的摩尔比)和晶种循环使用次数对铝酸钠溶液分解率(简称分解率)的影响。实验结果表明,异丙醇能有效强化铝酸钠溶液的种分过程,在Al_2O_3质量浓度为110 g/L、苛性比为1.50、晶种比(晶种与铝酸钠溶液中Al_2O_3的质量比)为1.0、125℃的温和水热条件下种分3 h时,添加5 mg/L异丙醇可使分解率从不添加异丙醇时的27.2%提高到46.7%,并且晶种连续循环使用3次后,分解率仍达到36.5%。添加异丙醇不改变种分产物的晶型,对其形貌和织构性质也没有显著影响,但可在一定程度上调节其结晶度并使孔分布更集中。
Pseudo-boehmite as precursor of activated A1203 precipitated from sodium aluminate （SA） solution by using pseudo-boehmite from Shandong aluminum plant as seed and isopropanol as additive. Effects of isopropanol addition amount, mass concentration of Al2O3 in SA solution, n （ Na2O） ： n （ Al2O3 ） in SA solution and precipitation cycle times of the seed on seed precipitation yield of Al2O3 were investigated. Under seed precipitation conditions： Al2O3 mass concentration in SA solution 110 g/L, n（Na2O） ： n（Al2O3） 1.50,mass ratio of seed to A1203 in SA solution 1.0, seed precipitation time 3 h and temperature 125 ℃, the addition of isopropanol 5 mg/L remarkably promoted the seed precipitation yield of Al2O3 from 27.2% to 46.7%. Since the seed used in every next seed precipitation was taken from the previous, the seed precipitation yield of Al2O3 generally decayed from cycle to cycle. Without addition of isopropanol, the seed precipitation yield of Al2O3 lowered from 27.0% to 18. 8% after 3 cycles of seed precipitation. But with addition of isopropanol, the seed precipitation yield of Al2O3 could still keep at a high level of 36.5% after 3 cycles. XRD, SEM and N2 adsorption-desorption results showed that with addition of isopropanol the obtained pseudo-boehmite kept the same crystal structure, similar morphology and pore volume, but its pore distribution became narrower and its crystallinity could be adjustable to some extent
出处
《石油化工》
CAS
CSCD
北大核心
2009年第10期1059-1064,共6页
Petrochemical Technology
基金
中国博士后科学基金面上资助一等资助项目(20080440142)
国家大学生创新性实验计划项目(081194644)
关键词
拟薄水铝石
异丙醇
种分
水热法
铝酸钠溶液
pseudo-boehmite
isopropanol
seed precipitation
hydrothermal method
sodium aluminate solution
