氧化铝载体工业焙烧条件对孔性质的影响  

EFFECT OF INDUSTRIAL CALCINATION CONDITIONS ON PORE PROPERTIES OF ALUMINA CARRIERS

作　　者：王方平 刘辉 郭笑荣 吴兵 熊彬 梁琼 吴新辉 陈鑫 Wang Fangping;Liu Hui;Guo Xiaorong;Wu Bing;Xiong Bin;Liang Qiong;Wu Xinhui;Chen Xin(SINOPEC Catalyst Co.Ltd.,Changling Branch,Yueyang,Hunan 414000)

机构地区：[1]中国石化催化剂有限公司长岭分公司,湖南岳阳414000

出　　处：《石油炼制与化工》2021年第2期46-50,共5页Petroleum Processing and Petrochemicals

摘　　要：考察了加氢催化剂工业制备过程中载体焙烧炉类型、网带窑的网带运行频率、料层厚度、焙烧温度、改性气体流量和转炉预焙烧温度等生产工艺因素对氧化铝载体孔性质的影响。结果表明:工业焙烧氧化铝载体时,转炉焙烧的载体比表面积小,孔径为2~6 nm的孔体积分布比例低,孔径为6~20 nm的孔体积分布比例高;无气体改性时,网带窑焙烧的载体比表面积大,但孔径为2~6 nm的孔体积分布比例相对较高,孔径为6~20 nm的孔体积分布比例相对较低;网带窑焙烧载体时经适当气体改性和其他工艺优化后,可降低孔径为2~6 nm的孔体积分布比例,增加孔径为6~20 nm的孔体积分布比例。网带窑优化工艺条件为:焙烧温度(基准+15)℃,运行频率(基准+2)Hz,料层厚度(基准+8)cm,改性气体量(基准+20)m^3 h。转炉焙烧载体时通过预焙烧温度的调整也可进行优化,在预焙烧温度为(基准+140)℃时,孔径为6~20 nm的孔体积分布比例可达91.22%。The effects of carrier roasting furnace type,mesh belt running frequency,carrier bed thickness,roasting temperature,modified gas flow rate and converter pre-roasting temperature on the pore properties of alumina carrier were investigated.The results showed that the specific surface area of alumina carrier calcined by converter was smaller,the volume distribution ratio of the pore diameter of 2—6 nm was low,while the volume distribution ratio of the pore diameter of 6—20 nm was high.Without gas modification,the carrier calcined in mesh belt kiln had a larger specific surface area,but the volume distribution ratio of the pore diameter of 2—6 nm was relatively high and the volume distribution ratio of the pore diameter of 6—20 nm was relatively low.With proper gas modification and other process condition optimization,the pore volume distribution ratio of the pore diameter of 2—6 nm could be reduced and the volume distribution ratio of the pore diameter of 6—20 nm increased.The optimized process conditions of mesh belt kiln were as follows:roasting temperature(benchmark+15)℃,electricity frequency(benchmark+2)Hz,material layer thickness(benchmark+8)cm,modified gas amount(benchmark+20)m^3 h.When the carrier was roasted in converter,it could be optimized by adjusting the pre-roasting temperature.When the pre-roasting temperature was(benchmark+140)℃,the volume distribution ratio of the pore diameter of 6—20 nm could reach 91.22%.

关 键 词：孔分布 载体 网带窑 转炉 改性气体 

分 类 号：TE624.93[石油与天然气工程—油气加工工程]