摘要
低水比乙苯脱氢催化剂的最佳配方(份,质量,下同)为:氧化铁70~72,碳酸钾13,草酸铈8~10,钼酸铵1~2,氧化镁1~2,氧化钙1~2,氢氧化钠1。在此配方下,各化合物混合1 h后加入200 m L去离子水,捏合约1 h可制备外径为2.8~3.2 mm,长度为6~8 mm,堆密度为(1.35±0.05)g/m L,侧压强度为25~30 N/mm的低水比乙苯脱氢催化剂。在等温装置和4 L绝热负压侧线装置上,分别对催化剂的主组成、活性及稳定性进行了评价。结果表明:于等温装置上,在碳酸钾用量为13份,以氢氧化钠为钠源(1份,焙烧后加入)的条件下,与碳酸钠相比,前者催化剂活性较高,乙苯转化率达到79.0%,苯乙烯选择性为96.5%;于绝热负压侧线装置上,在低水比为1.05下连续运行500 h时,采用自制低水比乙苯脱氢催化剂的乙苯平均转化率保持在66%以上,苯乙烯平均选择性在97%以上,催化剂表现出良好的活性和稳定性。
The dehydrogenation benzene （ water optimum formula catalyst with low ratio, mass ratio） of ethylbenzene vapour/ethyl- was iron oxide 70 - 72 phr （ mass, similarly hereinafter） , potassium carbonate 13 phr, cerous oxalate 8 - 10 phr, ammoni- um molybdate 1 -2 phr, magnesium oxide 1 -2 phr, calcium oxide 1 -2 phr, sodium hydroxide 1 phr. Under this formula, ethylbenzene dehydrogenation catalyst with low water ratio was prepared and its properties were outer diameter 2.8 - 3.2 mm,length 6 -8 mm, stack density （ 1.35 ± 0.05） g/mL and lateral pressure strength 25 -30 N/mm after mixing each compound for 1 h, adding 200 mL deionized water and kneading for 1 h. The activity and stability of the catalyst was investigated in an isothermal de- vice and a 4 L adiabatic side line device. The resultsshowed that in an isothermal device, under the con- ditions of amount of potassium oxide 13 phr,sodium hydroxide as sodium source （1 phr, adding after ac- tive ingredient roasting） ,compared with sodium car- bonate ,the former exhibited the higher catalytic ac- tivity, the ethylbenzene conversion reached to 79.0% ,and the selectivity of styrene was 96.5%. In an adiabatic negative pressure side line device, under the conditions of low water ratio 1.05, the cat- alyst running continuously for more than 500 h, the average conversion of ethylbenzene was no less than 66% and the selectivity of styrene was above 97%. The catalyst showed good activity and stability.
作者
杨红强
柏介军
刘敏
何崇慧
全民强
刘俊涛
王继龙
YANG Hong - qiang;BAI Jie - jun;LIU Min;HE Chong - hui;QUAN Min - qiang;LIU Jun - tao;WANG Ji - long(Lanzhou Petrochemical Research Center, PetroChina, Lanzhou 730060, Chin)
出处
《石化技术与应用》
CAS
2017年第6期447-450,共4页
Petrochemical Technology & Application
关键词
乙苯
脱氢催化剂
苯乙烯
水蒸气/E
苯
乙苯转化率
苯乙烯选择性
ethylbenzene
dehydrogenation cata-lyst
styrene
vapour/ethylbenzene
ethylbenzene con-version
styrene selectivity
