摘要
通过比较4种不同类型的分子筛 HY,Hβ,HZSM-22,HZSM-5,确定了HZSM-5分子筛对二异丙苯择形催化裂化反应具有良好的性能;同时考察了 HZSM-5分子筛的粒径对二异丙苯择形催化裂化反应的影响,确定了纳米 HZSM-5分子筛对该反应的选择裂化性能最好。考察了反应温度和质量空速对二异丙苯择形催化裂化反应的影响,实验结果表明,在反应压力0.1 MPa、反应温度380℃、质量空速6 h^(-1)的条件下,纳米 HZSM-5分子筛上对二异丙苯的裂化率为93.23%,产物二异丙苯中间二异丙苯的选择性为94.20%,间二异丙苯的收率为75.68%。并经实验发现,用质量分数为0.1%的 La 改性纳米 HZSM-5分子筛可提高 HZSM-5分子筛择形催化裂化二异丙苯反应的稳定性。
Diisopropylbenzenes （DIPBs） are available by-products from synthesis of cumene by alkylation of benzene with propylene. DIPBs shape-selective catalytic cracking were investigated over four different types of molecular sieve catalysts, namely HY, Hβ, HZSM-22 and HZSM-5. HZSM-5 molecular sieve is the most efficient catalyst for the reaction. In experiments of comparing effects of different grain sizes of HZSM-5 on the reaction, nano-HZSM-5 molecular sieve catalyst exhibits the highest cracking rate and selectivity to para-DIPB. Temperature and WHSV on the reaction were investigated. Under optimized conditions： reaction pressure 0.1 MPa, reaction temperature 380 ℃, WHSV 6 h^-1, cracking rate for para-DIPB reaches 93.23%, selectivity to meta-DIPB in product DIPB 94. 20% and yield to meta-DIPB 75. 68%. When ZSM-5 molecular sieve is modified with 0.1% （ mass fraction） of lanthanum, the stability of the reaction improves obviously.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2008年第10期998-1002,共5页
Petrochemical Technology
关键词
分子筛催化剂
二异丙苯
择形催化裂化
纳米HZSM-5分子筛
镧
改性
molecular sieve catalyst
diisopropylbenzene
shape-selective catalytic cracking
nano- HZSM-5 molecular sieve
lanthanum
modification
