低生焦、高液体产品产率的催化裂化工艺研究

STUDY ON FLUID CATALYTIC CRACKING PROCESS WITH LOW COKE AND HIGH LIQUID PRODUCT YIELD

针对加氢重油催化裂化过程碳排放主要来自烧炭再生过程和焦炭产率过高导致碳原子经济性差的问题,提出了优化催化裂化原料性质和提高焦炭产率突变点对应的转化率的技术思路;进而,形成了低生焦、高液体产品产率的催化裂化工艺,并根据目标产品的不同形成了多产燃料油组分、兼产汽油技术方案与多产丙烯、丁烯和燃料油组分方案。结果表明:采用溶剂脱沥青工艺优化加氢重油原料性质后,使用大孔Y分子筛(CGP-1)催化剂的多产燃料油组分、兼产汽油技术方案的焦炭产率降幅为39.52%,液体产品产率增加5.84百分点;使用中孔MFI分子筛(TCC-1)催化剂的多产丙烯、丁烯和燃料油组分方案的焦炭产率降幅为80.05%,液体产品产率提高12.22百分点。

In view of the fact that the carbon emission from the catalytic cracking mainly comes from the regeneration process and the poor carbon atom economy caused by the high yield of coke,the technical ideas of optimizing the properties of FCC feedstock and improving the whole conversion rate at the fast rising point of coke yield were put forward.A new fluid catalytic cracking process with low coke yield and high liquid product yield was developed,and according to the different target products,two technical schemes of①producing more fuel oil,gasoline and②produing more propylene,butene and marine fuel oil were formed.The results showed that the coke yield decreased by 39.52%by using macroporous Y zeolite(CGP-1 catalyst)to produce more marine fuel oil and gasoline after optimizing the raw material properties by solvent deasphalting,the yield of liquid product increased by 5.84 percentage points.The yield of coke using the mesoporous MFI zeolite(TCC-1 catalyst)for increasing the yield of propylene,butene and fuel oil components decreased by 80.05%,and the yield of liquid products increased by 12.22 percentage points.