Composition analysis of FCC slurry and its extraction products
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摘要: 以切尾FCC油浆为原料，采用DMF和反抽提剂的复配溶剂进行抽提分离，对FCC油浆及其抽提产物的物性和组成进行了分析表征。结果表明，复配溶剂可以较好地将FCC油浆分离成以芳香烃为主的抽出相和以饱和结构为主的抽余相，在抽出油收率为58.5%时，抽出油芳香分含量80.5%，芳碳率为73.82%，所含芳烃以二环、三环和四环为主，可以作为橡胶填充油和增塑剂等的原料；抽余油饱和分含量高达90%以上，芳碳率只有2.38%，基本不含杂原子，可以作为优良的催化裂化原料。溶剂抽提可以使低附加值的FCC油浆得到较好的利用。Abstract: The physical properties and structure composition of FCC slurry and its extraction products were analyzed and characterized using light Daqing FCC slurry as feedstock and complex extraction solvent prepared by N, N-dimethylformamide (DMF) and anti-extractant. The results show that FCC slurry can be better separated into extract oil mainly composed of aromatics and raffinate oil mainly composed of saturates by complex solvent. The aromatics content of extract oil is 80.5% and the aromatic-carbon ratio is 73.82% under extract oil yield 58.5%. The extract oil can be used as raw materials for rubber filling oil and plasticizer, which mainly are composed of aromatics with bicyclic, tricyclic and tetracyclic. The raffinate oil can be used as FCC feedstock, which contains more than 90% saturates and almost without heteroatoms. Solvent extraction can efficiently use the low additional value FCC slurry.
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Key words:
- FCC slurry /
- solvent extraction /
- extraction product /
- properties /
- composition
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图 1 FCC油浆、抽余油和抽出油的红外光谱谱图
Figure 1 Infrared spectra of FCC slurry, raffinate oil and extract oil
表 1 油浆及抽提产物的理化性质
Table 1 Properties of slurry and components
Item Density/(kg·m-3) SARA①w/% Element composition w/% Ni②/(μg·g-1) V/(μg·g-1) H/C(mol ratio) saturate aromatics resin+asphaltene H C N S Slurry feedstock 1059 33.9 51.6 15.0 10.42 88.43 0.34 0.22 0.69 0.0075 1.41 FCC slurry 1013 33.7 58.5 7.7 11.17 87.69 0.26 0.19 0.51 0.0050 1.53 Raffinate oil 971 90.4 5.1 4.5 13.36 86.58 - 0.03 0.24 0.0047 1.80 Extract oil 1086 9.7 80.5 9.9 7.94 89.14 1.34 0.52 0.72 0.0049 1.08 notes: ①: analyzed by SH/0509-92; ②: determined by atomic absorption spectrometry 
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表 2 FCC油浆及其抽提产物的组成
Table 2 Compositions of FCC slurry, raffinate oil and extract oil
(w/%) Item FCC slurry Raffinate oil Extract oil Alkanes 27.04 75.45 9.39 Cycloalkanes 0.94 1.66 0.57 Olefins 4.20 5.49 2.28 Total aromatics 55.12 14.00 69.48 Monocyclic aromatics 2.14 2.16 2.13 Bicyclic aromatics 10.78 5.41 17.34 Naphthalene & alkyl naphthalene 9.02 5.24 15.31 Acenaphthylene 0.03 0.00 0.03 Fluorenes compounds 0.21 0.00 0.19 Biphenyl compounds 1.52 0.17 1.81 Tricyclic aromatics 34.15 4.12 38.78 Phenanthrene compounds 8.44 0.61 9.03 Anthracene compounds 25.71 3.51 29.75 Tetracyclic aromatics 8.05 2.31 11.23 Pyrene compounds 7.53 1.72 9.81 Chrysene compounds 0.46 0.43 1.24 Benzofluorene 0.06 0.16 0.18 Thiophene compounds 2.80 0.00 3.10 Nitrogen compounds 5.84 0.00 5.86 Other heteroatom compounds 4.39 3.39 8.86
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