催化裂化汽油砷化物分布规律

doi:10.16085/j.issn.1000-6613.2018-1976

摘要/Abstract

摘要：

采用自动快速蒸馏装置对脱砷前后的催化裂化汽油进行窄馏分切割，利用原子荧光光谱法对各窄馏分砷化物含量进行分析，研究催化汽油脱砷前后砷化物分布规律，为催化裂化汽油脱砷剂开发及脱砷工艺流程选择提供指导。实验结果表明：随着各窄馏分沸点增加，砷化物所占比例逐渐增大，90%以上砷化物均分布在80℃以上的重汽油组分中，尤其170℃以上馏分砷化物所占比例陡增，占总砷化物65.82%~96.31%。吸附脱砷剂对汽油150℃之前馏分中砷化物实现了全部脱除，而对150℃之后的重馏分脱砷率略有下降；临氢脱砷剂对汽油中80℃之前轻馏分和170℃之后重馏分中砷化物具有较高的脱除率，达到90%以上，而对中间馏分中砷化物脱除率较低。

关键词: 催化裂化汽油, 窄馏分切割, 砷化物, 分布, 选择性

Abstract:

The narrow fraction cutting of FCC gasoline before and after dearsenification were carried out in a flash distillation apparatus. The arsenide content in narrow fractions were analyzed by Atomic Fluorescence Spectrometry(AFS), and the arsenic distribution laws were studied, which provided guidance for the development of de-arsenic catalyst and the selection of arsenic removal process. The experimental results showed that the proportion of arsenide was increasing with the increase of the boiling point of narrow fraction, and more than 90% arsenide was in the heavy gasoline component (≥80℃). In particular, the proportion of arsenide in the fraction above 170℃ increased sharply, accounting for 65.82%-96.31% of the total arsenide. For adsorption dearsenification, the arsenic in the fraction of gasoline before 150℃ was all removed, and the dearsening rate of heavy distillates above 150℃ decreased slightly. For hydrogenation dearsenification, the arsenic removal rates for the light fractions before 80℃ in gasoline and the heavy fractions after 170℃ were both higher than 90%, while that for the middle fraction was lower.

Key words: catalytic cracking gasoline, narrow fraction cutting, arsenide, distribution, selectivity

中图分类号:

TE624

鞠雅娜,李阳,刘坤红,王丽涛,李天舒,胡亚琼,冯琪,姜增琨,张然. 催化裂化汽油砷化物分布规律[J]. 化工进展, 2019, 38(08): 3688-3694.

Yana JU,Yang LI,Kunhong LIU,Litao WANG,Tianshu LI,Yaqiong HU,Qi FENG,Zengkun JIANG,Ran ZHANG. Study on the distribution laws of arsenide in the full-range FCC gasoline[J]. Chemical Industry and Engineering Progress, 2019, 38(08): 3688-3694.

图/表 9

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项目	A	B	C	D	分析方法
密度(20℃)/g·cm^-3	0.724	0.730	0.713	0.716	SH/T 0604—2000
硫含量/mg·kg^-1	143	377	111	173	SH/T 0253—1992
馏程/℃
IBP	32	30	33	37	ASTM D86
50%	89	107	77	88
FBP	195	189	191	198
PONA（族组成，体积分数）/%
PONA（族组成，体积分数）/%
烷烃	33.95	32.85	41.63	50.37	ASTM D5134-98
烯烃	41.76	35.16	27.7	26.83
环烷烃	10.06	11.35	8.08	8.82
芳烃	14.23	20.64	22.59	14.00

项目	A	B	C	D	分析方法
密度(20℃)/g·cm^-3	0.724	0.730	0.713	0.716	SH/T 0604—2000
硫含量/mg·kg^-1	143	377	111	173	SH/T 0253—1992
馏程/℃
IBP	32	30	33	37	ASTM D86
50%	89	107	77	88
FBP	195	189	191	198
PONA（族组成，体积分数）/%
PONA（族组成，体积分数）/%
烷烃	33.95	32.85	41.63	50.37	ASTM D5134-98
烯烃	41.76	35.16	27.7	26.83
环烷烃	10.06	11.35	8.08	8.82
芳烃	14.23	20.64	22.59	14.00

馏分号	馏程/℃	收率（质量分数）/%
馏分号	馏程/℃	A	B	C	D
F1	IBP～60	28.69	30.70	40.56	40.62
F2	60～80	12.32	9.78	13.00	10.92
F3	80～100	12.63	8.31	9.97	11.38
F4	100～130	13.59	19.76	10.47	12.59
F5	130～150	10.68	13.34	7.14	12.03
F6	150～170	11.19	8.66	7.14	8.66
F7	170～FBP	10.89	10.04	12.48	4.54

馏分号	馏程/℃	收率（质量分数）/%
馏分号	馏程/℃	A	B	C	D
F1	IBP～60	28.69	30.70	40.56	40.62
F2	60～80	12.32	9.78	13.00	10.92
F3	80～100	12.63	8.31	9.97	11.38
F4	100～130	13.59	19.76	10.47	12.59
F5	130～150	10.68	13.34	7.14	12.03
F6	150～170	11.19	8.66	7.14	8.66
F7	170～FBP	10.89	10.04	12.48	4.54

砷化物	分子式	沸点/℃
甲胂	AsH₃	-55
二甲胂	CH₃AsH₂	2
乙胂	(CH₃)₂AsH	35.6
三甲胂	C₂H₅AsH₂	36
三乙胂	(CH₃)₃As	52
二苯基甲胂	(C₂H₅)₃As	140
三苯基胂	(C₆H₅)₂AsH	161
甲胂	(C₆H₅)₃As	360