水热老化对增产丙烯助剂性能影响的研究

doi:10.19964/j.issn.1006-4990.2023-0445

Abstract

Abstract:

Using a fixed⁃bed aging device，the compounded propylene additives for increasing propylene production in catalytic cracking were subjected to 0，4，8，12 h and 24 h of hydrothermal aging under atmospheric pressure at a hydrothermal aging temperature of 800 ℃ and 100% water vapor，respectively，and the aging additives were evaluated for their ACE responses using X-ray diffractometry，N₂ adsorption-desorption and pyridine adsorption infrared spectroscopies for the characterization of the aging additives.The results showed that as the aging time increased from 0 h to 24 h，the increase in propylene production of the propylene additives was decreased from 7.15% for the fresh additives to 4.02% for the aged 24 h additives，the relative crystallinity was decreased from 20% to 15%，the microporous surface area was decreased from 57 m²/g to 32 m²/g，and the ratio of strong L-acid/total L-acid was decreased from 0.33 to 0.16.The study showed that with the extension of aging time，the relative crystallinity of additive ZSM-5 was decreased，the microporous specific surface area was decreased，and the ratio of strong L-acid/total L-acid was decreased rapidly，all of which indicated that the decrease in the propylene production enhancement performance of the propylene additives was mainly due to the structural damage of the active component，ZSM-5 molecular sieve，under the condition of high temperature and hydrothermal heat.

Key words: catalytic cracking, propylene additive, hydrothermal stability, aging time, ZSM-5

CLC Number:

O643

ZHAO Mingzhi, DUAN Hongchang, SUN Xueqin, LÜ Penggang, LI Xueli, LIU Tao, CAO Gengzhen. Study on effect of hydrothermal aging on physicochemical properties of propylene additives[J]. Inorganic Chemicals Industry, 2024, 56(7): 55-60.

Figures/Tables 14

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编号	转化率/ %	产物分布/%												轻收/ %	总液收/%	丙烯选择性/%
		干气			液化气					汽油	柴油	重油	焦炭
		H₂	CH₄	C₂H₄	C3	C3=	n-C4	i-C4	C4=	汽油	柴油	重油	焦炭
主剂+助剂-1	82.47	0.07	0.85	2.87	2.29	14.00	1.29	6.53	11.86	35.79	11.91	5.62	6.03	47.7	83.67	38.92
主剂+助剂-2	82.87	0.06	0.86	2.29	2.05	13.62	1.26	6.51	11.95	37.29	11.59	5.54	6.08	48.88	84.27	38.49
主剂+助剂-3	82.32	0.06	0.85	1.64	1.84	12.62	1.18	6.10	11.70	39.55	12.13	5.55	5.96	51.68	85.11	37.75
主剂+助剂-4	82.29	0.06	0.87	1.35	1.74	11.94	1.16	5.96	11.35	41.90	12.17	5.54	5.95	53.26	85.41	37.14
主剂+助剂-5	82.04	0.06	0.87	1.08	1.6	10.87	1.12	5.68	11.04	42.95	12.12	5.84	5.94	55.07	85.38	35.86
主剂	83.91	0.06	1.01	0.73	1.36	6.85	1.21	5.31	8.59	51.51	11.28	4.81	6.37	62.79	86.11	29.37

样品	总比表面积/ （m²·g^-1）	微孔比表面积/（m²·g^-1）	总孔体积/ （cm³·g^-1）	微孔体积/ （cm³·g^-1）
助剂-1	72	57	0.06	0.03
助剂-2	78	53	0.09	0.03
助剂-3	75	38	0.09	0.02
助剂-4	86	36	0.08	0.02
助剂-5	78	32	0.08	0.02

样品	酸量/（μmol·g^-1）
	150 ℃				350 ℃
	B酸	L酸	B+L	B/L	B酸	L酸	B+L	B/L
助剂-2	16	31	47	0.5	13	15	28	0.9
助剂-3	13	26	39	0.5	13	6	19	2.1
助剂-4	8	22	30	0.3	3	5	8	0.6
助剂-5	3	16	19	0.2	0	3	3	0.0

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Inorganic Acid-Base-Salt Committee of CIESC

Study on effect of hydrothermal aging on physicochemical properties of propylene additives

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