异丙醇铝水解制高纯拟薄水铝石

doi:10.19964/j.issn.1006-4990.2021-0233

Abstract

Abstract:

Pseudo-boehmite was prepared by hydrolysis of aluminium isopropoxide.The effect of water dosages（the molar ratio of water to aluminum isopropanol was 2∶1~4.5∶1）,hydrolysis time（0~3 h）,drying temperature（75~120 ℃） and drying time（2~10 h） on the residual carbon content,crystal phase,dispersion index and hydration effect were investigated.The results showed that the changes of preparation conditions all affected the carbon content of the product,and the effect of water dosage was the most obvious.With the increase of water dosage,the crystal form of the product was continuously improved,and the dispersion index increased from 2.3% to more than 95%.Prolonging the hydrolysis time was beneficial to the grain growth of pseudo-boehmite and the increase of dispersion index（from 35.4% to more than 65%）.Drying temperature and drying time had little effect on the crystal form and dispersion index of pseudo-boehmite.In addition,after the hydration of the obtained products,the dispersion index of the products had been greatly improved.When the ratio of water to aluminum isopropanol in the hydrolysis process was more than 3∶1,the dispersion index could reach more than 99% after hydration,which provided a research basis for the industrialization of the preparation of pseudo-boehmite by the hydrolysis of aluminium isopropoxide.

Key words: aluminum isopropoxide, high purity pseudo-boehmite, carbon content, dispersion index, hydration

CLC Number:

TQ133.1

TIAN Peng,LI Wei,YANG Yuzhe,LIU Kunji,XU Qianjin,NING Guiling. Preparation of high purity pseudo-boehmite by hydrolysis of aluminium isopropanol[J]. Inorganic Chemicals Industry, 2022, 54(2): 54-59.

Figures/Tables 9

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References 21

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样品	n（水）∶ n（异丙醇铝）	水解搅拌时间 /h	真空干燥温度/℃	真空干燥时间 /h
1	2.0∶1	2.0	95	4
2	2.5∶1	2.0	95	4
3	3.0∶1	2.0	95	4
4	3.5∶1	2.0	95	4
5	4.0∶1	2.0	95	4
6	4.5∶1	2.0	95	4
7	3.5∶1	0.0	95	4
8	3.5∶1	0.5	95	4
9	3.5∶1	1.0	95	4
10	3.5∶1	1.5	95	4
11	3.5∶1	3.0	95	4
12	3.5∶1	2.0	75	4
13	3.5∶1	2.0	85	4
14	3.5∶1	2.0	105	4
15	3.5∶1	2.0	120	4
16	3.5∶1	2.0	95	2
17	3.5∶1	2.0	95	6
18	3.5∶1	2.0	95	10

n（水）∶ n（异丙醇铝）	水化前胶溶指数/%	水化后胶溶指数/%	n（水）∶ n（异丙醇铝）	水化前胶溶指数/%	水化后胶溶指数/%
2.0∶1	2.31	94.22	3.5∶1	73.28	99.05
2.5∶1	19.41	97.38	4.0∶1	96.71	99.20
3.0∶1	47.60	98.88	4.5∶1	95.48	99.46

水解时间/h	水化前胶溶指数/%	水化后胶溶指数/%	水解时间/h	水化前胶溶指数/%	水化后胶溶指数/%
0.0	35.44	99.06	1.5	59.23	99.68
0.5	42.12	99.76	2.0	73.28	99.05
1.0	57.61	99.52	3.0	65.09	99.46

干燥温度/℃	水化前胶溶指数/%	水化后胶溶指数/%	干燥温度/℃	水化前胶溶指数/%	水化后胶溶指数/%
75	68.70	99.04	105	76.66	99.10
85	70.79	99.76	120	46.97	99.44
95	73.28	99.05

干燥时间/h	水化前胶溶指数/%	水化后胶溶指数/%	干燥时间/h	水化前胶溶指数/%	水化后胶溶指数/%
2	76.67	99.33	6	72.36	99.37
4	73.28	99.05	10	75.06	99.40

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Inorganic Acid-Base-Salt Committee of CIESC

Preparation of high purity pseudo-boehmite by hydrolysis of aluminium isopropanol

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