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Current Issue
1987 Vol.4 Issue.4,
Published 1987-10-15
Article
Article
1
Gas-Liquid Dispersion and Mass Transfer Characteristics in a Stirred Vessel
Chen Xiao-Guo Zhu Zi-Qiang Luo You-Shou
This paper consists of two parts dealing with gas-liquid dispersion and mass transfer characteristics in stirred vessel. In part(I), an apparatus equipped with optical and microprocessor for measuring the interfacial area by light scattering method is described and the results of measurement of interfacial area, gas-hold up and mass transfer coefficients are presented. Based on the rising motion of a single bubble in static liquid of infinite dimension and on the isotropic turbulance theory, the rising velosity of a single bubble in turbulent liquid has been derived, with some reasonable assumptions, We have obtained the relationships between gas-hold up, interfacial area and other operating varibles, and they can correlate well the experimental data. In part(Ⅱ), the relationships of surface-renewing frequency, turbulent parameters and operational varibles have been derived, combining the equa-tions derived in part(I) and part(Ⅱ), the mass transfer coefficients ha-ve been calculated. The agreement with the experimental data is satisfac-tory.
1987 Vol. 4 (4): 1-13 [
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14
A Review on the Active Phase of Hydrodesulfurization Catalysts
Li Yong-Dan Zhang Liu
In recent years, much insight has been got into the chemical Pro-perties of transition-metal sulfides, their structure and their hydro-desulfurization(HDS) behaviour, as well as the interrelationships between these characteristics. The suggested and proved Co-Mo-S structure model of commercial HDS catalysts reveals better under-standing of the active phase and the mechanism in the HDS process. The success in the study of the structure and its HDS activity of Chevrel Compounds has opened up a new way to catalyst optimiza-tion. This paper reviews the recent advances in HDS catalyst rese-arch. A great effort has been made to illustrate the relation between the development of theory and technology, The successful application of two novel techniques MES(Mossbauer emission spectroscopy) and EXAFS(Extended X-ray absorption fine structure) to the study of the HDS catalysts is also described.
1987 Vol. 4 (4): 14-21 [
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1518
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5
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1987 Vol. 4 (4): 22-28 [
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1681
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6
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29
1987 Vol. 4 (4): 29-35 [
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1393
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6
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36
1987 Vol. 4 (4): 36-38 [
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1381
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6
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39
1987 Vol. 4 (4): 39-43 [
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1376
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6
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44
1987 Vol. 4 (4): 44-48 [
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1380
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5
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49
1987 Vol. 4 (4): 49-52 [
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1353
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6
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53
1987 Vol. 4 (4): 53-56 [
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1384
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6
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57
1987 Vol. 4 (4): 57-62 [
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1550
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62
1987 Vol. 4 (4): 62-62 [
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1289
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5
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63
1987 Vol. 4 (4): 63-70 [
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1338
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71
1987 Vol. 4 (4): 71-72 [
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1227
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7
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72
1987 Vol. 4 (4): 72-76 [
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1269
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77
1987 Vol. 4 (4): 77-78 [
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1280
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