Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed
In order to improve the traditional freezing crystallization process of calcium nitrate in nitric phosphate process, crystal growth experiments by adding Ca(NO3)2·4H2O seeds in supersaturated calcium nitrate solution in a Circulating Fluidized Bed (CFB) crystallizer were carried out on crystal growt...
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| Format: | Article |
| Language: | English |
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Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
2018-10-01
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| Series: | Iranian Journal of Chemistry & Chemical Engineering |
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| Online Access: | http://www.ijcce.ac.ir/article_32439_996954f3860bdacf991cd45de95f3b01.pdf |
| _version_ | 1811293631202459648 |
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| author | Liu Dechun Zhu Jiahua |
| author_facet | Liu Dechun Zhu Jiahua |
| author_sort | Liu Dechun |
| collection | DOAJ |
| description | In order to improve the traditional freezing crystallization process of calcium nitrate in nitric phosphate process, crystal growth experiments by adding Ca(NO3)2·4H2O seeds in supersaturated calcium nitrate solution in a Circulating Fluidized Bed (CFB) crystallizer were carried out on crystal growth kinetics. The results showed that the growth of Ca(NO3)2·4H2O crystals is a complicated mass transfer process. The mean mass crystal growth rate (RG) of Ca(NO3)2·4H2O increased linearly with the fluid circulated velocity at fixed relative supersaturation and enlarged with relative supersaturation increasing. The crystallization kinetics follows the first order equation. The overall activation energy and the order of the overall growth kinetics of Ca(NO3)2·4H2O crystals were calculated by the isothermal method. The RG of Ca(NO3)2·4H2O crystals remains basically stationary within the entire crystallization time in the CFB crystallizer. The results have a deep significance to exploit a new CFB crystallization process for the production of Ca(NO3)2·4H2O crystals instead of the traditional one. |
| first_indexed | 2024-04-13T05:04:21Z |
| format | Article |
| id | doaj.art-44526fb9a94048d58400175fcdeb0f38 |
| institution | Directory Open Access Journal |
| issn | 1021-9986 1021-9986 |
| language | English |
| last_indexed | 2024-04-13T05:04:21Z |
| publishDate | 2018-10-01 |
| publisher | Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR |
| record_format | Article |
| series | Iranian Journal of Chemistry & Chemical Engineering |
| spelling | doaj.art-44526fb9a94048d58400175fcdeb0f382022-12-22T03:01:13ZengIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry & Chemical Engineering1021-99861021-99862018-10-01375677332439Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized BedLiu Dechun0Zhu Jiahua1School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, P.R. CHINASchool of Chemical Engineering, Sichuan University, Chengdu 610021, Sichuan, P.R. CHINAIn order to improve the traditional freezing crystallization process of calcium nitrate in nitric phosphate process, crystal growth experiments by adding Ca(NO3)2·4H2O seeds in supersaturated calcium nitrate solution in a Circulating Fluidized Bed (CFB) crystallizer were carried out on crystal growth kinetics. The results showed that the growth of Ca(NO3)2·4H2O crystals is a complicated mass transfer process. The mean mass crystal growth rate (RG) of Ca(NO3)2·4H2O increased linearly with the fluid circulated velocity at fixed relative supersaturation and enlarged with relative supersaturation increasing. The crystallization kinetics follows the first order equation. The overall activation energy and the order of the overall growth kinetics of Ca(NO3)2·4H2O crystals were calculated by the isothermal method. The RG of Ca(NO3)2·4H2O crystals remains basically stationary within the entire crystallization time in the CFB crystallizer. The results have a deep significance to exploit a new CFB crystallization process for the production of Ca(NO3)2·4H2O crystals instead of the traditional one.http://www.ijcce.ac.ir/article_32439_996954f3860bdacf991cd45de95f3b01.pdfcirculating fluidized bed (cfb)calcium nitrate tetrahydratemass transfercrystal growth ratecrystal growth kinetics |
| spellingShingle | Liu Dechun Zhu Jiahua Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed Iranian Journal of Chemistry & Chemical Engineering circulating fluidized bed (cfb) calcium nitrate tetrahydrate mass transfer crystal growth rate crystal growth kinetics |
| title | Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed |
| title_full | Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed |
| title_fullStr | Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed |
| title_full_unstemmed | Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed |
| title_short | Kinetics Influence of Operation Conditions on Crystal Growth of Calcium Nitrate Tetrahydrate in a Circulating Fluidized Bed |
| title_sort | kinetics influence of operation conditions on crystal growth of calcium nitrate tetrahydrate in a circulating fluidized bed |
| topic | circulating fluidized bed (cfb) calcium nitrate tetrahydrate mass transfer crystal growth rate crystal growth kinetics |
| url | http://www.ijcce.ac.ir/article_32439_996954f3860bdacf991cd45de95f3b01.pdf |
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