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Experimental study on optimal operation of an actual-size batch crystallizer

Research Project

Project/Area Number 09555234
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 反応・分離工学
Research InstitutionIWATE UNIVERSITY

Principal Investigator

NORIAKI Kubota  Iwate University, Faculty of Engineering, Professor, 工学部, 教授 (90003863)

Co-Investigator(Kenkyū-buntansha) HAMADA Osamu  Iwate Factory, Daiichi Pure Chemicals, Chief Engineer, 岩手工場, 主任
MASUMI Fumio  Development Center, Iwate Factory, Daiichi PureChemicals Head of the Center, 岩手工場・技術開発センター, センター長
YOKOTA Masaaki  Iwate University, Faculty of Engineering, Research assistant, 工学部, 助手 (60250635)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥10,200,000 (Direct Cost: ¥10,200,000)
Fiscal Year 1999: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥8,000,000 (Direct Cost: ¥8,000,000)
Keywordsbatch crystallization / crystal size distribution / crystallizer operation / potassium alum / natural cooling / seeding / mono-disperse / 単分散
Research Abstract

Batch crystallization can be used for the production of a variety of fine chemicals in small scale. It has flexibility in operation. But, the method for control of crystal size, which has been long desired has not be established yet. In this research project, the effect of seeding on the product crystal size distribution was investigated experimentally using both large and small scale batch cooling crystallizers. The aim of this research was to establish the method for crystal size control. Experimental work was made with the potassium alum system. As a cooling mode, quenching (natural cooling) method was mainly employed. For comparison, the other methods, linear and controlled cooling methods, were also tested.
At first, a small scale crystallizer (12 L) was used to investigate the effect of seed amount and initial solution concentration on the crystal size distribution of product. The size distribution of product crystals has been found to become uni-modal under the condition of enoug … More h seeding over a critical seed concentration. Under this condition, the product crystals were all grown seeds. The same result was obtained for solutions for high initial concentration. Even for the large scale crystallizer (600L) used, the uni-modal crystal size distribution was confirmed similarly to be obtained under the condition of enough seeding.
In addition to the above experiments, the generation rate of fine crystals was measured to clarify the mechanism for the seeding effect on the production of uni-modal size distribution. Agglomeration (or sticking) of fine crystals to seed crystals and the short period of high supersaturation were shown to play important roles. By comparing the quenching method with the other cooling modes, the cooling mode itself was shown not to be an important factor in producing crystals of uni-modal size distribution. 'It is the seed amount that plays an important role.
The results obtained in this project is expected to be extended to a useful and practical design method of a batch crystallizer for the production of the crystals of controlled size. Part of the results obtained in this project have been published in international journals (5 papers) and presented in meetings and symposia (1 6 papers). Less

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report

Research Products

(11 results)

All Other

All Publications (11 results)

  • [Publications] Jagadesh D.,N.Kubota,M.Yokota,N.Doki and A.Sato: "Seeding effect on batch crystallization of potassium alum under natural cooling mode and a simple design method of crystallizer"Journal of Chemical Engineering of Japan. Vol.32. 514-520 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Doki,N.,Kubota,A.Sato,M.Yokota,O.Hamada,F.Masumi: "Scale-up effect on Seeded Batch Cooling Crystallization of Potash Alum"AIChE journal. Vol.45. 2527-2533 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] N.Doki.N.Kubota,A.Sato and M.Yokota: "Effect of cooling mode on product crystal size in seededbatch crystallization of potassium alum"Chemical Engineering Journal. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Noriaki Kubota1,Norihito Doki,Masaaki Yokota and Akira Sato: "Seeding Policy in Batch Cooling Crystallization"Powder Technology. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] N. Kubota: "design of a batch crystallizer and scale-up (in Japanese)"Text for a training course Advanced Course of Chemical Engineering (Industrial Crystallization). 18-39, JSCE Kansai Branch. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Jagadesh. D., N. Kubota. M. Yokota. N. Doki and A. Sato: "seeding effect on batch crystallization of potassium alum under natural cooling mode and a simple design method of crystallizer"Journal of Chemical Engineering of Japan. 32. 514-520 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Doki, N., N. Kubota, A. Sato, M. Yokota,, O. Hamada, F. Masurmi: "Scale-up effect on Seeded Batch Cooling Crystallization of Potash Alum"AIChE journal. 45. 2527-2533 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Jagadesh D., N.Kubota, M.Yokota, N.Doki and A.Sato: "Seeding effect on batch crystallization of potassium alum under natural cooling mode and a simple design method of crystallizer"Journal of Chemical Engineering of Japan. vol.32. 514-520 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] N.Doki,N.Kubota, A.Sato, M.Yokota, O.Hamada, F.Masumi: "Scale-up effect on Seeded Batch Cooling Crystallization of Potash Alum"AIChE journal. vol.45. 2527-2533 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] N.Doki, N.Kubota, A.Sato and M.Yokota: "Effect of cooling mode on product crystal size in seeded batch crystallization of potassium alum"Chemical Engineering Journal. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Noriaki Kubota, Norihito Doki, Masaaki Yokota and Akira Sato: "Seeding Policy in Batch Cooling Crystallization"Powder Technology. (in press). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1997-03-31   Modified: 2016-04-21  

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