Size-controlled production of quinacridone nanocrystals using hot compressed water recrystallization method

Kiwamu Sue, Toshihiko Usami, Kunio Arai, Hitoshi Kasai, Hachiro Nakanishi, Toshihiko Hiaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Continuous production of quinacridone nanocrystals via a hot compressed water (HCW) recrystallization method was studied using a flow-through experimental apparatus at 24 MPa at temperatures from 523 K to 573 K. Quinacridone crystals were dissolved in HCW and precipitation was initiated by mixing with room temperature water (RTW), which gave the nanocrystalline product. Polyoxyethylene lauryl ether and sodium dodecyl sulfate were found to be useful for reducing aggregation of the nanocrystals. The effects of temperature and flow rate on the size of the crystals were examined; increasing the degree of supersaturation caused crystals to decrease in size. Nanocrystals that had an average diameter of ca. 36 nm could be obtained at 573.8 K and 24 MPa at a flow rate of 10 g/min for HCW and 100 g/min for RTW.

Original languageEnglish
Pages (from-to)632-635
Number of pages4
JournalDyes and Pigments
Volume76
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • Continuous production
  • Hot compressed water
  • Nanocrystal
  • Quinacridone
  • Recrystallization
  • Red pigment

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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