화학공학소재연구정보센터
Journal of the Korean Industrial and Engineering Chemistry, Vol.2, No.4, 399-410, December, 1991
역확산을 이용한 액체염료의 제조
The Preparation of Storage-Stable Liquid Dyes by Counter Diffusion
초록
저장 안정한 액체염료의 제조를 위하여 새로운 분리 기술을 도입하였다. 액체염료에 함유된 무기염의 종류, 농도 및 액체염료의 저장기간이 염료분자의 집합(aggregation)과 안정성에 미치는 영항을 실험측정하였다. 높은 염농도에 의한 염료분자의 집합의 형성을 방지하지 위해 표면처리한 중공사막을 이용한 역확산(counter diffusion)법을 도입하여 액체염료에 함유된 염을 선택적으로 제거하였다. 역확산에 의한 염의 제거 효율은 1회 통과에 5-20%였고 염과 염료의 분리비는 10-700으로 매우 큰 값을 갖는 반면 염료의 손실율은 0.4% 이하였다. 모델식을 이용하여 구한 염과 염료의 막에 대한 물질전달 계수 (UM, Na, UM, Dye)는 표면처리한 경우에 각각 2.75 와 0.72 l/m2/hr 의 값을 나타내어 염과 염료의 혼합액에서 염의 선택적 분리가 가능함을 보여주었다. 또한 탈거수 및 공급액의 유속, 막의 막힘현상이 염의 제거 효율에 미치는 영향을 연구하였다.
New separation process was developed for the preparation of storage-stable liquid dyes. The extent of aggregation of dye molecules was measured with respect to storage time of liquid dyes under different salt environments. Hollow-fiber membranes were modified by immobilization of inorganic crystals onto the surface of membrane. Using surface-treated membranes, counter diffusion technology was introduced to selectively remove salts from dye solution. The separation factors were 10-700, and the loss of dye molecules was less than 0.4 %. Membrane permeabilities for sodium ions(UM, Na) and dye molecules(UM. Dye) were found to be 2.75 and 0.72 l/m2/hr, respectively, in the case of surface-treated membranes. The effects of various operating parameters on desalting efficiency were also investigated.
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