公开(公告)号：US20040266017A1

公开(公告)日：2004-12-30

申请号：US10821856

申请日：2004-04-12

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Myung-Suk Chun ,  Jae-Jin Kim ,  Sang Yup Lee

IPC: G01N027/416 ,  C02F001/44

CPC classification number: G01N27/60 ,  B01D61/12 ,  B01D61/22 ,  B01D65/08 ,  B01D65/10 ,  B01D2321/22 ,  Y10T436/25375

Abstract: The present invention relates to an apparatus for monitoring the progress of membrane fouling that occurs on pores as well as on the surface of a membrane by means of variations of zeta potential (null) of a hollow-fiber membrane according to time passage of filtration of a suspension, wherein colloid particles, biopolymers and other inorganic particles are dispersed, and the method thereof. Moreover, the present invention also relates to a method to identify the effect of concentration polarization layer and cake layer which can vary according to the axial position of a hollow-fiber and the developing progress of a membrane fouling by measuring the position-dependent zeta potential of the hollow-fiber membrane.

公开(公告)号：US20030233014A1

公开(公告)日：2003-12-18

申请号：US10452220

申请日：2003-06-03

Applicant: Korea Institute of Science and Technology.

Inventor： Myung-Suk Chun ,  In Kyu Song ,  Suk Woo Nam

IPC: C07C051/235 ,  B01J021/12 ,  B01J021/14 ,  B01J021/08

CPC classification number: C07C51/235 ,  B01J27/188 ,  B01J37/031 ,  B01J38/68 ,  C07C51/252 ,  Y02P20/584 ,  C07C57/04

Abstract: The present invention relates to a method for preparing a heteropolyacid catalyst and method for preparing methacrylic acid using thereof. More particularly, the present invention relates to a method for preparing heteropolyacid catalyst, which is produced by the recrystallization of a heteropolyacid and/or its salt dissolved in a basic organic solvent and heat-treatment, and further to a method for preparing metachrylic acid using thereof, wherein the use of the heteropolyacid catalyst increases the activity of oxidation reaction induced by the modified electronic properties of heteropolyanions and provides high efficiency production of methacrylic acid from methacrolein, since the basic property of solvent inhibits peculiar acidic property of heteropolyacid.

Abstract translation: 本发明涉及一种制备杂多酸催化剂的方法及其制备方法。 更具体地说，本发明涉及一种制备杂多酸催化剂的方法，该方法是通过将杂多酸和/或其盐溶解在碱性有机溶剂中进行重结晶并进行热处理制备的，进一步涉及一种使用 其中杂多酸催化剂的使用增加了由杂多阴离子改性的电子性质引起的氧化反应的活性，并由甲基丙烯醛高效生产甲基丙烯酸，因为溶剂的碱性可以抑制杂多酸的特殊酸性。

公开(公告)号：US20030024817A1

公开(公告)日：2003-02-06

申请号：US09906696

申请日：2001-07-18

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Myung-Suk Chun ,  Jae-Jin Kim ,  Sang Yup Lee

IPC: G01N027/26 ,  G01N001/18 ,  G01N031/22 ,  G01N031/16 ,  B32B027/04 ,  A61M001/36 ,  B32B005/18 ,  B32B005/02 ,  A61M001/14

CPC classification number: G01N27/60 ,  B01D61/12 ,  B01D61/22 ,  B01D65/08 ,  B01D65/10 ,  B01D2321/22 ,  Y10T436/25375

Abstract: The present invention relates to an apparatus for monitoring the progress of membrane fouling that occurs on pores as well as on the surface of a membrane by means of variations of zeta potential (null) of a hollow-fiber membrane according to time passage of filtration of a suspension, wherein colloid particles, biopolymers and other inorganic particles are dispersed, and the method thereof. Moreover, the present invention also relates to a method to identify the effect of concentration polarization layer and cake layer which can vary according to the axial position of a hollow-fiber and the developing progress of a membrane fouling by measuring the position-dependent zeta potential of the hollow-fiber membrane.

Abstract translation: 本发明涉及一种用于通过中空纤维膜的ζ电位（ζ）的变化来监测在孔和膜的表面上发生的膜污染进程的装置， 其中分散有胶体颗粒，生物聚合物和其它无机颗粒的悬浮液及其方法。 此外，本发明还涉及一种鉴定浓缩偏振层和滤饼层的效果的方法，其可以根据中空纤维的轴向位置而变化，并且通过测量位置依赖性ζ电位来测量膜污染的发展进展 的中空纤维膜。