PURIFICATION DEVICE

WIPO Patent Application WO/2022/054840

A1

The present invention provides a method for obtaining high-quality products. The purification device according to the present invention is for purifying crystals. The purification device is configured to include: a hydraulic washing column provided with an extract port for a circulating slurry including crystals and a return port for an extracted circulating liquid including a molten liquid of crystals; a pipe for supplying a crystal-containing slurry to the hydraulic washing column; a filter for filtering the crystal-containing slurry in the hydraulic washing column; a pipe that is connected to the filter and that is for extracting a mother liquid; and equipment for melting crystals included in the circulating slurry extracted through the extract port. The distance from a lower end of the filter to an average height of the bottom surface in the hydraulic washing column is 1,000 mm or more.

JPH04297438	2-(4-HYDROXYPHENOXY)PROPIONIC ACID DICYCLOHEXYL AMINE SALT AND PRODUCTION THEREOF
JP2004509092	Industrial scale purification method for α-hydroxy acids
JPH0780809	[Title of Invention] Method for Treating Aqueous Methacrylic Acid

MUKAE MASASHI (JP)
TAKEMOTO YASUTAKA (JP)
WADA HIROKI (JP)

PCT/JP2021/033034

March 17, 2022

September 08, 2021

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NIPPON CATALYTIC CHEM IND (JP)

C07C51/43; B01D35/027; C07C51/47; C07C57/04; C07C57/05

WO2010032665A1

2010-03-25

JP2005509009A	2005-04-07
JP2013507427A	2013-03-04
JP2003530376A	2003-10-14
JP2008536893A	2008-09-11
JP2007182437A	2007-07-19
JP2013507427A	2013-03-04
JP2012518023A	2012-08-09
JP2008536893A	2008-09-11
JP2003530376A	2003-10-14
JP2005509009A	2005-04-07
EP1469926A1	2004-10-27
JP2005509010A	2005-04-07

YASUTOMI & ASSOCIATES (JP)

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