PROCESSING METHOD FOR WORKING SOLUTION

WIPO Patent Application WO/2020/105500

A1

The objective of the present invention is to provide a processing method for a working solution, wherein the amount of anthraquinones is increased by regenerating, into anthraquinones, by-products derived from anthraquinones and having no hydrogen peroxide generation ability, the by-products being contained in a repeatedly used working solution. According to the present invention, provided is a processing method for a working solution by mixing the working solution with an alkali metal compound, the working solution being continuously used in a method for producing hydrogen peroxide through an anthraquinone process including a hydrogenation step, an oxidation step, and an extraction step, wherein the method is characterized by using, as a working solution to be processed before the working solution is mixed with an alkali metal compound, a working solution which has a concentration of anthraquinones represented by general formula (1) or general formula (2), of less than 0.20 mol/L (in general formula (1) and general formula (2), R represents hydrogen or an alkyl group having 1-10 carbon atoms).

JPS57102237

METHOD OF SEPARATING METALLIC CATALYST AND USE OF MEMBRANE SEPARATOR

MATSUURA SHINICHIRO (JP)
YAMAMOTO TETSUYA (JP)
KUSHIDA YASUHIRO (JP)

PCT/JP2019/044210

May 28, 2020

November 12, 2019

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MITSUBISHI GAS CHEMICAL CO (JP)

C01B15/023; C07C46/02; C07C50/16; C07C50/18

WO2015025735A1	2015-02-26
WO2007129769A1	2007-11-15

JP2014224009A	2014-12-04
JPH09278419A	1997-10-28
JPH09278420A	1997-10-28

KOBAYASHI Hiroshi et al. (JP)

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