Asahi Kasei Kabushiki Kaisha

Asahi Kasei Kogyo Kabushiki Kaisha

Fumihiko Yamaguchi

Fumio Matsushita

Shinya Hamasaki

Hitoshi Mizomoto

Norikazu Fujimoto

Takena Mochizuki

Kyouhei Hattori

Tsutomu Idehara

The present invention provides a carbon dioxide absorber capable of efficiently and stably removing carbon dioxide in a gas or solution. This carbon dioxide absorber contains an amine compound, a weakly acidic compound and water, the pKb value of the amine compound in an aqueous solution at 30&#xb0; C. is 4.0 to 7.0, the pKa value of the weakly acidic compound in an aqueous solution at 30&#xb0; C. is 7.0 to 10.0, and the weakly acidic compound is present in an amount within the range of 0.01 equivalents to 1.50 equivalents with respect to amino groups of the amine compound.

Carbon dioxide absorber and carbon dioxide separation/recovery method using the absorber

A method of accurately separating immunoglobulin monomers by subjecting an immunoglobulin solution containing at least immunoglobulin monomers and immunoglobulin aggregates to cross-flow filtration using an ultrafiltration membrane, an ultrafiltration membrane module, and a cross-flow filtration apparatus. The method can separate immunoglobulin monomers by subjecting an immunoglobulin solution containing at least immunoglobulin monomers and immunoglobulin aggregates and having an immunoglobulin concentration of 1 to 150 g/L to cross-flow filtration using an ultrafiltration membrane having a molecular weight cut-off of 100,000 or more and less than 500,000 so that immunoglobulin monomers passes through the ultrafiltration membrane with a permeability of 80% or more while achieving a fractionation performance in which the permeability ratio of immunoglobulin dimers to immunoglobulin monomers that pass through the ultrafiltration membrane is 0.20 or less.

Method for separation of immunoglobulin monomers

High density ethylene polymer and method for producing the same

Growing community of inventors

Tokyo, Japan

Fumihiko Yamaguchi