公开(公告)号：WO2021198557A1

公开(公告)日：2021-10-07

申请号：PCT/FI2021/050218

申请日：2021-03-29

Applicant: CHEMPOLIS OY

Inventor： ROUHIAINEN, Maija ,  PELTOLA, Sirpa ,  ROUSU, Päivi

IPC: D21C9/10 ,  D21C9/001 ,  D21C9/1042 ,  D21C9/1052 ,  D21C9/163 ,  D21H21/00

Abstract: A method of controlling viscosity in peroxide bleaching of a cellulose pulp, comprising treating the cellulose pulp with disodium 3,3'-((2-ethylhexyl)azanediyl)dipropionate as a chelating agent to chelate metals present in the pulp; peroxide bleaching the cellulose pulp in at least one stage at a pH of about 9.5 to about 13.

公开(公告)号：WO2022269233A1

公开(公告)日：2022-12-29

申请号：PCT/GB2022/051481

申请日：2022-06-13

Applicant: INNOSPEC LIMITED

Inventor： GILES, Matthew Robert

IPC: C11D3/33 ,  C07C229/24 ,  C11D3/20 ,  C11D3/22 ,  C11D3/37 ,  C11D11/00 ,  C02F5/12 ,  D21C9/10 ,  C02F5/10 ,  C07C211/10 ,  C07C237/12 ,  C11D11/0082 ,  C11D3/2082 ,  C11D3/2086 ,  C11D3/225 ,  C11D3/3719 ,  D21C9/1042

Abstract: An adduct of ethylenediamine disuccinic acid or a salt thereof and a further polycarboxylic acid or a salt thereof wherein the further polycarboxylic acid is selected from citric acid, polyaspartic acid, tartaric acid, malonic acid, maleic acid, carboxymethyl inulin, oxalic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid and fumaric acid; and wherein said adduct is in the form of a free flowing particulate solid; wherein EDDS is present in the adduct in a molar excess compared with the further polycarboxylic acid.