公开(公告)号：US20250025867A1

公开(公告)日：2025-01-23

申请号：US18717454

申请日：2022-12-21

Applicant: Arkema France

Inventor： Jean-Marc SAGE ,  Benoît REQUIEME ,  Laurence FARINA

IPC: B01J38/66 ,  B01J38/02 ,  B01J38/52 ,  B01J38/56

Abstract: The present invention relates to a method for reactivating an anthraquinone hydrogenation catalyst for the preparation of hydrogen peroxide, comprising at least one step of bringing said catalyst into contact with an aqueous solution comprising ammonia. The invention also relates to the use of an aqueous ammonia solution for reactivating an anthraquinone hydrogenation catalyst for the preparation of hydrogen peroxide.

公开(公告)号：US20250051164A1

公开(公告)日：2025-02-13

申请号：US18723301

申请日：2022-12-20

Applicant: ARKEMA FRANCE

Inventor： Jean-Marc SAGE ,  Emmanuel ACHARD

IPC: C01B21/16 ,  B01D3/34

Abstract: The invention relates to a process for preparing hydrazine hydrate, comprising a step of hydrolyzing an azine in a distillation column in the presence of at least one silicone of the polydialkylsiloxane, polydiarylsiloxane or polyalkyl-arylsiloxane formula.
The invention also relates to the use of at least one silicone of the polydialkylsiloxane formula as an anti-foaming agent in a process for preparing azine hydrate.

公开(公告)号：US20240253988A1

公开(公告)日：2024-08-01

申请号：US18564355

申请日：2022-12-21

Applicant: ARKEMA FRANCE

Inventor： Abdelatif BABA-AHMED ,  David ANDRE ,  Jean-Michel BOSSOUTROT ,  Jean-Marc SAGE ,  Laurent WENDLINGER

IPC: C01B15/023

CPC classification number: C01B15/023

Abstract: The present invention relates to a process for the production of hydrogen peroxide by the cyclic Auto-Oxydation-process comprising the two alternate steps of: hydrogenation of a working solution in the presence of a catalyst, wherein said working solution contains at least one quinone dissolved in at least one organic solvent, to obtain at least one corresponding hydroquinone; and oxidation of said at least one hydroquinone; characterized in that the organic solvent has the formula (I):




wherein R1 is an aryl group comprising from 6 to 18 carbon atoms and R2 is an alkyl group comprising from 1 to 8 carbon atoms, when R2 is a methyl group, R1 is different from phenyl.