公开(公告)号：US12091480B2

公开(公告)日：2024-09-17

申请号：US17041746

申请日：2018-04-12

Applicant: SNF GROUP

Inventor： Cédrick Favero ,  Johann Kieffer ,  Jing Ling

IPC: C08F220/34 ,  C07C213/08 ,  C07C213/10 ,  C07C219/08

CPC classification number: C08F220/34 ,  C07C213/08 ,  C07C213/10 ,  C07C219/08

Abstract: Process for the production of 2-dimethylaminoethyl (meth)acrylate in multiple stage batch reactions involving the recycling of the catalyst (DBTO) in subsequent reaction, the addition a certain amount of fresh catalyst to the recycled catalyst, the use of said catalysts in the subsequent reaction, and wherein the volume decrease due to azeotropic distillation is compensate in order to keep the volume constant in the reactor during the reaction by the continuous addition of a composition comprising methyl(meth)acrylate and dimethylaminoethanol.

公开(公告)号：US11767381B2

公开(公告)日：2023-09-26

申请号：US17934378

申请日：2022-09-22

Applicant: SNF Group

Inventor： Cédrick Favero ,  Johann Kieffer ,  Benoît Legras ,  Nicolas Boisse ,  Jing Ling

IPC: C08F120/34 ,  C08K5/1545

CPC classification number: C08F120/34 ,  C08K5/1545

Abstract: The present invention relates to a water-soluble polymer obtained by polymerization of at least a 2-dimethylaminoethyl acrylate monomer and/or its salts, in presence of at least a tocopherol and/or its derivatives, or a tocotrienol and/or its derivatives, and its uses.

公开(公告)号：US11802109B2

公开(公告)日：2023-10-31

申请号：US17447754

申请日：2021-09-15

Applicant: SNF GROUP

Inventor： Cédrick Favero ,  Johann Kieffer ,  Benoît Legras ,  Raphaël Doudin

IPC: C07C303/44 ,  C08F20/58 ,  C02F1/56 ,  C02F1/54 ,  C02F1/52

CPC classification number: C07C303/44 ,  C02F1/5272 ,  C02F1/56 ,  C08F20/58

Abstract: The invention relates to a method for the purification of acrylamido-2-methyl-2-propanesulphonic acid comprising the following successive steps:



1) preparation of a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals by distillation of an aqueous solution of acrylamido-2-methyl-2-propanesulphonic acid in order to obtain a suspension of acrylamido-2-methyl-2-propanesulphonic acid crystals,
2) isolation of the acrylamido-2-methyl-2-propanesulphonic acid crystals generally by solid/liquid separation from said suspension in order to isolate said acrylamido-2-methyl-2-propanesulphonic acid crystals,


characterised in that the distillation step is carried out continuously and at a pressure below atmospheric pressure.


The invention also relates to a polymer obtained from acrylamido-2-methyl-2-propanesulphonic acid crystals or its salts, obtained according to such a method, and to the use of said polymer in oil and gas recovery, in water treatment, in sludge treatment, in manufacturing paper, in construction, in mining, in cosmetic formulation, in detergent formulation, in textile making, or in agriculture.

公开(公告)号：US12269789B2

公开(公告)日：2025-04-08

申请号：US18566281

申请日：2022-07-08

Applicant: SNF Group

Inventor： Cédrick Favero ,  Johann Kieffer

IPC: C07C233/03 ,  C07C231/12 ,  C08F226/02 ,  D21H17/34 ,  D21H23/04

Abstract: A method for obtaining N-vinylformamide including the reaction between an acetaldehyde and a formamide, one of the two, preferably both, being at least partially renewable and non-fossil. A bio-sourced N-vinylformamide monomer, a bio-sourced polymer obtained by polymerization including at least N-vinylformamide monomer, and the use of the polymer in various technical fields.

公开(公告)号：US12030832B2

公开(公告)日：2024-07-09

申请号：US17198573

申请日：2021-03-11

Applicant: SNF GROUP

Inventor： Cédrick Favero ,  Johann Kieffer ,  Nicolas Boisse ,  Bruno Michel ,  Jing Ling

IPC: C07C213/06 ,  B01J19/28 ,  B01J31/22 ,  B01J35/23 ,  B01J35/30 ,  B01J37/00 ,  C07C219/08 ,  C08F20/34 ,  C07C19/08

CPC classification number: C07C213/06 ,  B01J19/28 ,  B01J31/2213 ,  B01J35/23 ,  B01J35/393 ,  B01J37/0036 ,  C07C219/08 ,  C08F20/34 ,  B01J2219/1946 ,  B01J2231/49 ,  B01J2531/42

Abstract: The invention relates to a new dialkyl tin oxide catalyst composition and its use for the synthesis of amino alkyl (meth)acrylates by transesterification from an alkyl (meth)acrylates and an amino alcohol, and especially 2-dimethylaminoethyl (meth)acrylate.
The invention also relates to polymers made with quaternized amino alkyl (meth)acrylates and use of said polymers in water treatment, sludge dewatering, papermaking process, agriculture, cosmetic and detergency composition, textile process, oil and gas recovery process such as enhanced oil recovery, fracturing, mining operation such as tailings treatment.