公开(公告)号：US11306181B2

公开(公告)日：2022-04-19

申请号：US16779364

申请日：2020-01-31

Applicant: DSM IP ASSETS B.V.

Inventor： Bas Van Laarhoven ,  Eric Grolman ,  Michiel Muyris

IPC: C08G69/26 ,  C08G69/30 ,  C08G69/28 ,  C08J3/12

Abstract: The present invention relates to a process for preparing a granular nylon salt material, wherein an aqueous mixture, comprising at least 65 wt. % of salt components, and at most 35 wt. % of an aqueous medium, the weight percentages (wt. %) being relative to the total weight of the aqueous mixture, is flashed from a pressure vessel via a flash valve into a flash chamber, thereby evaporating the aqueous medium in an amount sufficient to result in a residual moisture content of at most 7.5 wt. %, and forming a granular nylon salt material. The invention also relates to a process for preparing a nylon polymer, comprising direct solid state polymerization of the granular salt material prepared by flash granulation.

公开(公告)号：US10590238B2

公开(公告)日：2020-03-17

申请号：US15329404

申请日：2015-07-24

Applicant: DSM IP ASSETS B.V.

Inventor： Bas Van Laarhoven ,  Eric Grolman ,  Michiel Muyris

IPC: C08G69/26 ,  C08G69/30 ,  C08G69/28 ,  C08J3/12

Abstract: The present invention relates to a process for preparing a granular nylon salt material, wherein an aqueous mixture, comprising at least 65 wt. % of salt components, and at most 35 wt. % of an aqueous medium, the weight percentages (wt. %) being relative to the total weight of the aqueous mixture, is flashed from a pressure vessel via a flash valve into a flash chamber, thereby evaporating the aqueous medium in an amount sufficient to result in a residual moisture content of at most 7.5 wt. %, and forming a granular nylon salt material. The invention also relates to a process for preparing a nylon polymer, comprising direct solid state polymerization of the granular salt material prepared by flash granulation.