Dialkyl carbonate production method

    公开(公告)号:US12129230B2

    公开(公告)日:2024-10-29

    申请号:US17297610

    申请日:2019-12-04

    IPC分类号: C07C68/04 B01J23/10

    CPC分类号: C07C68/04 B01J23/10

    摘要: Provided is a dialkyl carbonate production method that enables a dialkyl carbonate to be produced in a simple manner and in a short reaction time and enables easy processing of by-products. This dialkyl carbonate production method involves generation reaction of a carbonate ester through reaction between carbon dioxide and an alcohol represented by formula (1), wherein the generation reaction of a carbonate ester is performed in the presence of a carbodiimide compound represented by formula (2) (R1-R3 in the formula are as described in the description of the present application).

    [Chemical formula 1]

    R1—OH  (1)

    [Chemical formula 2]

    R2—N═C═N—R3  (2)

    Air-permeable member with removable protective film for covering ventilation hole

    公开(公告)号:US12120832B2

    公开(公告)日:2024-10-15

    申请号:US17442242

    申请日:2020-03-18

    发明人: Hiroki Kigami

    摘要: A member of the present invention is to be placed to cover a ventilation hole in order to allow passage of gas between an outside and an inside of a housing through the ventilation hole of the housing and prevent dust and/or a liquid from entering the inside from the outside through the ventilation hole. The member of the present invention includes a porous membrane having air permeability in a thickness direction and a provisional protective film joined to the porous membrane to cover the porous membrane from the outside side. The provisional protective film is air-impermeable in a thickness direction or has lower air permeability in the thickness direction than the air permeability of the porous membrane. The provisional protective film and the porous membrane are joined to each other in such a manner that the provisional protective film is removable from the porous membrane.