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    PRODUCTION METHOD FOR PURIFIED DICHLOROACETIC ACID
    1.
    发明申请
    PRODUCTION METHOD FOR PURIFIED DICHLOROACETIC ACID 有权

    公开(公告)号：US20250051256A1

    公开(公告)日：2025-02-13

    申请号：US18691479

    申请日：2022-09-27

    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED

    Inventor： Toshifumi KANO ,  Yuki TANAKA ,  Hayato KAWAI

    IPC: C07C51/44 ,  C07H1/00 ,  C07H21/02 ,  G01N30/02 ,  G01N30/06

    Abstract: The present invention provides a production method for purified dichloroacetic acid and an efficient production method for a nucleic acid molecule using the same. Specifically, the present invention provides a production method for purified dichloroacetic acid having a molar ratio of formaldehyde to dichloroacetic acid of 81×10−5 or less and a molar ratio of dichloroacetic anhydride to dichloroacetic acid of 20×10−5 or less, the method including: bringing dichloroacetic acid having both or one of formaldehyde content and dichloroacetic anhydride content exceeding the ratio(s), into contact with at least one compound having a boiling point lower than that of dichloroacetic acid selected from the group consisting of aliphatic alcohols, aliphatic amines, and water, and, in the coexistence of an aprotic inert solvent having a boiling point lower than that of dichloroacetic acid, distilling off a fraction containing the solvent from the resulting mixed liquid, and a production method for a nucleic acid molecule using the purified dichloroacetic acid as a deprotecting agent.

    PROCESS AND SYSTEM FOR THE RECOVERY OF GLYOXYLIC ACID
    4.
    发明公开
    PROCESS AND SYSTEM FOR THE RECOVERY OF GLYOXYLIC ACID 审中-公开

    公开(公告)号：US20240270673A1

    公开(公告)日：2024-08-15

    申请号：US18565395

    申请日：2022-06-09

    Applicant: Avantium Knowledge Centre B.V.

    Inventor： Julia Krasovic ,  Anna Louise JONGERIUS ,  Faezeh Esmaeili

    IPC: C07C51/44 ,  B01D3/10 ,  B01D9/00 ,  B01D61/02 ,  C07C51/43

    CPC classification number: C07C51/44 ,  B01D3/10 ,  B01D9/00 ,  B01D61/025 ,  C07C51/43 ,  B01D2009/0086

    Abstract: The present invention concerns a process for the recovery and purification of glyoxylic acid from a process stream comprising glyoxylic acid and oxalic acid, wherein the process stream comprising glyoxylic acid and oxalic acid is subjected to a number of alternating separation and dehydration steps. The process comprising the steps of: (i) providing an aqueous solution comprising glyoxylic acid and oxalic acid; (ii) precipitating at least a portion of the oxalic acid using low-temperature crystallization at a temperature of at most 18° C.; (iii) separating the precipitated oxalic acid from the solution to obtain a solution depleted in oxalic acid; (iv) concentrating the solution depleted in oxalic obtained in step (iii) using reverse osmosis; and repeating steps (ii)-(iv) with the concentrated solution obtained in step (iv) until a purified glyoxylic acid stream with a predetermined degree of purity is obtained. The invention also relates to a system for carrying out the process.

    Process for producing acetic acid
    5.
    再颁专利
    Process for producing acetic acid 有权

    公开(公告)号：USRE50062E1

    公开(公告)日：2024-07-30

    申请号：US16712371

    申请日：2019-12-12

    Applicant: DAICEL CORPORATION

    Inventor： Masahiko Shimizu ,  Ryuji Saito ,  Hiroyuki Miura ,  Takashi Ueno ,  Hidehiko Nakajima

    IPC: C07C51/12 ,  B01J23/46 ,  B01J27/13 ,  C07C51/44

    CPC classification number: C07C51/12 ,  B01J23/464 ,  B01J27/13 ,  C07C51/44 ,  C07C51/12 ,  C07C53/08 ,  C07C51/44 ,  C07C53/08

    Abstract: A process for producing acetic acid by: a reaction step for continuously allowing methanol to react with carbon monoxide in the presence of a catalyst system comprising a metal catalyst, an ionic iodide, and methyl iodide in a carbonylation reactor, a flash distillation step for continuously feeding a flasher with a reaction mixture from the reactor and evaporating a volatile component at least containing product acetic acid, methyl acetate, and methyl iodide by flash distillation to separate the volatile component and a liquid catalyst mixture at least containing the metal catalyst and the ionic iodide, and an acetic acid collection step for separating a stream containing acetic acid from the volatile component to collect acetic acid; wherein, in the flash distillation step, the flash distillation is conducted under the condition that the concentration of methyl acetate in the liquid catalyst mixture is not less than 0.6% by weight.

    Method for producing acetic acid
    6.
    发明授权
    Method for producing acetic acid 有权

    公开(公告)号：US11884617B2

    公开(公告)日：2024-01-30

    申请号：US16482464

    申请日：2018-07-02

    Applicant: DAICEL CORPORATION

    Inventor： Masahiko Shimizu

    IPC: C07C51/12 ,  B01J19/18 ,  B01J31/20 ,  C07C51/44

    CPC classification number: C07C51/12 ,  B01J19/1856 ,  B01J31/20 ,  C07C51/44 ,  B01J2219/00038 ,  B01J2531/822 ,  B01J2531/827

    Abstract: Provided is an acetic acid production method that enables smooth reduction and/or increase of acetic acid production with easy operation and can industrially efficiently, stably produce acetic acid with maintained quality even when the acetic acid production volume is changed. The acetic acid production method includes a carbonylation step in which methanol is reacted with carbon monoxide in a continuous system in the presence of a catalytic system, acetic acid, methyl acetate, and water, where the catalytic system includes a metal catalyst and methyl iodide. The carbonylation step employs two or more reactors disposed in parallel.

    Processes and Apparatuses for Distillation of an Acetic Acid and Propionic Acid-Containing Stream in an Acetic Acid Production Unit
    7.
    发明公开
    Processes and Apparatuses for Distillation of an Acetic Acid and Propionic Acid-Containing Stream in an Acetic Acid Production Unit 审中-公开

    公开(公告)号：US20230415065A1

    公开(公告)日：2023-12-28

    申请号：US18030555

    申请日：2021-09-30

    Applicant: Ineos Acetyls UK Limited

    Inventor： James William Brace

    IPC: B01D3/32 ,  C07C51/44

    CPC classification number: B01D3/32 ,  C07C51/44

    Abstract: The present disclosure relates generally to processes and systems for distillation of acetic acid products. In one aspect, the disclosure provides a process for separating a feed stream comprising acetic acid and propionic acid in a distillation column. The process includes introducing a feed stream into the column through a feed inlet; withdrawing a first product stream comprising acetic acid and propionic acid from a first draw outlet disposed at a level above the level of the feed inlet; and withdrawing a second product stream comprising acetic acid and propionic acid from a second draw outlet disposed at a level between the level of the feed inlet and the level of the first draw outlet. The volume ratio of the first product stream to the second product stream is in the range of 1:9 to 19:1; and the amount of propionic acid present in the second product stream is at least 50 ppmw greater than the amount of propionic acid present in the first product stream.

    METHOD FOR PRODUCING EASILY POLYMERIZABLE COMPOUND
    10.
    发明公开
    METHOD FOR PRODUCING EASILY POLYMERIZABLE COMPOUND 审中-公开

    公开(公告)号：US20230202960A1

    公开(公告)日：2023-06-29

    申请号：US17928506

    申请日：2021-05-31

    Applicant: NIPPON SHOKUBAI CO., LTD.

    Inventor： Yuki KASE ,  Takashi SUGIMOTO

    IPC: C07C51/44

    CPC classification number: C07C51/44

    Abstract: A method for producing an easily polymerizable compound, comprising a polymerization prevention step of supplying an oxygen-containing gas to an easily polymerizable compound-containing liquid through a gas supply means having one or more supply ports, wherein an area S (mm2) per one supply port is 0.1 or more and 20 or less, and a ratio V/S of a linear velocity V (m/s) of the gas at the supply port to the area S in the polymerization preventing step is 6.0 or more.

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