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公开(公告)号：US20230295064A1
公开(公告)日：2023-09-21
申请号：US18040551
申请日：2021-07-30
Inventor： Yi Yuan
IPC: C07C29/76
CPC classification number: C07C29/76
Abstract: A method for refining a bio-based crude ethylene glycol, the method comprising: using a bio-based crude ethylene glycol as a raw material, diluting same with water to an ethylene glycol concentration of 1-95 weight %; under the conditions of the temperature being 0-100° C. and the volume space velocity being 0.01-20 BV/hr, continuously passing the diluted ethylene glycol aqueous solution through an adsorption bed, which is filled with one or more macroporous adsorption resins and an optional ion exchange resin, for an adsorption treatment so as to obtain a purified ethylene glycol aqueous solution; and then dehydrating same to obtain ethylene glycol.
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公开(公告)号：US11578024B2
公开(公告)日：2023-02-14
申请号：US17280595
申请日：2019-09-19
Inventor： Yi Yuan
Abstract: The invention provides a process for refining bio-based propylene glycol, wherein impurities having boiling points close to that of propylene glycol are separated. In this process, C5-C20 oleophilic alcohol compounds, C5-C20 alkanes and/or C4-C20 oleophilic ketone compounds are subjected to azeotropism as an azeotropic solvent together with the bio-based propylene glycol to obtain an azeotrope containing propylene glycol. Then the azeotropic solvent in the azeotrope is separated to obtain a crude propylene glycol which is further purified to obtain propylene glycol.
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Patent Agency Ranking
公开(公告)号：US20210340087A1
公开(公告)日：2021-11-04
申请号：US17274033
申请日：2019-09-03
Inventor： Yi Yuan
IPC: C07C29/82 , C07D307/12
Abstract: The invention provides a process for refining non-petroleum based ethylene glycol, wherein impurities having a boiling point close to that of ethylene glycol are separated. In the process, C5-C20 oleophilic alcohol compounds, C5-C20 alkanes and/or C4-C20 oleophilic ketone compounds are subjected to azeotropism as an azeotropic agent together with the non-petroleum based ethylene glycol to obtain an azeotrope containing ethylene glycol. Then the azeotropic agent in the azeotrope is separated and removed to obtain an ethylene glycol crude product which is further purified to obtain ethylene glycol.
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公开(公告)号：US20230150904A1
公开(公告)日：2023-05-18
申请号：US18155597
申请日：2023-01-17
Inventor： Yi Yuan
Abstract: The invention provides a process for refining bio-based propylene glycol, wherein impurities having boiling points close to that of propylene glycol are separated. In this process, C5-C20 oleophilic alcohol compounds, C5-C20 alkanes and/or C4-C20 oleophilic ketone compounds are subjected to azeotropism as an azeotropic solvent together with the bio-based propylene glycol to obtain an azeotrope containing propylene glycol. Then the azeotropic solvent in the azeotrope is separated to obtain a crude propylene glycol which is further purified to obtain propylene glycol.
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公开(公告)号：US11352463B2
公开(公告)日：2022-06-07
申请号：US16348408
申请日：2017-11-09
Inventor： Haiyu Ren , Marlon Salvador Morales , Yi Yuan , Jing Liu , Hongbin Qi
Abstract: Disclosed are bio-based mono-ethylene glycol (MEG) compositions containing from about 1 ppm to about 5000 ppm of at least one C3-C12 1,2-diol, bio-based polyester compositions made therefrom, and methods of making the same are disclosed. Preforms and blow-molded polyester containers prepared from the bio-based MEG and polyester are described.
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公开(公告)号：US20210371363A1
公开(公告)日：2021-12-02
申请号：US17280595
申请日：2019-09-19
Inventor： Yi Yuan
Abstract: The invention provides a process for refining bio-based propylene glycol, wherein impurities having boiling points close to that of propylene glycol are separated. In this process, C5-C20 oleophilic alcohol compounds, C5-C20 alkanes and/or C4-C20 oleophilic ketone compounds are subjected to azeotropism as an azeotropic solvent together with the bio-based propylene glycol to obtain an azeotrope containing propylene glycol. Then the azeotropic solvent in the azeotrope is separated to obtain a crude propylene glycol which is further purified to obtain propylene glycol.
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公开(公告)号：US20190112248A1
公开(公告)日：2019-04-18
申请号：US16090345
申请日：2017-03-30
IPC: C07C29/90 , C07C29/80 , B01J23/888 , B01J23/887
Abstract: The present invention provides a method for increasing the UV transmittance of ethylene glycol. The method uses an ethylene glycol solution and hydrogen as raw materials, and uses an alloy catalyst comprising nickel, one or more rare-earth elements, tin, and aluminum, the contents thereof in parts by weight being 10-90, 1-5, 1-60, and 5-9, respectively. The method of the present invention uses an inexpensive, stable-in-aqueous-phase, carrier-free alloy as a catalyst, and continuously adds hydrogen to reduce unsaturated impurities in ethylene glycol. In application of the method of the present invention in continuous industrial-scale production, the use of this type of alloy catalyst could be especially significant for the achievement of long-term system stability and control of production costs.
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