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公开(公告)号：US20190210964A1
公开(公告)日：2019-07-11
申请号：US16358659
申请日：2019-03-19
Inventor： Xiaokang KOU , Risheng WANG , Gang WANG , Qiong LIU , Wanping REN , Julien BOUTET , Yuanbin YANG , Valentin GUIDAL
IPC: C07C319/28 , B01J20/285 , C07C323/58 , B01D15/12 , B01D15/26 , B01D15/42 , A61K31/145
Abstract: The present invention provides a process for purifying methionine. A methionine product having a purity of up to 99% or higher is obtained by separating methionine from a salt by-product through a process comprising adsorption and desorption using a macroporous adsorption resin, where the methionine content in the salt by-product is 0.03%. The yield of methionine extracted with the resin is up to 98% or higher. By using the process of the present invention, the existing production process is simplified, the quality of the methionine product is improved, and the production costs for methionine are reduced.
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公开(公告)号：US11918971B1
公开(公告)日：2024-03-05
申请号：US18236609
申请日：2023-08-22
Applicant: SUNRESIN NEW MATERIALS CO.LTD.
Inventor： Xiaokang Kou , Suidang Li , Pengwei Jiao , Qiong Liu
CPC classification number: B01J20/043 , B01J20/28004 , B01J20/28061 , B01J20/28064 , B01J20/28073 , B01J20/2808 , B01J20/28083 , B01J20/3028
Abstract: Disclosed in the present disclosure are a lithium adsorbent and a preparation method therefor. The lithium adsorbent has a porous structure, and includes an aluminum-based lithium adsorbent active material and a hydrophilic binder; and the lithium adsorbent has an average pore diameter ranging from 1 nm to 10 nm, a pore volume ranging from 0.65 ml/g to 0.8 ml/g, and a specific surface area ranging from 400 m2/g to 600 m2/g. The lithium adsorbent of the present disclosure has a specific average pore size ranging from 1 nm to 10 nm, lithium ions have a diameter of 0.3 nm, and the pore size of the lithium adsorbent of the present disclosure is three times or more greater than the diameter of the ions so that the lithium ions can quickly enter and exit pores. Therefore, the structure can ensure high adsorption efficiency and high desorption efficiency at a high flow rate, and allows desorption to be more concentrated than that of a general lithium adsorbent to reduce tailing, and can effectively improve the lithium production efficiency. Moreover, the product of the present disclosure has a pore size of less than 10 nm, allowing the lithium adsorbent to have a low dissolution loss rate and a long service life, and the lithium adsorbent of the present disclosure still has high adsorption efficiency and high desorption efficiency after 1000 cycles of adsorption and desorption.
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公开(公告)号：US20180194723A1
公开(公告)日：2018-07-12
申请号：US15740792
申请日：2016-06-28
Inventor： Xiaokang KOU , Risheng WANG , Gang WANG , Qiong LIU , Wanping REN , Julien BOUTET , Yuanbin YANG , Valentin GUIDAL
IPC: C07C319/28 , C07C323/58 , B01D15/42 , B01D15/12 , B01J20/285
CPC classification number: C07C319/28 , B01D15/12 , B01D15/426 , B01J20/285 , C07C323/58
Abstract: The present invention provides a process for purifying methionine. A methionine product having a purity of up to 99% or higher is obtained by separating methionine from a salt by-product through a process comprising adsorption and desorption using a macroporous adsorption resin, where the methionine content in the salt by-product is ≤0.03%. The yield of methionine extracted with the resin is up to 98% or higher. By using the process of the present invention, the existing production process is simplified, the quality of the methionine product is improved, and the production costs for methionine are reduced.
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