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Adsorption agent for removing iodide from organic medium and preparation and application

An adsorbent, iodide technology, applied in organic chemistry, organic cation exchangers, separation/purification of carboxylic acid compounds, etc., can solve the problems of non-sensitivity, troublesome and difficult removal of iodide, and achieve optimal iodine removal. effect of effect

Active Publication Date: 2008-07-02
JIANGSU SOPO CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These iodides, especially iodide ions, are difficult to remove in the subsequent separation process, which introduces troubles to the production process using acetic acid as a raw material. The more prominent problem is the production process of vinyl acetate by acetic acid and ethylene. In , the catalyst used is sensitive to iodide non-production

Method used

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preparation example Construction

[0035] The method for preparing above-mentioned adsorbent provided by the present invention is as follows:

[0036] Initiated by azobisisoheptanonitrile, cross-linked polymer beads are obtained by suspension copolymerization of acrylonitrile and divinylbenzene, and the pore-forming agent is washed away by solvent extraction, and then obtained by sulfonation and metal ion exchange . The dosage ratio of divinylbenzene and acrylonitrile is 1-10, the optimal dosage ratio is 7-9, and the pore-forming agents used are kerosene, toluene, gasoline, fatty alcohol, alkanes and the like. The organic medium treated by the adsorbent is mainly organic acid, especially acetic acid. The adsorbent is used for removing organic iodide and iodide ions in organic media, especially for removing iodide ions therein. The upper limit temperature of the adsorbent is 90°C, and it can be used in the reactor method or the ion exchange column method, wherein the liquid hourly space velocity is 1-15hr when...

Embodiment 1

[0040]The synthesis of polymer beads adopts the suspension polymerization method. The reaction raw materials are 54 g of divinylbenzene, 6 g of acrylonitrile, and the pore formers used are 25 g of kerosene, 25 g of toluene, and 15 g of isoamyl alcohol. The initiator was 1.3 g of azobisisoheptanonitrile. The dispersant is 24g of Jiutai soil and 1.2g of polycondensate of tetraethylenepentamine-epichlorohydrin.

[0041] Acrylonitrile was distilled under reduced pressure to remove the polymerization inhibitor therein, and divinylbenzene was washed with distilled water 3 times to remove the water-soluble polymerization inhibitor therein. Make Jiutai soil into a paste with distilled water. Add about 480ml of 10% Na to a 1000ml flask 2 SO 4 Aqueous solution, the temperature of the water bath is controlled at about 40°C, add the above-mentioned treated polymer monomer, pore-forming agent and initiator into the flask, start the mechanical stirring and control the stirring speed at ...

Embodiment 2

[0044] The adsorbent 10ml that embodiment 1 makes is packed in the acidic burette that internal diameter is 8mm, at 35 ℃, the acetic acid that contains iodide ion 25ppb is passed through adsorption column, and the control liquid hourly space velocity is 2hr -1 , The iodide ion content in the post-column acetic acid was measured to be 0.018ppb.

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Abstract

The invention provides a sorbent used for removing iodide in organic medium, in particular to macroporous crosslinking ion exchange resin loaded with one or a plurality of metal ions. The metal ions loaded is one of silver, Hg and Pd, and mol loading of the metal ions is 1-90 percent of active sites of the ion exchange resin; the macroporous crosslinking ion exchange resin comprises two functional groups containing sulfonic group and carboxyl. A preparation method of the invention is that: through the initiation of azo-bis-iso-heptonitrile, acrylonitrile is suspension copolymerized with divinylbenzene monomer to obtain corsslinking polymer beads, pore-forming agent of which is extracted and washed out by solvent, thus obtaining the invention through sulfonation and ion exchange loading metal ions; the mol loading of the metal ions is 1-90 percent of the active sites of the ion exchange resin. Ceiling temperature used by the sorbent is 90 DEG C, liquid hourly space velocity is 1-15hr<-1> when ion-exchange column is used for removing iondine. The sorbent can remove the iondine ions in acetic acid below 5ppb.

Description

technical field [0001] The invention relates to an adsorbent for removing iodide in organic media. [0002] The present invention also relates to a method for preparing the above-mentioned adsorbent. [0003] The invention also relates to the use of the above-mentioned adsorbents. Background technique [0004] The presence of iodide in organic media can cause some problems during its use, especially during catalytic reactions where the presence of iodine can poison some noble metal catalysts. As we all know, the mainstream process for producing acetic acid is methanol carbonylation catalyzed by Mengsanto rhodium series catalyst, in which methyl iodide is a necessary co-catalyst. On the basis of this, Celanese further increased the production capacity and suppressed the water-gas reaction by adding a high content of lithium iodide to the catalytic system, reducing the loss of raw materials. The presence of methyl iodide and lithium iodide in the reaction system makes the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/04C07C51/47C07C53/08B01J39/19
Inventor 邵守言凌晨曹宏兵王忠华袁国卿钱庆利闫芳
Owner JIANGSU SOPO CHEM
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