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Method of preparing ammonium metatungstate solution based on bipolar membrane electrodialysis

A technology of bipolar membrane electrodialysis and ammonium metatungstate, applied in the direction of electrodialysis, preparation of tungsten compounds, chemical instruments and methods, etc., can solve problems such as low direct yield and insufficient product purity, and achieve low and high tungsten High yield, guaranteed high efficiency, and low equipment investment

Inactive Publication Date: 2017-08-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve a series of problems and deficiencies in the existing ammonium metatungstate preparation methods, such as insufficient product purity, low direct yield, and large consumption of inorganic acids, the present invention provides a method that uses ammonium metatungstate solution as raw material and adopts double A method for preparing ammonium metatungstate solution by electrode membrane electrodialysis technology; it aims to realize the acid adjustment mode without adding acid in the preparation process, obtain high-quality ammonium metatungstate solution, and then overcome the shortcomings of traditional processes and provide a low-investment Discontinuous or continuous production method of ammonium metatungstate solution with low energy consumption and high direct yield of tungsten

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  • Method of preparing ammonium metatungstate solution based on bipolar membrane electrodialysis

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Effect test

Embodiment 1

[0063] Using a basic structure such as figure 2 In the electrodialysis system shown, the membrane stack of the electrodialyzer includes 20 two-chamber units, and the effective area of ​​a single membrane is 0.02m 2 , the bipolar membrane is NEOSEPTA BP-1, the cation exchange membrane is NEOSEPTA CMB, the anode and cathode are both titanium-plated nickel-plated electrodes, and the membrane stack structure is as follows figure 1 shown. Ammonium tungstate solution containing WO 3 250g / L. The solution initially filled into the circulation tank of the acidification chamber is ammonium metatungstate solution, where WO 3 300.0g / L, pH value around 3.0, volume 6.0L. The solution initially filled into the circulation tank of the alkali chamber is NH 4 HCO 3 solution with a concentration of 1.0 mol / L and a volume of 5 L. The solution continuously added to the alkali chamber is 1.0mol / L NH 4 HCO 3 solution. The solution initially filled into the circulation tank of the electr...

Embodiment 2

[0065] Using a basic structure such as figure 2 The electrodialysis system shown, wherein the membrane stack of the electrodialyzer is the same as that of embodiment 1. Ammonium tungstate solution containing WO 3 151.2g / L,. The solution initially filled into the circulation tank of the acidification chamber is obtained by diluting the ammonium metatungstate solution prepared in Example 1 with deionized water, wherein WO 3 150.0g / L, pH value around 2.0, volume 6.0L.

[0066] The solution initially filled into the circulation tank of the alkali chamber is (NH 4 ) 2 CO 3 solution with a concentration of 0.1mol / L and a volume of 5L. The solution that is going to be continuously added to the alkali chamber is also a concentration of 0.1mol / L (NH 4 ) 2 CO 3 solution. The solution initially filled into the circulation tank of the electrode chamber is NH 4 OH solution with a concentration of 1.0mol / L and a volume of 5L. After the power-on operation starts, the ammonium ...

Embodiment 3

[0068] The equipment used is the same as that of Example 1, except that the cathode and anode are platinum-plated titanium plate electrodes. Ammonium tungstate solution containing WO 3 100.0g / L. The solution initially filled into the circulation tank of the acidification chamber is obtained by diluting the ammonium metatungstate solution prepared in Example 2 with deionized water, wherein WO 3 50.0g / L, pH value around 4.0, volume 6.0L. The solution initially filled into the circulation tank of the alkali chamber is NH 4 NO 3 solution with a concentration of 0.5mol / L and a volume of 5L. The solution to be continuously added to the alkali chamber is NH with a concentration of 0.5mol / L 4 NO 3 solution. The solution initially filled into the circulation tank of the electrode chamber is NH 4 NO 3 solution with a concentration of 1.0 mol / L and a volume of 5 L. After the electrodialysis operation starts, the ammonium tungstate solution is continuously added to the inlet p...

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Abstract

The invention discloses a method of preparing an ammonium metatungstate solution based on bipolar membrane electrodialysis. According to the method, the removal of part of ammonium ions in an ammonium tungstate solution serving as a raw material and the reduction of a pH value are realized by adopting a bipolar membrane electrodialysis system with a two-room bipolar membrane electrodialysis membrane stack through bipolar membrane electrodialysis under the action of direct current electric field force; and the ammonium metatungstate solution is obtained in an acidification room of the bipolar membrane electrodialysis system. The method has the beneficial effects that inorganic acids are not consumed; impurity anions are not introduced; and the method has the advantages of short process, high direct recovery rate, low power consumption, environmental protection and easy realization of industrialization.

Description

technical field [0001] The invention relates to a method for preparing ammonium metatungstate solution, in particular to a method for preparing ammonium metatungstate solution by using bipolar membrane electrodialysis technology with ammonium tungstate solution as raw material. Background technique [0002] Ammonium metatungstate (AMT), a tungsten isopolyate, has the molecular formula [(NH 4 ) 6 (H 2 W 12 o 40 )]·nH 2 O. Ammonium metatungstate is an important tungsten chemical product and an important raw material for preparing tungsten-based hydrogenation catalysts in petrochemical industry. There are many methods for preparing AMT, which can be roughly divided into two types: solid-phase conversion method and liquid-phase conversion method according to different methods for preparing AMT solution. Ammonium paratungstate (APT, (NH 4 ) 10 h 2 W 12 o 42 ·nH 2 (2) The thermal dissociation method is a typical solid-phase conversion method, and is the mainstream met...

Claims

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Application Information

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IPC IPC(8): C01G41/00B01D61/42
CPCC01G41/003B01D61/422
Inventor 张贵清关文娟尚广浩姚琨李青刚曾理曹佐英肖连生
Owner CENT SOUTH UNIV
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