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Processing method of mixed solution

A mixed solution and treatment method technology, which is applied in the field of mixed solution treatment, can solve the problem of products being used as fuel, and achieve excellent reuse effects

Active Publication Date: 2017-05-17
SANWA YUKA INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as described above, the processing method of a mixed solution containing a fluorine-containing electrolyte and carbonates using a calcium compound involves the problem that it is difficult to use the resulting product as a fuel. As a processing method for the mixed solution, it is now desired to establish a Safe and economical methods other than incineration

Method used

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  • Processing method of mixed solution
  • Processing method of mixed solution
  • Processing method of mixed solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Prepare ethylene carbonate and dimethyl carbonate as solvents and contain lithium hexafluorophosphate (LiPF 6 ) 10% by weight (equivalent to 0.26 mol in terms of lithium hexafluorophosphate, equivalent to 7.5% by weight in terms of fluorine concentration) as the solution to be treated. On the other hand, as a solution containing a tetramethylammonium compound, 180 g of an aqueous solution adjusted to a pH of 13.0 by adding an appropriate amount of acetic acid to an aqueous solution of tetramethylammonium hydroxide (TMAH) having a known concentration (pH 14 or higher) was prepared. In addition, the said aqueous solution contains the tetramethylammonium ion of the quantity corresponded to 0.29 mol.

[0047] The total amount of the solution to be treated and the total amount of the aqueous solution were put into a reaction container (capacity: about 1 L) equipped with a stirrer, and the container was stirred at room temperature for 5 minutes to perform the treatment. Ther...

Embodiment 2

[0054] Will replace lithium hexafluorophosphate with lithium tetrafluoroborate (LiBF 4 ), using ethylene carbonate and dimethyl carbonate as a solvent mixed solution 400g (containing an amount equivalent to 0.26mol in terms of lithium tetrafluoroborate) as the treated solution, in addition, according to the same method as in Example 1 conditions for the treatment of the treated solution. The fluorine concentration in the organic phase of the treated filtrate was 0.1% by weight, the fluorine concentration in the aqueous phase was 0.2% by weight, and the fluorine removal rate was 98%.

Embodiment 3

[0055] -Example 3 to Example 5-

[0056] The solution to be treated was treated under the same conditions as in Example 1, except that aqueous solutions of the respective tetramethylammonium (TMA) salts shown in Table 1 below were used as the solution containing the tetramethylammonium compound. In addition, each aqueous solution used contained the quantity equivalent to 0.29 mol as a tetramethylammonium ion. In Examples 3 to 5, the fluorine concentration in the organic phase of the treated filtrate was 0.2% by weight, the fluorine concentration in the aqueous phase was 0.2% by weight, and the fluorine removal rate was 97%.

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Abstract

Provided is a method with which it is possible to safely and cost-effectively treat a mixed solution including a specific fluorine-containing electrolyte and a carbonic acid ester. A tetramethylammonium compound (except for tetramethylammonium salts of fluorocomplexes) is added to a mixed solution including a carbonic acid ester and at least one type of compound selected from the group consisting of lithium hexafluorophosphate, lithium tetrafluoroborate, sodium hexafluorophosphate, lithium hexafluoroarsenate, and lithium hexafluoroantimonate; the tetramethylammonium salt(s) of the fluorocomplex(es) is / are precipitated; and then the precipitate is removed.

Description

technical field [0001] The present invention relates to a method for treating a mixed solution, and particularly relates to a method capable of advantageously treating a mixed solution used as an electrolyte solution of a lithium battery or the like. Background technique [0002] Conventionally, mixed solutions containing carbonates as solvents and electrolytes such as lithium hexafluorophosphate have been widely used as electrolyte solutions in lithium batteries, lithium ion batteries, lithium ion capacitors, etc. During, or when the type of manufacture is replaced, defective products are produced, etc., it is discharged as waste liquid in large quantities. [0003] Here, electrolytes such as lithium hexafluorophosphate contained in the above electrolytic solution (hereinafter referred to as fluorine-containing electrolyte) are thermally and chemically unstable compounds, so when the mixed solution containing it is directly used for incineration, it may cause Toxic and hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/02B01D3/00H01M10/54
CPCB01D3/009H01M10/052H01M10/54Y02E60/10Y02W30/84B01D9/02
Inventor 内野雄贵鸟居宽三森本亚季
Owner SANWA YUKA INDS