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Phosphoric acid purification and reuse method

A phosphoric acid and acetic acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of inability to effectively purify, effectively recover waste acid waste, and difficult to generate economic benefits, so as to avoid treatment costs. Effect

Inactive Publication Date: 2006-12-20
TAIWAN FERTILIZER CO LTD
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Problems solved by technology

[0009] However, some methods currently used in waste acid recovery, such as ion exchange, electrolytic osmosis, diffusion osmosis, spray calcination and evaporation, etc., cannot effectively recover waste acid and avoid waste, and it is difficult to generate economic benefits
Moreover, these methods cannot effectively and economically purify and separate the acidic liquid of a single component.

Method used

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  • Phosphoric acid purification and reuse method
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Embodiment Construction

[0034] For the techniques, means and effects adopted in the present invention, a preferred embodiment is given here and detailed description is as follows in conjunction with the drawings.

[0035] figure 2 It is a schematic diagram of a preferred embodiment of the present invention. As shown in the figure, firstly, at normal temperature and pressure, using the fractional distillation circulation pump 2, it is made by mixing 40% to 70% phosphoric acid, 2% to 10% acetic acid, and 2% to 10% nitric acid, etc. The aluminum etching solution is pumped into the fractionation tower 3 from the aluminum etching solution storage tank 1, the agitator at the top of the fractionation tower is activated, and the stirring is uniform and continuous at a rate of 25-85 rpm. Because the vaporization temperature of nitric acid is relatively low, there is a partial pressure of nitric acid to vaporize under normal temperature and pressure, so the nitric acid gas can be pumped through the first con...

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Abstract

The invention provides a method of purification and recycle of phosphoric acid in aluminum etch liquid effectively, that comprises: (a) nitric is separated and removed from the aluminum etch liquid by fractional distillation; (b) acetate is separated from the remainder aluminum etch liquid treated by step (a); (c) alcohols is added to aluminum etch liquid treated by step (b), and the acetic esterification reaction take places to remove remainder little acetate; and (d) the acetic ester and water arisen from step(c) are removed and the phosphoric acid is recycled by fractional distillation. The method can acquire phosphoric acid the minimum purity of which is 70%.

Description

technical field [0001] The invention relates to a method for effectively purifying and recycling phosphoric acid, in particular to a method for purifying and reusing phosphoric acid for treating aluminum etching solution. Background technique [0002] Environmental issues have become the focus of global attention, and environmental protection is bound to become the mainstream of the future development of the international community. Most multinational companies or local industries have recognized that environmental protection will become the "quality" and "price" of enterprises after "quality" and "price". The most important key factor of "sustainable management", the previous concept that environmental protection and economic development are mutually reinforcing, has also undergone significant changes. It is generally recognized that "appropriate and reasonable environmental protection norms and standards can guide industrial innovation, more effectively use raw materials, ...

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Application Information

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IPC IPC(8): C01B25/234
Inventor 黄清晏黄耀兴许仓铣
Owner TAIWAN FERTILIZER CO LTD