A process of coupling crystallization-electrodialysis-reverse osmosis to prepare electronic-grade phosphoric acid with different purity
A technology of electrodialysis and reverse osmosis, which is applied in the direction of phosphorus compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of relatively strict production process requirements, and achieve the effects of easy operation, pollution reduction, and no secondary pollution
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0032] In this example, a process flow of coupling crystallization-electrodialysis-reverse osmosis to prepare electronic-grade phosphoric acid with different purity is shown in figure 1 , including the following steps:
[0033] (1) Use crystallization to separate and remove impurities from industrial-grade phosphoric acid: such as figure 2 As shown, the crystallizer adopts a partitioned cylindrical vertical device with a length-to-diameter ratio of 8:1. The cold source uses industrial ethylene glycol, which is placed in a low-temperature coolant circulation pump to freeze to -12°C. The heat source uses industrial ethylene glycol. , placed in a water bath and heated to 45°C;
[0034] 1.1 Turn on the constant flow pump, transport industrial-grade phosphoric acid to the upper pipe of the crystallizer, ensure that the crystallizer is filled, then turn off the constant flow pump, turn on the low-temperature cooling liquid circulation pump, and continuously carry out refrigeration...
Embodiment 2
[0046] In this embodiment, a process of coupling crystallization-electrodialysis-reverse osmosis to prepare electronic-grade phosphoric acid of different purity is roughly the same as that of Example 1, except that:
[0047] (1) During the purification process of the electrodialysis method, the electrode is a platinum electrode, the temperature of the electrodialysis is 20°C, and the current density of the electrodialysis is 30A / dm 2 , the anion exchange membrane is polyvinyl chloride, and the cation exchange membrane is a polyethylene homogeneous ion exchange membrane;
[0048] (2) During the purification process of the reverse osmosis method, the mass concentration of phosphoric acid in the phosphoric acid solution to be treated is 15%, the operating pressure of the reverse osmosis is 0.5MPa, the reverse osmosis membrane is a polyamide permeable membrane, and the phosphoric acid The mass concentration of phosphoric acid in the concentrate is 78%.
[0049] In this example, t...
Embodiment 3
[0051] In this embodiment, a process of coupling crystallization-electrodialysis-reverse osmosis to prepare electronic-grade phosphoric acid of different purity is roughly the same as that of Example 1, except that:
[0052] (1) During the purification process of the electrodialysis method, the electrode is a ruthenium-coated titanium plate electrode, the temperature of the electrodialysis is 60°C, and the current density of the electrodialysis is 1A / dm 2 , the anion exchange membrane is a polytetrafluoroethylene homogeneous ion exchange membrane, and the cation exchange membrane is a sulfonic acid membrane;
[0053] (2) During the purification process of the reverse osmosis method, the mass concentration of phosphoric acid in the phosphoric acid solution to be treated is 1%, the operating pressure of the reverse osmosis is 10MPa, and the reverse osmosis membrane is a polyimide permeable membrane. The mass concentration of phosphoric acid in the phosphoric acid concentrated so...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More