Method for purifying raffinate

A raffinate acid, weight technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of simple phosphoric acid conditions, inability to adapt to raffinate acid purification, and high energy consumption

Active Publication Date: 2010-05-19
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the 1970s, due to the worldwide energy crisis and high electricity costs, the production and development of thermal phosphoric acid with high energy consumption have been severely restricted.
[0018] The existing solvent precipitation method for treating phosphoric acid has relatively simple conditions and limited impurity content, especially the content of metal ions, especially magnesium ions is not high, so it cannot be used for the purification of raffinate acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Measure 200mL (161g) of 95% ethanol into a 500mL separatory funnel, then measure 100mL (77g) of isopropanol into the separatory funnel, shake well to obtain a mixed solvent.

[0027] Measure P 2 o 5 75 mL (117 g) of raffinate with a concentration of 46.5% (weight) and a magnesium content of 2.1% (weight) was placed in a 500 mL Erlenmeyer flask with a stopper, and preheated in a constant temperature magnetic stirrer. After the temperature rises to 50°C, keep the temperature constant, and gradually add the mixed solvent from the separatory funnel; the addition time is about 40 minutes. After the solvent was added, the reaction was continued for 50 min. Then take it out and let it stand to cool to room temperature, the amount of the total substance in the Erlenmeyer flask is 355g.

[0028] Liquid-solid separation was carried out by decantation to obtain 37 g of viscose solid residue and 318 g of clear liquid. The serum recovery was 89.8% by weight.

[0029] Put the cl...

Embodiment 2

[0031] Measure the same raffinate 50mL (77g) as in Example 1 and place it in a 500mL conical flask with a stopper, measure 200mL (161g) of 95% ethanol and pour it into the conical flask, shake it up, then measure 50mL (38 g) isopropanol was added to the Erlenmeyer flask. After shaking well, put it into a constant temperature magnetic stirrer to preheat, start timing when the temperature rises to 65°C, and react at constant temperature for 90 minutes. Thereafter, it was taken out and allowed to stand to cool to room temperature, and the total amount of the mixture was 275 g.

[0032] Liquid-solid separation was carried out with a paper dry filter funnel, and a large solid residue was left in the Erlenmeyer flask, with an amount of 21 g. 3 g of a viscous residue and 251 g of a clear liquid were isolated. The serum recovery rate was 91.1%.

[0033] The clear liquid was put into a rotary evaporator, and distilled for 45 min at a vacuum degree of 0.08 MPa and a temperature of 80...

Embodiment 3

[0035] Weigh 300g (186mL) P 2 o 5 The raffinate with a concentration of 47.0% (weight) and a magnesium content of 2.8% (weight) was placed in a 1000mL beaker, and preheated to 75°C on a water bath, and 95% ethanol and isopropanol were added under stirring with a glass rod. Equal volumes were mixed to obtain 550 mL of the mixed solvent, and the reaction was continued for 30 min. After taking out the meter from the water bath and cooling to 35° C., 720 g of the mixture was obtained. 565 g of clear liquid were separated by decantation, and 143 g of impurity-containing liquid residue were separated. The serum recovery rate was 76.8%.

[0036] The supernatant liquid was sent to a rotary evaporator for distillation at a vacuum degree of 0.08 MPa and a temperature of 60°C. Control reclaims solvent amount and be 254g, obtain P 2 o 5 Concentration is 40.1% (weight) purification acid 305g, its magnesium content is 0.5% (weight), phosphorus yield is 82.8%. The removal rate of magne...

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Abstract

The invention discloses a method for purifying raffinate, which comprises the following steps: preheating the raffinate containing 40.0% (by weight)-47.0% (by weight) of P2O5 and 1.6% (by weight)-2.8% (by weight) of magnesium to 50-75 DEG C, then adding 3-5 times of the volume of mixed solvent under stirring, keeping the feeding time to be 0-40min, continuously carrying out reaction for 30-90min after completing the feeding, standing, cooling to room temperature-35 DEG C, and using filtration or decantation for obtaining clear solution. The clear solution is further distilled at the vacuum degree of 0.08MPa and the temperature of 60 DEG C-80 DEG C for recovering alcohol, thereby obtaining the purified raffinate. The method is characterized by good magnesium removal effect, low energy consumption and small solvent loss.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a method for purifying, treating and recovering raffinate. Background technique [0002] Since the 1970s, due to the worldwide energy crisis and high electricity costs, the production and development of thermal phosphoric acid with high energy consumption have been severely restricted. Phosphorus-containing industrial products must develop new sources of raw materials, thereby promoting and accelerating the research and development of wet-process phosphoric acid purification technology, and improving the competitiveness of wet-process phosphoric acid against thermal phosphoric acid. The quality of wet-process phosphoric acid purified by appropriate methods can meet industrial requirements, and the cost of purified wet-process phosphoric acid can be 20% to 30% lower than that of thermal phosphoric acid, and the energy consumption is only about 1 / 3. [0003] There are ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/238
Inventor 汤德元杨三可王邵东李红林汤正河冉瑞泉谭蕾孙应伦
Owner WENGFU (GRP) CO LTD
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