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A method for removing impurity ions from an organic solvent loaded with phosphoric acid using ammonia

An organic solvent, impurity ion technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high requirements for separation equipment, limited selectivity, loss of phosphoric acid yield, etc., and achieves convenient process transformation and low price. , easy to operate effect

Active Publication Date: 2016-03-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, pure water or phosphoric acid products with high purity are generally used as detergents in production. Although they can effectively remove impurity ions in organic solvents, there are two important defects due to the limited selectivity of detergents to phosphoric acid and impurity ions. : First, it needs to operate under extreme comparison and more theoretical series, which requires high separation equipment; second, the loss of phosphoric acid yield is relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The mixed gas of ammonia and nitrogen is used as the detergent, and the mass fraction of ammonia is 30%. Weigh 400g of phosphoric acid-loaded isopropyl ether and place it in a 1L three-necked flask. Under stirring conditions, a gas scrubber is passed into the solvent by bubbling. The gas flow rate is 20sccm, and the ventilation time is 115min. The temperature of the whole operation process is controlled at 40oC, the upper part of the three-neck flask is connected with a condenser, and the loss of the organic solvent is avoided by water cooling. After aeration, continue to stir for 20 minutes, then stop stirring, let stand for 5 hours, separate phases with a separatory funnel, the organic phase in the upper layer is the purified isopropyl ether loaded with phosphoric acid.

Embodiment 2

[0016] Pure ammonia gas is used as the detergent, and the mass fraction of ammonia gas is 99.98%. Weigh 400g of methyl isobutyl ketone loaded with phosphoric acid and place it in a 1L three-necked flask, and feed gas scrubber into the solvent by bubbling under stirring conditions, the gas flow rate is 20 sccm, and the ventilation time is 90min. The temperature of the whole operation process was controlled at 10°C, and the upper part of the three-neck flask was connected with a condenser, and the loss of the organic solvent was avoided by water cooling. After aeration, continue to stir for 20 minutes, then stop stirring, let stand for 5 hours, separate phases with a separatory funnel, the organic phase in the upper layer is the purified methyl isobutyl ketone loaded with phosphoric acid.

Embodiment 3

[0018] The mixed gas of ammonia and air is used as the detergent, and the mass fraction of ammonia is 50%. Weigh 400 g of phosphoric acid-loaded methyl isobutyl ketone and place it in a 1L three-necked flask. Under stirring conditions, a gas scrubber is introduced into the solvent by bubbling. The gas flow rate is 15 sccm, and the aeration time is 48 min. The temperature of the whole operation process was controlled at 50°C, and the upper part of the three-necked flask was connected with a condenser, and the loss of the organic solvent was avoided by water cooling. After aeration, continue to stir for 20 minutes, then stop stirring, let stand for 5 hours, separate phases with a separatory funnel, the organic phase in the upper layer is the purified methyl isobutyl ketone loaded with phosphoric acid.

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Abstract

The invention discloses a method for removing foreign ions from an organic solvent loaded with phosphoric acid by ammonia gas. The method belongs to the technical field of chemical separation. According to the method, the ammonia gas or mixed gas of the ammonia gas and inert gas is used as a detergent; the mass ratio of the detergent to the organic solvent loaded with the phosphoric acid is 1:(150-3,000); at a temperature of 10 to 70 DEG C, two strands of materials are subjected to sufficient contact reaction and mass transfer, and then phase separation is carried out to obtain the purified organic solvent loaded with the phosphoric acid. Thrpugh the adoption of the method, a high metal ion removal rate can be realized in a single stage, the phosphoric acid loss rate is low, the operation of wet-process phosphoric acid extraction phase purification can be purified, and the efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a method for removing impurity ions from an organic solvent loaded with phosphoric acid by using ammonia gas. Background technique [0002] As an important inorganic acid, phosphoric acid is widely used in chemical, food, electronics and other industries. The current phosphoric acid production methods mainly include thermal method and wet method. Thermal phosphoric acid is a relatively pure phosphoric acid produced by oxidizing and absorbing yellow phosphorus by using the electric furnace method, but the process consumes a lot of power and costs, and the production process produces a lot of dust and toxic gases. Therefore, in terms of phosphoric acid and phosphate production, the thermal phosphoric acid process is gradually being replaced by the wet phosphoric acid process. The wet-process phosphoric acid process mainly uses inorganic acid (such as sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/46
Inventor 骆广生刘国涛吕阳成王凯
Owner TSINGHUA UNIV