Method and device for producing phosphorus

Patent metadata

Field	Value
Publication number	US-12559372-B2
Application number	US-202017789051-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Dec 27, 2019
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A method for producing phosphorus in which a reaction for forming gaseous phosphorus (g) by bringing phosphorus oxide generated by heating a liquid phosphoric acid compound into contact with a carbon material to reduce the phosphorus oxide and for condensing the gaseous phosphorus (g) to obtain liquid phosphorus (L) is conducted by a flow reaction with a nonoxidizing gas flow, wherein the reduction reaction of the phosphorus oxide is conducted in a carbon material-packed bed, and the condensation of the formed gaseous phosphorus (g) is substantially conducted in a condensation accelerator-packed bed which is disposed downstream of the carbon material-packed bed in contact with the carbon material-packed bed.

First claim

The invention claimed is:

1 . A method for producing phosphorus, the method comprising:
a reduction reaction for forming gaseous phosphorus (g) by bringing phosphorus oxide generated by heating a liquid phosphoric acid compound into contact with a carbon material, and a condensation of the gaseous phosphorus (g) into liquid phosphorus (L), wherein the reduction reaction of the phosphorus oxide and the condensation of the gaseous phosphorus (g) are conducted by a flow reaction with a nonoxidizing gas flow, wherein the reduction reaction of the phosphorus oxide is conducted in a carbon material-packed bed, and the condensation of the gaseous phosphorus (g) is substantially conducted in a condensation accelerator-packed bed which is disposed downstream of the carbon material-packed bed and in contact with the carbon material-packed bed.

2 . The method for producing phosphorus according to claim 1 , wherein the liquid phosphorus (L) is obtained by continuously supplying the liquid phosphoric acid compound.

3 . The method for producing phosphorus according to claim 1 , wherein the liquid phosphoric acid compound is supplied by providing a porous carrier containing the liquid phosphoric acid compound.

4 . The method for producing phosphorus according to claim 1 , wherein the liquid phosphoric acid compound is supplied dropwise.

5 . The method for producing phosphorus according to claim 1 , wherein the liquid phosphoric acid compound is heated to 200 to 1000° C. to generate the phosphorus oxide, and a reduction reaction temperature of the phosphorus oxide is 700 to 1200° C.

6 . The method for producing phosphorus according to claim 1 , wherein a condensation temperature in the condensation accelerator-packed bed is in a temperature range of 44° C. or higher and lower than 280° C. or in a temperature range in which the gaseous phosphorus (g) substantially condenses.

7 . The method for producing phosphorus according to claim 1 , wherein the liquid phosphoric acid compound contains at least one selected from the group consisting of crude phosphoric acid, crude condensed phosphoric acid and crude phosphorous acid.

8 . The method for producing phosphorus according to claim 1 , wherein a heating temperature of the liquid phosphoric acid compound and a reduction reaction temperature of the phosphorus oxide are independently regulated.

9 . The method for producing phosphorus according to claim 1 ,
wherein the reduction reaction of the phosphorus oxide is conducted in the carbon material-packed bed by regulating at least one of a heating temperature of the liquid phosphoric acid compound and a nonoxidizing gas flow rate based on a total discharged gas flow rate of carbon monoxide gas and hydrogen gas generated through the reduction reaction of the phosphorus oxide.

10 . The method for producing phosphorus according to claim 1 , wherein unreacted phosphorus oxide is recovered in a container holding water disposed downstream of the condensation accelerator-packed bed in the reduction reaction of the phosphorus oxide.

11 . The method for producing phosphorus according to claim 1 , wherein the carbon material is supplied to the carbon material-packed bed depending on an amount of decrease in the carbon material in the carbon material-packed bed due to the reduction reaction of the phosphorus oxide so as to maintain the height of carbon material-packed bed in the range of the height of the carbon material bed at the beginning of the reaction ±10%.

12 . The method for producing phosphorus according to claim 1 , wherein the liquid phosphorus (L) is obtained by discontinuously supplying the liquid phosphoric acid compound.

Assignees

• Univ Tohoku

Inventors

• Nagasaka Tetsuya
• Miki Takahiro
• Matsubae Kazuyo
• Sasaki Yasushi

Classifications

• B01J2208/027

  Beds · CPC title

• B01J8/0292

  with stationary packing material in the bed, e.g. bricks, wire rings, baffles · CPC title

• B01J8/0285

  Heating or cooling the reactor (for tubular reactors in furnaces B01J8/062) · CPC title

• B01J8/0278

  Feeding reactive fluids (for solid material B01J8/0015) · CPC title

• C01B25/12

  Oxides of phosphorus · CPC title