Process for the manufacture of P4O6 with high yield

Abstract

A process for the production of a reaction product consisting essentially of P4O6 is carried out by reacting oxygen with phosphorus in an exothermic reaction in a reaction unit. Heat created by the exothermic reaction is removed by feeding P4O6 and / or by-products of the process into the reaction unit. The generated reaction product is then quenched to a lower temperature where no essential decomposition of the reaction product occurs, and at least part of P4O6 is separated from the reaction product obtained after quenching. The resulting yield of P4O6 based on the phosphorus used is improved and the heat of the exothermic reaction can be controlled in an economic way.

Description

technical field

[0001] The present invention relates to the experimental formula P 4 o 6 A process for the manufacture of phosphorus(III) oxide prepared by the reaction of phosphorus and oxygen, wherein the reaction product is obtained in high yield and in substantially pure form. It thus forms an excellent "building block" in the manufacture of organophosphorus(III) compounds, an industrially important class of chemicals (a term that when used herein generally includes it as starting material, raw material and intermediate the use of). As used herein the term "P 4 o 6 " is intended to include all formulas commonly used for phosphorus(III) oxide, such as P 2 o 3 (phosphorus trioxide). Background technique

[0002] P 4 o 6 It has not been prepared on a commercial scale before, and although it has been proposed, it has not been used commercially, for example as a building block for the manufacture of organophosphorus(III) compounds. instead of P 4 o 6 used as raw m...

Examples

Embodiment

[0040] 3.99 moles of white phosphorus (P 4 ) / hour of the stream was continuously fed into the evaporator and evaporated at 770K at atmospheric pressure. The resulting stream was fed into the chamber of a reactor with a volume of 7800 mL. 12 mol / h (as O 2 ) of continuous oxygen flow into the same reactor. A stream of 1105 g / h of the slurry already obtained in earlier experiments was fed into the reactor through a separate hole at the top of the reactor. The slurry consisted of 24 wt% higher solids P oxides and suboxides, 1% P 4 and 75% of P 4 o 6 composition. The slurry was held at 303K prior to addition. These reaction parameters correspond to a residence time in the reactor of 11 seconds. The reaction chamber was observed to reach a temperature of 1780K without external cooling. The reaction product leaving the reaction chamber at its outlet is then contacted with an earlier condensed liquid reaction product stream obtained from a previous experiment carried out unde...

technical field

[0001] The present invention relates to the experimental formula P 4 o 6 A process for the manufacture of phosphorus(III) oxide prepared by the reaction of phosphorus and oxygen, wherein the reaction product is obtained in high yield and in substantially pure form. It thus forms an excellent "building block" in the manufacture of organophosphorus(III) compounds, an industrially important class of chemicals (a term that when used herein generally includes it as starting material, raw material and intermediate the use of). As used herein the term "P 4 o 6 " is intended to include all formulas commonly used for phosphorus(III) oxide, such as P 2 o 3 (phosphorus trioxide). Background technique

[0002] P 4 o 6 It has not been prepared on a commercial scale before, and although it has been proposed, it has not been used commercially, for example as a building block for the manufacture of organophosphorus(III) compounds. instead of P 4 o 6 used as raw m...

Examples

Embodiment

[0040] 3.99 moles of white phosphorus (P 4 ) / hour of the stream was continuously fed into the evaporator and evaporated at 770K at atmospheric pressure. The resulting stream was fed into the chamber of a reactor with a volume of 7800 mL. 12 mol / h (as O 2 ) of continuous oxygen flow into the same reactor. A stream of 1105 g / h of the slurry already obtained in earlier experiments was fed into the reactor through a separate hole at the top of the reactor. The slurry consisted of 24 wt% higher solids P oxides and suboxides, 1% P 4 and 75% of P 4 o 6 composition. The slurry was held at 303K prior to addition. These reaction parameters correspond to a residence time in the reactor of 11 seconds. The reaction chamber was observed to reach a temperature of 1780K without external cooling. The reaction product leaving the reaction chamber at its outlet is then contacted with an earlier condensed liquid reaction product stream obtained from a previous experiment carried out unde...