The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (P.sub.4O.sub.6)). Phosphorus (III) oxides such as P.sub.4O.sub.6 are useful products and are also useful as precursors in preparation of other products, including phosphorous acid (H.sub.3PO.sub.3) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during P.sub.4O.sub.6 production as precursors for the formation of phosphoric acid (H.sub.3PO.sub.4) and P.sub.2O.sub.5. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., P.sub.4O.sub.6) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.

A total heat energy recovery system for furnace-process phosphoric acid is disclosed by the present disclosure, and relates to the technical field of phosphorus chemical industry. The system comprises a phosphorus burning tower, a hydration tower, an absorption tower, a Venturi tube, a demister, an induced draft fan, a deaerator, an economizer, a dilute acid circulating tank, a phosphoric acid pump, and a feedwater pump. In consideration of the whole process system, fresh soft water is deoxidized after being heated by an upper head of the phosphorus burning tower and a gas guide tube, and the deoxidized water is then pumped into the economizer by a high-pressure pump to recover the heat of the hydration tower and then enters a steam pocket of the phosphorus burning tower to generate medium-high pressure steam. Therefore, unified recovery of the heat of a furnace-process phosphoric acid device is achieved, the medium-high pressure steam is generated, the effective energy is improved, a circulating cooling tower of the furnace-process phosphoric acid device is omitted, and the production system is efficient, energy-saving, environment-friendly, and green.

A total heat energy recovery system for furnace-process phosphoric acid is disclosed by the present disclosure, and relates to the technical field of phosphorus chemical industry. The system comprises a phosphorus burning tower, a hydration tower, an absorption tower, a Venturi tube, a demister, an induced draft fan, a deaerator, an economizer, a dilute acid circulating tank, a phosphoric acid pump, and a feedwater pump. In consideration of the whole process system, fresh soft water is deoxidized after being heated by an upper head of the phosphorus burning tower and a gas guide tube, and the deoxidized water is then pumped into the economizer by a high-pressure pump to recover the heat of the hydration tower and then enters a steam pocket of the phosphorus burning tower to generate medium-high pressure steam. Therefore, unified recovery of the heat of a furnace-process phosphoric acid device is achieved, the medium-high pressure steam is generated, the effective energy is improved, a circulating cooling tower of the furnace-process phosphoric acid device is omitted, and the production system is efficient, energy-saving, environment-friendly, and green.

The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (P.sub.4O.sub.6)). Phosphorus (III) oxides such as P.sub.4O.sub.6 are useful products and are also useful as precursors in preparation of other products, including phosphorous acid (H.sub.3PO.sub.3) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during P.sub.4O.sub.6 production as precursors for the formation of phosphoric acid (H.sub.3PO.sub.4) and P.sub.2O.sub.5. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., P.sub.4O.sub.6) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.

The present invention is generally directed to improved processes for the preparation of various phosphorus oxides and phosphoric acid. Phosphorus oxides prepared in accordance with the present invention include phosphorus (III) oxides (e.g., tetraphosphorus hexaoxide (P.sub.4O.sub.6)). Phosphorus (III) oxides such as P.sub.4O.sub.6 are useful products and are also useful as precursors in preparation of other products, including phosphorous acid (H.sub.3PO.sub.3) and other phosphorus-containing chemicals. Certain aspects of this invention are also directed to using various byproducts formed during P.sub.4O.sub.6 production as precursors for the formation of phosphoric acid (H.sub.3PO.sub.4) and P.sub.2O.sub.5. In particular, the present invention is directed to improved processes for the preparation of phosphorus (III) oxides (e.g., P.sub.4O.sub.6) suitable for use in the preparation of phospho-herbicides such N-(phosphonomethyl)glycine (glyphosate) and precursors thereof (e.g., N-(phosphonomethyl)iminodiacetic acid (PMIDA)). The present invention is thus further directed to preparation of these compounds.

A process for removing metals and other impurities in a phosphate-containing material, comprising causing the material to react with a metal removing agent which comprises an organophosphorus compound. The process may be integrated to existing transportation and/or storage facilities for phosphate-containing materials.

A process for removing metals and other impurities in a phosphate-containing material, comprising causing the material to react with a metal removing agent which comprises an organophosphorus compound. The process may be integrated to existing transportation and/or storage facilities for phosphate-containing materials.

The present invention introduces natural and environmentally acceptable (friendly) chemical compositions for fire-fighting liquids and additives, as well as additives for enhanced oil recovery, oil & gas operation facilities and ships, oil refineries and petrochemical industry, drilling and drilling operations, corrosion protection, de-scaling and scaling prevention, cleaning of raw wool, cotton, textile and fabrics, general industrial cleaning and paint/coating removal, leather, fur and skin industries, sewage and effluent treatment, agriculture, meat, fish and poultry industries, olive oil, vegetable oils, and fruit juice industries, health and beauty and pharmaceutical industries, microbial control and insecticide/biocide, soil remediation, and heat and energy conducting fluids.

The present invention introduces natural and environmentally acceptable (friendly) chemical compositions for fire-fighting liquids and additives, as well as additives for enhanced oil recovery, oil & gas operation facilities and ships, oil refineries and petrochemical industry, drilling and drilling operations, corrosion protection, de-scaling and scaling prevention, cleaning of raw wool, cotton, textile and fabrics, general industrial cleaning and paint/coating removal, leather, fur and skin industries, sewage and effluent treatment, agriculture, meat, fish and poultry industries, olive oil, vegetable oils, and fruit juice industries, health and beauty and pharmaceutical industries, microbial control and insecticide/biocide, soil remediation, and heat and energy conducting fluids.

A phosphorus production method can include reducing feed containing phosphate ore and providing a silica ratio from 0.3 to 0.7 in a reaction chamber from 1250 to 1380 C. Less than 20% of the phosphate remains in the residue. Another phosphorus production method includes continuously moving a reducing bed through the reaction chamber with the feed agglomerates substantially stable while in the reducing bed. Reaction chamber temperature can be from 1250 to 1380 C. A phosphorus production system includes a barrier wall segmenting the reaction chamber into a reduction zone differentiated from a preheat zone. The bed floor is configured to move continuously from the preheat zone to the reduction zone during operation. A method for producing a reduction product includes exothermically oxidizing reduction/oxidation products in the reaction chamber, thereby adding heat to the reducing bed from the freeboard as a second heat source.