LECTURE 10 PHOSPORUS INDUSTRIES Phosphorus (P) is a vital resource for sustaining world agriculture .

LECTURE 10 PHOSPORUS INDUSTRIESPHOSPHORUS (P) IS A VITAL RESOURCE FOR SUSTAINING WORLD AGRICULTURE.

Ch 61 Industrial Chem

EXAM II Feb. 1 Wed.

Graduating Students:Review Paper on any Philippine based Chemical Industry. Focus on any:

Chemical Transformations and Material Balance (Cost Analysis)

Unit Processes / Unit OperationsEnergy Requirements & ConservationWaste Management & Environmental Protection

Program

Format: Choose any:Powerpoint Presentation (15-20

pages)Wikipedia Article format (2-3 pages)Technical report format (3-4 pages)

Due: February 24, Fridayemail to: [email protected]

PHOSPHORUS - USES Phosphates are used to make special glass that is an important

component of sodium lamps. Phosphorus is an essential nutrient for plants. It is, therefore, added

to fertilizers. In the laboratory, two radioactive isotopes of phosphorus can be

used as radioactive tracers. Calcium phosphate can be used to make fine china. The strikers for matchsticks are made from phosphorus. Flares and

safety matches are also made from phosphorus. White phosphorus is used in incendiary bombs, smoke screens (such

as smoke bombs) and tracer ammunition.

Tributylphosphate, a compound of phosphorus, is used to extract uranium. This is called the Purex process.

Phosphorus is an important component of DNA and RNA. Phosphorus is used in the production of steel. Sodium tripolyphosphate is used in laundry detergents in some

parts of the world. It helps in the cleaning of clothes. However, some countries have banned them as it leads to the killing of fish when leaked into waterways.

Other compounds of phosphorus are used in the manufacture of pesticides, food additives, toothpaste and fertilizers.

PHOSPHATE ROCKPhosphate rock (PR) is a globally accepted but imprecise term describing any naturally occurring geological material that contains one or more phosphate minerals suitable for commercial use.Flourapatite admixed with various proportions of other compounds of Ca, F, Fe, Al, and Si.Flourapatite: CaF2

.3Ca3(PO4)2, an extremely insoluble compound, Ca10F2(PO4)6

PHOSPHATE ROCK PROCESSINGACIDULATION: The process of treating a fertilizer source with an acid. The most common process is treatment of phosphate rock with an acid (or mixture of acids) such as sulfuric, nitric, or phosphoric acid. PRODUCTS: Superphosphates, phosphoric acid, triple superphosphates, monoammonium phosphate,

PHOSPHATE ROCK PROCESSINGELECTRIC FURNACE REDUCTION: Phosphate rock is blended with coke (reducing agent) and silica. Charged with electric current forming gaseous P, later condensed to liquid P.PRODUCTS: P, P2O5

SUPERPHOSPHATESProduct of the acidulation process:Ca3(PO4)2 + H2SO4 + 2H2O → CaH4(PO4)2 + 2CaSO4

monocalciumphosphate

CaF2 + H2SO4 + 2H2O CaSO4 + HF4HF +SiO2 → SiF4 + 2H2O3SiF4 + 2H2O → SiO2 + 2H2SiF6

MANUFACTURE OF SUPERPHOSPHATEPreparation of phosphate rockMixing with acidCuring and drying of the slurryMilling and bagging

TRIPLE SUPERPHOSPHATE- A more concentrated fertilizer (in terms

of P2O5 content) nearly 3X vs. superphosphate.

- PR + 14H3PO4 → 10 Ca(H2PO4)2 + HF

PHOSPHORIC ACIDUses:Fertilizers – 85%Detergent materialsAnimal feedFood, beverages

PHOSPHORIC ACIDS - MANUFACTUREWET PROCESS:Ca3(PO4)2 + 3H2O + 4H2O 2H3PO4 + 3CaSO4

Wet process phosphoric acid normally contains 26 to 30 percent P2O5. In most cases, the acid must be further concentrated to meet phosphate feed material specifications for fertilizer production.Depending on the types of fertilizer to be produced, phosphoric acid is usually concentrated to 40 to 55 percent P2O5 by using 2 or 3 vacuum evaporators.

MANUFACTURE OF PHOSPHORIC ACIDTHERMAL:Raw materials for the production of phosphoric acid by the thermal process are elemental (yellow) phosphorus, air, and water. Thermal process phosphoric acid manufacture involves 3 major steps: (1) combustion, (2) hydration, and(3) demisting.

PHOSPHORUSELECTRIC FURNACE REDUCTION:3Ca3(PO4)2 + 6SiO2 + 10C → CaSiO3 + P4 + 10CO

SODIUM HOSPHATESVarious forms:Orthophosphates: MSP NaH2PO4

DSP Na2HPO4

TSP Na3HPO4

Manufactuted from Phosphoric acid and Soda ash / caustic soda.

PYROPHOSPHATE / TRIPOLYPHOSPHATE Used as water softenersTripolyphosphate: (STPP)NaH2PO4 + 2Na2HPO4 Na5P3O10 + 2H2OPyrophosphate: (TSPP)2Na2HPO4 Na4P2O7 + H2O

LECTURE 11 POTASSIUM INDUSTRIESPHOSPHORUS (P) IS A VITAL RESOURCE FOR SUSTAINING WORLD AGRICULTURE.

Ch 61 Industrial Chem

POTASSIUMUSES:Used in the production of alloys (heat transfer)Manufacture of KO2 in life support systemsManufacture:Na + KCl K + NaCl

POTASSIUM CHLORIDEUses:FertilizerMANUFACTURE: TRONA PROCESS

POTASSIUM SULFATEUSES:FertilizersProduction:Na2CO3

.2Na2SO4 (burkeite) + KCl

POTASSIUM BISULFATEUSES:Ceramics

Manufacture:K2SO4 + H2SO4 2KHSO4

POTASSIUM HYDROXIDECaustic PotashUses:Production of other K salts (K2CO3, KMnO4, etc)KCl for liquid fertilizersPesticides and other chemicalsManufacture: Electrolysis

POTASSIUM CARBONATE

Uses:-pottery, soaps, adsorbent for acid gasesManufacture:CO2 + 2KOH + H2O

POTASSIUM PERMANGANATEUSES:Laboratory oxidizing agents (an expensive oxidizing agent)Manufacture:Passing CO2 through a KMnO3 solutionKMnO3 from MnO2 + KOH + O2

Potassium BromideUses: photographic emulsions, photoengraving,Sedative,

Manufacture:3Fe + 4Br2 Fe3Br8

Fe3Br8 + 4K2CO3 + 4H2O 8KBr + 2Fe(OH)3 + 4CO2