Industry Grade 99% Potassium Pyrophosphate CAS 7320-34-5

What is Potassium pyrophosphate (CAS 7320-34-5)?

Potassium pyrophosphate (tetrapotassium pyrophosphate, TKPP) is a potassium salt of pyrophosphate. It is a member of the condensed phosphate (polyphosphate) family and is generally represented by the chemical formula:

K4P2O7 (CAS No. : 7320-34-5, molecular weight approx. 330.34)

It is white powder or lumpy solid at normal temperature, slightly hygroscopic, relative density 2.534, melting point about 1109℃. Potassium pyrophosphate is freely soluble in water (about 187 grams dissolves in 100 grams of water at 25°C), insoluble in ethanol, and its aqueous solution is alkaline (a 1% aqueous solution has a pH of about 10.2).

Potassium pyrophosphate are one of the four potassium ions ( K + ) and one of the pyrophosphate ions ( P 2 O 7 4- ) . About the molecular framework. Two phosphate ions undergo condensation and dehydration to form the pyrophosphate ion. Pyrophosphate can be chelated with calcium, magnesium and heavy metal ions. It has good dispersibility, buffering and emulsifying properties. This may be used as a buffer, chelating agent and analytical reagent in the laboratory field. In the consumer field, its water softening and dispersing abilities are used in household cleaning . The basis of its uses outside of the food and industrial sectors is the multi-functional combination of chelation, buffering and dispersion.

Chemically potassium pyrophosphate displays the common properties of condensed phosphates: its aqueous solutions are alkaline, it can chelate alkaline earth metal and heavy metal ions, and it is readily decomposed by heat (hydrolyzes to phosphates by long boiling). It is more soluble and chelating than sodium pyrophosphate. It should be stored in a sealed container in a dry place.

Potassium pyrophosphate other than for food and industrial grades means products for scientific research and consumer applications, mainly including reagent-grade grades. These grades emphasize the following indicators more than food-grade and industrial-grade products:

Control of Purity and Impurity

Reagent-grade reagents typically require that the main component is 99% or higher in purity (high-purity grades require even higher purity), and strictly control impurities such as iron, arsenic, heavy metals, etc.

insoluble matter in water

Water-insoluble matter may influence the purity and the buffering capacity of a reagent and must be maintained at a low level.

Buffering capacity and pH

The aqueous solution has alkaline buffering capacity which is an important indicator for laboratory applications .

Moisture

Potassium pyrophosphate is slightly hygroscopic, and excess moisture content influences the accuracy of measurement and stability of storage, thus it needs to be controlled and packaged in a sealed manner.

What other uses does Potassium pyrophosphate have?

1. Scientific research and laboratory use (reagent grade, core applications)

Potassium pyrophosphate is a common condensed phosphate reagent used in the lab. Suitable for chemical research on pyrophosphate, preparation of buffer solutions and metal ion chelation experiments. High-purity grades are used for scientific research experiments with strict purity requirements as well as routine reagents in chemistry and materials laboratories.

2. electroplating industry (central use)

In cyanide-free electroplating with pyrophosphates, potassium pyrophosphate is the principal complexing agent. It can replace highly toxic sodium cyanide in electroplating. It forms stable complexes with metal ions such as copper, zinc and tin, thus improving the conductivity of the plating solution and the cathodic polarization and improving the quality of the plating layer. It is widely used in cyanide-free copper plating, zinc plating, tin plating and pretreatment process of electroplating, and is an important raw material for environmentally friendly electroplating.

3. Domestic Soft water and domestic water treatment

Potassium pyrophosphate is used as a chelating agent for calcium and magnesium ions in household water softening equipment and hot water systems to prevent scale formation and to protect electrical appliances.

4. Ceramics and Coatings

In the ceramics industry, potassium pyrophosphate is used as a clay dispersant to improve the fluidity of ceramic slurries. It is also used as a dispersant and buffer for pigments and dyes, to help the pigments in coatings and paints, to disperse evenly and stabilize the system.

5. Cleaning and daily chemical products (consumer grade)

( 1 ) Active ingredients in household cleaning agents and descaling agents. Potassium pyrophosphate. It helps to soften hard water and remove scale and metal ion stains. You will find it in laundry detergent, toilet cleaner, kitchen cleaner and lots of other products we use.

(2) Potassium pyrophosphate is used in the formulation of metal surface cleaners, bottle cleaners and boiler descaling agents. Its chelating and dispersing action removes scale, oxide and stains from metal surfaces. It is used to clean bottles and cans in the food and beverage industry and to clean industrial equipment.

6. Moisture Retention and Tenderization (Core Application)

( 1 ) Potassium Pyrophosphate is an important Moisture Retention and Tenderizing agent in Meat Processing It can chelate metal ions in combination with sodium pyrophosphate, sodium tripolyphosphate, etc., promote the absorption of water and swelling of muscle protein, greatly improve the water retention and tenderness of meat products such as ham, sausage and meatballs, improve taste, and reduce cooking loss.

( 2 ) Potassium pyrophosphate is employed in the processing of aquatic products for retaining moisture in shrimp , fish balls , crab sticks and other products , decreasing loss of juice during thawing and cooking , improving color and elasticity of the products , and increasing the yield .

7.Emulsification and Stabilization

(1) Emulsifying Salt and Stabilizer for Dairy Products Potassium pyrophosphate is used as an emulsifying salt and stabilizer for dairy products. It helps even emulsification of dairy products such as cheese upon heating, prevents separation of oil and improves melting properties and texture.

(2) Potassium pyrophosphate can be used as a stabilizer and pH buffer for beverages, chelating metal ions in the beverage, preventing turbidity and precipitation, and helping to maintain the clarity and flavor stability of the beverage.

8. Improving quality of flour products

( 1 ) Potassium pyrophosphate . Flour products like noodle and dumpling wrapper . It can chelate metal ions, regulate gluten network structure, improve dough extensibility and finished products chewy texture.

( 2 ) Potassium pyrophosphate can act as an acid salt in combination leavening agents. It can be mixed with carbonates in baked food such as pastries and biscuits to control the rate of gas production and enhance the leavening effect.

9. Experiments in teaching and popular science

Potassium pyrophosphate can be used in chemical teaching demonstrations and experiments to demonstrate the properties of condensed phosphates, chelation reactions and buffering effects. It is a common teaching reagent in chemistry labs in middle schools and universities.

9. Other Uses

With the development of chemical and materials research, the application scope of potassium pyrophosphate is also expanding, including standard reagent supply, analytical testing services and customized fine chemicals.

Please note: reagent grade and consumer grade do not mean “risk-free”: potassium pyrophosphate is highly alkaline and can irritate eyes and skin. When used for experiments and cleaning, safety regulations should be followed to avoid inhaling the dust and skin contact.

Summary

Tetrapotassium Pyrophosphate (TKPP) is a white powdery condensed phosphate. It is readily soluble in water to give an alkaline aqueous solution. It has several functions such as chelation, buffering and dispersing. In everyday life it comes to us indirectly in the supply chains of electroplated hardware and electronic products, detergents, food, ceramic tiles, coatings and water treatment. In addition, reagent-grade potassium pyrophosphate is widely used in scientific research and laboratories, household cleaning and chemical products, household water softening, and educational experiments, which is an important phosphate chemical connecting “daily use” with “scientific research, health, and consumption.”