Polyanionic cellulose (PAC)

ARAS PETROCHEMICAL COMPANY

Polyanionic cellulose (PAC) is a type of water-soluble cellulose derivative used primarily as a viscosifier, filtration control agent, and rheology modifier in various industries, including oil drilling, pharmaceuticals, and food processing. It's commonly employed in drilling fluids to control fluid viscosity and prevent fluid loss.

How is polyanionic cellulose produced?

Polyanionic cellulose is typically produced through chemical modification of cellulose, which is derived from natural sources such as wood pulp or cotton linters. The process involves etherification and carboxymethylation of cellulose to introduce anionic (negatively charged) groups onto the cellulose backbone. This modification enhances the water solubility and rheological properties of cellulose, resulting in the formation of polyanionic cellulose. The exact production process can vary depending on the desired properties and applications of the final product.

Types of polyanionic cellulose:

Polyanionic cellulose (PAC) can be classified into various types based on factors such as degree of substitution (DS), molecular weight, and particle size. Common types include:

Low DS PAC: These types have a lower degree of substitution, resulting in less anionic charge density. They are often used in applications where a moderate increase in viscosity and fluid loss control is required.

Medium DS PAC: These PAC types have a moderate degree of substitution, offering improved viscosity and fluid loss control compared to low DS PAC. They find applications in a wide range of industries, including drilling fluids, pharmaceuticals, and food processing.

High DS PAC: High DS PACs have a higher degree of substitution, providing greater anionic charge density and enhanced rheological properties. They are typically used in demanding applications where high viscosity and superior fluid loss control are critical.

Fine Particle PAC: These PAC types have smaller particle sizes, which can improve fluid rheology and filtration control in drilling fluids. They are often preferred for applications requiring fine control over fluid properties.

These are just general classifications, and there may be variations and specific formulations tailored to different industries and applications.

Polyanionic cellulose uses:

Polyanionic cellulose (PAC) finds a variety of uses across different industries due to its water-solubility, rheological properties, and ability to control fluid viscosity and filtration. Some common uses include:

Oil and Gas Industry: PAC is widely used in drilling fluids as a viscosifier and filtration control agent to maintain wellbore stability, control fluid loss, and suspend solids during drilling operations.

Pharmaceuticals: In pharmaceutical formulations, PAC can serve as a binder, disintegrant, and viscosity modifier in tablet manufacturing. It helps control the release of active ingredients and improve tablet integrity.

Food Industry: PAC is used as a thickener, stabilizer, and emulsifier in food products such as sauces, dressings, and dairy products. It helps improve texture, prevent syneresis, and enhance shelf stability.

Construction Industry: PAC is utilized in cement and concrete formulations to improve workability, reduce water loss, and enhance the performance of cement slurries. It aids in preventing fluid loss and controlling rheological properties during cementing operations.

Paper and Textile Industry: PAC can be added to paper and textile coatings to enhance strength, water resistance, and printability. It also helps control viscosity during the production process.

Water Treatment: PAC is employed in water treatment processes as a flocculant and coagulant aid to remove suspended solids, organic matter, and color from water, thereby improving clarity and quality.

These are just a few examples of the diverse applications of polyanionic cellulose. Its versatility and beneficial properties make it a valuable additive in various industrial processes.

Read more about PAC in our company website:

https://www.petroacc.com/products/polyanionic-cellulose

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