NGHI SON CHEMICALS EXPORT IMPORT COMPANY LIMITED

Phosphoric Acid 85%Min.(H3PO4)

Chemical Name :  Phosphoric Acid 85%Min.

Formula :               H3PO4

Grades :                Food Grade and Technical Grade

Cas No. :               7664-38-2

UN No. :                UN1805

Package :              35Kg/Jerrycan 

Origin :                  China, S.Korea…


Category : Textile Dyeing, Beverages, Waste Water Treatment, Mining Industry…

Product code:

Phosphoric Acid /H3PO4/PHOS
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Usage & Application in Textile Industry

Phosphoric Acid 85% (H₃PO₄) is a versatile, moderately strong mineral acid widely used as a pH adjuster, descaler, rust remover, and cleaning agent. Due to its controlled acidity and low corrosiveness compared to HCl or H₂SO₄, it is preferred in many industrial processes, including textiles.


1. Applications in Textile Industry

✔ 1. pH Adjustment After Dyeing

Phosphoric acid is used to neutralize alkaline residues after:

Reactive dyeing

Vat dyeing

Sulphur dyeing

Mercerization washing

Benefits:

Stable, controlled pH reduction

Prevents re-alkalization of fabric

Minimizes shade variation and improves fastness


✔ 2. Descaling & Rust Removal in Machines

Widely used for cleaning:

Dyeing machines

Pipelines

Heat exchangers

Pumps and nozzles

Functions:

Removes limescale (CaCO₃ deposits)

Dissolves iron oxide (rust)

Safe for most metals when diluted properly


✔ 3. Water Softening & Chelation

Phosphoric acid binds metal ions such as calcium and magnesium, improving:

Dye bath stability

Shade reproducibility

Water quality


✔ 4. Anti-Yellowing Agent After Bleaching

Helps neutralize residual alkali, preventing:

Yellowing during drying

Oxidation browning

Fiber degradation


✔ 5. Used in Dye Fixing & Finishing Processes

Phosphoric acid acts as:

A pH buffer in finishing baths

A catalyst in certain resin finishing agents

A neutralizer in softener formulations


6. Wastewater Treatment in Textile Plants

Used for:

pH adjustment before coagulation

Neutralization of alkaline streams

Precipitation of metals

Enhancing flocculation performance


2. Dosage Guidelines (Industry Range)

Dosage varies by fabric, process, and required pH.

Neutralization after dyeing: 0.5–3 g/L

Machine descaling: 1–5% solution

Metal removal (chelating): 0.1–0.5 g/L

Wastewater pH adjustment: based on influent alkalinity


3. Advantages

Strong but controlled acid – safer than HCl or H₂SO₄

Non-fuming and less corrosive

Excellent scale- and rust-removal properties

Highly effective pH stabilizer

Suitable for automated dosing systems


4. Applications in Other Industries

✔ Food & Beverage (Food Grade)

(Not applicable for industrial 85% unless specified food grade)

Acidulant, flavor enhancer

pH control in beverages, jams, cheese

Used in sweeteners production


✔ Detergent & Cleaning Products

Scale remover in industrial cleaning

Rust cleaner formulations

Dishwasher chemicals

Metal pre-treatment solutions


✔ Water Treatment

pH control in boiler and cooling systems

Scale control agent

Precipitation of calcium and magnesium


✔ Metal Finishing & Surface Treatment

Rust removal

Metal pickling

Phosphate coating preparation


✔ Agriculture & Fertilizer Production

Manufacturing of ammonium phosphate fertilizers

pH adjustment in irrigation systems

Nutrient additive in hydroponics


✔ Pharmaceuticals & Personal Care

(Only food/pharma grade)

Buffering agent

Toothpaste and oral care formulations


5. Safety & Handling

Corrosive — avoid skin and eye contact

Store in plastic (HDPE) tanks only

Keep away from strong oxidizers and bases

Use protective gloves, goggles, and apron

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