Soaps and Detergents

Source: TH

Context: Soaps and detergents are back in discussion due to growing focus on eco-friendly cleaning products and concerns over the environmental impact of synthetic surfactants.

About Soap and Detergents:

• What They Are?

• Soap: Sodium (Na) or potassium (K) salts of fatty acids, derived from vegetable oils or animal fats. Formula: RCOONa / RCOOK. Detergents: Synthetic cleaning agents made mainly from petrochemicals, with added surfactants, bleaches, and fragrances.

• Soap: Sodium (Na) or potassium (K) salts of fatty acids, derived from vegetable oils or animal fats. Formula: RCOONa / RCOOK.

• Detergents: Synthetic cleaning agents made mainly from petrochemicals, with added surfactants, bleaches, and fragrances.

• Chemicals Used:

• For Soap: Vegetable oils/fats (coconut, palm, olive, soybean) Caustic soda (NaOH) or caustic potash (KOH) Additives: perfumes (sandalwood oil, synthetic scents), colours, fillers (talc, sodium silicate), surfactants (sodium lauryl sulphate), antibacterial/antifungal agents (neem oil, triclosan). For Detergents: Surfactants (linear alkyl benzene sulphonate, sodium lauryl sulphate) Builders (sodium carbonate, phosphates) Enzymes, bleaches, dyes, perfumes

• Vegetable oils/fats (coconut, palm, olive, soybean)

• Caustic soda (NaOH) or caustic potash (KOH)

• Additives: perfumes (sandalwood oil, synthetic scents), colours, fillers (talc, sodium silicate), surfactants (sodium lauryl sulphate), antibacterial/antifungal agents (neem oil, triclosan).

• For Detergents: Surfactants (linear alkyl benzene sulphonate, sodium lauryl sulphate) Builders (sodium carbonate, phosphates) Enzymes, bleaches, dyes, perfumes

• Surfactants (linear alkyl benzene sulphonate, sodium lauryl sulphate)

• Builders (sodium carbonate, phosphates)

• Enzymes, bleaches, dyes, perfumes

• How They Are Manufactured? Soap-making (modern process):

• Soap-making (modern process):

• Conversion: Vegetable oils → fatty acids (using high-temp hydrolysis). Reaction: Fatty acids + NaOH → soap + water. Drying: Excess water removed, producing soap “noodles.” Blending: Noodles mixed with perfume, colours, fillers, surfactants, additives. Shaping: Extruded, cut, stamped into bars/cakes. Packaging: Wrapped and shipped.

• Conversion: Vegetable oils → fatty acids (using high-temp hydrolysis).

• Reaction: Fatty acids + NaOH → soap + water.

• Drying: Excess water removed, producing soap “noodles.”

• Blending: Noodles mixed with perfume, colours, fillers, surfactants, additives.

• Shaping: Extruded, cut, stamped into bars/cakes.

• Packaging: Wrapped and shipped.

• Detergent-making:

• Sulphonation: Hydrocarbons treated with sulphuric acid → surfactant base. Neutralisation: Surfactant neutralised with alkali (NaOH). Mixing: Builders (phosphates, carbonates), enzymes, perfumes, dyes added. Spray-drying / agglomeration: Powder detergents formed. Packaging: Packed into sachets, boxes, or bottles.

• Sulphonation: Hydrocarbons treated with sulphuric acid → surfactant base.

• Neutralisation: Surfactant neutralised with alkali (NaOH).

• Mixing: Builders (phosphates, carbonates), enzymes, perfumes, dyes added.

• Spray-drying / agglomeration: Powder detergents formed.

• Packaging: Packed into sachets, boxes, or bottles.

Difference Between Soaps and Detergents:

Feature | Soap | Detergent

Base material | Natural oils/fats (animal/plant) | Synthetic petrochemicals

Key chemical | Sodium or potassium salt of fatty acid | Surfactants (sulphonates, sulphates)

Cleaning efficiency | Works best in soft water | Works in both soft & hard water

Eco-impact | Biodegradable, environment-friendly | Some surfactants cause water pollution

Forms | Bars, liquid soaps | Powder, liquid, gels