Soft Soap Base for Phenyl Manufacturing – Complete 1 KG Process
A properly prepared soap base plays an important role in traditional phenyl manufacturing. In this process, Castor Oil is saponified with Caustic Soda (NaOH) to prepare a soap base that can subsequently be used in phenyl formulations.
Technical note: Because NaOH is used here, the resulting material is technically a sodium castor-oil soap. The term “soft soap” is commonly used in the market for such soap bases, although true soft soap generally refers to potassium soaps.
🧪 1 KG BATCH FORMULA
| Raw Material | Quantity |
|---|---|
| Castor Oil | 400 g |
| Caustic Soda (NaOH) | 50 g |
| Water | 550 g |
| Total Batch Input | 1000 g |
Water Distribution
- 150 g Water → For Caustic Soda Solution
- 400 g Water → For Main Batch
- Total Water = 550 g
🏭 COMPLETE MANUFACTURING PROCESS
STEP 1 — Preparation of Caustic Soda Solution
Take a clean, heat-resistant container.
Add:
50 g Caustic Soda (NaOH)
Slowly add:
150 g Water
Mix carefully until the Caustic Soda is completely dissolved.
The solution will generate considerable heat during dissolution. After complete dissolution, keep the solution aside for approximately 30 minutes to cool.
⚠️ Safety
Always add Caustic Soda to Water, never water to solid Caustic Soda.
Wear chemical-resistant gloves, safety goggles and protective clothing.
STEP 2 — Prepare the Main Batch
Take a suitable stainless-steel or chemically compatible vessel.
Add:
400 g Water
Place the vessel on the heating source.
Maintain LOW HEAT.
Now slowly add the previously prepared 150 g Caustic Soda Solution into the 400 g water while continuously stirring.
Mix properly so that the solution becomes uniform.
STEP 3 — Add Castor Oil
Now start adding:
400 g Castor Oil
Add the Castor Oil slowly and gradually while continuously stirring.
Do not add the entire quantity at once.
Maintain low heat and continue slow, uniform stirring throughout the addition.
STEP 4 — Saponification / Soap Formation
Continue heating on low flame while stirring continuously.
Initially, the mixture may appear milky or cloudy.
As the reaction progresses, the mixture should become more uniform and gradually clearer.
Continue the process until the batch reaches a uniform, clear/transparent soap-base appearance.
The actual processing time can vary depending on the quality of Castor Oil, NaOH concentration, temperature and mixing efficiency. Therefore, do not rely only on a fixed heating time.
STEP 5 — Cooling & Resting
Once the desired uniform/transparent soap-base appearance is achieved:
- Turn off the heat.
- Stop heating.
- Allow the material to cool.
- Keep the batch undisturbed for 3–4 hours.
This resting period allows the soap base to stabilize and helps entrapped air and any settled material separate.
✅ FINAL SOAP BASE
After the resting period, the prepared Castor Oil Soap Base is ready to be used as a component in phenyl manufacturing.
PROCESS FLOW
50 g NaOH
＋
150 g Water
↓
Mix & Cool for 30 Minutes
↓
400 g Water in Main Vessel
↓
Add NaOH Solution
↓
Low Heat + Stirring
↓
Slowly Add 400 g Castor Oil
↓
Continuous Mixing & Low Heating
↓
Uniform/Clear Soap Base
↓
Rest for 3–4 Hours
↓
SOAP BASE READY
💰 APPROXIMATE RAW MATERIAL COST
Using your current raw-material rates:
Castor Oil: ₹260/kg
400 g = ₹104.00
Caustic Soda: ₹90/kg
50 g = ₹4.50
Total:
₹104 + ₹4.50 = ₹108.50/kg
Water, electricity, labour, processing loss and packaging are not included.
⚠️ IMPORTANT QUALITY & SAFETY NOTE
Before commercial production, verify the Castor Oil SAP value and actual NaOH purity because the exact alkali requirement depends on the raw-material specifications. The finished soap base should also be checked for free/residual alkali before incorporation into a commercial product.
This formulation/process is intended for trained manufacturing use. NaOH is highly corrosive and the process should be performed with appropriate PPE and suitable equipment.
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