Peanut or Groundnut Oil Pressing, Extraction and Refining Plant or the whole processing line working procedures:
1. Groundnut oil press process:
A. Groundnut →magnetic roller→Destoner→screening→grading( small group with higher quality and big group with normal quality)
-Magnetic roller is to remove metallic impurities.
-Destoner is to remove small stones.
-Screening is to remove other impurities.
-Grading is to divide groundnut into small group and big group.
B. Small group groundnut→cooking→pressing→crude oil→degumming→ first filtering →Second filtering→strong fragant edible groundnut oil
-Cooking: to change physical characters of groundnut in order to improve oil yield.
-Pressing: to press groundnut , get crude oil and oil cake
-Degumming:to make phosphatide absorb water and precipitated.
-First filter: to remove impurities and part of phosphatide
-Second filter: to remove phosphatide reaching national standard.
C. Big group groundnut →crushing →flaking →steam cooking →pressing → crude oil →degumming→ first filtering →Second filtering→edible groundnut oil
– Crushing : to crush groundnut into 4-6 pieces which fits flaking conditions
– Flaking : to flake crushed groundnut into thin and even pieces, thickness < 0.5mm
– Cooking , pressing until edile groundnut are same as above.
2. Groundnut oil extraction process
Pressed groundnut oil cake → Oil extractor→ Mixed oil→ Three evaporation→ Crude groundnut oil
wet meal → desolventizer → dry meal to package
– Oil extractor: using solvent N-hexane to extract oil from pressed oil cake
– Mixed oil/wet meal : after oil extractor, will get mixed oil with solvent and wet meal with solvent
– Three evaporation: using three muti-effective evaporators to transform solvent to gas which will be cooled down and collected by passing condensers.
– Desolventizer: to dry wet meal and evaporate solvent .
3. Groundnut oil refining process
Crude oil from oil extraction→ Degumming → Deacidification→Decoloration→ Deodorization→Refined groundnut oil
– Degumming: adding phosphoric acid (85%) to reduce gum and impurities inside crude oil
– Deacidification: adding alkali to neutralize free fatty acid , generates soapstock
– Decoloration: adding clay to bleach crude oil , clay quantity depends on quality of decoloration . Waste clay will be filtered .
– Deodorization: at high temperature vacuum conditions, using steam to remove odor impurities
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