Subcritical No. 4 Solvent Extraction Production Line

Subcritical extraction technology is a bit different from common used no. 6 solvent oil extraction machine. This advanced subcritical fluid extraction is mainly used to extract oil from those of precious oilseeds such as tomato seed, grape seed, watermelon seed, pumpkin seed, walnut kernel etc.

Oil extraction technology pioneered in 1855 by E.Deiss (Franch), and formed a production scale industry in 1870. The application of oil extraction sufficiently improves utilization of plant oil. There are at least 12 kinds of solvent used for extraction: e.g., carbon disulfide; crude hydrocarbon fuel; ethanol; method of water; petroleum hydrocarbons; benzene; halogenated hydrocarbons; isopropanol; formaldehyde, furfural; one, acetone, methyl ethyl ketone, supercritical carbon dioxide; mixed solvent etc.

The domestic edible oil extraction mainly uses 6# solvent, foreigners generally uses industrial hexane, octane or pentane for oil extraction.
4# solvent (the main component of liquefied propane, butane) oil extraction technology is also called subcritical extraction technology. It is a very new oil production technology, which has significant economic and social benefits while comparing with 6# solvent.

Subcritical No.4 solvent extraction featured characteristics:
● Normal temperature extraction, low temperature desolventization
● No destroy of active substance and plant protein of oil materials in oil extraction
● Applicable for precious oil and vegetal protein extraction
● Low vapor consumption, reduces 80% coal consumption in oil processing
● Low cost, big scale, and low environmental protection

Subcritical 4# solvent oil extraction principle:

4# solvent is purified from liquefied petroleum gas, consisting of propane, butane, boiling point is below 0 ℃. Oil extraction machine is processing under pressure (0.1-0.7Mpa liquid state) and room temperature to realize normal temperature oil extraction. Solvent in extracted meal and crude oil is removed at low temperature and vacuum. Solvent is cycled use after liquefaction.

Crude oil quality after subcritical 4# solvent extraction:
4# solvent has low boiling point, pure ingredients, and low residual solvent after extraction, low extraction temperature, good selection, less pigment, phospholipids and other impurities. No. solvent subcritical oil extraction method is an efficient method to maintain original flavor of oil, and keep maintain protein content from being changed caused by high temperature extraction and desolvent etc. The normal temperature subcritical solvent extraction machine is highly recommend choice for extraction of treasured oilseed materials.