Rapeseeds Cake Extraction Machine

Introduction

One of the most basic needs of mankind is an abundant and reliable food supply. In the modern world, one major source of protein and vegetable oil is from oilseeds, particularly the soybean – an abundant resource which is largely processed using solvent extraction, an efficient and reliable means to separate the high-protein meal solids from the high-energy edible oil. The second most prevalent solvent-extracted oilseed is rapeseed. Sunflower is also quite high in volume.

A much lower volume or secondary use for rapeseed oil, gaining popularity in recent years, is as a feedstock for biodiesel fuels for diesel engines. There are many other products such as oleochemicals made from oilseeds – and often these are provided with a solvent extraction system as a part of the total supply process.

Why solvent extraction? One early means of separation was physical pressure to ‘squeeze the oil out’. The most energy efficient, practical embodiment of that method is the modern screw press. This is a conveyor screw with a slotted cage surrounding it and a screw with diminishing space for the solid material as the material proceeds from pitch to pitch of the screw. Eventually, as the free space is progressively restricted, the oil is squeezed out of the solids and through the slots. More than half of the oil is easily removed in this way, but perhaps 7% or 8% residual oil is left in the solids, the process uses considerable horsepower, there is considerable wear and maintenance, and it takes many machines for high capacity. In comparison, solvent extraction with hexane (the primary solvent used worldwide) will remove all but about ½% of residual oil, uses less horse power, and requires less maintenance. It is relatively efficient and reliable, and this is one reason why solvent extraction is the primary means of separating large tonnages of oil from protein meal.

Technical Parameters

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