Use of leaching solvent in preparing edible fat and oil

Abstract

A leaching solvent used for preparing edible oils is characterized in that the solvent is applied to the leaching process of edible oil preparation so as to leach oil from materials. The solvent consists of the following components by weight ratio: 94 to 100 percent of isohexane, 0 to 3 percent of normal hexane and 0 to 3 percent of butane and pentane; the leaching process includes the following steps of: 1) leaching: the leaching temperature is 48 to 53 DEG C and a mass ratio between the materials and solvent is 1/1 to 0.8; mixed oil and leached wet meal are obtained; 2) desolventizing: the finished meal is obtained; 3) the evaporation of a first long-tube; 4) the evaporation of a second long-tube; mixed oil is obtained; and 5) steam stripping: raw oil is obtained. The solvent of the invention is mainly composed of isohexane so as to largely reduce the harm to the health of operators exposed in the manufacturing environment; the product quality can be enhanced and the protection to environment can be enhanced; the latent heat for the evaporation of isohexane is low and then the energy cost required by the solvent recycling can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of edible oil processing, in particular to the application of a leaching solvent in preparing edible oil. Background technique [0002] In the current industrial leaching process for preparing edible oils and fats, the pressed cake from which a part of the oil has been squeezed is leached with an extraction solvent to extract the remaining oil in the pressed cake, thereby increasing the oil yield and obtaining meal products at the same time. Most of the leaching solvents used are aliphatic hydrocarbons, and the common ones are hexane solvent and No. 6 solvent with n-hexane as the main component. There are following deficiencies in the existing edible oil leaching solvent: [0003] (1) Health hazard: 96-98% of the currently used industrial hexane is n-hexane. N-hexane is a solvent with low toxicity and accumulation effect. It mainly enters the human body through the respiratory tract, and can also be absorbed throug...

AI Technical Summary

Problems solved by technology

Due to the use of solvent leaching to produce oil at the same time, solvent loss will inevitably occur during production, which will be discharged into the atmosphere and cause environmental pollution.

[0005] (3) Poor product quality: currently used is a mixture of a large number of hydrocarbons, the main components are linear alkanes, cycloalkanes and a small amount of aromatic hydrocarbons, and a small amount of unsaturated hydrocarbons

Its distillation range is 60-90°C. Due to its wide distillation range and high boiling point, the leached wet meal needs to be evaporated at high temperature and for a long time to obtain qualified finished meal, but this will seriously affect the quality of the meal. Soluble protein Greatly reduced

[0006] (4) High production energy consumption: Due to the wide distillation range and high boiling point of the currently used solvents, it is difficult to control the evaporation temperature of the mixed oil, and the amount of steam required for heating is also large, thereby increasing the acid value and color of the oil; at the same time , the amount of cooling water circulation is large when the solvent vapor is cooled and recovered, which directly leads to high production costs

[0007] The above-mentioned problems have been plaguing the oil processing industry, making it difficult for enterprises to make breakthroughs in improving the quality of finished meal and leaching crude oil products and reducing the energy consumption cost of solvent recovery.