Secondary decoloring method of animal and vegetable oil

Abstract

The invention relates to a secondary decoloring method of animal and vegetable oil. The secondary decoloring method comprises the following steps of a, mixing oil to be decolored and primarily used waste clay, and enabling a mixture to enter a decoloring tower for decoloring treatment; b, treating a material discharged in the step 1 with a primary filter to obtain primarily decolored oil and secondarily used waste clay, and treating the collected secondarily used waste clay according to a conventional waste treatment technology; c, mixing the primarily decolored oil obtained in the step b andnew clay, and enabling a mixture to enter the decoloring tower for decoloring treatment; d, treating a material discharged in the step c with a secondary filter to obtain secondarily decolored oil andprimarily used waste clay, enabling the primarily used waste clay to reflux to the step a for use; and e, treating the secondarily decolored oil obtained in the step d with a bag filter to obtain decolored oil. The secondary decoloring method of the animal and vegetable oil enables the secondary utilization ratio of waste clay to be increased, the waste clay and oil to be more fully mixed and theuse ratio of fresh clay to be lowered and belongs to the technical field of animal and vegetable oil decoloring.

Description

technical field [0001] The invention relates to the decolorization technology of animal and vegetable oils, in particular to a secondary decolorization method of animal and vegetable oils. Background technique [0002] The methods currently used for decolorization of animal and vegetable oils are: conventional decolorization process and pre-decolorization process. [0003] Conventional decolorization process: [0004] Conventional animal and vegetable oil decolorization process: After mixing fresh white clay and heated oil evenly, stay in the decolorization tower for a certain period of time at about 100-110°C under vacuum conditions, and then transport it to the filter through the filter feed pump for filtration and separation. After the filtration pressure of the filter reaches the set value, the steam pressure is introduced to discharge the oil in the filter. After the oil is emptied, the filter cake clay is blown dry by steam and discharged from the filter, where it is ...

AI Technical Summary

Problems solved by technology

Disadvantages of this process: the decolorization and adsorption function of waste clay is not fully utilized, and the utilization rate of waste clay is low

[0006] There is not much difference between the re-decolorization process technology equipment and the conventional process technology, except that there are slightly more filters. The process is: after the first driving, fresh clay and heated oil are mixed evenly, and then 100 in the decolorization tower under vacuum conditions. After staying at -110°C for a certain period of time, it is transported to the leaf filter by the filter feed pump for filtration and separation. When the filter reaches the set pressure, switch the oil to be decolorized to the spare filter to continue filtering. The oil to be decolorized Adjust to the filter that has been filled with clay, and use the filter cake to pre-decolorize the phospholipids, neutralized residual soap, and some pigments in the raw materials. After the decolorized oil passes through the filter filled with clay, the oil enters the oil clay mixing tank for pre-fresh After the filter pressure of the decolorized oil and the filter cake that has formed a filter cake reaches a certain value, switch to another filter filled with clay to filter, and the filter that has reached the filter pressure is passed into a certain steam pressure. The oil is emptied and the filter cake is blown dry, such as the conventional decolorization process: the filter cake is blown dry and then discharged from the filter, and concentrated for waste solid treatment; the advantage of this process: the phospholipids and soaps in the oil to be decolorized are decolorized by using the waste clay in the leaf filter. And part of a small amount of pigment adsorption, reduce the adsorption of soap and phospholipids by fresh clay, and increase the decolorization and adsorption function of fresh clay; Disadvantages: 1. Because the filter layer of waste clay has been formed, waste clay preferentially adsorbs soap or phospholipids, and it is easy to absorb in the filter layer close to the saturation of adsorption Further accumulation of soap or phospholipids on the surface will easily block the channel of the filter layer, further increase the filtration pressure and have to stop the filtration; 2. The waste clay cannot be evenly contacted with the fresh oil, so that the adsorption function cannot be fully exerted, and the efficiency is low

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