There are many types of oil and dewaxing methods such as conventional methods, volume methods, and surface active agents.

I. Conventional method

Conventional method depends on frozen crystals alone, and then use mechanical methods to separate oil and wax without any auxiliary and auxiliary means.During separation, compression filtration, vacuum filtration and centrifugal separation are used.This method is simply a crystallization and filtering method.For example, the deodorized rice bran oil (temperature above 50 ° C) is moved into a storage tank with cooling device, stirred slowly, and sufficient cold under normal pressure to 25 ° C.The entire cooling crystallization time is 48HR, and then filter separation oil and wax.The filtration pressure is maintained at 0.3 – 0.35MPa. After filtering, it should be used to blow out the fat in the wax with compressed air after filtering.

Due to the low temperature dehydration temperature and large viscosity, it is difficult to separate, so the oil -containing oil -containing oil content of rice bran oil usually uses two crystalline filtration methods, and the deodorizing oil is fully cold in the cooling tank to 30 ° C.The cooling crystallization time is 24HR. The oil filter is filtered for the first time to remove most of the waxy quality. The filter pressure does not exceed 0.35MPa.The filtered oil enters the second cooling tank and continues to pass to low temperature cold water to reduce the temperature of the oil to below 25 ° C. After 24HR, the second filtration is performed. The filtered oil is dehydrated oil.After two filtering, the wax content (represented by acetone insoluble) in the oil is below 0.03%.Some companies can also achieve good dewaxing effects with cloth bag filtration, but the rate of cloth filtering is slow and the labor intensity is also large.It is shown in Figure 7-1.

cooling crystals → cloth bag filtration → dewaxing oil

wax paste → squeezing → coarse wax

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Process

Cooling crystals are performed in the cooling room. The room temperature is 0-4 ° C, and the oil is given to the cooling tank of the insulated layer at about 70 ° C. The cooling time is 72HR, and the temperature of the cooling tank is 6-10 ° C.The cooling speed starts within 24 hr, with an average of 2 ° C/h; the following 24HR is 0.5 ° C/h, and the total drop temperature of 24HR after 蕞 is about 1-2 ° C.The cloth bag filtration is performed in the filter room, the room temperature is maintained at 15-18 ° C, the filtration time is 10-12HR, the cloth bag can be made of polyester card, vitamin or cotton cloth.EssenceWhen the filtering oil is performed at 0 ° C freezing test, more than 2HR is transparent and clear, and the wax content in the dewaxing oil is below dozens of mg/kg.The intensity order of the filter medium to withstand the frozen test is, cotton \u0026 gt; Vitamin \u0026 gt; polyester card.

((15 %-17 %of the total oil volume) pour into the melting cooker and heat it to 35-40 ° C. Put the bag in the bag.5MPa, light pressure, frequent pressure, and not running wax paste during operation, and the squeezing time is 12 HR.About 61%separated from squeezing, and about 39%of rough waxes.40%-45%of oil in thick wax.

At present, most of the domestic oil plants are separated from oil and wax paste with plate -type filter after cooling and crystallization.Some small factories are filtered with cloth bags. Due to the limitations of conditions, the cooling and crystallization temperature and time cannot be controlled like the above requirements.Oil, cooled from above 50 ° C to 10-15 ° C within 2 days, and then used compressed air to send the oil to the oil filter.The divided oil contains below dozens of mg/kg.Generally speaking, the use of conventional methods is simple, the investment is easy, and the operation is easy, but the oil -wax is incomplete.

oil and dewaxing method, including conventional methods, volume methods, and surface active agent methods. I. Conventional method Conventional method depends on frozen crystals alone, and then use mechanical methods to separate oil and wax without any auxiliary and auxiliary means.During separation, compression filtration, vacuum filtration and centrifugal separation are used.This method is simply a crystallization and filtering method.For example, the deodorized rice bran oil (temperature above 50 ° C) is moved into a storage tank with cooling device, stirred slowly, and sufficient cold under normal pressure to 25 ° C.The entire cooling crystallization time is 48HR, and then filter separation oil and wax.The filtration pressure is maintained at 0.3 – 0.35MPa. After filtering, it should be used to blow out the fat in the wax with compressed air after filtering. Due to the low temperature dehydration temperature and large viscosity, it is difficult to separate, so the oil -containing oil -containing oil content of rice bran oil usually uses two crystalline filtration methods, and the deodorizing oil is fully cold in the cooling tank to 30 ° C.The cooling crystallization time is 24HR. The oil filter is filtered for the first time to remove most of the waxy quality. The filter pressure does not exceed 0.35MPa.The filtered oil enters the second cooling tank and continues to pass to low temperature cold water to reduce the temperature of the oil to below 25 ° C. After 24HR, the second filtration is performed. The filtered oil is dehydrated oil.After two filtering, the wax content (represented by acetone insoluble) in the oil is below 0.03%.Some companies can also achieve good dewaxing effects with cloth bag filtration, but the rate of cloth filtering is slow and the labor intensity is also large.It is shown in Figure 7-1. cooling crystals → cloth bag filtration → dewaxing oil wax paste → squeezing → coarse wax ↓ ↓ ↓ Process Cooling crystals are performed in the cooling room. The room temperature is 0-4 ° C, and the oil is given to the cooling tank of the insulated layer at about 70 ° C. The cooling time is 72HR, and the temperature of the cooling tank is 6-10 ° C.The cooling speed starts within 24 hr, with an average of 2 ° C/h; the following 24HR is 0.5 ° C/h, and the total drop temperature of 24HR after 蕞 is about 1-2 ° C.The cloth bag filtration is performed in the filter room, the room temperature is maintained at 15-18 ° C, the filtration time is 10-12HR, the cloth bag can be made of polyester card, vitamin or cotton cloth.EssenceWhen the filtering oil is performed at 0 ° C freezing test, more than 2HR is transparent and clear, and the wax content in the dewaxing oil is below dozens of mg/kg.The intensity order of the filter medium to withstand the frozen test is, cotton \u0026 gt; Vitamin \u0026 gt; polyester card. ((15 %-17 %of the total oil volume) pour into the melting cooker and heat it to 35-40 ° C. Put the bag in the bag.5MPa, light pressure, frequent pressure, and not running wax paste during operation, and the squeezing time is 12 HR.About 61%separated from squeezing, and about 39%of rough waxes.40%-45%of oil in thick wax. At present, most of the domestic oil plants are separated from oil and wax paste with plate -type filter after cooling and crystallization.Some small factories are filtered with cloth bags. Due to the limitations of conditions, the cooling and crystallization temperature and time cannot be controlled like the above requirements.Oil, cooled from above 50 ° C to 10-15 ° C within 2 days, and then used compressed air to send the oil to the oil filter.The divided oil contains below dozens of mg/kg.Generally speaking, the use of conventional methods is simple, the investment is easy, and the operation is easy, but the oil -wax is incomplete.