A method and equipment for continuous crystallization, crystal growth, dewaxing and refining to improve the quality of vegetable oil

Abstract

A method and equipment for improving quality of vegetable oil through continuous crystallization, crystal growing, and dewaxing refining are disclosed. Oil and grease dewaxing is performed through eight-stage staged cooling crystallization, six-stage constant-temperature crystal growing, and two-stage low-temperature filtration. Special crystallization and crystal growing devices are adopted, interferences of transmission on crystallization and crystal growing processes are effectively solved as a whole, the heat conduction efficiency is higher, crystal damage caused by a transmission device and relative movement in an oil and grease system is less, energy consumption is lower, crystal dispersibility is significantly improved, and aggregation effects of wax, esters and high-melting-point fat are better. The method and the equipment can further improve dewaxing, winterization and dewaxing effects in crystallization and crystal growing processes of wax-containing vegetable oil, prolong oil product refrigeration time to 60 h or above, improve flavor and quality of oil and make oil palatability good. The method and the equipment are suitable for corn oil, sunflower seed oil, soybean oil, rice bran oil, and the like, and are particularly suitable for corn oil, sunflower seed oil, and the like.

Description

technical field

[0001] The invention belongs to the technical field of food processing and vegetable oil refining, and specifically relates to a method and equipment for continuous crystallization, crystal growth, dewaxing and refining to improve the quality of vegetable oil. Background technique

[0002] In the existing waxy vegetable oil refining dewaxing, winterization, and degreasing processes, the oil needs to undergo a step-by-step cooling and crystallization process, and then undergo a crystal growth process, so that wax esters or saturated esters or solid fats with high melting points can be precipitated in the oil. And continue to gather and grow into "crystals", which is convenient for subsequent separation, so as to improve the antifreeze performance and palatability of the oil, so as to improve the flavor quality of the oil. In fact, "dewaxing" in a broad sense not only includes the aforementioned precipitation of waxy esters or saturated esters or solid fats wit...

Examples

Embodiment 1

[0085] A method for continuous crystallization, crystal growth, dewaxing and refining to improve the quality of vegetable oil, comprising the following steps:

[0086] Step 1, eight-stage cooling crystallization step by step

[0087] ① Control the temperature of the oil in the heat exchanger 1 from 105°C to 120°C to 30°C to 100°C, pump it into the buffer tank I2 to stir and temporarily store, the buffer tank I3 is an isothermal insulation tank for incoming materials, and the stirring speed is 100rpm / min - 1200rpm / min, add 0-3% of oil weight crystal / filter aid and / filter aid to the buffer tank I3.

[0088] ② Pump the vegetable oil in the buffer tank I2 into the eight-stage cooling dewaxing tank group A1 3, A2 4, A3 5, A4 6, A5 7, A6 8, A7 9, A8 10 in series, each level (tank) See Table 1 for the single oil tank capacity, control temperature range, stirring speed, nitrogen flux, and ventilation time interval control.

[0089] Table 1

[0090]

[0091] The temperature range...

Embodiment 2

[0105] The equipment used in the refining method includes a buffer tank I2, and the buffer tank I2 is connected with an eight-stage cooling dewaxing tank, wherein the eight-stage cooling dewaxing tank includes A1 3, A2 4, A3 5, A4 6 in series , A5 7, A6 8, A7 9, A8 The 10-level tanks are connected to the sixth-level constant temperature crystal growth tanks through the buffer tank II, and the six-level constant temperature crystal growth tanks include B1 12, B2 13, B3 14, B415, B5 16, B6 Grade 17 tank is connected to filter through buffer tank III.

[0106] The cooling dewaxing tank or constant temperature crystal growth tank (ie A1 3, A2 4, A3 5, A4 6, A5 7, A6 8, A7 9, A810, B1 12, B2 13, B3 14, B4 15, B5 16 or B6 17), the first structure is: including a tank body, a stirring motor 21 is arranged on the top of the tank body, and the slow stirring rate provided by the stirring motor 21 is adjustable by frequency conversion, and the speed can be adjusted from 1 rpm to 50 rpm, ...

Embodiment 3

[0127] A method for continuous crystallization, crystal growth, dewaxing and refining to improve vegetable oil quality, the difference from Example 1 is that

[0128] In step 1,

[0129] Control the temperature of the oil from 110°C to 60°C in the heat exchanger 1, pump it into the buffer tank I2 to stir and temporarily store, the buffer tank I3 is an isothermal insulation tank for incoming materials, the stirring speed is 800rpm / min, add oil to the buffer tank I3 1% by weight crystallization / drainage aid, crystal / drainage aid is diatomaceous earth.

[0130] Grease stays at each temperature (tank) for 2h-4h.

[0131] The eight-level temperature control is A1 3—>26°C, A2 4—24°C, A3 5—19°C, A4 6—15.5°C, A57—12.5°C, A6 8—10°C, A7 9—8°C, A8 10 -3~6℃.

[0132] Preferably, the ventilation intervals are as shown in Table 3:

[0133] table 3

[0134]

[0135] In step 2,

[0136] The stirring speed of the buffer tank II11 is 30rpm / min, and 1.5% of the oil weight is added to th...

technical field

[0001] The invention belongs to the technical field of food processing and vegetable oil refining, and specifically relates to a method and equipment for continuous crystallization, crystal growth, dewaxing and refining to improve the quality of vegetable oil. Background technique

[0002] In the existing waxy vegetable oil refining dewaxing, winterization, and degreasing processes, the oil needs to undergo a step-by-step cooling and crystallization process, and then undergo a crystal growth process, so that wax esters or saturated esters or solid fats with high melting points can be precipitated in the oil. And continue to gather and grow into "crystals", which is convenient for subsequent separation, so as to improve the antifreeze performance and palatability of the oil, so as to improve the flavor quality of the oil. In fact, "dewaxing" in a broad sense not only includes the aforementioned precipitation of waxy esters or saturated esters or solid fats wit...

Examples

Embodiment 1

[0085] A method for continuous crystallization, crystal growth, dewaxing and refining to improve the quality of vegetable oil, comprising the following steps:

[0086] Step 1, eight-stage cooling crystallization step by step

[0087] ① Control the temperature of the oil in the heat exchanger 1 from 105°C to 120°C to 30°C to 100°C, pump it into the buffer tank I2 to stir and temporarily store, the buffer tank I3 is an isothermal insulation tank for incoming materials, and the stirring speed is 100rpm / min - 1200rpm / min, add 0-3% of oil weight crystal / filter aid and / filter aid to the buffer tank I3.

[0088] ② Pump the vegetable oil in the buffer tank I2 into the eight-stage cooling dewaxing tank group A1 3, A2 4, A3 5, A4 6, A5 7, A6 8, A7 9, A8 10 in series, each level (tank) See Table 1 for the single oil tank capacity, control temperature range, stirring speed, nitrogen flux, and ventilation time interval control.

[0089] Table 1

[0090]

[0091] The temperature range...

Embodiment 2

[0105] The equipment used in the refining method includes a buffer tank I2, and the buffer tank I2 is connected with an eight-stage cooling dewaxing tank, wherein the eight-stage cooling dewaxing tank includes A1 3, A2 4, A3 5, A4 6 in series , A5 7, A6 8, A7 9, A8 The 10-level tanks are connected to the sixth-level constant temperature crystal growth tanks through the buffer tank II, and the six-level constant temperature crystal growth tanks include B1 12, B2 13, B3 14, B415, B5 16, B6 Grade 17 tank is connected to filter through buffer tank III.

[0106] The cooling dewaxing tank or constant temperature crystal growth tank (ie A1 3, A2 4, A3 5, A4 6, A5 7, A6 8, A7 9, A810, B1 12, B2 13, B3 14, B4 15, B5 16 or B6 17), the first structure is: including a tank body, a stirring motor 21 is arranged on the top of the tank body, and the slow stirring rate provided by the stirring motor 21 is adjustable by frequency conversion, and the speed can be adjusted from 1 rpm to 50 rpm, ...

Embodiment 3

[0127] A method for continuous crystallization, crystal growth, dewaxing and refining to improve vegetable oil quality, the difference from Example 1 is that

[0128] In step 1,

[0129] Control the temperature of the oil from 110°C to 60°C in the heat exchanger 1, pump it into the buffer tank I2 to stir and temporarily store, the buffer tank I3 is an isothermal insulation tank for incoming materials, the stirring speed is 800rpm / min, add oil to the buffer tank I3 1% by weight crystallization / drainage aid, crystal / drainage aid is diatomaceous earth.

[0130] Grease stays at each temperature (tank) for 2h-4h.

[0131] The eight-level temperature control is A1 3—>26°C, A2 4—24°C, A3 5—19°C, A4 6—15.5°C, A57—12.5°C, A6 8—10°C, A7 9—8°C, A8 10 -3~6℃.

[0132] Preferably, the ventilation intervals are as shown in Table 3:

[0133] table 3

[0134]

[0135] In step 2,

[0136] The stirring speed of the buffer tank II11 is 30rpm / min, and 1.5% of the oil weight is added to th...

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