Process for removing wax and extracting tea seed oil by ice crystal method

Abstract

The invention discloses a process for extracting tea seed oil, which overcomes the defects of the traditional process, particularly relating to a process for removing wax and extracting tea seed oil by an ice crystal method. In the process for removing wax and extracting tea seed oil by an ice crystal method, a cutting type crushing operation is used instead of the traditional impacting type and rolling type crushing operations, thereby reducing husks, dregs and scraps mixed in tea kernels and improving the operability of downstream processes; spherical millets are used as fillings instead of tea seed husks or diatomite, thereby avoiding reducing the yield of the oil product as a result of the fact that the tea seed husks or the diatomite can absorb oil in the process; by condensing and stirring to remove water and wax from raw oil, the invention can avoid the volatilization of volatile fragrant substances in the tea seed oil caused by the traditional high-temperature vacuum / negative pressure pumping process and can reserve the natural flavor of the tea seed oil, thereby increasing the market value; and by using molecular distillation to separate free fatty acid from the raw oil, a special high-grade oil product for fine chemical industry or medical industry can be obtained.

Description

technical field [0001] The invention relates to a process method for extracting oil from camellia oleifera seeds, in particular to a process method for extracting camellia oleifera seed oil by removing wax by ice crystal method. technical background [0002] In the existing oil extraction process, the camellia oleifera seeds are first cleaned and shelled, including shell and kernel separation, flattening, frying, and then pressing and filtering. The oil extraction equipment used mainly includes hydraulic oil press and screw oil press. The existing oil extraction process uses these oil presses to press camellia oleifera seeds, and the residual oil rate in the cake is still relatively high, and some even reach 10 More than % [Zhong Xumei, Zhang Baigang, Zhu Jie, Comprehensive Utilization of Camellia Seeds in my country, Grain, Oil and Food Science and Technology, 2007, 15(2)]. [0003] Existing oil extraction process: [0004] ①Camellia oleifera seeds → roasting → crushing → ...

AI Technical Summary

Problems solved by technology

[0014] ① It is necessary to add shelling and kernel shell separation equipment;

[0015] ② After shelling, the tea seed kernels are very viscous, and are easy to stick to the roll when rolling;

[0016] ③ After shelling, the raw body is poorly scattered when frying, and it is easy to agglomerate, and it is easy to form uneven raw and cooked raw materials;

[0017] ④ Hullless tea seed kernel blanks have high plasticity and poor elasticity, which can easily lead to difficulty in feeding the press during pressing, difficulty in forming pressure in the press chamber, and easy slipping and locking of the material in the press chamber, making it difficult to press normally;

[0018] ⑤ The machine-pressed cake after shelling has poor permeability of solvent and mixed oil during leaching, which will easily lead to an increase in the residual oil of dry meal;

[0019] ⑥ After shelling, the wet meal is more likely to agglomerate in the dehulling machine, resulting in incomplete dehulling and difficult meal production

[0020] ⑦After shelling, the wet meal is more likely to agglomerate in the dehulling machine and has poor meal performance, which leads to blockage of the capillary pipeline for oil outlet. Even if the pressure of the press chamber increases, the oil is still difficult to exit the chamber

[0025] ① Due to the oil absorption of the shell residue, the oil yield is reduced;

[0026] ② Due to the dissolution of the pigment in the shell, the color of the oil is deepened, and the quality of the oil is low;

[0027] ③Because the husk residue remains in the meal, the quality and utilization value of the meal decrease;

[0028] ④ Due to the high hardness of shell slag, the wear and tear of machine parts and equipment maintenance costs will be increased;

[0029] ⑤ Due to the volume occupied by shell slag, the processing capacity of the equipment is reduced

[0057] In order to avoid volatilization of flavor substances caused by excessively high temperature, the existing technology adopts low-temperature pressing and a series of low-temperature operations. Tiny tea seed kernel fragments cause the oil to be turbid. In order to improve the clarity of the oil, it is usually necessary to use fine filtration. The fine filtration process uses a filter filter process to ensure that the cold-pressed oil is clear and transparent, but some small particles are still difficult to remove.

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