CN102766524B

CN102766524B - Method for squeezing edible tea seed oil at normal temperature

Info

Publication number: CN102766524B
Application number: CN 201210247045
Authority: CN
Inventors: 魏柱银; 陈同铸; 窦维祥; 郝中存
Original assignee: ANHUI HUAYIN CAMELLIA OIL Co Ltd
Current assignee: ANHUI HUAYIN CAMELLIA OIL Co Ltd
Priority date: 2012-07-17
Filing date: 2012-07-17
Publication date: 2013-12-25
Anticipated expiration: 2032-07-17
Also published as: CN102766524A

Abstract

本发明提供了一种食用茶叶籽油的常温压榨方法，包括茶叶籽常温晒干、籽壳分离、常温挤压压榨、毛油精制等步骤，精制时（1）首先毛油过滤除杂；（2）混合酸化水洗，脱胶处理；（3）混合脱色剂脱色；（4）静置毛油，分离去除油中的水分和杂质；然后再将除杂毛油进行真空下常温脱水；（5）将除水毛油在5℃下静置，结晶、养晶48h，析出油中的蜡质和酯质并分离；（6）将除晶后茶叶籽油进行隔膜压滤，得到精制茶叶籽油。本发明工艺是在不高于65℃的条件下进行的，工艺简单，能耗低，出油率高，榨出的油茶品质好，属于绿色环保工艺。The invention provides a method for pressing edible tea seed oil at room temperature, which includes the steps of drying tea seeds at room temperature, separating seed shells, squeezing and pressing at room temperature, and refining crude oil. During refining (1) firstly, the crude oil is filtered to remove impurities; 2) Mixed acidified water washing, degumming treatment; (3) Mixed decolorizing agent for decolorization; (4) Let the crude oil stand still, separate and remove the moisture and impurities in the oil; and then dehydrate the impurity-removed crude oil at room temperature under vacuum; (5) Stand the dehydrated crude oil at 5°C, crystallize and grow crystals for 48 hours, and separate the waxes and esters in the oil; (6) Filter the tea seed oil after decrystallization to obtain refined tea seed oil . The process of the invention is carried out under the condition of not higher than 65 DEG C, the process is simple, the energy consumption is low, the oil yield is high, and the quality of the pressed camellia oleifera is good, which belongs to the green environmental protection process.

Description

A kind of normal temperature pressing method of edible tea seed oil

Technical field

The invention belongs to the grease manufacture field, specifically a kind of processing technology of tea seed oil.

Background technology

Within 2009, Ministry of Health's approval tea seed oil is new resource food.But current in high-quality tea seed oil is produced owing to there being a series of technical bottleneck problems, this resources advantage fails really to be converted into economic advantages.Research and solve the key technical problem in high quality tea oil production, become oil prodution industry development institute and be badly in need of.

The tea seed oil unsaturated fatty acid content surpasses sweet oil, reaches more than 83%, and content of vitamin E is high, particularly is rich in tea-polyphenol, is the extremely abundant edible oil of a kind of nutritive value, is described as " the top nutritional oil in east ".

Current, the subject matter that the high-quality tea seed oil production of China exists is: the tea seed oil that the hot moulding method is produced easily makes natural nutrient component in tea seed oil, active substance and intrinsic loss of aroma, make the tea seed oil color dark, must carry out further refining processing, energy consumption is large.The normal temperature milling process is produced tea seed oil, shelling and separation of hull from kernel difficulty, and after shelling, tea-seed benevolence oil length is high, and the pressurization difficulty, easily tie thorax, and common oil press zhai can't run well.There are the problems such as energy consumption is large, oil quality is unstable in refining procedure.The tea-seed source is numerous in variety, and composition and active ingredient difference are large, and the standardized production technology is urgently set up.

Summary of the invention

The purpose of this invention is to provide a kind of normal temperature pressing method of edible tea seed oil, operational path is reasonable, and oil yield is high, and oil quality is high.

Technical scheme of the present invention is as follows:

A kind of normal temperature pressing method of edible tea seed oil comprises the following steps:

(1) tea-seed dries, and the tea-seed that purchase is come screens immediately, under the sun, dries, and after tea seed water ratio is down to 10%, is removed the tea-seed shell, and seed benevolence is ground into 50-80 order flour;

(2) the seed benevolence powder after the pulverizing carries out the normal temperature squeezing, the crude oil of squeezing out;

(3) under normal pressure by above-mentioned squeeze out crude oil filtration, the filter screen cleaning collected, drag for the operation of slag deslagging continuous circulation, multi-filtering;

(4) pickling, washing add 50% citric acid and the 80% phosphoric acid mixing acid that account for oil-tea camellia seed crude oil gross weight 0.01-0.015% to enter in the crude oil after removing slag, then add and account for the hot water that oil-tea camellia seed crude oil gross weight 5-6%, temperature are 55-65 ℃, enter together in static mixer fully and mix, then enter in the washing whizzer and come unstuck;

(5) add the mixture of come unstuck crude oil weight 2-4% activated carbon and 1-3% carclazyte, fully stir decolouring;

(6) standing crude oil, the crude oil after above-mentioned decolouring is heated to 55-60 ℃ of insulation, and the standing 60-72 hour of constant temperature, separates moisture and the impurity removed in oil;

(7) and then by removal of impurities crude oil normal temperature dewatering 2-3h under 55-60 ℃, 720mmHg vacuum, remove below water content in oil to 0.1%;

(8) crude oil that will dewater is standing under 5 ℃, passes into ozone, and crystallization, growing the grain 48h separate out wax in oil with ester matter and separate;

(9) will carry out the barrier film press filtration except tea seed oil after brilliant, operating pressure 0.3Mpa, remove wax and ester matter in oil, obtains refining tea seed oil.

Described normal temperature extruding squeezing refers to extruding squeezing at normal temperatures, mixes the grouts of 5-8% during squeezing in tea-seed benevolence.

The grouts that contain a small amount of oil after described normal temperature extruding squeezing, be mixed into defibrination in the aqueous ethanolic solution of 65-75%, and carry out ultrasonic helping after defibrination and carry, and then standing, tea oil floats over upper strata, isolates tea oil.

The present invention adopts normal temperature naturally to dry, and tea-seed is down to 10% left and right very soon through screening, tea seed water ratio.Tea-seed after drying can meet the requirement of postchannel process, and can reduce and go mouldy, and is conducive to standing storage.And traditional a heatable brick bed room drying process floor space is large, temperature is high, labour intensity is large, and after tea seed absorption cigarette vapour, contaminated quality descends, and especially sanitary index benzopyrene content raises.

Squeezing after the present invention adopts tea-seed benevolence shell to separate, be conducive to improve oil yield.

Grouts after the present invention will squeeze last time are incorporated in tea-seed and squeeze, and can increase the gap between tea-seed squeezing afterwards, are conducive to oozing out of oil, can improve 2% oil yield.

The oil that also contains 5-6% in grouts in prior art after squeezing, the common organic solvents extraction, exist and pollute, reduced fuel-displaced grade, the present invention adopts the aqueous ethanolic solution defibrination, ultrasonic helping carried, can effectively the oil immersion in grouts be gone out, the oil immersion in grouts can be gone out more than 90%, the oil simultaneously leached is pollution-free, grade is high, has increased income.Defibrination in the aqueous ethanolic solution of 65-75%, oil yield is the highest.

Process for refining of the present invention, employing adds 50% citric acid and the 80% phosphoric acid mixing acid that account for oil-tea camellia seed crude oil gross weight 0.01-0.015% to carry out pickling, washing in the crude oil removed slag, then add and account for the hot water that oil-tea camellia seed crude oil gross weight 5-6%, temperature are 50-60 ℃, carry out centrifugal coming unstuck; Adopt the mixture decolouring of gac and white powder, good decolorizing effect, decolorizing efficiency is high, adopts 50-60 ℃, the 72 hours standing technology of constant temperature, removes moisture and impurity in oil.Adopt 55-60 ℃, the normal temperature dewatering technology of 2-3h, 720mmHg vacuum, remove below water content in oil to 0.1%.Adopt 5 ℃, the normal temperature winterization technology of 48h crystallization, growing the grain, separate out wax and ester matter in oil, and adopt the barrier film pressure filtering technique, remove wax and ester matter in oil.The processing condition gentleness, do not have organic solvent to mix, and can guarantee the quality of grease.

Table 1 the lipid acid of tea seed oil and tea oil forms contrast

Embodiment

implement 1

A kind of normal temperature pressing method of edible tea seed oil, concrete operations are as follows:

(6) standing crude oil, the crude oil after above-mentioned decolouring is heated to 56 ℃ of insulations, and standing 72 hours of constant temperature, separates moisture and the impurity removed in oil;

(7) and then by removal of impurities crude oil normal temperature dewatering 3h under 60 ℃, 720mmHg vacuum, remove below water content in oil to 0.1%;

(8) crude oil that will dewater is standing under 5 ℃, passes into ozone, oxidation impurities, and crystallization, growing the grain 48h, separate out wax in oil with ester matter and separate;

embodiment 2

A kind of normal temperature pressing method of edible tea seed oil, main working method is with embodiment 1, and different places are to mix the grouts of 5-8% when squeezing in tea-seed benevolence, and squeezing, improved oil yield 2% together.

embodiment 3

A kind of normal temperature pressing method of edible tea seed oil, main working method is with embodiment 1, different places are to have increased the grouts refining process, specific practice is that grouts after normal temperature squeezing are mixed into to defibrination in 70% aqueous ethanolic solution, standing after defibrination, tea oil floats over upper strata, isolates tea oil, isolated tea oil turns back to vacuum dewatering technique, carries out conventional subsequent disposal.

Claims

1. a normal temperature pressing method of edible tea seed oil, is characterized in that, comprises the following steps:

(1) Tea seeds are dried in the sun, and the purchased tea seeds are immediately screened and dried in the sun. When the moisture content of the tea seeds drops to 10%, the shells are removed, and the seeds are crushed into 50-80 mesh powder;

(2) The crushed seed powder is pressed at room temperature to extract crude oil;

(3) Under normal pressure, filter the above-mentioned squeezed and collected crude oil, clean the filter screen, remove slag and discharge slag in a continuous cycle, and perform multiple filtrations;

(4) Pickling and water washing Add 50% citric acid and 80% phosphoric acid mixed acid accounting for 0.01-0.015% of the total weight of camellia seed crude oil into the crude oil after deslagging, and then add 5-5% of the total weight of camellia seed crude oil 6%, hot water at a temperature of 55-65°C, put them into the static mixer and mix them thoroughly, and then put them into the washing centrifuge for degumming;

(5) Add a mixture of 2-4% activated carbon and 1-3% white clay by weight of degummed crude oil, and fully stir for decolorization;

Put the crude oil still, heat the decolorized crude oil to 55-60°C and keep it warm, and let it stand at a constant temperature for 60-72 hours to separate and remove the water and impurities in the oil;

(6) Then dehydrate the impurity-removing crude oil at room temperature for 2-3 hours at 55-60°C and 720mmHg vacuum, and remove the moisture in the oil to less than 0.1%;

(7) Let the dehydrated crude oil stand at 5°C, pass through ozone, crystallize and grow crystals for 48 hours, and separate the waxes and esters in the oil;

(8) The tea seed oil after decrystallization is subjected to membrane pressure filtration, the working pressure is 0.3Mpa, the wax and ester in the oil are removed, and refined tea seed oil is obtained;

The normal temperature pressing refers to extrusion pressing at normal temperature, and 5-8% cake is mixed into the tea seed kernel during pressing;

Cakes containing a small amount of oil after being extruded at room temperature are mixed into 65-75% ethanol aqueous solution to refine. After refining, ultrasonic extraction is carried out, and then stand still. The tea oil floats on the upper layer and the tea oil is separated.