CN102517142A - Zero trans-fatty acid multi-vitamin first-grade soybean oil and preparation method thereof - Google Patents
Zero trans-fatty acid multi-vitamin first-grade soybean oil and preparation method thereof Download PDFInfo
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Abstract
The invention provides zero trans-fatty acid multi-vitamin first-grade soybean oil and a preparation method thereof. The zero trans-fatty acid multi-vitamin first-grade soybean oil is produced by screening of soybean raw materials, a soybean peeling and instantaneous high-pressure wet-hot enzyme inactivation technology, a double-enzyme degumming/ super degumming and washing-free long-time mixing and de-acidifying coupling technology, a two-step decolorization technology with low-activity decolorizing agent, a low-temperature short-time/ two-stage catching, refluxing and deodorization technology, a ''nitrogen charging fresh-keeping'' technology and the like. In the zero trans-fatty acid multi-vitamin first-grade soybean oil, the trans-fatty acid content is less than or equal to 0.5 percent, the natural vitamin E content is more than or equal to 1,200ppm, the plant sterol content is more than or equal to 2,200ppm, and the squalene content is more than or equal to 60ppm; the soybean oil is packed by charging nitrogen, and any chemically synthesized antioxidant is not added; and compared with the commercially available first-grade soybean oil, the soybean oil is more safe, nutritional and healthy.
Description
Technical field
The present invention relates to the edible oil manufacture field, especially relate to a kind of processing of zero trans-fat acid multidimensional one-stage VT 18.
Background technology
Along with the innovation of VT 18 processing technology and the raising of refined, conventional quality problems have obtained solution basically in recent years, but its security-hidden trouble still exists.This be because; On the one hand; Content of polyunsaturated fatty acid is higher in the VT 18, unsafe factor such as it is prone to oxidative rancidity, returns the look aftertaste in processing, storage and the process of circulation, shelf-lives shortening, on the other hand; The excessive processing phenomenon that existing general VT 18 production technique exists is outstanding, brings variety of problems and hidden danger.
The excessive processing of VT 18 especially is embodied in the overrefinement; Promptly in refining process ubiquity to add alkali number big; Carclazyte addition many (tons oil use carclazytes 10～20 kilograms), deodorization temperature high (240～260 ℃ even higher), the long (situation such as 2～3h) of deodorization time.Overrefinement not only causes resource and energy dissipation; The aggravation environmental pollution increases the grease loss, and has removed the natural most useful micro-nutrients that is present in the VT 18; The loss of nutrient substances such as aggravation vitamin E, plant sterol, Supraene; And unavoidably produce new objectionable impurities (like trans fatty acid, glyceryl ester polymkeric substance etc.), seriously reduced nutrition, the security quality of VT 18 thus, and the food-safety problem that makes new advances of association.
These problems that the excessive processing of VT 18 brings, and the disadvantageous effect that the consumer health causes can not be ignored.
With the trans fatty acid is example; According to investigations, the trans fatty acid intake is generally far below U.S. 5.8g/ per capita days per capita in China, but general long-term edible very high salad oil, the height of refined of China city resident cooked oil; It is also more and more general to eat the food that contains the hydrogenation vegetables oil; Fried food more common people is liked, especially white collar and children, and the tendency of its diet western-style foodization is obvious day by day; The trans fatty acid condition with higher of ingesting outwardness has caused certain harm to its physical and mental health.The end of the year 2010; Domestic authoritative medium have caused social extensive concern and strong repercussion about the relevant report of " trans fatty acid hazardness is greater than 666 "; Some Safety of edible oil are under suspicion; Ordinary consumer is panic, and China's grease and food service industry have been produced great effect, and this fully demonstrates New Development, popularity and seriousness that public health emergency exerted an influence.The control of trans fatty acid has now become the focus that whole oils industry is paid close attention to, and the trans fatty acid level in the large oil product of research control soybean wet goods accomplishes to check on from the source as early as possible, is very important.Law-making stipulation is made to trans fatty acid by present American-European major country, and the content of trans fatty acid has become the part of most of in the world advanced countries codex alimentarius system in the limit food product.China also assesses the trans fatty acid level in the fatty foods, and it is imperative that next step formulates limit standard.
The content that improves fatty accompaniments such as naturally occurring vitamin E, sterol and Supraene in the VT 18 has important health and is worth.These compositions have excellent antioxidant effect in vivo and other physiological functions; The U.S. food and the nutrition council (FNB) and Chinese Soclety of Nutrition's suggestion per day for adults should be taken in 15mg left and right sides alpha-tocopherol; (the sterol amount of from normal diet, absorbing everyone every day is merely 0.4～0.5g) to minimum absorption 0.8g plant sterol, to reduce the sick danger of cardiac trigger.Calculate according to taking in the 30g grease every day of Chinese Soclety of Nutrition's recommendation; If content of vitamin E reaches 1200mg/kg in the VT 18; Sterol reaches 2200mg/kg, and 6.1mg alpha-tocopherol and 66mg plant sterol can be provided, and alleviates the shortage situation of compatriots to these micro-nutrientss greatly.Research shows; Overrefinement is the key step that causes loss such as vitamin E, sterol in the VT 18; Dimension E loss during alkali refining in the soya-bean oil can reach 20%; Carry the sterol loss that causes secretly by soap stock and can reach 17%, decolouring can cause tieing up E loss about 10%, and deodorization makes and ties up E 20% or more and sterol is lost.
Summary of the invention
The purpose of this invention is to provide a kind of zero trans-fat acid multidimensional one-stage VT 18 and preparation method thereof; Through the damp and hot enzymatic inactivation technology of soy material triage techniques, defilming soybean-instantaneous high pressure, two enzymes come unstuck/super coming unstuck-does not have washing long mix depickling coupling technique, low activity discoloring agent two-step bleaching technology, low temperature in short-term two-stage capture the appropriateness processing that backflow deodorization technique, omnidistance automatic control online " nitrogen-charging fresh-keeping " technology of VT 18 etc. realize soybean, produce the sour multidimensional one-stage VT 18 of zero trans-fat.
A kind of zero trans-fat acid multidimensional one-stage VT 18, wherein: (according to the U.S. FDA regulation, content of trans fatty acids is lower than 0.5% to content of trans fatty acids≤0.5%; Can be labeled as zero trans-fat acid); Natural VE content>=1200ppm, plant sterol content>=2200ppm, Supraene content>=60ppm; Nitrogen-filled packaging does not add any chemosynthesis inhibitor.
Above-mentioned zero trans-fat acid multidimensional one-stage VT 18, preferred: content of trans fatty acids≤0.5% wherein; Natural VE content is 1200mg/kg～1600mg/kg; Plant sterol content is 2200mg/kg～3000mg/kg; Supraene content is 60mg/kg～120mg/kg; Free fatty acid content is 0.020%～0.060%.
A kind of preparation method of zero trans-fat acid multidimensional one-stage VT 18 may further comprise the steps:
(1) soy material screening: mould beans content is 0 in the soy material that detection control processing is used, green soya bean content＜2.0%;
Aspect the buying of soybean, storage, also to implement the principle of " having selected beans for use, the short-term storage ".
In the soybean buying, through contract engagement, limit transportation ship, control haul-cycle time and implement strictly, realize that first of raw materials quality heavily ensures to measures such as port trace routines; Through control soybean storage condition, regularly detect soybean storage situation and set up mould beans, green soya bean treatment measures, realize that second of raw materials quality heavily ensures, thereby set up the raw material quality control security mechanism.
(2) the damp and hot enzymatic inactivation of defilming soybean-instantaneous high pressure: be heated to 75-80 ℃ after the soybean removal of impurities and carry out modified; Modified good soybean carries out the fragmentation decortication, and the back soybean of peeling is at 55-65 ℃, and hydraulic pressure 60-85bar rolls into broken soybean the embryo sheet of 0.3-0.4mm and controls 55 ℃-70 ℃ of embryo sheet temperature, moisture 10-10.5% down; Subsequently the embryo sheet carry out expanded, WP 40-110Bar, directly vapour 3-6Kg/cm
2, indirect vapour 1-2Kg/cm
2, drop temperature is controlled at 105 ℃-125 ℃, uses the food grade normal hexane as solvent again after drying and the cooling, and extraction temperature 50-55 ℃ of turnover down, the mixing oil that obtains takes off the acquisition crude oil through filtration, steaming;
This step is to reduce the main purpose that forms of nonhydratable phosphatide with the passivation enzyme, through organic associating of modified technology, efficient defilming soybean technology, extruding and puffing technology, has formed the damp and hot enzymatic inactivation technology of defilming soybean-instantaneous high pressure.Damp and hot modified technology mainly be through control suitable hot blast temperature, quantity of steam etc. with the soybean moisture controlled at 9-10%; Efficient defilming soybean technology mainly is to realize soybean skin-containing rate≤4% through control soybean moisture, temperature and crusher parameter; Mainly through using international advanced expanded, cooling apparatus, control material pressure, moisture, temperature realize the expanded of material to extruding and puffing technology, have not only improved oil quality, and have improved factory's production capacity, have reduced power and steam energy consumption.
(3) two enzymes come unstuck or super coming unstuck-do not have, and washing is long mixes the depickling coupling:
A. two enzymes come unstuck: control crude oil temperature is 70～75 ℃, and according to the content of the nonhydratable phosphatide of raw oil, interpolation is 50% Hydrocerol A with elaeometer 0.04%, concentration; Acidifying 20～30min is cooled to 50～60 ℃ afterwards, adds the lye pH adjustment to 4.5 of concentration 40%; Add oil simultaneously and weigh 1.0～2.0% hot soft water, 20～50mg/kg phospholipase A and 100～300mg/kg Phospholipase C, mixed at high speed; Get into the enzyme reaction jar and keep 1.0～2.0h, be warming up to 85 ℃ of spinnings and go out grease;
The conventional phospholipase A (PLA) that adopts of enzymatic degumming, its product lysophospholipid good hydrophilic property of coming unstuck is easy to washing and removes, but consuming time long, brings difficulty to operate continuously, and lysophospholipid is removed with oil foot simultaneously.And the phosphorus oxygen key between Phospholipase C (PLC) ability specificity hydrolysis phosphate and the glyceryl generates triglyceride.Triglyceride is dissolved in a part that becomes edible oil in the oil.Therefore, adopt Phospholipase C to come unstuck, can realize physical refining, can improve the yield of degummed oil again.
For this reason; The present invention utilizes the characteristics separately of PLC, PLA, develops the two enzyme degumming technologies of Phospholipase C-phospholipase A, promptly adopts a small amount of PLA to carry out conventional enzymatic degumming operation earlier; Utilize lysophospholipid to be formed with to be beneficial to the emulsification system of follow-up PLC effect, then add an amount of PLC and implement to come unstuck operation.
Or b. control crude oil temperature is 60～70 ℃; Add Hydrocerol A and cool to 40～45 ℃ of acidifying 15-20min; Add then that oil weighs that 1～2% soft water and oil weigh 1～3%, concentration is 2～3% flocculation agent, be warmed up to 85～85 ℃ behind the thorough mixing and carry out aquation, hydration time 20-30min; Spinning afterwards gets degummed oil; The temperature of controlling degummed oil again is 75 ℃, and heavy 0.02%～0.04% the concentration of refueling is 75% phosphoric acid, carries out 10～15min reaction; With behind oily temperature drop to 40～45 ℃, add concentration and be 10～14% alkali lye and carry out alkali-refining deacidification reaction 30～45min, oil must neutralize after the spinning; The oil that will neutralize again carries out drying, and dehydrated oil adds 0.1%～0.2% zeyssatite, at vacuum-0.085Mpa; Mix 20min under the condition that temperature is 100～105 ℃, filter to isolate grease;
Nonhydratable phosphatide is converted into hydrated phospholipid, and transformation efficiency reaches more than 98%,
Super coming unstuck mainly is that adding through Hydrocerol A is converted into hydrated phospholipid with nonhydratable phosphatide, through the aquation flocculation reaction phosphatide removed, thereby realized that phosphorus content is reduced to below the 30ppm.Degummed oil is grown mixed depickling subsequently.Traditional alkali-refining deacidification Technology Need adds water to be washed except that soap, produces great amount of wastewater, and waste water can also be carried 0.2%～1% neutral oil secretly, causes the refining loss.For reducing wastewater discharge, reduce cost, the present invention uses does not have the long deacidifying process that mixes of washing, promptly the neutralization oil after whizzer separates is not washed, but after dry adding zeyssatite to oil in residual soap carry out adsorbing and removing, then get into bleaching workshop section.
(4) low activity discoloring agent two-step bleaching: with isolating to such an extent that grease carries out drying at 100-105 ℃ in the step 3); It is decoloured through filling up the filter that has passed through the useless white rabbit of once decolouring in advance; Re-add the carclazyte of 4-8kg/T oil then according to oil, mix the back vacuum tightness-0.08～-the 0.09Mpa condition under, decolouring 20-30min; Filter carclazyte, get bleached oil;
Carclazyte decolours to VT 18, and to improving oil quality, improve grease stability and have vital role, be the important leverage that reduces oil peroxidation value, phospholipids content, metal ion content, saponified matter content.For VT 18, no matter be to investigate percent of decolourization, or filtration velocity, carclazyte has with the obvious advantage as sorbent material.
In view of a discoloring clay still has certain adsorption activity; In order to reduce the discoloring clay consumption, reduce the absorption of sorbent material, before decolouring to oil; Neutralization oil is decoloured through the filter that fills up a discoloring clay in advance; Remove partial impurities and pigments such as soap, phosphorus, and then carry out the routine decolouring, can the discoloring agent addition be reduced to 4～6kg/t oil by 8～10kg/t oil like this.
(5) low temperature deodorization in short-term: the vegetables oil after will decolouring to 165-185 ℃, is sent oil into tray column through deaerator deoxygenation post-heating then, through high-temperature steam oil is heated to 205-235 ℃; The open steam stripping carried out the temperature-sensitive decolouring in 10-15 minute; Then oil is sent into packing tower, keep 205-235 ℃ temperature 5-8min to slough lipid acid, get into tray column afterwards again and stopped 10-20 minute; At last oil cooling is carried out the essence filter after 35-45 ℃, get deodorised oil;
Preferably carry out the two-stage capture simultaneously in the deodorising process in short-term at above-mentioned low temperature: promptly collect the two-stage overhead product of deodorization distillate, first step cut comprises VE and sterol, and capturing temperature is 130-150 ℃; Second stage cut comprises lipid acid, and capturing temperature is 40～100 ℃; First step cut joins in the deodorised oil or again through joining in the deodorised oil again after at least once the deodorization circulation again;
The present invention takes corresponding measure in deodorization procedures, mainly is to reduce to stir steam consumption and deodorization temperature, improves the deodorization tower structure, reduces the loss of greasy oxidation and natural antioxidants as far as possible.Two deodorization distillate traps are set simultaneously,, VE, sterol and lipid acid are captured respectively, and the overhead product that will be rich in VE, sterol is transported to deodorization tower layer second from the bottom again, to reduce the loss of beneficiating ingredient through controlling the differing temps of two traps.
(6) nitrogen-charging fresh-keeping.
Nitrogen-charging fresh-keeping is to send jar with refining oil, in jar, fills nitrogen again, makes its concentration reach 85-90%.It can reduce the deodorization processed oil to greatest extent and contact secluding air protection grease with air.Both guaranteed higher nitrogen gas concn, and again tank body had not been produced damage and causes security incident.Ensure grease stablizing between the storage delivery period.
Multidimensional one-stage soybean refining oil among the present invention is carried out index detect, the result is following: vitamin e1 200mg/kg～1600mg/kg; Plant sterol 2200mg/kg～3000mg/kg; Supraene content 60mg/kg～120mg/kg; Trans fatty acid≤0.5%; Free fatty acid content 0.020%-0.060%; Color and luster (133.4mm cell) is Y8-15, R0.3-1.2.
The beneficial effect of technical scheme of the present invention:
Zero trans-fat among the present invention acid multidimensional one-stage VT 18 is compared with present commercially available one-level VT 18, and its content of trans fatty acids is low, and vitamin E, plant sterol, Supraene content are high, safer, nutrition, health.
The preparation method of the zero trans-fat acid multidimensional one-stage VT 18 among the present invention; It has contained that raw material screening, soy material pre-treatment, VT 18 are produced, VT 18 refining and VT 18 store each links of processing such as circulation; Through to the smart control of soyabean processing whole process and each technological coupling, innovation; The height that has obtained useful nutrient substance keeps, and reduces to greatest extent simultaneously or removes noxious (like trans fatty acid etc.), has effectively improved the quality of VT 18.
In addition, this method also realizes refining yield is improved more than 0.5%, and the ton of soyabean processing dissolves consumption and reduces by 11%, and the ton steam consumption reduces by 14%, and the ton power consumption reduces by 5%, and the discoloring agent consumption reduces 38%, and soft water consumption reduces by 70%.Save energy, economic environmental protection.
Embodiment
For further specifying the present invention, specify in conjunction with following examples:
Embodiment 1:
Select for use quality better, colloid, free fatty acid content be lower, the U.S. soybean that is easy to carry out VT 18 processing detects simultaneously that mould beans content is 0 in the soy material that the processing of control VT 18 appropriateness uses, green soya bean content 1.2%.
The soybean that silo comes gets into full beans well heater after cylinder magnetic separator, soybean cleaning sieve, the removal of impurities of soybean fly-ash separator.The control soybean residence time is 30min, and soybean is heated to 75 ℃, and heating steam pressure 1.0bar accomplishes the modified of soybean.Modified good soybean gets into one crusher and two road crushers carry out the fragmentation decortication; Decortication back soybean gets into flaker, at 60 ℃, will broken soybean under the hydraulic pressure 70bar condition rolls into the embryo sheet of 0.35mm; And 60 ℃ of control embryo sheet temperature, moisture 10%.The embryo sheet gets into bulking machine subsequently, WP 60Bar, directly vapour 5Kg/cm
2, indirect vapour 2Kg/cm
2, drop temperature is controlled at 115 ℃, carries out drying and cooling then, makes expanded material reach enough hardness, is convenient to carry.Select for use the food grade normal hexane as solvent again, 55 ℃ of control extraction temperatures, leaching back mixing oil takes off (65 ℃, vacuum) through filtration, steaming and obtains crude oil.
Crude oil after the filtration is heated to 72 ℃ through heat exchange, and interpolation 0.04% (with elaeometer) concentration is 50% Hydrocerol A, at souring tank reaction 20min; Be cooled to 60 ℃, add the lye pH adjustment to 4.5 of concentration 40%, add oil simultaneously and weigh 1.5% hot soft water; 30mg/kg phospholipase A and 150mg/kg Phospholipase C; Mixed at high speed gets into the enzyme reaction jar and keeps 1.5h, is warming up to 85 ℃ of spinnings and goes out grease.
Two enzyme degummed oils are carried out drying at 105 ℃, decolour in advance through the filter of useless carclazyte that fills up through once decolouring, the carclazyte that re-adds about 5kg/T oil according to oil then mixes; Under vacuum tightness-0.09Mpa condition; Decolouring 25min filters carclazyte, gets bleached oil.
Vegetables oil after the decolouring through deaerator deoxygenation post-heating to 185 ℃, is sent into tray column, oil is heated to 235 ℃ through steam; The open steam stripping carried out the temperature-sensitive decolouring in 10 minutes, got into packing tower then, kept 235 ℃ of temperature; Stopped 5 minutes, and sloughed lipid acid, get into tray column afterwards again and stopped 15 minutes; At last with carrying out the essence filter behind the oil cooling to 40 ℃, deodorised oil.For reducing the beneficiating ingredient loss as far as possible, two deodorization distillate traps are set, first step cut comprises VE and sterol, and capturing temperature is 150 ℃; Second stage cut comprises lipid acid, and capturing temperature is 60 ℃; First step cut joins in the deodorised oil.
Send jar with refining oil, again in jar towards nitrogen, make a jar interior nitrogen gas concn reach 85%, both guaranteed higher nitrogen gas concn, again tank body is not produced and damages and cause security incident.
Refining oil is carried out index detect, the result is following: vitamin e1 360mg/kg; Plant sterol 2450mg/kg; Supraene content 70mg/kg; Trans fatty acid 32%; Free fatty acid content 0.042%; Color and luster (133.4mm cell) is Y10R0.6.
Embodiment 2:
Select for use quality better, colloid, free fatty acid content be lower, the U.S. soybean that is easy to carry out VT 18 processing detects simultaneously that mould beans content is 0 in the soy material that the processing of control VT 18 appropriateness uses, green soya bean content 1.0%.
The soybean that silo comes gets into full beans well heater after cylinder magnetic separator, soybean cleaning sieve, the removal of impurities of soybean fly-ash separator.The control soybean residence time is 35 minutes, and soybean is heated to 80 ℃, and heating steam pressure 1.2bar accomplishes the modified of soybean.Modified good soybean gets into one crusher and two road crushers carry out the fragmentation decortication; Decortication back soybean gets into flaker, at 65 ℃, will broken soybean under the hydraulic pressure 65bar condition rolls into the embryo sheet of 0.4mm; And control embryo sheet temperature is 55 ℃, moisture 10.5%.The embryo sheet gets into bulking machine subsequently, and WP is generally 50Bar, directly vapour 4Kg/cm
2, indirect vapour 1.5Kg/cm
2, drop temperature is controlled at 105 ℃, carries out drying and cooling then, makes expanded material reach enough hardness, is convenient to carry.Mass transport after expanded arrives leacher, selects for use the food grade normal hexane as solvent, 54 ℃ of control extraction temperatures, and leaching back mixing oil takes off (65 ℃, vacuum) through filtration, steaming and obtains crude oil.
Control crude oil temperature is 70 ℃, adds Hydrocerol A and cools to 45 ℃ of acidifying 20min, and nonhydratable phosphatide is converted into hydrated phospholipid; Transformation efficiency reaches more than 98%, adds then that oil weighs that 2% soft water and oil weigh 2%, concentration is 3% sodium hydroxide flocculation agent, through flash mixer; Oil, water, alkali are fully contacted, be warmed up to 85 ℃ and carry out aquation, control hydration time 25min; Spinning gets degummed oil.Degummed oil is controlled at 75 ℃ through interchanger, and heavy 0.02% the concentration of refueling is 75% phosphoric acid, carries out the 15min reaction, through heat exchange with oily temperature drop to 40 ℃; Then add concentration and be 12% alkali lye and carry out the reaction of 30min alkali-refining deacidification, spinning, oil must neutralize; The oil that will neutralize again carries out drying, and dehydrated oil gets into the zeyssatite mixing tank, adds 0.2% zeyssatite; At vacuum-0.085Mpa, mix 20min under 100 ℃ the condition, pump into the vane type filtration machine and filter to isolate grease.
Isolated grease makes it decolour in advance through filling up the filter that has passed through the useless carclazyte that once decolours earlier after 100 ℃ of following dryings, re-adds the carclazyte about 6kg/T oil according to oil then; Mix the back under vacuum tightness-0.08Mpa condition; Decolouring 20min filters carclazyte, gets bleached oil.
Vegetables oil deoxygenation with after the decolouring is heated to 165 ℃, gets into tray column; Through steam oil is heated to 205 ℃, the open steam stripping carried out the temperature-sensitive decolouring in 15 minutes, got into packing tower then; Keep 205 ℃ of temperature, stopped 8 minutes, slough lipid acid; Get into tray column afterwards again and stopped 20 minutes, carry out essence filter with behind the oil cooling to 45 ℃ at last, must deodorised oil.For reducing the beneficiating ingredient loss as far as possible, two deodorization distillate traps are set, first step cut comprises VE and sterol, and it is 130 ℃ that the first step captures temperature; Second stage cut comprises lipid acid, and it is 40 ℃ that the second stage captures temperature; First step cut joins in the deodorised oil through after twice of the deodorization circulation again again.
Send jar with refining oil, again in jar towards nitrogen, make a jar interior nitrogen gas concn reach 90%, both guaranteed higher nitrogen gas concn, again tank body is not produced and damages and cause security incident.
Refining oil is carried out index detect, the result is following: vitamin e1 360mg/kg; Plant sterol 2450mg/kg; Supraene content 70mg/kg; Trans fatty acid 32%; Free fatty acid content 0.038%; Color and luster (133.4mm cell) is Y12R0.8.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (9)
1. a zero trans-fat acid multidimensional one-stage VT 18 is characterized in that: content of trans fatty acids in the said VT 18≤0.5%, natural VE content>=1200ppm, plant sterol content>=2200ppm, Supraene content>=60ppm.
2. zero trans-fat acid multidimensional one-stage VT 18 according to claim 1 is characterized in that: content of trans fatty acids in the said VT 18≤0.5%; Natural VE content is 1200mg/kg～1600mg/kg; Plant sterol content is 2200mg/kg～3000mg/kg; Supraene content is 60mg/kg～120mg/kg; Free fatty acid content is 0.020%～0.060%.
3. according to claim 1 and 2 kind of zero trans-fat acid multidimensional one-stage VT 18 is characterized in that: do not add any chemosynthesis inhibitor in the said VT 18.
4. the preparation method of the described zero trans-fat of claim 1 acid multidimensional one-stage VT 18 is characterized in that: may further comprise the steps:
(1) soy material screening: mould beans content is 0 in the soy material that detection control processing is used, green soya bean content＜2.0%;
(2) the damp and hot enzymatic inactivation of defilming soybean-instantaneous high pressure: be heated to after the soybean removal of impurities 75-80 ℃ modified to carry out; Modified good soybean carries out the fragmentation decortication, at 55-65 ℃, under the hydraulic pressure 60-85bar soybean is rolled into the embryo sheet of 0.3-0.4mm and controls 55 ℃-70 ℃ of embryo sheet temperature, moisture 10-10.5% then; Subsequently the embryo sheet carry out expanded, WP 40-110Bar, directly vapour 3-6Kg/cm
2, indirect vapour 1-2Kg/cm
2, drop temperature is controlled at 105 ℃-125 ℃, uses the food grade normal hexane as solvent again after drying and the cooling, leaches down at extraction temperature 50-55 ℃, and the mixing oil that obtains takes off the acquisition crude oil through filtration, steaming;
(3) two enzymes come unstuck or super coming unstuck-do not have, and washing is long mixes the depickling coupling:
A. two enzymes come unstuck: control crude oil temperature is 70～75 ℃, adds Hydrocerol A acidifying 20～30min, is cooled to 50～60 ℃ afterwards; Transfer pH to 4.5; Add oil simultaneously and weigh 1.0～2.0% hot soft water, 20～50mg/kg phospholipase A and 100～300mg/kg Phospholipase C, mixed at high speed; Get into the enzyme reaction jar and keep 1.0～2.0h, be warming up to 85 ℃ of spinnings and go out grease; Or
B. controlling the crude oil temperature is 60～70 ℃; Add Hydrocerol A and cool to 40～45 ℃ of acidifying 15-20min; Add then that oil weighs that 1～2% soft water and oil weigh 1～3%, concentration is 2～3% flocculation agent, be warmed up to 80～85 ℃ behind the thorough mixing and carry out aquation, hydration time 20～30min; Spinning afterwards gets degummed oil; The temperature of controlling degummed oil again is 75 ℃, and adding oil, to weigh 0.02%～0.04% concentration be 75% phosphoric acid, carries out 10～15min reaction; With behind oily temperature drop to 40～45 ℃, add concentration and be 10～14% alkali lye and carry out alkali-refining deacidification reaction 30～45min, oil must neutralize after the spinning; Again will in and oil drying, dehydrated oil adds 0.1%～0.2% zeyssatite, at vacuum-0.085Mpa; Mix 20min under the condition that temperature is 100～105 ℃, filter to isolate grease;
(4) low activity discoloring agent two-step bleaching: with isolated grease in the step 3) 100-105 ℃ carry out drying after; It is decoloured through filling up the filter that has passed through the useless carclazyte that once decolours in advance; Re-add the carclazyte of 4-8kg/T oil then according to oil, mix the back vacuum tightness-0.08～-the 0.09Mpa condition under, decolouring 20-30min; Filter carclazyte, get bleached oil;
(5) low temperature deodorization in short-term: the vegetables oil after will decolouring to 165-185 ℃, is sent oil into tray column through deaerator deoxygenation post-heating then, through high-temperature steam oil is heated to 205-235 ℃; The open steam stripping carried out the temperature-sensitive decolouring in 10-15 minute; Then oil is sent into packing tower, keep 205-235 ℃ temperature 5-8min to slough lipid acid, get into tray column afterwards again and stopped 10-20 minute; At last oil cooling is carried out the essence filter after 35-45 ℃, get deodorised oil;
(6) nitrogen-charging fresh-keeping.
5. the preparation method of zero trans-fat acid multidimensional one-stage VT 18 according to claim 4; It is characterized in that: carry out two-stage in short-term in the deodorising process simultaneously at above-mentioned low temperature and capture: the two-stage overhead product of promptly collecting deodorization distillate; The capture temperature of first step cut is 130-150 ℃; Comprise VE and sterol in the overhead product; The capture temperature of second stage cut is 40～100 ℃, comprises lipid acid in the overhead product; Again first step cut is joined deodorised oil or again through joining in the deodorised oil again after at least once the deodorization circulation.
6. the preparation method of zero trans-fat acid multidimensional one-stage VT 18 according to claim 4, it is characterized in that: the modified employing pressure of soybean heats less than the steam of 1.5bar.
7. the preparation method of zero trans-fat acid multidimensional one-stage VT 18 according to claim 4 is characterized in that: during two enzymes came unstuck and handle, the crude oil acidifying was that the concentration of interpolation crude oil weight 0.04% is 50% Hydrocerol A.
8. the preparation method of zero trans-fat acid multidimensional one-stage VT 18 according to claim 4, it is characterized in that: during two enzymes came unstuck and handle, the adjust pH working concentration was 40% alkali lye.
9. the preparation method of zero trans-fat acid multidimensional one-stage VT 18 according to claim 4 is characterized in that: the nitrogen-charging fresh-keeping packing in the step 6) is to send jar with refining oil, in jar, fills nitrogen again, makes its concentration reach 85-90%.
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