WO2020007335A1 - 一种降低甘油酯碘值的方法 - Google Patents
一种降低甘油酯碘值的方法 Download PDFInfo
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- WO2020007335A1 WO2020007335A1 PCT/CN2019/094644 CN2019094644W WO2020007335A1 WO 2020007335 A1 WO2020007335 A1 WO 2020007335A1 CN 2019094644 W CN2019094644 W CN 2019094644W WO 2020007335 A1 WO2020007335 A1 WO 2020007335A1
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- glyceride
- iodine value
- fatty acid
- reaction
- reducing
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
- C11C1/00—Preparation of fatty acids from fats, fatty oils, or waxes; Refining the fatty acids
- C11C1/02—Preparation of fatty acids from fats, fatty oils, or waxes; Refining the fatty acids from fats or fatty oils
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
- C11C3/00—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom
- C11C3/04—Fats, oils, or fatty acids by chemical modification of fats, oils, or fatty acids obtained therefrom by esterification of fats or fatty oils
- C11C3/10—Ester interchange
Definitions
- the present application relates to the technical field of glyceride synthesis and processing, and in particular, to a method for reducing the iodine value of glyceride.
- glyceride with a lower iodine value is needed as a raw material for chemical production.
- the existing methods for increasing the saturation of glycerides are mainly carried out through chemical catalysis, and the reaction requires high temperature and harsh process conditions. Therefore, there is an urgent need for a simple process that can effectively reduce the iodine value of glycerides.
- the purpose of the present application is to provide a method for reducing the iodine value of glyceride, which can increase the content of saturated fatty acids in the glyceride, thereby effectively reducing the iodine value of the glyceride, and has simple reaction conditions and few side reactions.
- the present application provides a method for reducing the iodine value of glycerides, which includes: catalyzing a glyceride, a saturated fatty acid, and a base under the action of a lipase.
- Some embodiments of the present application provide a method for reducing the iodine value of glycerides, which includes: catalyzing a glyceride, a saturated fatty acid and an alkali under the action of a lipase to obtain a glyceride having a high content of saturated fatty acids.
- Iodine value is an indicator of the degree of unsaturation in organic compounds. Refers to the grams of iodine that can be absorbed (added) in 100g of material. Mainly used for the determination of oils, fatty acids, waxes and polyesters. The greater the degree of unsaturation, the higher the iodine value.
- the glyceride may be a monoglyceride, or a diglyceride, or a triglyceride, or a mixture of a diglyceride and a triglyceride.
- the catalytic reaction includes a transesterification reaction and an esterification reaction.
- the transesterification reaction is mainly performed.
- the glyceride includes a part of a diglyceride or a monoglyceride, an ester is also present. ⁇ ⁇ Reaction.
- the glyceride is a glyceride containing saturated fatty acid residues, preferably the glyceride has an iodine value greater than 20, and preferably, the saturated fatty acid corresponding to the saturated fatty acid residue contained in the glyceride corresponds to at least the saturated fatty acid The same kind of saturated fatty acid.
- a large number of fatty acid residues are provided by introducing specific saturated fatty acids and specific fatty acid salts generated in situ, thereby enabling it to occur under the catalysis of lipase.
- the transesterification and esterification reactions further reduce the reaction conditions, resulting in fewer side reactions and a lower iodine value of the glycerides.
- the ratio of glyceride to saturated fatty acid is saturated fatty acid as an added amount, so that the ratio of saturated fatty acid residues in the reaction system to the total fatty acid residues is greater than or equal to 90%, preferably greater than 92%, more It is preferably greater than 95%.
- the addition of saturated fatty acids can be such that the proportion of saturated fatty acid residues in the reaction system to the total fatty acid residues is 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, or 98 %Wait.
- the molar ratio of the base to the saturated fatty acid is not more than 1, preferably, the molar ratio of the base to the fatty acid is not more than 0.025, and further preferably, the molar ratio of the base to the fatty acid is 0.025 to 0.0001.
- the base is selected from the group consisting of NaOH, KOH, NaOC 2 H 5 , KOC 2 H 5 , NaOCH 3 , KOCH 3, a solid base catalyst, and mixtures thereof. Even more preferably, the base is NaOH or KOH.
- the lipase may be a non-targeted lipase, and the added amount is 0.05 to 10% of glyceride, preferably 0.1 to 8%.
- Novozym 435 is added in an amount of 4 to 8%.
- the addition amount of Lipase DF "Amano" 15 is 0.1 to 1%
- the addition amount of LipozymeTLIM is 4 to 8%
- the addition amount of LipaseAY30G is 0.1 to 1%.
- the amount of non-directional lipase added may be 0.05%, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or 9%.
- the amount of non-directed enzymes has an important effect on the reaction process. Too low an addition amount cannot achieve the catalytic effect. Too high an addition amount will increase the cost, and will affect the reaction between the reactants to a certain extent. Contact, resulting in poor response. Therefore, by adding the non-directional lipase in the above range, the catalytic effect on the reaction can be sufficiently achieved, so that the reaction proceeds more thoroughly within the predetermined reaction time.
- the lipase includes at least one of non-directional lipase and directional lipase.
- the lipase is non-directional lipase, and the non-directional lipase is Novozym 435, Lipase DF "Amano" 15, LipozymeTLIM and LipaseAY30G At least one of.
- the non-targeted lipase may be Novozym 435 or Lipase DF "Amano" 15 or a mixture of Novozym 435 and Lipase DF "Amano" 15.
- the non-directional lipase is Lipase DF "Amano" 15.
- the temperature of the catalytic reaction is 30-90 ° C, preferably 35-85 ° C, further preferably, the reaction temperature of LipozymeTLIM is 65-70 ° C, the reaction temperature of Novozym 435 is 75-85 ° C, and Lipase DF "Amano" 15
- the reaction temperature is 35 to 40 ° C
- the LipaseAY30G reaction temperature is 35 to 40 ° C.
- the time for the catalytic reaction is 0.5 to 9 hours, and the preferred reaction time is 1 to 4 hours.
- the reaction temperature is relatively low compared to the reaction temperature of traditional chemical catalysts, and the reaction is easier.
- the reaction temperature can be kept constant by heating in a water bath. The water bath is heated more uniformly, and the heat transfer effect is good. Makes the reaction easier. Of course, other heating methods such as furnace heating can also be used to maintain the reaction temperature.
- the raw material saturated fatty acid participating in the reaction is selected from at least one of palmitic acid, stearic acid, caprylic acid, capric acid, lauric acid, myristic acid and arachidic acid, preferably palmitic acid, stearic acid, myristic acid and lauric acid At least one kind of acid, more preferably at least one kind of palmitic acid and stearic acid.
- palmitic acid or stearic acid, or a saturated fatty acid may also be a mixture of palmitic acid and stearic acid in a certain ratio.
- the base can generate fatty acid salts in situ with fatty acids in the reaction system. It is a strong base and weak acid salt with strong ionization ability and strong fatty acid residue activity. The ability of fatty acid residues is much greater than that of free fatty acids or fatty acid esters, thereby speeding up the rate of transesterification, shortening the reaction time, reducing the amount of lipase and reducing costs.
- the glyceride containing saturated fatty acid residues may be cocoa butter, coconut oil, palm kernel oil, or palm oil.
- the glyceride containing a saturated fatty acid residue is palm oil.
- performing the catalytic reaction specifically includes mixing a glyceride, a saturated fatty acid, and an alkali, adding a lipase, and performing a stirring reaction under the condition of inert gas.
- the protection of inert gas can prevent the outside air from affecting its reaction, and stirring can make the reactants fully contact and make the reaction more fully and quickly.
- performing the catalytic reaction preferably includes mixing a glyceride containing a saturated fatty acid residue and a saturated fatty acid salt, adding a non-directional lipase, and performing a stirring reaction under the condition of inert gas.
- the rotation speed of the stirring during the reaction is 300 to 600 r / min, preferably 400 to 500 r / min.
- the inert gas may be selected from nitrogen, neon, and argon.
- the inert gas is nitrogen.
- the reaction system further includes a solvent.
- a solvent By adding a solvent to the reaction system, the reactants and reaction products can be dissolved in the solvent, which facilitates the phase flow between the reactants and has a good effect during the reaction. The mass transfer effect makes the reaction better.
- the solvent can extract the product.
- the solvent may be added to the reaction system together with the reactants, or may be gradually added to the reaction system during the reaction.
- the solvent is n-hexane.
- the amount of the solvent added is 1 to 2 times the mass of the raw material glyceride.
- the soap in the organic phase is removed by silica gel adsorption and then concentrated.
- the soap in the organic phase can be removed by silica gel adsorption.
- the excess fatty acid is removed after the catalytic reaction, and preferably, the removal of the excess fatty acid is performed by molecular distillation.
- the mass ratio of saturated fatty acid and glyceride may be an amount of addition based on the ratio of the iodine value of glyceride to the expected value of iodine value of the product, so that the mass ratio of saturated fatty acid to glyceride is not less than the iodine value of the glyceride raw material and The expected iodine value of the product is reduced by one.
- a method for reducing the iodine value of glycerides includes: carrying out a catalytic reaction of a glyceride containing palmitic acid residues, palmitic acid, and an alkali under the action of a non-directional lipase to obtain low iodine Value of glyceryl tripalmitate.
- the glyceride as a raw material is a triglyceride.
- low-iodine glycerides can also be used to synthesize USU-type triglycerides, such as 1,3-dioleic acid-2-palmitic acid triglycerides (OPO).
- OPO 1,3-dioleic acid-2-palmitic acid triglycerides
- the preparation method may be: carrying out the Sn-1,3 position enzymatic directed reaction of the prepared low-iodine glyceride and unsaturated fatty acid or unsaturated fatty acid glyceride under the catalysis of sn-1,3 specific lipase, USU-type triglycerides were prepared.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil, so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 90%, and 1000 g of palm oil stearin and 1000 ml of n-hexane were placed in four mouths. In the flask, the water bath was heated until dissolved, and then mixed with palmitic acid and sodium methoxide. The molar ratio of sodium methoxide to palmitic acid was 0.02.
- the iodine value of the palm oil undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 7.5.
- Palmitic acid and stearic acid according to the amount of palmitic acid residue and stearic acid residue in palm oil, so that the ratio of palmitic acid residue and stearic acid residue to the total fatty acid residue in the reaction system is 92 %
- the molar ratio is 8: 2: 0.1.
- 10 g of non-directional lipase LipaseAY30G5 was added under the conditions of a water bath temperature of 40 ° C.
- the supernatant of the organic phase was obtained by centrifugation.
- the soap in the organic phase was removed by adsorption on silica gel, and the free fatty acid was removed by molecular distillation to obtain a pale yellow solid.
- the total content of palmitic acid and stearic acid at the sn-2 position was 87.8%.
- the iodine value of the palm oil undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 7.1.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil, so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 94%, and 1000 g of palm oil stearin and 1500 ml of n-hexane were placed in four In the flask, the water bath was heated until dissolved, and then mixed with palmitic acid and potassium hydroxide. The molar ratio of potassium hydroxide to palmitic acid was 0.025.
- the iodine value of the palm oil undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 7.3.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil, so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 94%. 1000 g of palm oil stearin and 2000 ml of n-hexane were placed in four mouths. In the flask, heat in a water bath until dissolved and mix with palmitic acid and sodium ethoxide. The molar ratio of sodium ethoxide to palmitic acid was 0.00125.
- the iodine value of the palm oil undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 5.4.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 96%. 1000 g of palm oil stearin and 2000 ml of n-hexane were placed in four mouths. In the flask, the water bath was heated until dissolved, and then mixed with palmitic acid and potassium hydroxide. Among them, potassium hydroxide and palmitic acid were 0.016.
- the iodine value of the palm oil undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 6.2.
- the iodine value of the palm kernel oil subjected to the reaction was 30, and the iodine value of the glyceride product obtained after the reaction was 7.2.
- the iodine value of the palm kernel oil subjected to the reaction was 30, and the iodine value of the glyceride product obtained after the reaction was 6.4.
- the iodine value of the palm kernel oil subjected to the reaction was 30, and the iodine value of the glyceride product obtained after the reaction was 5.1.
- stearic acid according to the amount of stearic acid residues of cocoa butter, so that the ratio of stearic acid residues in the reaction system to the total fatty acid residues is 93%, and put 1000 g of cocoa butter and 1500 ml of n-hexane into four In the mouth flask, the water bath was heated until dissolved, and then mixed with stearic acid and a solid base catalyst (CAS No .: 534-59-8). The molar ratio of the solid base catalyst to stearic acid was 0.016.
- the iodine value of the reacted cocoa butter was 28, and the iodine value of the glyceride product obtained after the reaction was 5.8.
- stearic acid according to the amount of stearic acid residues of cocoa butter, so that the ratio of stearic acid residues in the reaction system to the total fatty acid residues is 93%, and put 1000 g of cocoa butter and 1500 ml of n-hexane into four In the flask, the water bath was heated until dissolved, and then mixed with stearic acid and potassium hydroxide. The molar ratio of potassium hydroxide and stearic acid was 0.001.
- the iodine value of the cocoa butter undergoing the reaction is 28, and the iodine value of the glyceride product obtained after the reaction is 6.0.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil stearin, so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 85%, and 1000 g of palm oil stearin and 2000 ml of n-hexane were placed in In a four-necked flask, heat the water bath until it melts and mix with palmitic acid and potassium hydroxide. The molar ratio of potassium hydroxide to palmitic acid was 0.016.
- the iodine value of the palm oil stearin undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 19.
- Palmitic acid was weighed according to the amount of palmitic acid residues of palm oil stearin, so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 94%, and 1000 g of palm oil stearin was placed in a four-necked flask. After heating in a water bath, it is mixed with palmitic acid and potassium hydroxide. The molar ratio of potassium hydroxide and palmitic acid was 0.025.
- the iodine value of the palm oil stearin reacted was 35, and the iodine value of the glyceride product obtained after the reaction was 20.3.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil so that the proportion of palmitic acid residues in the reaction system to the total fatty acid residues was 96%. 1000 g of palm oil stearin and 2000 ml of n-hexane were placed in four mouths. In the flask, the water bath was heated until dissolved, and then mixed with palmitic acid and potassium hydroxide. The molar ratio of potassium hydroxide to palmitic acid was 0.016. After introducing nitrogen, under the conditions of a water bath temperature of 65 ° C.
- the iodine value of the palm oil undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 19.2.
- Example 5 differs from Example 5 only in that the non-directional lipase LipaseDF "Amano" 15 added is 0.5 g.
- the glyceride product obtained after the reaction had an iodine value of 13.1.
- This example differs from Example 5 only in that the non-directional lipase LipaseDF "Amano" 15 added is 100 g.
- the glyceride product obtained after the reaction had an iodine value of 6.0.
- Example 5 The difference between this embodiment and Example 5 is that the temperature of the water bath for the catalytic reaction is 30 ° C.
- the glyceride product obtained after the reaction had an iodine value of 14.2.
- Example 5 The difference between this embodiment and Example 5 is that the temperature of the water bath for the catalytic reaction is 90 ° C.
- the glyceride product obtained after the reaction had an iodine value of 30.4.
- the iodine value of the palm oil stearin reacted was 35, and the iodine value of the glyceride product obtained after the reaction was 24.8.
- the iodine value of the palm oil stearin undergoing the reaction was 35, and the iodine value of the glyceride product obtained after the reaction was 23.2.
- Palmitic acid was weighed according to the amount of palmitic acid residues in palm oil, so that the ratio of palmitic acid residues in the reaction system to the total fatty acid residues was 96%, and 1000 g of palm oil stearin and 1500 ml of n-hexane were placed in four mouths.
- a flask heat in a water bath until dissolved and mix with palmitic acid.
- 10 g of non-directional lipase Lipase DF "Amano" 15 was added under the conditions of a water bath temperature of 40 ° C and a rotation speed of 380 r / min, and the reaction was stirred for 1.5 hours while keeping warm.
- the supernatant of the organic phase was obtained by centrifugation, and then the soap in the organic phase was removed by adsorption with silica gel, and concentrated to obtain a pale yellow solid, and the palmitic acid content at the sn-2 position was 78%.
- the palm oil undergoing the reaction has an iodine value of 35, and the glyceride product obtained after the reaction has an iodine value of 17.
- Example 5 According to the comparison between Example 5 and Example 13, it can be seen that the non-specific lipase and the specific lipase play a good catalytic effect in the preparation method of the embodiment of the present application.
- Example 5 By comparing Example 5 with Examples 14 and 15, it can be seen that the more the lipase is added, the smaller its iodine value is.
- Example 5 By comparing Example 5 with Examples 16 and 17, it can be seen that if the temperature is too high and the temperature is too low, the catalytic reaction effect will be significantly deteriorated.
- Examples 1-10 and Comparative Examples 1-3 it can be seen that the trisaturated fatty acid glycerides are produced in comparison with the fatty acid salt chemical catalysis or lipase production. The method has mild reaction conditions, reduced side reactions, and greatly improved purity.
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Abstract
Description
Claims (15)
- 一种降低甘油酯碘值的方法,其包括:将甘油酯、饱和脂肪酸和碱在脂肪酶的作用下进行催化反应。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述甘油酯与所述饱和脂肪酸的反应体系中饱和脂肪酸残基占总的脂肪酸残基的比例大于或等于90%,优选大于92%,更优选大于95%。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述脂肪酶的添加量为所述甘油酯的0.05~10%,优选地为0.1~8%%。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述脂肪酶为非定向脂肪酶。
- 根据权利要求4所述的降低甘油酯碘值的方法,其中,所述非定向脂肪酶是Novozym 435、Lipase DF“Amano”15、LipozymeTLIM和LipaseAY30G中的至少一种。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,催化反应的温度为30~90℃,优选35~85℃,催化反应的时间为0.5~9小时,优选的为1~4小时。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述甘油酯为含有饱和脂肪酸残基的甘油酯。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述甘油酯的碘值大于20。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述甘油酯含有的饱和脂肪酸残基对应的饱和脂肪酸至少与所述的饱和脂肪酸对应的一种饱和脂肪酸相同。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述甘油酯是 甘油一酯、甘油二酯和甘油三酯中的至少一种。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述饱和脂肪酸选自棕榈酸、硬酯酸、辛酸、癸酸、月桂酸、豆蔻酸或花生酸中至少一种,优选棕榈酸、硬酯酸、豆蔻酸和月桂酸中至少一种,更优选棕榈酸和硬酯酸中的至少一种。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述碱与所述饱和脂肪酸的摩尔比不大于1。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述碱选自NaOH、KOH、NaOC 2H 5、KOC 2H 5、NaOCH 3、KOCH 3、固体碱催化剂及其混合物,进一步优选地,所述碱为NaOH或KOH。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,进行催化反应具体包括将所述甘油酯与所述饱和脂肪酸和所述碱混合后加入所述脂肪酶,在通入惰性气体的条件下,进行搅拌反应。
- 根据权利要求1所述的降低甘油酯碘值的方法,其中,所述反应体系中还包括溶剂,所述溶剂优选正己烷。
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