WO2014166273A1 - 一种β−羟基−β−甲基丁酸的纯化方法 - Google Patents

一种β−羟基−β−甲基丁酸的纯化方法 Download PDF

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Publication number
WO2014166273A1
WO2014166273A1 PCT/CN2013/088762 CN2013088762W WO2014166273A1 WO 2014166273 A1 WO2014166273 A1 WO 2014166273A1 CN 2013088762 W CN2013088762 W CN 2013088762W WO 2014166273 A1 WO2014166273 A1 WO 2014166273A1
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hydroxy
acid
methylbutyric acid
methylbutyrate
product
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PCT/CN2013/088762
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English (en)
French (fr)
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龙玲
汤永春
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技源科技(中国)有限公司
江阴技源药业有限公司
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Priority to US14/783,949 priority Critical patent/US9598344B2/en
Priority to DK13881969.3T priority patent/DK2985275T3/da
Priority to JP2016506755A priority patent/JP2016514733A/ja
Priority to PL13881969T priority patent/PL2985275T3/pl
Priority to EP13881969.3A priority patent/EP2985275B1/en
Priority to CA2909226A priority patent/CA2909226A1/en
Priority to AU2013386219A priority patent/AU2013386219B2/en
Priority to ES13881969T priority patent/ES2763547T3/es
Publication of WO2014166273A1 publication Critical patent/WO2014166273A1/zh
Priority to AU2018260972A priority patent/AU2018260972B2/en

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • C07C51/487Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/29Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with halogen-containing compounds which may be formed in situ

Definitions

  • the present invention belongs to the field of chemical synthesis; more specifically, the present invention relates to a method for purifying ⁇ -hydroxy- ⁇ -methylbutyric acid. Background technique
  • HMB ⁇ -Hydroxy- ⁇ -Methyl Butyrate
  • HMB calcium salt monohydrate often beta-hydroxy-beta-methylbutyrate.
  • may be an essential component of the muscle cell membrane under exercise stress; or it may regulate certain enzyme activities that play an important role in muscle growth.
  • Animal experiments including poultry, cattle, and pigs have shown that supplementation can increase lean body mass and lower body fat.
  • Tannic acid easily forms impurities at high temperatures and affects purity. It can't be rectified under normal pressure. It should be rectified under reduced pressure. Under the 40 mmHg column, the boiling point is about 120 °C, and the rectification time can not be long.
  • the equipment requires high temperature, high temperature, high vacuum, acid corrosion resistance. Chloride ion corrosion is difficult to meet the process requirements of the equipment, precision, structure, and material. After rectification, in addition to the product, there are still pre-fractions and bottoms of the bottoms. If the pre-fractions and residues are not used, the cost is not necessarily cost-effective. Therefore, the rectification method has problems such as high equipment requirements, high cost, and easy generation of by-products.
  • the repeated extraction washing method utilizes the difference in the ratio of HMB acid and impurities at different pHs in water and organic solvent, and purifies the HMB acid by multiple extraction and back extraction.
  • this method is intended to achieve a difficulty of 98% or more, and the product has poor color, and there is no high rectification method and salt formation crystallization method.
  • a method of purifying ⁇ -hydroxy- ⁇ -methylbutyric acid comprising:
  • the neutralization reaction comprises: dissolving the crude ⁇ -hydroxy- ⁇ -methylbutyric acid at 20-60 ° C (preferably 30-60 ° C). Adding a base to a pH of 6-8, adding diatomaceous earth, incubating at 40-75 ° C (preferably 45-75 ° C), filtering the harvested filtrate, and slowly cooling to -10-20 ° C to obtain Crystallization of ⁇ -hydroxy- ⁇ -methylbutyrate.
  • the crude ⁇ -hydroxy- ⁇ -methylbutyric acid is dissolved in an aqueous solvent; preferably, the aqueous solvent is selected from, but not limited to, water or ethanol.
  • the dissolving acidification comprises: adding a product containing ⁇ -hydroxy- ⁇ -methylbutyrate to a weight of 1-5 times (preferably 1-3 times) In pure water, the inorganic acid is added dropwise at 0-40 ° C (preferably 10-40 ° C) until the acid addition is stopped at pH 1-3.5.
  • the base is capable of forming a low solubility salt with HMB acid (preferably, the low solubility salt is less than 50%, such as less than 40%, less than 30%) , less than 20%, less than 10%) of a base (such as a divalent metal base); preferably, the base is selected from (but not limited to): calcium hydroxide, magnesium hydroxide (corresponding to the obtained ⁇ - Hydroxy- ⁇ -methylbutyrate such as calcium ⁇ -hydroxy- ⁇ -methylbutyrate or magnesium ⁇ -hydroxy- ⁇ -methylbutyrate.
  • the inorganic acid is selected from, but not limited to, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid.
  • the ⁇ -hydroxy- ⁇ -methylbutyric acid is extracted from the dissolved acidified product with an organic solvent to obtain an organic solvent extract, and then the organic solvent is removed to obtain a high-purity ⁇ -hydroxyl group. - ⁇ -methylbutyric acid.
  • the organic solvent is a solvent that is immiscible with water; selected from the group consisting of, but not limited to, methyl acetate, ethyl acetate, butyl acetate, n-butanol, methyl ethyl ketone, methyl Isobutyl ketone, dichloromethane, dichloroethane.
  • the extraction method is as follows: the organic solvent is extracted in 2 to 5 times, and after each addition of the organic solvent, the mixture is thoroughly stirred, and the organic phase is collected after standing to stand.
  • the organic solvent is removed by vacuum distillation.
  • the organic solvent is ethyl acetate, and the organic solvent is removed by vacuum distillation.
  • the distillation conditions are: a distillation temperature of 70 ° C, and a late vacuum of -0.09 Mpa or more. When the degree of vacuum reaches -0.09 MPa or more, the temperature reaches 60-70 ° C, and no bubbles are generated, and the distillation is finished.
  • the method further includes:
  • the inventors have unexpectedly and intensively found an ideal method for purifying ⁇ -hydroxy- ⁇ -methylbutyric acid ( ⁇ ).
  • the method comprises the following steps: firstly, the crude ⁇ -hydroxy- ⁇ -methylbutyric acid is neutralized with a base to obtain ⁇ -hydroxy- ⁇ -methylbutyrate, cooled and crystallized, and then dissolved and acidified, and extracted therefrom to obtain high. Purity ⁇ -hydroxy- ⁇ -methylbutyric acid.
  • the method does not require strict high temperature, high vacuum, etc., low equipment requirements, easy process control, and high purity of the obtained product.
  • the crude ⁇ -hydroxy- ⁇ -methylbutyric acid is reacted with a base to produce ⁇ -hydroxy- ⁇ -methylbutyrate.
  • the crystals are cooled, then dissolved and acidified, and extracted therefrom to obtain high-purity ⁇ -hydroxy- ⁇ -methylbutyric acid, which has good purity and mild operating conditions.
  • a vacuum distillation method is employed, and when the distillation temperature is not higher than 70 ° C, the degree of vacuum is lowered from low to high, and the solvent loss is reduced. , and then dry the organic solvent (such as ethyl acetate) as much as possible.
  • the method of the invention does not require strict high temperature, high vacuum and the like conditions, low equipment requirements, easy process control and high purity of the obtained product.
  • the quality of the product of the invention is as follows: Appearance: colorless to pale yellow transparent viscous liquid, high purity At 98%.
  • the materials used in the present invention are all materials which have been commercialized in the art.
  • the preparation of the crude ⁇ -hydroxy- ⁇ -methylbutyric acid is not particularly limited, and the raw materials and operating conditions existing in the art can be employed. Subsequent purification operations in accordance with the teachings of the present invention are understood to be included within the scope of the present invention as long as the crude ⁇ -hydroxy- ⁇ -methylbutyric acid is obtained.
  • the invention is further illustrated below in conjunction with specific embodiments. It is to be understood that the examples are merely illustrative of the invention and are not intended to limit the scope of the invention.
  • the experimental methods in the following examples which do not specify the specific conditions are usually in accordance with conventional conditions or according to the conditions recommended by the manufacturer. Percentages and parts are by weight unless otherwise stated.
  • the reaction product of 2.1 was pumped to the reaction vessel, the temperature was controlled at about 20 ° C, hydrochloric acid was added, the pH was adjusted to 2 to 3.5, the acid was added, and the mixture was allowed to stand for 30 minutes, and the underlying by-product chloroform was discharged by a sight glass.
  • the 2.2 reaction product is then pumped to the reaction vessel, concentrated in vacuo to about half of the volume before steaming, and cooled to
  • the mixture was filtered at 60 ° C or lower, the formed sodium chloride was filtered off, and the filtrate was combined to the reaction vessel.
  • the filtrate was extracted three times with ethyl acetate.
  • the pH was adjusted to 2-3.5 with hydrochloric acid before each extraction, and then ethyl acetate was added, and the mixture was thoroughly stirred, and then allowed to stand for separation.
  • the ethanol was added to the reaction vessel, and the crude HMB acid (about 40 Kg) prepared in Example 1 was all pumped into the reaction vessel, stirred, and heated to 40 to 60 ° C. After stabilization, calcium hydroxide was added to adjust the pH to 6.5 to 7.5. 2Kg of diatomaceous earth was added, and the mixture was kept at 60 to 65 ° C, filtered to a crystallizing kettle, and the material was slowly cooled to 0 to 10 ° C for heat preservation. 2.2 Centrifugation
  • step 2.1 The reaction product of step 2.1 was placed in a centrifuge equipped with a filter cloth, and centrifuged to obtain a wet product.
  • the centrifuged wet product is placed in a tray, placed in an oven, and dried at a controlled temperature of 60 to 80 ° C. After drying, HMB-Ca is obtained. This drying step can be omitted if solvent loss is not considered.
  • the three extracts are combined, and the ethyl acetate is distilled off under vacuum.
  • the distillation temperature is controlled at 40-70 ° C, the late vacuum is above -0.09 MPa, and the vacuum reaches -0.09 MPa or higher, and the temperature reaches 65-70 ° C, and No bubbles were generated in the kettle, and the distillation was completed, and the mixture was cooled to 50 ° C or lower to discharge high-purity HMB acid.
  • Example 3 Production of high purity HMB acid - latter stage HMB acid refining

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

本发明涉及一种β−羟基−β−甲基丁酸的纯化方法,包括:先将β−羟基−β−甲基丁酸粗品与碱进行中和反应获得β−羟基−β−甲基丁酸盐、冷却结晶,再将之溶解酸化,从中萃取获得高纯度β−羟基−β−甲基丁酸。本发明的方法无需严格的高温、高真空等条件,设备要求低、过程控制容易且获得的产品纯度高。

Description

一种 p-羟基 -p-甲基丁酸的纯化方法
技术领域
本发明属于化工合成领域; 更具体地, 本发明涉及一种 β-羟基 -β-甲基丁酸 的纯化方法。 背景技术
β-羟基 -β-甲基丁酸 (β -Hydroxy- β -Methyl Butyrate, HMB ,分子式 C5H1()O3) 是必需氨基酸亮氨酸的中间代谢产物。 亮氨酸是支链氨基酸, 属必需氨基酸, 在 体内不能产生, 对人体健康十分重要, 人类必须依靠饮食来保证亮氨酸的摄取, HMB 是亮氨酸的中间代谢产物。 食物中含有 HMB, 人体自身亦可产生少量的 HMB。
目前在保健品市场销售的是 HMB钙盐的单水化合物, 常为 β -羟基 - β -甲基 丁酸钙。尽管它在人体的代谢机制尚未明确, 但已被建议用于对抗阻力训练中的 肌肉蛋白质分解, 在助于最大限度地促进肌肉体积的增长。 有研究者提出假说: ΗΜΒ可能就是运动应激状态下肌细胞膜的必需组成成分; 或者其可能调节某些 对肌肉生长起重要作用的酶活性。 包括家禽、 牛、 猪在内的动物实验显示: 补充 ΗΜΒ可增加瘦体重、 降低体脂。
现有技术中, 合成 ΗΜΒ并不困难, 然而获得高纯度的 ΗΜΒ则有一定的困 难。 目前, 主要采用精馏法或反复萃取洗涤法来进行 ΗΜΒ提纯。
ΗΜΒ酸在高温下易生成杂质而影响纯度。 不能在常压下精馏, 要在减压下 精馏, 在 40 mmHg柱下, 沸点约 120°C, 且精馏时间不能长, 设备上要求较高, 高温, 高真空, 耐酸腐蚀, 耐氯离子腐蚀, 无论是设备的精度, 结构, 还是材质 均难达到工艺的要求。 精馏后除了产品外, 尚有前馏分和釜底残液, 如果没有利 用前馏分和釜残的途径, 成本上也不一定划算。 因此, 精馏法存在设备要求高、 成本高、 易于产生副产物等问题。
反复萃取洗涤法是利用 HMB酸和杂质在不同 PH下, 在水和有机溶剂中分 配比的不同, 通过多次萃取, 反萃取, 将 HMB酸纯化。但是,本方法想达到 98% 以上困难, 产品色泽差, 没有精馏法和成盐结晶法高。
因此, 本领域亟需开发改进的 HMB酸纯化方法, 以简化程序、 降低成本、 提尚广品质量。 发明内容
本发明的目的在于提供一种 β-羟基 -β-甲基丁酸的纯化方法。 在本发明的第一方面, 提供一种 β-羟基 -β-甲基丁酸的纯化方法, 所述方法 包括:
(1) 将 β-羟基 -β-甲基丁酸粗品与碱进行中和反应, 结晶,离心干燥获得含 β- 羟基 -β-甲基丁酸盐结晶产物;
(2) 在(1)产物中加入无机酸进行溶解酸化,从溶解酸化产物中萃取 β-羟基 -β- 甲基丁酸, 获得高纯度 β-羟基 -β-甲基丁酸。
在一个优选例中, 步骤 (1)中, 所述的中和反应包括: 将 β-羟基 -β-甲基丁酸 粗品溶解, 在 20-60°C (较佳地 30-60°C )下加入碱, 至 pH达到 6-8, 加入硅藻土, 在 40-75°C (较佳地 45-75 °C )保温, 过滤收获滤液, 慢慢冷却至 -10-20°C, 获得 β- 羟基 -β-甲基丁酸盐结晶。
在另一优选例中, 所述的 β-羟基 -β-甲基丁酸粗品溶解于水性溶剂; 较佳地, 所述的水性溶剂选自(但不限于): 水或乙醇。
在另一优选例中, 步骤 (2)中, 所述的溶解酸化包括: 将含 β-羟基 -β-甲基丁 酸盐的产物加入 1-5倍 (较佳地 1-3倍)重量的纯水, 于 0-40°C (较佳地 10-40°C )下 滴加无机酸, 直至 pH 1-3.5停止滴加酸。
在另一优选例中, 所述的碱是能和 HMB 酸形成低溶解性盐 (较佳地, 所述 的低溶解性盐是溶解度低于 50%,如低于 40%,低于 30%,低于 20%,低于 10%) 的碱 (如二价金属碱); 较佳地, 所述的碱选自(但不限于): 氢氧化钙, 氢氧化镁 (对应获得的 β-羟基 -β-甲基丁酸盐如 β-羟基 -β-甲基丁酸钙、 β-羟基 -β-甲基丁酸 镁)。
在另一优选例中, 所述的无机酸选自(但不限于): 盐酸, 硫酸, 硝酸, 磷酸。 在另一优选例中, 步骤 (2)中, 用有机溶剂从溶解酸化产物中萃取 β-羟基 -β- 甲基丁酸, 获得有机溶剂萃取液, 之后去除有机溶剂, 获得高纯度 β-羟基 -β-甲 基丁酸。 在另一优选例中, 所述的有机溶剂是与水不互溶的溶剂; 选自 (但不限于 醋酸甲酯, 醋酸乙酯, 醋酸丁酯, 正丁醇, 甲基乙基酮, 甲基异丁酮, 二氯甲垸, 二氯乙院。
在另一优选例中, 萃取方法为: 有机溶剂分 2-5次萃取, 每次加入有机溶剂 后, 充分搅拌, 静置分层后收集有机相。
在另一优选例中, 步骤 (3)中, 通过真空蒸馏的方法去除有机溶剂。
在另一优选例中, 所述的有机溶剂是乙酸乙酯, 通过真空蒸馏的方法去除有 机溶剂, 所述的蒸馏的条件是: 蒸馏温度为 70°C, 后期真空度在 -0.09 Mpa以 上, 当真空度达到 -0.09Mpa以上, 温度达到 60-70°C, 且无气泡产生, 蒸馏结束。
在另一优选例中, 步骤(1)之前, 还包括:
(a) 将二丙酮醇与次氯酸盐反应生成含 β-羟基 -β-甲基丁酸盐的产物;
(b) 将(a)的含 β-羟基 -β-甲基丁酸盐的产物与无机酸反应, 获得 β-羟基 _β- 甲基丁酸粗品。 本发明的其它方面由于本文的公开内容,对本领域的技术人员而言是显而易 见的。 具体实施方式
本发明人经过反复而深入的研究, 意外地找到一种理想的纯化 β-羟基 -β-甲 基丁酸 (ΗΜΒ)的方法。 所述的方法包括: 先将 β-羟基 -β-甲基丁酸粗品与碱中和 反应获得 β-羟基 -β-甲基丁酸盐、 冷却结晶, 再将之溶解酸化, 从中萃取获得高 纯度 β-羟基 -β-甲基丁酸。 所述方法无需严格的高温、 高真空等条件, 设备要求 低、 过程控制容易且获得的产品纯度高。 制备 β-羟基 -β-甲基丁酸粗品, 目前主要采用以下化学反应: 首先将二丙酮 醇与次氯酸钠反应生成含 β-羟基 -β-甲基丁酸钠的水溶液; 再将含 β-羟基 -β-甲基 丁酸钠的产物与酸反应, 获得 β-羟基 -β-甲基丁酸粗品水溶液, 用有机溶剂多次 萃取水溶液, 合并有机相, 真空脱溶剂得 β-羟基 -β-甲基丁酸粗品。
本发明中,将 β-羟基 -β-甲基丁酸粗品和碱反应,产生 β-羟基 -β-甲基丁酸盐, 冷却结晶, 再将之溶解酸化, 从中萃取获得高纯度 β-羟基 -β-甲基丁酸, 其纯度 好、 操作条件温和。
在本发明的优选方式中, 在进行脱溶 (除去有机溶剂)时, 采取减压蒸馏的方 法, 控制蒸馏温度不高于 70°C的情况下, 真空度由低到高, 既降低溶剂损耗, 又将有机溶剂 (如乙酸乙酯)尽量蒸干尽。
本发明所述方法无需严格的高温、 高真空等条件, 设备要求低、 过程控制容 易且获得的产品纯度高, 本发明的产品质量如下: 外观: 无色至浅黄色透明粘稠 液体, 纯度高于 98%。
本发明所应用的原料均是本领域已经商业化的材料。 本发明对于 β-羟基 -β- 甲基丁酸粗品的制备没有特殊的限制, 可采用本领域已有的原料、 操作条件。 只 要在获得 β-羟基 -β-甲基丁酸粗品后, 按照本发明提供的思路进行后续的纯化操 作, 均应理解为包含在本发明的保护范围内。 下面结合具体实施例, 进一步阐述本发明。 应理解, 这些实施例仅用于说明 本发明而不用于限制本发明的范围。 下列实施例中未注明具体条件的实验方法, 通常按照常规条件, 或按照制造厂商所建议的条件。 除非另外说明, 否则百分比 和份数按重量计算。
除非另行定义,文中所使用的所有专业与科学用语与本领域熟练人员所熟悉 的意义相同。此外, 任何与所记载内容相似或均等的方法及材料皆可应用于本发 明中。 文中所述的较佳实施方法与材料仅作示范之用。 实施例 1、 高纯 ΗΜΒ酸的生产——前段 ΗΜΒ酸粗品生产
1、 原辅料
前段 ΗΜΒ酸粗品生产所用的原料和辅料如表 1。 表 1
Figure imgf000006_0001
2、 操作过程及工艺参数
2.1 氧化合成 (本反应为强放热反应)
用泵打次氯酸钠至反应釜, 慢慢加入二丙酮醇 (DIA), 控制加入速度, 使釜 内物料在整个反应过程中控制在 10°C〜20°C, 直到加入 DIA时温度明显下跌, 说明不再发生反应, 已达反应终点, 停止加 DIA。 2.2 酸化
将 2.1反应产物抽料到反应釜, 控制温度在约 20°C, 加盐酸, 调节 pH值至 2〜3.5, 加酸结束, 静置 30分钟, 通过视镜观察排出底层副产物氯仿。
2.3 蒸水
然后将 2.2反应产物抽到反应釜, 真空浓缩至约蒸水前体积的一半, 冷却至
60°C以下放料过滤, 过滤掉生成的氯化钠, 合并滤液至反应釜。
2.4 萃取
用乙酸乙酯分三次萃取上述滤液, 每次萃取前用盐酸调节 pH值至 2-3.5, 每 次加乙酸乙酯结束, 充分搅拌、 静置后分层后, 获取乙酸乙酯层。
2.5 脱乙酸乙酯
将上述萃取后的乙酸乙酯合并抽入反应釜。采用真空蒸馏,将乙酸乙酯蒸出, 冷却至 60°C以下, 放料, 得 HMB酸粗品。 实施例 2、 高纯 HMB酸的生产——后段 HMB酸精制
1、 原辅料
HMB酸粗品精制生产所用的原料和辅料如表 2。 表 2
Figure imgf000007_0001
2、 操作过程及工艺参数
2.1 中和结晶
反应釜中加入乙醇,将实施例 1制备的 HMB酸粗品(约 40Kg)全部抽入反应 釜, 搅拌, 加热到 40〜60°C, 稳定后加入氢氧化钙调节 pH值至 6.5〜7.5, 再加 入硅藻土 2Kg, 在 60〜65 °C保温, 过滤到结晶釜, 物料慢慢冷却至 0-10°C保温。 2.2 离心
将 2.1步骤的反应产物放入已铺好滤布的离心机, 离心得到湿品。
2.3 干燥
离心出的湿品置于托盘中, 放入烘箱, 控制温度 60〜80°C进行干燥, 烘干 后得 HMB-Ca。 如不考虑溶剂损耗, 该干燥步骤可省去。
2.4 溶解酸化 将 2.3所得的 HMB-Ca称重, 加入 3倍重量的纯水, 于 20-30°C温度下, 滴 加盐酸, 搅拌溶解, 当 PH达到 2-3时, 停止加盐酸。
2.5 萃取
用乙酸乙酯分三次,萃取上述经溶解酸化的料液,每次加乙酸乙酯,于 20-30
°C充分搅拌、 静置分层后收集乙酸乙酯层。
2.6 脱溶剂
合并三次萃取液, 用真空蒸出乙酸乙酯, 蒸馏温度控制在 40-70°C, 后期真 空度在 -0.09Mpa以上, 当真空度达到 -0.09Mpa以上, 温度达到 65-70°C, 且釜内 无气泡产生, 蒸馏结束, 冷却至 50°C以下放料, 得高纯 HMB酸。
测定上述方法获得 HMB酸的纯度为 99.6%, 产品色泽优良。 实施例 3、 高纯 HMB酸的生产——后段 HMB酸精制
应用的原辅料、 操作过程及工艺参数如实施例 2。 不同点仅在于中和结晶采 取以下方法:
将 HMB酸粗品约 40Kg抽入反应釜, 加入 120KG去离子水, 于 30-50°C下 加入氢氧化钙, 调节 PH= 6.5-7.5, 加入 2Kg硅藻土, 升温到 65-70°C保温 10分 钟, 过滤到反应釜。 将物料慢慢冷却至 0-10°C。
之后, 离心、 干燥、 溶解酸化、 萃取、 脱溶的步骤同实施例 2。
测定上述方法获得 HMB酸的纯度为 99.8%, 产品色泽优良。 实施例 4、 高纯 HMB酸的生产——原辅料可用性研究
采用与实施例 2基本类似的材料、操作过程及工艺参数, 不同之处列于如下 3中。 表 3
Figure imgf000009_0001
获得最终产品 HMB酸含量列于表 3中, 可见原料的适当替换也可以获得色泽优良、 纯度高的产物。 在本发明提及的所有文献都在本申请中引用作为参考, 就如同每一篇文献被 单独引用作为参考那样。 此外应理解, 在阅读了本发明的上述讲授内容之后, 本 领域技术人员可以对本发明作各种改动或修改, 这些等价形式同样落于本申请所 附权利要求书所限定的范围。

Claims

权 利 要 求
1. 一种 β-羟基 -β-甲基丁酸的纯化方法, 其特征在于, 所述方法包括:
(1) 将 β-羟基 -β-甲基丁酸粗品与碱进行中和反应, 结晶, 离心干燥获得含 β- 羟基 -β-甲基丁酸盐结晶产物;
(2) 在 (1)产物中加入无机酸进行溶解酸化, 从溶解酸化产物中萃取 β-羟基 -β- 甲基丁酸, 获得高纯度 β-羟基 -β-甲基酸。
2. 如权利要求 1所述的方法, 其特征在于, 步骤 (1)中, 所述的中和反应包括: 将 β-羟基 -β-甲基丁酸粗品溶解, 在 20-60°C下加入碱, 至 pH达到 6-8, 加入硅藻 土, 在 40-75 °C保温, 过滤收获滤液, 慢慢冷却至 -10-20°C, 获得 β-羟基 -β-甲基丁 酸盐结晶。
3. 如权利要求 2所述的方法, 其特征在于, 所述的 β-羟基 -β-甲基丁酸粗品溶 解于水性溶剂; 较佳地, 所述的水性溶剂选自: 水或乙醇。
4. 如权利要求 1所述的方法, 其特征在于, 步骤 (2)中, 所述的溶解酸化包括: 将含 β-羟基 -β-甲基丁酸盐的产物加入 1-5倍重量的纯水,于 0-40°C下滴加无机酸, 直至 pH 1 -3.5停止滴加酸。
5. 如权利要求 1所述的方法, 其特征在于, 所述的碱是低溶解性的金属盐; 较 佳地, 所述的碱选自: 氢氧化钙, 氢氧化镁。
6. 如权利要求 1所述的方法, 其特征在于, 所述的无机酸选自: 盐酸, 硫酸, 硝酸, 磷酸。
7. 如权利要求 1所述的方法, 其特征在于, 步骤 (2)中, 用有机溶剂从溶解酸化 产物中萃取 β-羟基 -β-甲基丁酸, 获得有机溶剂萃取液, 之后去除有机溶剂, 获得 高纯度 β-羟基 -β-甲基丁酸。
8. 如权利要求 7所述的方法, 其特征在于, 所述的有机溶剂是与水不互溶的溶 剂; 选自: 醋酸甲酯, 醋酸乙酯, 醋酸丁酯, 正丁醇, 甲基乙基酮, 甲基异丁酮, 二 氯甲垸, 二氯乙垸。
9. 如权利要求 7所述的方法, 其特征在于, 步骤 (3)中, 通过真空蒸馏的方法去 除有机溶剂。
10. 如权利要求 1所述的方法, 其特征在于, 步骤 (1)之前, 还包括:
(a) 将二丙酮醇与次氯酸盐反应生成含 β-羟基 -β-甲基丁酸盐的产物;
(b) 将 (a)的含 β-羟基 -β-甲基丁酸盐的产物与无机酸反应, 获得 β-羟基 -β-甲基 丁酸粗品。
PCT/CN2013/088762 2013-04-12 2013-12-06 一种β−羟基−β−甲基丁酸的纯化方法 WO2014166273A1 (zh)

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