The invention provides a method for synthesizing methionine by continuous and efficient alkali hydrolysis of 5 \u2011 (\u03b2 \u2011 methylthioethyl) - hydantoin, which comprises the following steps: the alkali and 5 \u2011 (\u03b2 \u2011 methylthioethyl) - hydantoin aqueous solution are pre activated by low-frequency ultrasound, and then the hydrolysis reaction is carried out in a microchannel reactor, the reaction temperature is controlled to be 120 \u2103 ~ 140 \u2103, the pressure is 0.2MPa ~ 0.8MPa, and the reaction material is in the microchannel The retention time was 2-5min and DL-methionine was obtained. By combining ultrasonic pre activation and microchannel reaction in the hydrolysis step, the invention obtains high selection and high efficiency hydrolysis effect superior to the traditional process, especially greatly reduces adverse by-products such as dipeptides, diketopyrazine, amides, hydantoin, improves the conversion rate of raw materials and the quality of the final circulating mother liquor, and is favorable for the long-term and stable preparation of methionine; in addition In addition, the amount of alkali used was reduced to a certain extent, the low value by-product inorganic salt was reduced, and the production cost of methionine was correspondingly reduced.
【技术实现步骤摘要】
一种连续快速碱解5-(β-甲硫基乙基)-乙内酰脲合成蛋氨酸的方法
本专利技术涉及化工领域,特别涉及一种连续快速碱解5-(β-甲硫基乙基)-乙内酰脲合成蛋氨酸的方法。技术背景蛋氨酸又名甲硫氨酸,是构成蛋白质的基本单位之一,是必需氨基酸中唯一含有硫的氨基酸,除了参与动物体内甲基的转移、磷的代谢和肾上腺素、胆碱、肌酸的合成外,还是合成蛋白质和胱氨酸的原料。蛋氨酸广泛用于医药、食品、饲料和化妆品等领域,其中作为饲料添加剂的用量最大,2018年我国的蛋氨酸的需求量达到了23万吨左右,进口量达到了近18万吨,将近80%的需求量依靠进口,国内蛋氨酸产能只有15万吨,远远不能满足需求。5-(β-甲硫基乙基)-乙内酰脲是化学法合成蛋氨酸重要中间体,5-(β-甲硫基乙基)-乙内酰脲又简称海因,海因法合成蛋氨酸目前主要的工艺有钠盐工艺和钾盐工艺,即所谓的钠盐工艺(如专利CN102659650B、US4391988、US4259525所述)是使用氢氧化钠水解5-(β-甲硫基乙基)-乙内酰脲,氢氧化钠与5-(β-甲硫基乙基)-乙内酰脲的投料摩尔比为1.8~6.0:1.0,水解温度为18 ...
【技术保护点】
1.一种连续高效碱解5‑(β‑甲硫基乙基)‑乙内酰脲合成蛋氨酸的方法,其特征在于,将碱与5‑(β‑甲硫基乙基)‑乙内酰脲水溶液经低频超声波活化后通入微通道反应器进行水解反应,控制反应温度为120℃~140℃,压力为0.5MPa~1.5MPa,反应物料在微通道内的停留时间为2~5min,得到DL‑蛋氨酸。
【技术特征摘要】
1.一种连续高效碱解5-(β-甲硫基乙基)-乙内酰脲合成蛋氨酸的方法,其特征在于,将碱与5-(β-甲硫基乙基)-乙内酰脲水溶液经低频超声波活化后通入微通道反应器进行水解反应,控制反应温度为120℃~140℃,压力为0.5MPa~1.5MPa,反应物料在微通道内的停留时间为2~5min,得到DL-蛋氨酸。2.根据权利要求1所述的方法,其特征在于:所述低频超声波为25~30Hz频率的超声波,活化温度为80~120℃,活化时间为3~8min。3.根据权利要求1所述的方法,其特征在于:控制反应的压力为0.2MPa~0.6MPa。4.根据权利要求1所述的方法,其特征在于:反应物在微通道内的停留时间为3~5min。5.根据权利要求1所述的方法,其特征在于:将碱液与5-(β-甲硫基乙基)-乙内酰脲水溶液同时加入微通道反应器进行水解反应。6.根据权利...
【专利技术属性】
技术研发人员:周荣超,廖常福,粟宇,
申请(专利权)人:禄丰天宝磷化工有限公司,
类型:发明
国别省市:云南,53
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