Preparation method of high-purity citric acid chelated copper
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A technology of citric acid and chelated copper, applied in the preparation of organic compounds, carboxylates, carboxylates, etc., can solve the problems of high reaction temperature, slow reaction rate, easy coating of raw materials, etc., and achieve high purity , The effect of short reaction time and good fluidity
Pending Publication Date: 2020-10-16
GUANGHAN LONGDA FEED
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[0004] However, in the existing preparation process of citric acid chelated copper, there are problems such as high reaction temperature, slow reaction rate, easy coating of raw materials due to product precipitation, and impure products.
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[0021] In order to overcome the problems of high reaction temperature, slow reaction rate, product precipitation and easy coating of raw materials, and impure products in the preparation process of citric acid chelated copper, the invention provides a method for preparing high-purity citric acid chelated copper , including the following steps:
[0022] S1: first dissolve citric acid in desalinated water, make a citric acid solution and put it into an enamel reaction kettle;
[0023] S2: According to the molar ratio of citric acid and formic acid is: 1:0.005-0.05, add formic acid catalyst in reactor;
[0024] S3: Add copper salt to the reaction kettle at normal temperature, the mass ratio of copper ions in citric acid and copper salt is 1:1.8-2.2, stir and react for 25-35min, filter, take the filtrate and put it into the reaction kettle, and heat up to 45 Stirring and reacting at -55°C for 25 minutes to generate citric acid chelated copper and dehydrate to obtain citric acid c...
Embodiment 1
[0029] A preparation method for high-purity citric acid chelated copper, comprising the following steps:
[0030] 1) Dissolve citric acid in desalinated water first, make a citric acid solution and put it into an enamel reaction kettle;
[0031] 2) add catalyst in reactor, catalyst is formic acid, according to the molar ratio of citric acid and described catalyst: 1:0.005;
[0032] 3) At room temperature, add basic copper carbonate to the reaction kettle, the mass ratio of citric acid and basic copper carbonate is 1:1, and stir for 30 minutes;
[0033] 4) Filter the reaction solution, take the filtrate and put it into the reaction kettle, heat up to 50°C, stir and react for 25min, and the reaction generates citric acid chelated copper;
[0034] 5) The product is centrifuged and dehydrated to obtain citric acid chelated copper crystals, and the liquid enters the mother liquor pool for recycling;
[0035] 6) using ethanol as a purifying agent to wash the obtained wet product c...
Embodiment 2
[0039] Embodiment 2 is compared with embodiment 1, except not adding formic acid catalyst, all the other are identical with embodiment 1.
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Abstract
The invention discloses a preparation method of high-purity citric acid chelated copper, and belongs to the field of preparation of trace element nutritional agents. The preparation method comprises the following steps: adding a formic acid catalyst into a reaction kettle according to a molar ratio of citric acid to formic acid of 1: (0.005-0.05); adding a copper salt into a reaction kettle at normal temperature, wherein the amount ratio of citric acid to copper ions in the copper salt is 1: 1.8-2.2, stirring and reacting citric acid and copper ions in the copper salt for 25-35 minutes, filtering, putting filtrate into the reaction kettle, heating to 45-55 DEG C, stirring and reacting for 25 minutes, reacting to generate citric acid chelated copper, and dehydrating to obtain citric acid chelated copper crystals. According to the invention, the formic acid is used as a catalyst; a product obtained by combining citric acid and copper ions is easily dissolved in water, copper formate is also easily dissolved in water, insoluble impurities such as lead and mercury in the raw materials can be removed through filtration, meanwhile, the situation that the product is impure, the reaction time is short and the reaction temperature is low (45-55 DEG C) due to the fact that citric acid chelated copper is generated through direct high-temperature reaction to coat the unreacted raw materials is avoided, and energy saving and environmental protection can be better realized.
Description
technical field [0001] The invention belongs to the field of preparation of trace element nutrients, in particular to a preparation method of high-purity citric acid chelated copper. Background technique [0002] Copper is a component of various enzymes in plants; stabilizes pigments, thereby promoting photosynthesis; participates in the lignification of cell walls; affects the formation of pollen; affects carbon metabolism and nitrogen metabolism. The metal elements and organic active substances are fully chelated by citric acid, which is a medium chelation strength, which not only effectively solves the compatibility problem, but also slow-releases citric acid, metal ions, and organic active substances in crops, and the slow-release effect is obvious. High absorption and utilization rate; slow release of citric acid and organic active substances can adjust the pH value of the soil environment to slightly acidic, which helps to form a soil environment that is beneficial to ...
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