Tartrate complex salt, and preparation and application thereof
A technology of tartaric acid and meso-tartaric acid, which is applied in the preparation of tartrate and its application field, can solve the problems of high dosage and high investment, and achieve good anti-caking effect and low cost
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[0016] Described preparation method comprises the following steps:
[0017] (1) Prepare an aqueous mixture. It contains 30%-70%wt, preferably 40%-60% mass concentration of L-tartaric acid, D-tartaric acid, meso-tartaric acid, racemic tartaric acid or a mixture of any of them dissolved in water to form A certain concentration of aqueous solution;
[0018] (2) Add ammonium salt and / or calcium salt to the obtained mixed solution, stir, and adjust the pH of the solution to 2-7, preferably 4-7;
[0019] (3) Heating in a water bath or an oil bath, and controlling the temperature at 40°C-100°C, preferably 60°C-80°C;
[0020] (4) Add ferrous (II) salt to the above mixture, stir, and keep the temperature at 60°C-80°C for 0.5-2h.
[0021] (5) The mixture is concentrated, crystallized, filtered, washed and dried to obtain the product.
[0022] Preferably the ammonium salt added in step (2) is (NH 4 ) 2 CO 3 or NH 4 HCO 3 aqueous solution, or the solid form of these two ammonium ...
Embodiment 1
[0026] A kind of tartaric acid double salt, raw material is composed of: L-tartaric acid, FeCl 2 , (NH 4 ) 2 CO 3 Formed double salt; among them, Fe 2+ The molar ratio to tartaric acid is 0.5; the molar ratio of ammonium ion to tartaric acid is 1.
[0027] The salt used in this example is dry sodium chloride ≥ 98%wt.
[0028] The tartrate double salt prepared by the present invention can be used as an anti-caking agent for salts, and a short-term intensified experiment is carried out by adopting an ordinary package storage method, and the anti-caking of the tartrate double salt is detected by detecting the strength and looseness of the salt sample to be tested. block effect.
[0029] Water was added to the salt to induce agglomeration and the samples were dried to >99%wt of the water evaporated. The time it takes depends on the concentration of anti-caking agent added.
[0030] Load 100g of sodium chloride salt samples into multiple containers respectively, add tartrate...
Embodiment 2
[0039] A kind of tartaric acid double salt, raw material composition is: the mixture of D-tartaric acid, meso-tartaric acid molar ratio is 1:1, FeCl 2 , Ca(HCO 3 ) 2 Formed double salt; among them, Fe 2+ The molar ratio with tartaric acid is 1; Ca 2+ The molar ratio with tartaric acid is 1.
[0040] The salt used in this example is dry potassium chloride ≥ 98%.
[0041] The tartrate double salt prepared by the invention is used as an anti-caking agent for potassium chloride, and its addition amount is between 0.01% and 0.1%. A short-term intensified experiment was carried out by means of ordinary packaging and storage, and the anti-caking effect of tartrate double salt was tested by testing the strength and looseness of the salt sample to be tested.
[0042] Put 100g of potassium chloride salt samples into multiple containers respectively, add tartrate double salts in different proportions, mix evenly, add a small amount of water to fully wet the mixed samples, and place ...
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