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Application of AK sugar crystal mother liquor and method for preparing sylvite by crystal mother liquor

A crystallization mother liquor, potassium salt technology, applied in carboxylate preparation, sulfate/bisulfate preparation, organic chemistry, etc., can solve the problems of product cost increase, environmental pollution, etc., reduce potassium content, reduce production cost, cost reduction effect

Active Publication Date: 2012-02-01
CHUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallization mother liquor of AK sugar is generally discharged as waste water. For every ton of AK sugar product produced, about 0.5 tons of waste water is produced. Direct discharge will cause environmental pollution and increase the cost of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 100mL crystallization mother liquor in a beaker, slowly add concentrated sulfuric acid while stirring at room temperature, make the pH of the mixture 3~4, cool to 20°C to crystallize, filter the mixture, recrystallize and dry to obtain white powdery potassium sulfate, The mass is 32.6 grams, and the mass fraction of potassium sulfate is more than or equal to 99%.

Embodiment 2

[0016] Take 100mL crystallization mother liquor respectively in 5 beakers, at room temperature, slowly add the solution of concentrated sulfuric acid and water with a volume ratio of 1:1 while stirring, so that the pH of the mixture is 8-9, 5-6, 3- 4. 1-2, <1, cooled to 20°C to crystallize, filtered the mixture, recrystallized and dried to obtain white powdery potassium sulfate, the masses were 0, 30.2, 31.6, 31.7, 31.8 grams, the mass of potassium sulfate Scores were all ≥99%.

Embodiment 3

[0018] Take 100mL crystallization mother liquor in 5 beakers, add concentrated sulfuric acid slowly while stirring respectively at room temperature, make the pH of the mixture 3~4, cool to 20°C to crystallize, filter the mixture, the filtrate is about 100mL. Add anhydrous methanol to the filtrate under stirring, so that the volume ratio of the filtrate to methanol is 1:0.2, 1:0.4, 1:0.8, 1:1, 1:1.2, filter the mixture, and combine the two filtrates , after recrystallization, filtration and drying, white powdery potassium sulfate is obtained, the masses are respectively 35.6, 38.6, 41.8, 42.5, 42.7 grams, and the mass fractions of potassium sulfate are all ≥99%.

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Abstract

The invention provides an application of AK sugar crystal mother liquor produced by a sulfamic acid-sulfur trioxide method, which is a sylvite preparation by using crystal mother liquor, and a method for preparing sylvite by using AK sugar crystal mother liquor. The method comprises the following steps: mixing crystal mother liquor and organic acid or inorganic acid, keeping a mixture in an acidic property, cooling, filtering, and recrystallizing to obtain sylvite. The sylvite is prepared by the AK sugar crystal mother liquor which is originally taken as waste water for discharging by using the sulfamic acid-sulfur trioxide method. The sylvite comprises inorganic salts, such as potassium sulfate; organic salts, such as potassium oxalate; even double salts, such as potassium alum. The obtained sylvite can be a product for sale, so that the production cost of AK sugar can be reduced. Simultaneously, the potassium content in waste water can be reduced and the environmental pollution caused by waste water is minimized. The invention aims at reducing the cost of AK sugar, minimizing the environmental pollution caused by waste water from the process, raising the economic, social and environmental benefits of AK sugar production process by using the sulfamic acid-sulfur trioxide method.

Description

technical field [0001] The invention relates to a method for treating waste liquid, in particular to a new application of crystallization mother liquor produced by using the sulfamic acid-sulfur trioxide method to produce AK sugar, and a method for preparing potassium salt by using the crystallization mother liquor. Background technique [0002] AK sugar, the chemical name is acesulfame potassium, 6-methyl-2,2-dioxo 1,2,3-oxathiazepine-4-cyclohexenone potassium salt, the English name is Acesulfame Potassium (Acesulfame K), referred to as ASK, commonly known as AK sugar, acesulfame potassium. Using sulfamic acid, diketene, sulfur trioxide, and triethylamine as the main raw materials to produce AK sugar (abbreviated as sulfamic acid-sulfur trioxide method), has the advantages of easy-to-obtain raw materials, mild reaction conditions, high yield, low cost, The product quality is good etc., most manufacturers of AK sugar adopt this method. [0003] The main production process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/07C07C51/41C01F7/76C01D5/02
Inventor 薛连海吴霖生葛秀涛李永红
Owner CHUZHOU UNIV
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