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Method for producing potassium (sodium) sulfate at low temperature

A technology of potassium sulfate and potassium hydrogen sulfate, applied in the fields of inorganic salt industry and fertilizer industry, can solve problems such as difficulty in single furnace production capacity, large energy consumption, equipment corrosion, etc., and achieve light equipment corrosion, low reaction temperature, and fast reaction speed. Effect

Inactive Publication Date: 2014-10-29
柳仁民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems in the Mannheim method that the reaction needs to be carried out under the condition of high temperature and strong acid, high energy consumption, serious equipment corrosion, large maintenance, and difficulty in expanding the production capacity of a single furnace.

Method used

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  • Method for producing potassium (sodium) sulfate at low temperature
  • Method for producing potassium (sodium) sulfate at low temperature

Examples

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Effect test

Embodiment 1

[0026] Example 1: A new method for low-temperature production of potassium sulfate (sodium), technical process reference figure 1 .

[0027] Potassium chloride with a content of 95% and industrial sulfuric acid with a concentration of 98% are put into the reaction kettle 1 under continuous stirring at a ratio of 1:1 according to the amount of substances, and the reaction temperature is controlled at 210°C, and the reaction is carried out for 50 minutes. After completion, the generated potassium hydrogen sulfate is atomized and sprayed into the aqueous solution in the reactor kettle 2, and ethanol is added to the solution until the ethanol concentration reaches 70% or more, and the solid and mother liquor are obtained by filtration. The solid was washed with an aqueous solution, dried at 110°C, and crushed to obtain the finished potassium sulfate. The above mother liquor is distilled and separated at a temperature of 110°C to obtain ethanol, water and sulfuric acid. The sulfur...

Embodiment 2

[0028] Embodiment 2: A new method for producing potassium sulfate (sodium) at low temperature.

[0029] Potassium chloride with a content of 95% and industrial sulfuric acid with a concentration of 93% are put into the reactor 1 under continuous stirring at a ratio of 0.8:1 according to the amount of substances, and the reaction temperature is controlled at 180°C, and the reaction is carried out for 50 minutes. After completion, the generated potassium hydrogen sulfate is atomized and sprayed into the aqueous solution in the reactor 2, methanol is added to the solution until the concentration of methanol reaches 70%, and the solid and mother liquor are obtained by filtration. The solid was washed with an aqueous solution, dried by heating at 120°C, and pulverized to obtain potassium sulfate. The above mother liquor is separated by vacuum distillation at 80°C to obtain alcohol, aqueous solution and sulfuric acid. Both sulfuric acid and alcohol are recycled, and water is used to...

Embodiment 3

[0030] Embodiment 3: A kind of new method of producing potassium sulfate (sodium) at low temperature.

[0031] The sodium chloride with a content of 99% and the industrial sulfuric acid with a concentration of 98% are put into the reaction kettle 1 under continuous stirring at a ratio of 0.85:1 according to the ratio of substances, and the reaction temperature is controlled at 180°C, and the reaction is carried out for 40 minutes. After completion, the generated sodium bisulfate is atomized and sprayed into the aqueous solution in the reaction kettle 2, ethanol is added to the solution until the ethanol concentration reaches 80%, and the solid and mother liquor are obtained by filtration. The solid was washed with aqueous solution and heated to obtain anhydrous sodium sulfate. The above mother liquor is separated by vacuum distillation at 80°C to obtain alcohol, aqueous solution and sulfuric acid. Both sulfuric acid and alcohol are recycled, and water is used to wash solid sod...

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Abstract

The invention discloses a method for producing potassium (sodium) sulfate at a low temperature. The method comprises the following steps: performing heating reaction between potassium (sodium) chloride and sulfuric acid to generate potassium (sodium) hydrogen sulfate and hydrogen chloride, adding potassium (sodium) hydrogen sulfate into water to obtain a water solution of potassium (sodium) hydrogen sulfate, adding alcohol into the water solution, decomposing to generate potassium (sodium) sulfate and sulfuric acid, performing the processes of centrifuging (filtering) separation, washing, drying and the like to obtain finished potassium (sodium) sulfate, and performing distillation recovery on mother liquid to obtain alcohol, a water solution and sulfuric acid which can be reused, wherein hydrogen chloride gas generated in the reaction is cooled, then is absorbed by water in an absorption tower to obtain hydrochloric acid, or is cooled and purified for other uses. Potassium (sodium) sulfate is prepared by adopting the method, the reaction temperature is low, the equipment corrosion is low, the reaction speed is very high, the needed time is short, the product quality is stable, and good comprehensive economic benefits are achieved.

Description

technical field [0001] The invention relates to a new method for producing potassium sulfate (sodium) at low temperature by using potassium chloride (sodium) and sulfuric acid as raw materials, and the technical field is inorganic salt industry and chemical fertilizer industry. Background technique [0002] Potassium sulfate is a kind of chlorine-free potassium fertilizer, which is mainly used in cash crops that avoid chlorine, such as vegetables, fruits, tobacco, tea and sericulture and other crops. In addition, potassium sulfate can also be used to produce industrial products such as potassium persulfate, alum, potassium silicate and potassium carbonate. Sodium sulfate, also known as anhydrous Glauber's salt, is used as a salting-out agent and coagulant in medicine, and is used in papermaking, glass, printing and dyeing, synthetic fiber, leather, etc. in industry, and is also used in the manufacture of shampoo and tableware cleaning agent , liquid detergent, etc., are wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/02C01B7/01
Inventor 柳仁民孙爱玲
Owner 柳仁民
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