Method for producing potassium sulfate or sodium sulfate by potassium chloride or sodium chloride and sulfuric acid

A technology of potassium chloride and potassium 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: 2014-11-19
张秀贞
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  • 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 sulfate or sodium sulfate by potassium chloride or sodium chloride and sulfuric acid

Examples

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Effect test

Embodiment 1

[0024] Example 1: A new method for producing potassium sulfate (sodium) using potassium chloride (sodium) and sulfuric acid as raw materials, technical process reference figure 1 .

[0025] Put potassium chloride (sodium) with a content of 95% and industrial sulfuric acid with a concentration of 98% according to the ratio of 1:1, and put them into the reactor under continuous stirring. The reaction temperature is controlled at 220°C, and the reaction is carried out for 30 minutes. , Potassium bisulfate (sodium) generated after the reaction is completed is atomized and sprayed into 70% ethanol aqueous solution, and filtered to obtain solid and mother liquor. The solid was washed with 70% ethanol aqueous solution, dried at 110°C, and crushed to obtain the finished potassium sulfate (sodium). The above mother liquor is distilled and separated at a temperature of 110°C to obtain alcoholic aqueous solution and sulfuric acid. The sulfuric acid is recycled and the alcoholic aqueous ...

Embodiment 2

[0026] Embodiment two: adopt potassium chloride (sodium) and sulfuric acid to be the new method of raw material production potassium sulfate (sodium)

[0027] Put potassium chloride (sodium) with a content of 95% and industrial sulfuric acid with a concentration of 98% according to the ratio of 0.9:1, and put them into the reactor under continuous stirring. The reaction temperature is controlled at 210°C, and the reaction is carried out for 30 minutes. , Potassium bisulfate (sodium) generated after the reaction is completed is atomized and sprayed into 70% ethanol aqueous solution, and filtered to obtain solid and mother liquor. The solid was washed with 70% ethanol aqueous solution, dried at 130°C, and crushed to obtain the finished potassium sulfate (sodium). The above mother liquor is separated by vacuum distillation at 80°C to obtain alcoholic aqueous solution and sulfuric acid. The sulfuric acid is recycled and the alcoholic aqueous solution is recycled or used to wash so...

Embodiment 3

[0028] Embodiment three: adopt potassium chloride (sodium) and sulfuric acid to be the new method of raw material production potassium sulfate (sodium)

[0029] Put potassium chloride (sodium) with a content of 95% and industrial sulfuric acid with a concentration of 93% according to the ratio of 0.8:1, and put them into the reactor under continuous stirring. The reaction temperature is controlled at 180°C and reacted for 30 minutes. , Potassium bisulfate (sodium) generated after the reaction is completed is atomized and sprayed into 80% ethanol aqueous solution, and filtered to obtain solid and mother liquor. The solid was washed with 80% ethanol aqueous solution, dried at 120°C, and crushed to obtain the finished potassium sulfate (sodium). The above mother liquor is distilled and separated at a temperature of 105°C to obtain alcoholic aqueous solution and sulfuric acid. The sulfuric acid is recycled and the alcoholic aqueous solution is recycled or used to wash solid potass...

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Abstract

The invention discloses a novel method for producing potassium sulfate or sodium sulfate by potassium chloride or sodium chloride and sulfuric acid. According to the method, potassium chloride or sodium chloride and sulfuric acid react under heating to produce potassium sulfate or sodium sulfa and hydrogen chloride, potassium hydrogen sulfate or sodium hydrogen sulfate is degraded by an alcohol-water solution to produce potassium sulfate or sodium sulfate and sulfuric acid, a product is subjected to procedures such as centrifugal separation or centrifugal filtration, washing, drying and the like to obtain a finished product of potassium sulfate or sodium sulfate, and a mother solution is distilled and recovered to obtain an alcohol-water solution and sulfuric acid which are returned for recycling; and hydrogen chloride gas produced by the reaction is cooled, enters an absorption tower and is absorbed by water to prepare hydrochloric acid, or is cooled and purified for other application. When the method is used for preparing potassium sulfate or sodium sulfate, the reaction temperature is low, the equipment corrosion is weak, the reaction speed is high, short time is required, the product quality is stable, and a good comprehensive economic benefit is provided.

Description

technical field [0001] The invention relates to a method for producing potassium sulfate (sodium) 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 widely used. The main pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/02C01B7/01
Inventor 张秀贞
Owner 张秀贞
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