Microwave radiation process for producing potassium sulfate

A technology of microwave radiation and potassium sulfate is applied in the field of inorganic salt industry and chemical fertilizer industry to achieve the effect of accelerating the reaction speed and shortening the reaction time

Inactive Publication Date: 2007-11-07
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Microwave radiation reaction technology has the advantages of fast speed, uniformity, selectivity, and no hysteresis effect. It is also highly efficient, energy-saving, and does not pollute the environment. It has attracted the attention of chemical, chemical and environmental scientists, but microwave radiation has not been used in the production of potassium sulfate. see the report

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  • Microwave radiation process for producing potassium sulfate

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Experimental program
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Effect test

Embodiment 1

[0011] Potassium chloride with a content of 95% and industrial sulfuric acid with a concentration of 98% are dropped into a microwave reactor at a ratio of 0.85:0.57 by weight, and reacted with 2450MHz microwave radiation under continuous stirring, and the reaction temperature is controlled at 400°C. Radiation time is about 50 minutes. After the reaction is completed, the solid product is cooled and pulverized to obtain the finished potassium sulfate, and the hydrogen chloride gas generated by the reaction is cooled and then absorbed with water to obtain a hydrochloric acid by-product with a concentration of 31%.

Embodiment 2

[0013] Put potassium chloride with a content of 95% and industrial sulfuric acid with a concentration of 93% into a microwave reactor in a ratio of 0.85:0.60 by weight, under continuous stirring, react with 4450MHz microwave radiation, and the reaction temperature is controlled at 800°C. The radiation time is about 40 minutes. After the reaction is completed, the solid product is cooled and pulverized to obtain the finished potassium sulfate. The hydrogen chloride gas generated by the reaction was cooled and absorbed with water to obtain a hydrochloric acid by-product with a concentration of 31%.

Embodiment 3

[0015] The potassium chloride with a content of 95% and the industrial sulfuric acid with a concentration of 98% are dropped into a microwave reactor in a ratio of 0.90:0.60 by weight, and reacted with 5000MHz microwave radiation under continuous stirring, and the reaction temperature is controlled at 700°C. Radiation time is about 45 minutes. After the reaction is completed, the solid product is cooled and pulverized to obtain the finished potassium sulfate. The hydrogen chloride gas generated by the reaction was cooled and absorbed with water to obtain a hydrochloric acid by-product with a concentration of 31%.

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Abstract

The present invention relates to new microwave radiation process for producing potassium sulfate. The process includes the following steps: mixing potassium chloride and industrial sulfuric acid in certain weight ratio in an anticorrosive reactor, radiating with 600-50,000 MHz microwave while stirring to react at 400-800 deg.c for 5-60 min to produce potassium sulfate, cooling and crushing to obtain potassium sulfate product, and cooling the produced hydrogen chloride gas and absorbing with water in an absorbing tower to produce hydrochloric acid as the side product. Compared with available technology, the present invention has the advantages of high reaction speed, short production period, high product quality, no environmental pollution, etc.

Description

1. Technical field [0001] The invention relates to a new method for producing potassium sulfate and hydrogen chloride by adopting microwave radiation and using potassium chloride and sulfuric acid as raw materials. The technical field is inorganic salt industry and chemical fertilizer industry. 2. Background technology [0002] Potassium sulfate is a kind of chlorine-free potassium fertilizer, in which the content of potassium oxide is more than 50%, and the content of sulfur is more than 18%. At present, potassium sulfate is widely used in agriculture and is mainly used in economic 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. [0003] At present, potassium chloride and sulfuric acid are used as raw materials to produce potassium sulfate: Mannheim method, Chisso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/02C01B7/03C05D1/02
Inventor 孙爱玲柳仁民
Owner LIAOCHENG UNIV
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