A kind of method utilizing industrial by-product ammonium sulfate to produce potassium sulfate

A technology of ammonium sulfate and by-products, applied in the preparation of sulfate/bisulfate, etc., can solve the problems of high cost, difficult treatment of ammonium sulfate, complex production process of chemical fertilizer potassium sulfate, etc.

Inactive Publication Date: 2019-04-30
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for directly using the industrial by-product ammonium sulfate containing organic impurities to prepare chemical fertilizer potassium sulfate, so as to solve the problems that the ammonium sulfate containing organic impurities is difficult to handle, the production process of chemical fertilizer potassium sulfate is complex, and the cost is high

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  • A kind of method utilizing industrial by-product ammonium sulfate to produce potassium sulfate

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Embodiment 1

[0107] 2000kg of ammonium sulfate (a by-product of the preparation of methyl methacrylate, wherein the water content is 10%, containing 0.8% of organic impurities) and 2054kg of potassium chloride (purity 98.0%) are stirred and mixed, mixed for 2.0h, and put into a high-temperature reactor , at 400°C, roasted at 60rpm (stirring speed) for 2.0h, at the same time, feed 20°C air into the high temperature reactor, the air flow rate is 6m 3 / h, the solid product after roasting is recovered after being cooled by a potassium sulfate cooler, and the gaseous product after roasting is fixed through a gas trap, wherein the potassium sulfate product is calculated by the weight of potassium element, and the recovery rate of potassium is 98.5%. The purity of the obtained potassium sulfate is 98.7%, which meets agricultural needs; the ammonium chloride product is based on the weight of nitrogen, and the recovery rate of ammonium is 98%, and the purity of ammonium chloride is 98.0%. Compared ...

Embodiment 2

[0110] 2000kg of ammonium sulfate (a by-product of the preparation of methyl methacrylate, wherein the water content is 12%, containing 1.2% of organic impurities) and 1999kg of potassium chloride (purity 98.0%) are stirred and mixed, mixed for 1.5h, and put into a high-temperature reactor , at 420°C, roasting at 40rpm (stirring speed) for 3.0h, at the same time, feed 20°C air into the high temperature reactor, the air flow rate is 10m 3 / h, the solid product after roasting is recovered after being cooled by a potassium sulfate cooler, and the gaseous product after roasting is fixed through a gas trap, wherein the potassium sulfate product is calculated by the weight of potassium element, and the recovery rate of potassium is 98.8%. The purity of the obtained potassium sulfate is 98.5%, which meets agricultural needs; the ammonium chloride product is based on the weight of nitrogen, and the recovery rate of ammonium is 97.8%, and the purity of ammonium chloride is 98.4%. Calcul...

Embodiment 3

[0113] 2000kg of ammonium sulfate (a by-product of the preparation of methyl methacrylate, wherein the water content is 5%, containing 0.5% of organic impurities) and 2176kg of potassium chloride (purity 98.0%) are stirred and mixed, mixed for 1.5h, and put into a high-temperature reactor , at 300°C, roasting at 60rpm (stirring speed) for 2.5h, at the same time, feed 20°C air into the high temperature reactor, the air flow rate is 2m 3 / h, the solid product after roasting is recovered after being cooled by a potassium sulfate cooler, and the gaseous product after roasting is fixed through a gas trap, wherein the potassium sulfate product is calculated by the weight of potassium element, and the recovery rate of potassium is 98.9%. The purity of the obtained potassium sulfate is 98.0%, which meets agricultural needs; the ammonium chloride product is based on the weight of nitrogen, and the recovery rate of ammonium is 95.8%, and the purity of ammonium chloride is 98.2%. Compare...

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Abstract

The invention discloses a method for production of potassium sulfate from industrial by-product ammonium sulfate. The method directly uses the industrial by-product ammonium sulfate as the raw material to prepare potassium sulfate with potassium chloride by means of thermal double decomposition, wherein the industrial by-product ammonium sulfate contains a small amount of organic impurities and is obtained as a by-product generated in preparation of organic acid or ester compound by employing an organic nitrile compound or amide compound as the raw material and using sulfuric acid as the catalyst. According to the method provided by the invention, in a heating process of the raw materials, organic impurities in ammonium sulfate can burn and be removed. At the same time, the reaction system utilizes the heat released by organic impurities during burning to promote the thermal double decomposition reaction of ammonium sulfate and potassium chloride, thus reducing energy consumption of the preparation process. At the same time, the problems that ammonium sulfate containing organic impurities cannot be utilized and is difficultly discharged can be solved.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a method for producing potassium sulfate by utilizing ammonium sulfate, an industrial by-product. Background technique [0002] When organic nitrile compounds or amide compounds are used as raw materials and sulfuric acid is used as a catalyst to prepare organic acids or ester compounds, a large amount of ammonium sulfate or ammonium bisulfate will be produced by-product. In industry, the by-product ammonium bisulfate will also pass to The method of feeding ammonia into the system is converted into ammonium sulfate. However, the by-product ammonium sulfate obtained directly or indirectly will usually carry a small amount of organic impurities, and the by-product ammonium sulfate with impurities can be purified to obtain pure ammonium sulfate solids, although the purified ammonium sulfate can be used as agricultural fertilizers sales, but the purification process increases ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/08
CPCC01D5/08C01P2006/80
Inventor 王飞钟颜麟柳亚玲郑道敏姚如杰丁永良郑伯川宫晓川
Owner CHONGQING UNISPLENDOUR CHEM
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