Production process of potassium carbonate

A production process, potassium carbonate technology, applied in the direction of carbonate preparations, etc., can solve the problems of multiple processes, low energy consumption, high energy consumption, etc., and achieve the effects of simplified process steps, lower evaporation temperature, and lower evaporation temperature

Inactive Publication Date: 2009-07-15
ZHEJIANG DAYANG BIOTECH GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention mainly provides a potassium carbonate production process with low energy consumption, saves the carbonization process, has

Method used

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  • Production process of potassium carbonate
  • Production process of potassium carbonate

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Embodiment

[0022] Such as figure 1 Shown, a kind of preparation method of potassium carbonate, adopts 732 type strongly acidic cation exchange resins with potassium chloride as regeneration agent, makes eluting agent with ammonium bicarbonate, utilizes ion exchange method to obtain the mixed solution of potassium bicarbonate and ammonium bicarbonate and ammonium chloride solution.

[0023] The mixed diluted solution is evaporated at a negative pressure of 0.7Mpa and an evaporation temperature of 85°C. Since the decomposition temperature of ammonium bicarbonate is lower than that of potassium bicarbonate, only a small amount of potassium bicarbonate is converted into potassium carbonate during the evaporation process, while CO released from ammonium bicarbonate 2 The carbonization process of potassium carbonate can be completely realized, and the evaporation self-carbonization process is completed. The ammonia-containing distilled water after evaporation and self-carbonization is returne...

Embodiment 2

[0026] Such as figure 1 Shown, a kind of preparation method of potassium carbonate, adopts 732 type strongly acidic cation exchange resins with potassium chloride as regeneration agent, makes eluting agent with ammonium bicarbonate, utilizes ion exchange method to obtain the mixed solution of potassium bicarbonate and ammonium bicarbonate and ammonium chloride solution. Evaporate the mixed solution at a negative pressure of 0.6Mpa and an evaporation temperature of 75°C. Since the decomposition temperature of ammonium bicarbonate is lower than that of potassium bicarbonate, only a small amount of potassium bicarbonate is converted into potassium carbonate during the evaporation process, while the carbonic acid CO released from ammonium hydrogen 2 The carbonization process of potassium carbonate can be fully realized, and the evaporation self-carbonization process can be completed. All the other are the same with embodiment 1.

Embodiment 3

[0028] Such as figure 1 Shown, a kind of preparation method of potassium carbonate, adopts 732 type strongly acidic cation exchange resins with potassium chloride as regeneration agent, makes eluting agent with ammonium bicarbonate, utilizes ion exchange method to obtain the mixed solution of potassium bicarbonate and ammonium bicarbonate and ammonium chloride solution. Evaporate the mixed solution at a negative pressure of 0.8Mpa and an evaporation temperature of 90°C. Since the decomposition temperature of ammonium bicarbonate is lower than that of potassium bicarbonate, only a small amount of potassium bicarbonate is converted into potassium carbonate during the evaporation process, while carbonate CO released from ammonium hydrogen 2 The carbonization process of potassium carbonate can be fully realized, and the evaporation self-carbonization process can be completed. All the other are the same with embodiment 1.

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Abstract

The invention relates to a potassic carbonate, in particular to a technique for producing potassium carbonate. The method comprises the following steps: evaporating a mixed solution at a low temperature and pressure after the ion exchange process is performed to ammonium hydrogen carbonate and potassium chloride so that only a small amount of potassium bicarbonate is converted to potassium carbonate. Therefore, CO2 given out by decomposing ammonium hydrogen carbonate in the pressure reducing and evaporating process can realize the carbonization of the potassium carbonate, thereby the carbonization process is saved, the low temperature self-carbonizing production technique is realized, the energy consumption is reduced, the coal consumption is reduced to 1.3 tons from 1.8 tons in the traditional technique, the electricity consumption is reduced to 270KW/h from 450KW/h, the consumption of the main materials of the potassium chloride and the ammonium hydrogen carbonate per ton are reduced to 1.153 and 1.335 tons from 1.25 and 1.60 tons respectively, and the corrosion of the equipment is reduced.

Description

technical field [0001] The invention relates to a potassium carbonate, in particular to a production process of potassium carbonate. Background technique [0002] Currently, the production of potassium carbonate (K 2 CO 3 ) methods mainly include electrolysis and ion exchange resin method. Although the products prepared by the electrolysis method are of high quality and pollution-free, the equipment requirements are high, the power consumption is large, and the cost is high. The Chinese invention patent application with the publication number CN1092379 provides a process and equipment for preparing potassium carbonate. The powder or grinding material in the potassium carbonate calcined product or hydrate preparation device is added to the wet segregated salt after crystallization and solid separation and mixed. Stirrers with or without mixture circulation are installed between the solids classification of the separated salts and the inlet of the calcined and hydrate prepa...

Claims

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Application Information

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IPC IPC(8): C01D7/12
Inventor 汪贤玉钱雪明
Owner ZHEJIANG DAYANG BIOTECH GROUP
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