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Potassium nitrate preparing technology

A preparation process, the technology of potassium nitrate, applied in the field of potassium nitrate preparation process, can solve the problems of raw material source limitation, poor product quality, high production cost, etc., and achieve the effect of reducing washing finished products, reducing cost, and not easy to agglomerate

Inactive Publication Date: 2007-11-14
上海文通化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of limited source of raw materials, high production cost, high energy consumption and poor product quality in the existing potassium nitrate preparation method, the present invention provides a potassium nitrate preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The potassium nitrate preparation process comprises the following steps: (1) mixing potassium chloride and dilute nitric acid with a concentration of 20% according to a molar ratio of 1: 1.05, reacting under normal pressure and a temperature of 60°C, Generate a mixed solution containing potassium chloride, dilute nitric acid, potassium nitrate and hydrochloric acid; (2) distill the mixed solution obtained above at a temperature of 80° C., separate hydrochloric acid containing nitric acid, and obtain a crude potassium solution; ( 3) Continue heating the thick potassium solution obtained above to 95° C., concentrate to obtain a thick saturated potassium solution, then add sodium carbonate to neutralize the saturated solution to be neutral, while sodium carbonate reacts with hydrochloric acid to generate sodium chloride; (4 ) the mixed solution obtained in the step (3) is concentrated under the condition of 120° C., when the potassium nitrate content in the supersaturated s...

Embodiment 2

[0025] The potassium nitrate preparation process comprises the following steps: (1) mixing potassium chloride and dilute nitric acid with a concentration of 40% according to a molar ratio of 1: 1.4, reacting under normal pressure and a temperature of 90°C, Generate a mixed solution containing potassium chloride, dilute nitric acid, potassium nitrate and hydrochloric acid; (2) distill the mixed solution obtained above at a temperature of 95° C., separate hydrochloric acid containing nitric acid, and obtain a crude potassium solution; ( 3) Continue heating the thick potassium solution obtained above to 110° C., concentrate to obtain a thick saturated potassium solution, then add sodium carbonate to neutralize the saturated solution to be neutral, while sodium carbonate reacts with hydrochloric acid to generate sodium chloride; (4 ) Concentrating the mixed solution obtained in step (3) at a temperature of 130°C, when the potassium nitrate content in the supersaturated solution rea...

Embodiment 3

[0027] The potassium nitrate preparation process comprises the following steps: (1) mixing potassium chloride and dilute nitric acid with a concentration of 30% according to a molar ratio of 1: 1.2, reacting under normal pressure and a temperature of 70°C, Generate a mixed solution containing potassium chloride, dilute nitric acid, potassium nitrate and hydrochloric acid; (2) distill the mixed solution obtained above at a temperature of 85° C., separate hydrochloric acid containing nitric acid, and obtain a crude potassium solution; ( 3) Continue heating the thick potassium solution obtained above to 105° C., concentrate to obtain a thick saturated potassium solution, then add sodium carbonate to neutralize the saturated solution, and react sodium carbonate with hydrochloric acid to generate sodium chloride simultaneously; (4 ) the mixed solution obtained in step (3) is concentrated under the condition of 125° C., when the potassium nitrate content in the supersaturated solutio...

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Abstract

The invention relates to a kind of technique field of inorganic chemical industry, which is a kind of preparation craft of niter. To solve such problems existing preparation craft of niter as that sources of raw material is restricted, production cost and energy consumption is high and quality of products is inferior, the invention uses potassium chloride and dilute nitric acid react to form potassium chloride, dilute nitric acid, niter and hydrochloric acid, take a great of hydrochloric acid and nitric acid out through distillation, then heat and concentrate them to make the mixture turn into saturated solution which becomes neutral when put into sodium carbonate and regulated, the solution reacts with surplus little hydrochloric acid and form sodium chloride at the same time. Finally, it separates niter out making use of different solubility of niter, sodium chloride and potassium chloride at the same temperature. Sources of raw material in this invention are extensive, the production cost is relatively low; Operations such as chemistry reaction, distillation and concentration are finished at the same reaction equipment, process of operation goes on under normal atmosphere and save investment of equipment; it is easy to operate and separate; get finished product using method of mechanism filter-pressing, it is simple to operate with little investment.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a preparation process of potassium nitrate. Background technique [0002] Potassium nitrate is one of the main products of potassium salt products. In industry, it is mainly used in fireworks, black powder, optical glass, special glass and other fields. In agriculture, it is fertilizer grade potassium nitrate or agricultural potassium nitrate, which is a high-quality Potassium nitrogen binary compound fertilizer, containing more than 44% potassium oxide and more than 13% nitrogen, all of which are soluble nutrients, can be completely absorbed by crops, and are mainly used in tobacco, economic crops, horticulture and other fields, which can significantly increase the yield of crops It is one of the high-efficiency chemical fertilizer varieties needed for the development of high-efficiency and high-quality agriculture. [0003] After the development of potassiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/08C01D9/16
Inventor 武一李刚王维泽梁永祥石砚池李宝玉闫瑞禄李建陆
Owner 上海文通化工有限公司
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