Continuous system and method for producing potassium nitrate through double decomposition method

A metathesis method and potassium nitrate technology, applied in the field of chemical production, can solve the problems of difficulty in overcoming the viscosity of the second-effect material, high primary crystallization temperature control, low product yield, etc., so as to reduce scaling phenomenon, save production time, and reduce concentration effect of temperature

Active Publication Date: 2015-01-07
KINGENTA ECOLOGICAL ENG GRP
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly has the following defects: 1. the primary crystallization temperature is controlled high, and the product yield is low
②Mix the mother liquor after primary crystallization and separation with ammonium nitrate, and then use co-current double-effect evaporation to concentrate, but it is difficult to overcome the problem of the high viscosity of the second-effect material and the decrease in heat transfer coefficient caused by the decline in the production capacity of the evaporation device
③ This method adopts conventional cooling method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Continuous system and method for producing potassium nitrate through double decomposition method
  • Continuous system and method for producing potassium nitrate through double decomposition method
  • Continuous system and method for producing potassium nitrate through double decomposition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A system for producing potassium nitrate by continuous metathesis, comprising a primary dissolution tank, a potassium nitrate vacuum crystallization device, a primary thickener, a primary centrifuge, a washing tank, a secondary dissolution tank, a filter, a primary vacuum continuous crystallizer, a secondary Secondary thickener, secondary centrifuge, mixing tank, concentration preheater, countercurrent three-effect concentration device, secondary vacuum continuous crystallizer, tertiary thickener, tertiary centrifuge; the outlet of the primary dissolution tank It is connected with the feed port of the potassium nitrate vacuum crystallization device, the discharge port of the potassium nitrate vacuum crystallization device is connected with the feed port of the primary thickener, and the discharge port of the primary thickener is connected with the feed port of the primary centrifuge. The solid discharge port of the primary centrifuge is connected with the feed port of th...

Embodiment 2

[0057]Add ammonium chloride mother liquor, water and potassium chloride to the primary dissolution tank, so that the ratio of ammonium ions and chloride ions is 1:1, heat it to 75°C with steam and stir to dissolve it completely, and the feed liquid enters the sixth stage of potassium nitrate in sequence In the series vacuum crystallization device, by controlling the pressure of the vacuum system at all levels, the temperature in the first-stage crystallizer A1 is controlled to 70°C, the temperature in the second-stage crystallizer A2 is 55°C, the temperature in the third-stage crystallizer A3 is 42°C, and the temperature in the fourth-stage crystallizer The temperature in the device A4 is 35°C, the temperature in the fifth-stage crystallizer A5 is 25°C, and the temperature in the sixth-stage crystallizer A6 is 15°C. The material in the sixth-stage crystallizer A6 is pumped to the primary thickener and primary centrifuge through the sixth-stage discharge pump D6, and the crude p...

Embodiment 3

[0060] Add ammonium chloride mother liquor, water and potassium chloride to the primary dissolution tank, so that the ratio of ammonium ions and chloride ions is 1:1.1, heat to 80°C with steam and stir to dissolve completely, and the feed liquid enters the sixth stage of potassium nitrate in sequence In the series vacuum crystallization device, by controlling the pressure of the vacuum system at all levels, the temperature in the first-stage crystallizer A1 is controlled to 75°C, the temperature in the second-stage crystallizer A2 is 60°C, the temperature in the third-stage crystallizer A3 is 45°C, and the temperature in the fourth-stage crystallizer The temperature in the device A4 is 38°C, the temperature in the fifth stage crystallizer A5 is 30°C, and the temperature in the sixth stage crystallizer A6 is 20°C. The material in the sixth-stage crystallizer A6 is pumped to the primary thickener and primary centrifuge through the sixth-stage discharge pump D6, and the crude pota...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a continuous system and method for producing potassium nitrate through a double decomposition method. The system comprises a primary dissolving tank, a potassium nitrate vacuum crystallization device, a primary thickener, a primary centrifuge, a washing tank, a secondary dissolving tank, a filter, a primary continuous vacuum crystallizer, a secondary thickener, a secondary centrifuge, a material mixing tank, a concentrating preheating device, a backflow triple-effect concentrating device, a secondary continuous vacuum crystallizer, a three-stage thickener and a three-stage centrifuge. Through the continuous system and the method, the production capacity is expanded, the labor intensity is reduced and the production efficiency of a potassium nitrate producing process is improved.

Description

technical field [0001] The invention relates to a system and a method for producing potassium nitrate by a continuous metathesis method, belonging to the technical field of chemical production. Background technique [0002] Domestic double decomposition method to produce potassium nitrate mainly adopts sodium nitrate-potassium chloride method and ammonium nitrate-potassium chloride method. The raw material price of the former is higher, and the economic value of the by-product sodium chloride is lower. The ammonium nitrate-potassium chloride double decomposition process is widely used, and the four-step circulation method is the main method: add water and potassium chloride to the circulating mother liquor, and when the temperature drops, potassium nitrate crystallizes out. Add ammonium nitrate to the mother liquor, and then evaporate and concentrate, then cool and crystallize to precipitate ammonium chloride crystals. The separated mother liquor is returned as circulating...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01D9/08C01C1/16
CPCC01D9/10
Inventor 于南树连新平郭宗端邹士龙
Owner KINGENTA ECOLOGICAL ENG GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap