Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for continuous production of urea phosphate by vacuum evaporation and crystallization

A technology of vacuum evaporation and urea phosphate, which is applied in the field of urea derivatives, can solve the problems of extended production cycle, increased production cost, and decreased heat exchange efficiency, and achieve the effects of shortened crystallization time, improved device production capacity, and less investment

Active Publication Date: 2015-09-09
WENGFU (GRP) CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for producing urea phosphate, mainly partition wall or coil cooling crystallization methods, which all belong to intermittent crystallization methods. In these methods, the crystallizers are preferentially precipitated on the inner wall of the crystallizer or the outer surface of the coil at a lower temperature. Thick crystal scale is formed on the inner wall or the outer surface of the coil, resulting in a decrease in heat transfer efficiency, slow cooling, and a long crystallization time (usually 6 to 10 hours), resulting in prolonged production cycle and decreased yield, and regular cleaning of crystal scale is required. removal, increased production costs

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
  • A method for continuous production of urea phosphate by vacuum evaporation and crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] like figure 1 As shown, P 2 o 5 Phosphoric acid with a mass percentage concentration of 40% was added to a 1000L jacketed reactor at 400Kg / h, and the stirring was started at a speed of 50rpm. At the same time, urea was added at 176Kg / h, the temperature was raised to 80°C, and the reaction was carried out for 40 minutes. The specific gravity of the material was 1.4 Kg / L, the feed liquid overflows to the 1000L buffer tank, starts stirring at a speed of 50rpm, and cools down to 70°C through the jacket condensing medium of the buffer tank, enters the first-stage vacuum evaporative cooling crystallizer for crystallization, and the stirring speed is 20rpm, The vacuum degree is 0.06MPa, the material temperature drops to 58°C, and then enters the second-stage vacuum evaporative cooling crystallizer for crystallization, the stirring speed is 20rpm, the vacuum degree is 0.07MPa, the material temperature drops to 48°C, and finally enters the third-stage vacuum The evaporative co...

Embodiment 2

[0016] like figure 1 As shown, P 2 o 5 Phosphoric acid with a mass percentage concentration of 44% was added to a 1000L jacketed reactor at 400Kg / h, and the stirring was started at a speed of 50rpm. At the same time, urea was added at 178Kg / h, the temperature was raised to 85°C, and the reaction was carried out for 50 minutes. The specific gravity of the material was 1.43 Kg / L, the feed liquid overflows to the 1000L buffer tank, starts stirring at a speed of 50rpm, and cools down to 75°C through the jacketed condensing medium of the buffer tank, enters the first-stage vacuum evaporative cooling crystallizer for crystallization, and the stirring speed is 30rpm, The vacuum degree is 0.065MPa, the material temperature drops to 63°C, and then enters the second-stage vacuum evaporative cooling crystallizer for crystallization, the stirring speed is 30rpm, the vacuum degree is 0.075MPa, the material temperature drops to 53°C, and finally enters the third-stage vacuum The evaporati...

Embodiment 3

[0018] like figure 1 As shown, P 2 o 5 Phosphoric acid with a mass percentage concentration of 55% was added to a 1000L jacketed reactor at 400Kg / h, and the stirring was started at a speed of 55rpm. At the same time, urea was added at 204Kg / h, the temperature was raised to 85°C, and the reaction was carried out for 60 minutes. The specific gravity of the material was 1.53 Kg / L, the feed liquid overflows to the 1000L buffer tank, starts stirring at a speed of 55pm, and cools down to 75°C through the buffer tank jacket condensing medium, enters the first-stage vacuum evaporative cooling crystallizer for crystallization, and the stirring speed is 40rpm, The vacuum degree is 0.07MPa, the material temperature drops to 63°C, and then enters the second-stage vacuum evaporative cooling crystallizer for crystallization, the stirring speed is 40rpm, the vacuum degree is 0.08MPa, the material temperature drops to 53°C, and finally enters the third-stage vacuum The evaporative cooling c...

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 method for continuously producing urea phosphate by vacuum evaporation crystallization. The method comprises the following steps: (1) by using phosphoric acid containing 40-61.9 wt% of P2O5 and urea as raw materials, continuously adding the phosphoric acid and urea into a jacket reactor in a mole ratio of 1:(1.0-1.3), stirring to react, heating to 80-90 DEG C, reacting for 40-70 minutes, cooling the material (the specific gravity is 1.4-1.6 Kg / L) to 70-80 DEG C in a buffer tank, crystallizing the material in a multistage cascade vacuum evaporation cooling crystallizer, separating the crystallizing solution, and drying to obtain the urea phosphate, wherein part of the separated mother solution returns to the jacket reactor, and the rest is used for producing the wood flame retardant or fertilizer. The method implements continuous crystallization operation, solves the problem of crystal scales in the crystallization process, and has the advantages of short crystallization time, high product yield, simple technique, low energy consumption and low investment.

Description

technical field [0001] The invention relates to urea derivatives, in particular to a method for continuous production of urea phosphate by vacuum evaporation and crystallization. Background technique [0002] Urea phosphate is a coordination complex compound with amino structure formed by the reaction of phosphoric acid and urea. It is a fine chemical product widely used in animal husbandry, agriculture, industry and other fields. It is an excellent feed additive that provides two nutrients, phosphorus and non-protein nitrogen (urea nitrogen) for livestock; it is also a high-concentration nitrogen-phosphorus compound fertilizer, suitable for alkaline soil, and is used in some areas of China for urea phosphate Tests on solid fertilizers have proved that: urea phosphate has a good effect on the growth of crops, not only can ensure the normal growth of plants, but also has no negative impact on the soil; urea phosphate can also be used as an intermediate of ammonium polyphospha...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C275/02C07C273/02
CPCY02P20/50
Inventor 刘飞解田史连军杨丽萍
Owner WENGFU (GRP) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com