Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for industrially and continuously producing crystalline urea

A urea and crystal technology, applied in urea compound fertilizer, agriculture, nitrogen fertilizer, etc., can solve the problems of strong hygroscopicity, inconvenient use, easy moisture absorption, etc., achieve the effects of not easy to absorb moisture, easy to purchase raw materials, and improve production efficiency

Inactive Publication Date: 2012-07-04
广西力源肥业科技农化有限公司
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common granular urea on the market is highly hygroscopic, easy to absorb moisture, and hardened, which brings inconvenience to use.

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
  • Method for industrially and continuously producing crystalline urea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Dissolve ultrapure water and urea in 10 reaction kettles at a molar ratio of 1:1.5, each reaction kettle is heated by heat conduction oil partition heating method, and the heating temperature of the reaction kettle is controlled at 60°C, keeping The reaction solution was stirred continuously to make it heated evenly.

[0035] (2) When heating until the urea is nearly dissolved completely, directly add industrial sulfuric acid with a volume concentration of 98% to adjust the pH=4, and keep until the urea dissolves completely.

[0036] (3) The solution in the reaction kettle is evenly heated, and finally melts into a saturated urea slurry. The slurry is discharged from the lower outlet of the reaction kettle to the crystallizer, and when it is cooled to 45°C by the cooling system, it is fully stirred evenly, and finally cooled to room temperature After obtaining urea crystals, after solid-liquid separation, the solution can be temporarily stored in the mother liquor t...

Embodiment 2

[0038] (1) Dissolve urea and ultrapure water in 5 reactors at a molar ratio of 1:1.8, and each reactor is heated by a heat transfer oil partition heating method, and the heating temperature of the reactor is controlled at 80°C. The reaction solution was stirred continuously to make it heated evenly.

[0039] (2) When heating until the urea is almost completely dissolved, directly add zinc sulfate solution to adjust the pH value to 6.5, and keep until the urea is completely dissolved.

[0040] (3) The solution in the reaction kettle is evenly heated, and finally melts into a saturated urea slurry. The slurry is discharged from the lower outlet of the reaction kettle to the crystallizer, and when it is cooled to 45°C by the cooling system, it is fully stirred evenly, and finally cooled to room temperature After obtaining urea crystals, after solid-liquid separation, the solution can be temporarily stored in the mother liquor tank, and then circulated back to the reactor; the sep...

Embodiment 3

[0042] (1) Put ultrapure water and urea into 6 reaction kettles according to the molar ratio of 1:2 to dissolve respectively, each reaction kettle is all dissolved in the reaction kettle, adopt steam heating method to heat the reaction kettle, and the reaction kettle heating temperature is controlled at 80°C, keep stirring the reaction solution to make it heated evenly.

[0043] (2) When heating until the urea dissolves completely, directly add industrial phosphoric acid with a volume concentration of 85% to adjust the pH=5, and keep until the urea dissolves completely.

[0044] (3) The solution in the reaction kettle is evenly heated, and finally melts into a saturated urea slurry. The slurry is discharged from the lower outlet of the reaction kettle to the crystallizer, and when it is cooled to 45°C by the cooling system, it is fully stirred evenly, and finally cooled to room temperature After obtaining urea crystals, after solid-liquid separation, the solution can be tempor...

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 industrially and continuously producing crystalline urea. The method comprises the following steps of: heating and dissolving super pure water and granular urea in a reaction kettle according to a molar ratio of 1:1.5-2; controlling temperature to be 60-90 DEG C; adding an acidic preparation at the right moment to adjust the pH value to be 1-8; and finally cooling, crystallizing, drying and sieving to obtain industrial and agricultural urea crystal of which the service performance is superior to the conventional GB2440-2001 standard. The method has the advantages of simple process flow and convenience in raw material purchasing; the prepared product is crystalline and difficult to become damp and harden; and a plurality of reaction kettles and crystallizers can be arranged on the same production line to realize continuous production without interruption, so that the production efficiency is increased.

Description

technical field [0001] The invention relates to a production method of crystalline urea, in particular to a method for industrialized continuous production of crystalline urea. Background technique [0002] Urea is an organic nitrogen fertilizer that plays an important role in agricultural production and has made great contributions to increasing agricultural production and income in my country. [0003] Drip irrigation and fertilization technology has entered the stage of technology promotion in my country. However, the research and development of drip irrigation fertilizers is relatively lagging behind. Many companies choose water-soluble raw materials for compounding to produce drip irrigation fertilizers. As an important raw material, agricultural potassium nitrate has high nitrogen content and potassium element, good water solubility, and fast fertilizer efficiency. Although it is expensive, it was mostly used in previous facility agricultural production. However, nitr...

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 Applications(China)
IPC IPC(8): C05C9/00
Inventor 邓秀峰潘广珍龙谢远韦荣璋黄浦陈开全
Owner 广西力源肥业科技农化有限公司