A urea granulation process without adding formaldehyde

A urea granulation technology that does not need to be added. It is applied in the direction of urea compound fertilizer, separation of dispersed particles, liquid into beads and granulation, etc. It can solve the problems of secondary pollution hazards and loss, and achieve environmental protection and safety in the production process. Production cost Low, effective storage and application
CN106984243BActive Publication Date: 2021-07-16CASALE SA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CASALE SA
Publication Date
2021-07-16

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Abstract

The invention relates to a urea granulation process without adding formaldehyde. When producing large granules of formaldehyde-free urea, 75-99% (wt) urea solution is sent to a granulator without adding formaldehyde solution, and is granulated by an atomized fluidized bed granulation process, and is obtained after drying and cooling Large granular urea. The air containing urea dust discharged during the production process is treated with dry and wet dust removal methods under normal temperature and pressure. The nitrogen content of the formaldehyde-free large-grain urea obtained by the present invention can be as high as 46.5%, which is superior to the national urea standard (GB2440-2001) for high-grade products, can completely meet the industrial and agricultural uses at the same time, and can be directly used for vehicle urea. And the particles are large, uniform, low biuret content, high particle strength, good fluidity, not easy to break and not agglomerate, easy to store and apply.
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Description

technical field

[0001] The invention relates to the field of urea granulation production, in particular to a urea granulation process without adding formaldehyde. Background technique

[0002] At present, solid urea, which is synthesized from ammonia and carbon dioxide, is the most important type of nitrogen fertilizer, and it is widely used in agricultural production as fertilizer.

[0003] The process methods for producing large particle urea mainly include: Hydro company (HYDRO) and Toyo Engineering Company (TEC) fluidized bed granulation process. The former is an atomized fluidized bed, and the latter is a jet fluidized bed. During the granulation process, formaldehyde solution or urea aldehyde compound formed by the reaction of formaldehyde and urea solution is added.

[0004] The production process of large granular urea in Hydro company see figure 2 : The raw material urea solution with a concentration of 95% (wt) is sent to the granulator 202 through the granulatio...

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
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