A process for producing urea-formaldehyde slow-release fertilizer and co-production of alginic acid liquid fertilizer

A urea-formaldehyde and slow-release fertilizer technology, applied in nitrogen fertilizers, organic fertilizers, fertilization devices, etc., can solve the problems of increasing the difficulty of sewage treatment, long production cycle, cumbersome operation, etc., to improve photosynthetic utilization rate, short reaction time, and operation simple effect

Active Publication Date: 2017-01-25
WUZHOUFENG AGRI SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional urea-formaldehyde slow-release fertilizer production process has the disadvantages of cumbersome operation and long production cycle
[0003] On the other hand, in the traditional urea-formaldehyde slow-release fertilizer production process, especially in the solid fertilizer production process, the liquid material produced by pressure filtration and concentration is generally discharged out of the system, which not only causes waste of resources, but also increases the difficulty of sewage treatment

Method used

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  • A process for producing urea-formaldehyde slow-release fertilizer and co-production of alginic acid liquid fertilizer
  • A process for producing urea-formaldehyde slow-release fertilizer and co-production of alginic acid liquid fertilizer
  • A process for producing urea-formaldehyde slow-release fertilizer and co-production of alginic acid liquid fertilizer

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with embodiment.

[0022] Examples of preparation of seaweed extract:

[0023] 1) Dried seaweed is crushed and soaked at room temperature for 3-5 hours, then added potassium citrate with a weight of 1.5% of dry seaweed to soften and digest for 3-5 hours, and then centrifuged to obtain seaweed residue and seaweed solution;

[0024] 2) Add water with 40% quality of seaweed residue to the seaweed residue, adjust the pH value to 7.5; add microorganisms to the seaweed residue according to the mass ratio of seaweed filter residue, microbial strain, and culture medium of 100:15:20 Bacteria and culture medium, fermented at 30-32°C for 5 days, and then centrifuged to obtain a fermentation solution; the microbial strain is a mixture of lactic acid bacteria and yeast in a mass ratio of 1:1;

[0025] 3) Mix the seaweed solution prepared in step 1) and the fermentation solution prepared in step 2) evenly, and let ...

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Abstract

The invention discloses a process for producing an ureaformaldehyde slow release fertilizer with co-production of an alginic acid liquid fertilizer. The process comprises the following steps: raising the temperature to 70-80 DEG C and adding part of urea and formaldehyde; raising the temperature to about 62-68 DEG C under the condition that the pH is 4.4-4.6 and inputting the balance of urea to react for 30-90 minutes, kalifying to adjust the pH to about 8 and finishing reaction; pumping materials into a filter press to extrude and drying the dry materials to obtain ureaformaldehyde; and adding a seaweed extract into a filter press liquid and uniformly stirring to obtain the alginic acid liquid fertilizer. The ureaformaldehyde slow release fertilizer production process disclosed by the invention adopts a one-step method under an acid condition that the pH is 4.4-4.6 to prepare ureaformaldehyde and by virtue of a unique method of improving the pH value to about 8 after reaction, the process is simple to operate and short in reaction time, so that the production cycle is greatly shortened and the production efficiency is improved.

Description

technical field [0001] The invention relates to a production process of urea-formaldehyde slow-release fertilizer, and relates to a process for co-producing alginic acid liquid fertilizer in the production process of urea-formaldehyde slow-release fertilizer. Background technique [0002] The core process of the production of urea-formaldehyde slow-release fertilizer is that urea and formaldehyde are produced through a two-step reaction of hydroxylation addition reaction and methyleneation condensation reaction under certain conditions. The first step: hydroxylation reaction, formaldehyde and urea aqueous solution are heated under alkaline conditions, and an addition reaction is performed to generate monomethylolurea and dimethylolurea. The second step: when the methylol urea solution is acidified, the methylol urea and urea will continue to condense and undergo an exothermic methyleneization reaction to form partially or mostly water-insoluble methylurea with different degr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
CPCC05C9/02C05F11/00
Inventor 王学江孙继成李峰
Owner WUZHOUFENG AGRI SCI & TECH
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