Method for synthesizing ammonium sulfate by using recovered ammonia water from chemical fertilizer plant

An ammonium sulfate and chemical fertilizer plant technology, applied in the field of comprehensive recycling of waste liquid, can solve the problems of high energy consumption by evaporation and concentration, waste of ammonia resources, environmental pollution, etc., and achieve the effects of low cost, high ammonia recovery rate and less equipment

Inactive Publication Date: 2013-06-19
赵建鹏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for producing ammonium sulfate by reclaiming ammonia water, so as to solve the problems in the prior art that the process is complicated, special materials and equipment are needed, there are many equipments, large investment, high energy consumption for evaporation and concentration, and about 10% of available ammonia. Recycled nitrogen water cannot be used, leading to environmental pollution, waste of ammonia resources, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the recovery ammoniacal liquor of concentration 8% prepares ammonium sulfate

[0012] Firstly, the recovered ammonia water containing 8% of effective ammonia is injected into the still, and NaoH and Ca(OH) are added 2 , heating the still to 70°C, and controlling the PH value between 9-10, ammonia can be decomposed from the ammonia water, stop when the ammonia concentration drops to 2%, and put the waste ammonia in the still into acid-resistant cement to settle In the pool, sediment discharge; Inject new recovered ammonia water, add NaoH and Ca(OH) 2 , the ammonia steamed from the still is directly passed into the reaction tank, and is neutralized with the diluted sulfuric acid. The concentration of sulfuric acid in the pool is controlled at 25%, and the pH value is controlled between 4-5. Ammonia is introduced at any time, and sulfuric acid is added at any time. Until the reaction reaches a saturated state, a large amount of ammonium sulfate crystals are ...

Embodiment 2

[0013] Embodiment 2: the recovery ammoniacal liquor of concentration 12% prepares ammonium sulfate

[0014] First, the recovered ammonia containing 12% of effective ammonia is injected into the still, and NaoH and Ca(OH) are added 2 , heating the still to 78°C, and controlling the PH value between 8-10, ammonia can be decomposed from the ammonia water, stop when the ammonia concentration drops to 3%, and put the waste ammonia in the still into acid-resistant cement to settle In the pool, sediment discharge; Inject new recovered ammonia water, add NaoH and Ca(OH) 2 , the ammonia steamed from the still is directly passed into the reaction tank, and is neutralized with the diluted sulfuric acid. The concentration of sulfuric acid in the pool is controlled at 30%, and the pH value is controlled between 5-6. Ammonia is introduced at any time, and sulfuric acid is added at any time. Until the reaction reaches a saturated state, a large amount of ammonium sulfate crystals are precip...

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PUM

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Abstract

The invention relates to a method for synthesizing ammonium sulfate by using recovered ammonia water from a chemical fertilizer plant. The method is characterized in that: a catalyst is added into recovered ammonia water; under a heating condition, ammonia in the ammonia water is evaporated, and directly participates in a neutralization reaction with sulfuric acid, such that ammonium sulfate crystals are produced; and spin-drying is carried out, such that an ammonium sulfate finished product is obtained. The method is subjected to simple process, less equipment, and low investment. No water intervention is in the neutralization reaction between ammonia and sulfuric acid, and no evaporation concentration is needed, such that consumption is reduced, and energy is saved. An ammonia recovery rate is higher than 95%. When sulfuric acid is supplemented in mother liquor, the mother liquor can be repeatedly used in continuous production. The method is a good method for comprehensive utilization of recovered ammonia water.

Description

technical field [0001] The invention relates to a method for synthesizing ammonium sulfate from ammonia water in a fertilizer factory, and belongs to the field of comprehensive recovery and utilization of waste liquid. Background technique [0002] At present, the method of comprehensive utilization of waste ammonia water is mainly ammonia desulfurization, that is, using ammonia water as a desulfurization absorbent to make sulfur dioxide in the flue gas react with ammonia water, the desulfurization rate is greater than 95%, and the sulfur dioxide emitted from the flue gas does not exceed 200 mg / standard Cubic meters, and no waste residue, no new pollution sources, desulfurization and chemical fertilizer ammonium sulfate are generated in the oxidation reaction. In addition, there are new processes for producing ammonium bicarbonate by using waste ammonia water and methanol to wash tail gas, and using waste ammonia water and waste phosphoric acid to produce ammonium phosphate,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/242
Inventor 赵建鹏
Owner 赵建鹏
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