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Method for removing hydrogen sulfide of food-grade phosphoric acid

A hydrogen sulfide, food-grade technology, applied in the field of phosphorus chemical technology and environmental protection, to achieve the effect of improving degassing efficiency, production continuity and shortening cycle time

Inactive Publication Date: 2013-04-03
GUANGXI MINGLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After checking the rest of the literature, there is no method for removing hydrogen sulfide by using tower type in the degassing purification of food-grade phosphoric acid

Method used

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  • Method for removing hydrogen sulfide of food-grade phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First pump the top of the hydrogen sulfide removal tower to form a negative pressure, then inject the phosphoric acid after dearsenization into the acid collection tank from the acid inlet to the liquid level of 1 / 2 of the volume of the acid collection tank, heat and maintain the temperature at 80°C , turn on the circulating pump to transport the dearsenized phosphoric acid to the top of the hydrogen sulfide removal tower, spray evenly through the spray head, flow through the packing layer, and fully contact with the clean air rising from the bottom of the tower, the hydrogen sulfide in the phosphoric acid It is blown off from the top of the tower and enters the arsenic removal reactor. Phosphoric acid for hydrogen sulfide removal enters the acid collection tank from the bottom of the tower, and is transported to the top of the tower by a circulating pump to continue removing hydrogen sulfide or to the finished product tank to obtain food-grade phosphoric acid, depending...

Embodiment 2

[0030] First pump the top of the hydrogen sulfide removal tower to form a negative pressure, then inject the phosphoric acid after dearsenization into the acid collection tank from the acid inlet to the liquid level of 2 / 3 of the volume of the acid collection tank, heat and maintain the temperature at 90°C , turn on the circulating pump to transport the dearsenized phosphoric acid to the top of the hydrogen sulfide removal tower, spray evenly through the spray head, flow through the packing layer, and fully contact with the clean air rising from the bottom of the tower, the hydrogen sulfide in the phosphoric acid It is blown off from the top of the tower and enters the arsenic removal reactor. Phosphoric acid for hydrogen sulfide removal enters the acid collection tank from the bottom of the tower, and is transported to the top of the tower by a circulating pump to continue removing hydrogen sulfide or to the finished product tank to obtain food-grade phosphoric acid, depending...

Embodiment 3

[0032] First pump the top of the hydrogen sulfide removal tower to form a negative pressure, then inject the phosphoric acid after dearsenization into the acid collection tank from the acid inlet to the liquid level of 3 / 5 of the volume of the acid collection tank, heat and maintain the temperature at 70°C , turn on the circulating pump to transport the dearsenized phosphoric acid to the top of the hydrogen sulfide removal tower, spray evenly through the spray head, flow through the packing layer, and fully contact with the clean air rising from the bottom of the tower, the hydrogen sulfide in the phosphoric acid It is blown off from the top of the tower and enters the arsenic removal reactor. Phosphoric acid for hydrogen sulfide removal enters the acid collection tank from the bottom of the tower, and is transported to the top of the tower by a circulating pump to continue removing hydrogen sulfide or to the finished product tank to obtain food-grade phosphoric acid, depending...

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PUM

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Abstract

The invention discloses a method for removing hydrogen sulfide of food-grade phosphoric acid. The method comprises the following steps of: vacuumizing at a tower top of a hydrogen sulfide removing tower, enabling clean gas to move from a tower bottom to the tower top, conveying industrial arsenic-removed phosphoric acid to the tower top via a circulating pump, evenly distributing the phosphoric acid via a filler layer of the hydrogen sulfide removing tower and subsequently heating hydrogen sulfide in the phosphoric acid to fully contact with rising gas flow, blowing off the hydrogen sulfide to enable the hydrogen sulfide to enter an arsenic-removing reactor from the tower top, enabling the sulfuretted hydrogen-removed phosphoric acid to fall to the tower bottom, and conveying the sulfuretted hydrogen-removed phosphoric acid to the tower top via the circulating pump for continuously removing hydrogen sulfide or conveying the sulfuretted hydrogen-removed phosphoric acid to a finished product tank to obtain the food-grade phosphoric acid according to the detection situation of the removing effect of the hydrogen sulfide. Through the method, the hydrogen sulfide in the phosphoric acid can be accelerated to fully contact with the rising gas flow, the hydrogen sulfide gas in the phosphoric acid is efficiently removed, the problems of time consumption and energy consumption while repeatedly degassing the sulfuretted hydrogen-removed phosphoric acid via the traditional hydrogen sulfide removing device are solved, the circulation time of the process of removing the hydrogen sulfide is shortened and the degassing efficiency and the production continuity of the food-grade phosphoric acid are enhanced.

Description

Technical field: [0001] The invention belongs to the field of phosphorus chemical technology and environmental protection technology, and relates to a method for removing hydrogen sulfide with food-grade phosphoric acid. Background technique: [0002] Phosphorus is an important element of life. Food additive phosphoric acid is widely used in the food industry as a sour agent and a nutrient for yeast. The impurity index requirements in food-grade phosphoric acid are particularly strict. At present, the production of food-grade phosphoric acid mainly adopts industrial phosphoric acid as raw material to remove arsenic and purify. 2 S 5 Carry out arsenic removal reaction, filter and remove the arsenic slag precipitate to obtain arsenic phosphoric acid. The principle of arsenic removal is as follows: [0003] 2P 2 S 5 + 16H 2 O → 4H 3 PO 4 + 10H 2 S↑ [0004] h 3 AsO 4 + H 2 S → H 3 AsO 3 + H 2 O + S↓ [0005] h 3 AsO 3 + 3H 2 S → 6H 2 O + As 2 S 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234
Inventor 林军吴小海马钊松徐绍学黄新兴王文营彭艳霞罗培荣苏杰文
Owner GUANGXI MINGLI CHEM
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