Acid preparing method by coal gas wet oxidation and desulfurization

A wet oxidative desulfurization and sulfur trioxide technology, which is applied to the preparation/purification/separation of sulfur trioxide/sulfuric acid and hydrogen cyanide, etc., can solve the problems of high corrosion of desulfurization waste liquid, unfavorable industrial production, and large environmental impact , to achieve strong applicability and promotion value, increase utilization value, and improve the effect of the environment

Active Publication Date: 2009-09-02
NINGBO KEXIN CHEM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The desulfurization waste liquid of the method is highly corrosive, highly toxic and has a g...

Method used

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  • Acid preparing method by coal gas wet oxidation and desulfurization
  • Acid preparing method by coal gas wet oxidation and desulfurization
  • Acid preparing method by coal gas wet oxidation and desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] use figure 1 process, figure 2 desulfurization regeneration tower, image 3 the nozzle and Figure 4 the converter. The basic process conditions are as follows:

[0064] Composition and content of sulfur-containing gas:

[0065] Hydrogen sulfide 8g / m 3 , hydrogen cyanide 2g / m 3 , hydrogen 35g / m 3 , carbon monoxide 5g / m 3 , methane 30g / m 3 , carbon dioxide 1g / m 3 .

[0066] The composition and concentration of desulfurization lean solution are as follows:

[0067] The ammoniacal liquor contains ammonia 18 grams per liter, the pH value is 9.5, the catalyst is hydroquinone and phthalocyanine cobalt sulfonate metal organic compound, and the weight content of the catalyst is 5 grams per liter;

[0068] The absorption temperature is 40°C and the absorption pressure is 15Kpa;

[0069] The ratio of sulfur-containing gas to desulfurized lean liquid is: 50 standard meters 3 Sulfur-containing gas / liter desulfurized lean liquid;

[0070] Such as figure 1 , the sulf...

Embodiment 2

[0089] use figure 1 process, figure 2 desulfurization regeneration tower, image 3 the nozzle and Figure 4 the converter. The basic process conditions are as follows:

[0090] Composition and content of sulfur-containing gas:

[0091] Hydrogen sulfide 1g / m 3 , hydrogen cyanide 1g / m 3 , hydrogen 60g / m 3 , carbon monoxide 60g / m 3 , methane 1g / m 3 , carbon dioxide 20g / m 3 .

[0092] The composition and concentration of desulfurization lean solution are as follows:

[0093] Sodium carbonate 0.5N, (normal concentration), pH value is 8.5, catalyst is 1,4-naphthoquinone-2-sodium sulfonate, and the weight content of catalyst is 3%;

[0094] The absorption temperature is 25°C and the absorption pressure is 10Kpa;

[0095] The ratio of sulfur-containing gas to desulfurized lean liquid is: 40 standard meters 3 Sulfur-containing gas / liter desulfurized lean liquid;

[0096] Such as figure 1 , the sulfur-containing gas is passed into the desulfurization regeneration tower ...

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Abstract

The invention provides an acid preparing method by coal gas wet oxidation and desulfurization, which comprises the following steps of: introducing sulfur-containing coal gas into an absorption section of a desulfurization regeneration tower from the bottom, and then introducing desulfurization barren solution into the absorption section from the upper part to contact the coal gas countercurrent; delivering desulfurization rich liquid from the bottom of the absorption section at the lower part of the desulfurization regeneration tower into a regeneration section at the top of the desulfurization regeneration tower; introducing regeneration air into the regeneration section to obtain the mixture of the desulfurization barren solution and sulfur foam; concentrating the sulfur foam into sulfur pulp to be delivered in a combustion furnace after being atomized by adopting compressed air through a nozzle and then delivered into a converter provided with vanadium catalyst to be converted to sulfur trioxide after the furnace gas is cooled, washed and dried; and delivering the sulfur trioxide into an absorption tower to be converted into product sulfuric acid with weight concentration of 94 percent to 98 percent. The method reduces exhaust emissions, does not emit liquid waste outwards, and has conversion rate of sulfur dioxide over 99.6 percent and good economic and social benefits.

Description

technical field [0001] The invention relates to a method for producing acid by gas desulfurization, in particular to a method for producing sulfuric acid by using gas wet oxidative desulfurization slurry as a raw material. Background technique [0002] The traditional gas wet oxidation desulfurization process uses ammonia water and dilute alkali (sodium carbonate) as the alkali source, absorbs hydrogen sulfide and hydrogen cyanide in the gas in the desulfurization tower, and then the regeneration tower oxidizes hydrogen sulfide into sulfur foam through air, and generates corresponding salts. [0003] At present, domestic sulfur foam uses steam to heat and melt sulfur, so that the sulfur content in it reaches 50-90%, and the desulfurization waste liquid is blended into coking coal. The catalyst for desulfurization is metal organic compound of hydroquinone and phthalocyanine cobalt sulfonate, or 1,4-naphthoquinone-2-sodium sulfonate, and an appropriate amount of potassium sod...

Claims

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Application Information

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IPC IPC(8): C01B17/69C01C3/02
Inventor 范文松刘忠安
Owner NINGBO KEXIN CHEM ENG TECH
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