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Production of sulfuric acid from coke oven gas desulfurization product

A technology for coke oven gas and sulfuric acid, which is applied to the preparation/purification of sulfur, separation methods, sulfur compounds, etc., can solve the problems of increased corrosiveness of sulfuric acid products, and achieve the effects of simple process equipment, reduced impact, and cheap process equipment

Inactive Publication Date: 2015-11-25
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NO 2 The presence of nitrosylsulfuric acid (NOHSO 4 ) condensation may lead to increased corrosivity of the sulfuric acid product

Method used

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  • Production of sulfuric acid from coke oven gas desulfurization product
  • Production of sulfuric acid from coke oven gas desulfurization product
  • Production of sulfuric acid from coke oven gas desulfurization product

Examples

Experimental program
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Effect test

Embodiment 1

[0070] In an embodiment according to the present disclosure, using such as figure 2 The method shown, which involves ammonia absorbent solution and quinone type H 2 S oxidation catalyst. Key parameters used to treat typical coke oven gas (given in Table 1) in a wet sulfuric acid process are shown in Table 2. The overall process includes coke oven gas desulfurization, incineration of sulfur sludge and production of coke oven gas absorber liquid and sulfuric acid in a wet sulfuric acid plant.

[0071] The coke oven gas is cooled to about 30°C and contacted with a liquid ammonia absorbent solution which also contains dissolved quinone catalyst. The alkaline absorber according to this embodiment operates at approximately atmospheric pressure. In a reactor operating at about 30°C, about 50% of the H 2 S is converted to elemental sulfur, forming a liquid slurry. remaining H 2 S is further oxidized to a large number of ions containing sulfur and oxygen, which for simplicity ar...

Embodiment 2

[0086]Example 2 involves a process operated under similar conditions to Example 1, but with an alternative nitrogen removal system.

[0087] The process gas leaving the incinerator is similar to that in Example 1, except that it is now assumed that the content of N from the feed (SCN - and NH 4 + -salt) to form 1.5% NO X .

[0088] uncontrolled NO X The concentration will be 540ppm by volume, equivalent to 1,230mg / Nm 3 (in NO 2 calculate). Thanks to SO 2 The oxidation catalyst also oxidizes part of the colorless NO into red NO 2 , so the process gas leaving the chimney will have a distinct color.

[0089] if NO 2 Concentrations can be lower than about 280mgNO 2 / Nm 3 , the NO formed during incineration X Keep below about 1% N in the feed, then the chimney plume can be colorless without the need for a nitrogen removal process, but the NO X Concentrations may still be above local discharge limits.

[0090] The temperatures in the incinerator and in the combustion ...

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Abstract

The present invention relates to a process and a process plant for the production of sulfuric acid from a gas comprising H 2 S and HCN characterized by the following steps; directing said gas to an alkaline absorber containing a liquid ammonia absorbent solution and a material catalytically active in oxidation of H 2 S to elemental sulfur providing a liquid slurry comprising sulfur and coke oven gas absorber liquid, separating at least a portion of said elemental sulfur from coke oven gas absorber liquid by mechanical means of separation as a sulfur sludge, combining said sulfur sludge with a support fuel and a first gas comprising oxygen in or upstream an incinerator, incinerating said mixture, providing an incinerated gas comprising SO 2 and NO x , optionally adding a second gas comprising oxygen to said incinerated gas, selectively removing the formed NO x by chemical reduction with NH 3 , contacting said process gas with a material active in oxidation of SO 2 to SO 3 providing an oxidized process gas, optionally adding water to said oxidized process gas and condensing concentrated sulfuric acid formed in said oxidized process gas.

Description

technical field [0001] The present invention relates to a method and process equipment for the removal of hydrogen sulfide and hydrogen cyanide from coke oven gas and the associated production of concentrated sulfuric acid. Background technique [0002] When coke oven gas is produced from coal, large amounts of sulfur and nitrogen are also released, mainly H 2 Forms of S and HCN. These components must be removed from coke oven gas before it can be used as city gas or process gas. One method of cleaning coke oven gas involves absorbing H in alkaline scrubbers 2 S and HCN, and H by means of a liquid catalyst 2 S is oxidized to elemental sulfur and the liquid catalyst is usually a combination of quinone compounds and metals such as vanadium, cobalt or iron to promote catalytic activity. The elemental sulfur is then separated from the slurry and can be sold as low quality sulfur or it can be transferred to a sulfuric acid production facility where it is incinerated using a s...

Claims

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Application Information

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IPC IPC(8): C01B17/74
CPCC01B17/54B01D53/00C01B17/05C01B17/765B01D53/1468B01D2252/102B01D2252/602B01D2257/304B01D2257/408Y02P20/129
Inventor M·特莱夫森
Owner HALDOR TOPSOE AS
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