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Regeneration method of waste sulfuric acid, and sulfuric acid produced by the method

A high-temperature pyrolysis technology for waste sulfuric acid, which is applied in the field of sulfuric acid, can solve the problems of complex process flow, high cost, and high energy consumption in production, and achieve the effects of simplified process flow, simple operation, and significant economic benefits

Active Publication Date: 2014-08-13
KEYON PROCESS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of the waste sulfuric acid regeneration method in the prior art, such as complex process flow, high production energy consumption, and high cost, the present invention provides an improved waste sulfuric acid regeneration method to produce qualified industrial-grade sulfuric acid, simplifies the operation process, and realizes the regeneration device Economic benefits and rational use of energy

Method used

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  • Regeneration method of waste sulfuric acid, and sulfuric acid produced by the method
  • Regeneration method of waste sulfuric acid, and sulfuric acid produced by the method
  • Regeneration method of waste sulfuric acid, and sulfuric acid produced by the method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The composition of waste sulfuric acid is shown in the table below, and 29% mol oxygen-enriched air is used to support combustion in the cracking furnace.

[0051] Table 1

[0052]

[0053] The process flow of this scheme can be found in figure 1 . The feed waste acid undergoes a cracking reaction in the cracking furnace S1, see equations (1), (2) and (5) for details, the reaction temperature of the cracking furnace is 1020°C, and it is realized by burning heavy oil or fuel gas, wherein the combustion-supporting air is preferably The above-mentioned 29% mol oxygen-enriched air, the residual oxygen in the furnace gas is 3 mol%, and 99.5% of the waste sulfuric acid is reduced to SO 2 , the remainder is SO 3 , while producing a large amount of H 2 O, the residence time of pyrolysis reaction is 1.5s.

[0054] The discharged gas is cooled to 420-425°C by the heat exchanger S2, and the recovered heat is used to produce medium and high-pressure saturated steam, supplem...

Embodiment 2

[0061] The composition of waste sulfuric acid is shown in the table below, and 45mol% oxygen-enriched air is used to support combustion in the cracking furnace.

[0062] Table 2

[0063]

[0064] The process flow of this scheme can be found in figure 1 . The feed waste acid undergoes a cracking reaction in the cracking furnace S1, see equations (1), (2) and (5) for details, the reaction temperature of the cracking furnace is 1150°C, and it is realized by burning heavy oil or fuel gas, wherein the combustion air is preferably The above-mentioned 45% mol oxygen-enriched air, the residual oxygen in the furnace gas is 5 mol%, and 99.73% of the waste sulfuric acid is reduced to SO 2 , the remainder is SO 3 , while producing a large amount of H 2 O. The residence time of pyrolysis reaction is 1.3s.

[0065] The discharged gas is cooled to 430-435°C by the heat exchanger S2, and the recovered heat is used to produce medium and high-pressure saturated steam, supplemented with...

Embodiment 3

[0072] The composition of waste sulfuric acid is shown in the table below, and air (with an oxygen content of 20.7% mol) is used to support combustion in the cracking furnace.

[0073] table 3

[0074]

[0075] The process flow of this scheme can be found in figure 1 . The feed waste acid undergoes a cracking reaction in the cracking furnace S1, see equations (1), (2) and (5) for details, the reaction temperature of the cracking furnace is 950°C, and it is realized by burning heavy oil or fuel gas, wherein the combustion air is preferably The above-mentioned air, the residual oxygen in the furnace gas is 4.3mol%, and 99.35% of the waste sulfuric acid is reduced to SO 2 , the remainder is SO 3 , while producing a large amount of H 2 O. The residence time of pyrolysis reaction is 1.7s.

[0076] The discharged gas is cooled to 430-435°C by the heat exchanger S2, and the recovered heat is used to produce medium and high-pressure saturated steam, supplemented with oxygen-e...

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Abstract

The invention provides a regeneration method of waste sulfuric acid and sulfuric acid produced by the method. The regeneration method includes following steps: carrying out a high-temperature cracking operation in a cracking furnace to waste sulfuric acid subjected to pressurized atomization for obtaining a product wherein the high-temperature cracking temperature is 800-1200 DEG C a high-temperature pyrolysis temperature is 800-1200 DEG C, oxygen content of gas discharged from the furnace is not less than 2mol% and reaction residence time is 1.2s-2.5s; cooling the product to 410-435 DEG C and directly carrying out a multistage catalytic oxidation reaction without a drying operation until the conversion rate of sulfur dioxide being 99%-99.8% with an interstage cooling process, wherein a reaction starting temperature T of each stage of the multistage catalytic oxidation reaction is described as T=(390+(n-m)*10) DEG C with n being an overall reaction stage number and m being a present reaction stage number; further carrying out a cooling process with a cooling temperature being 260-320 DEG C; and then carrying out the cooling process with a final cooling temperature being 60-120 DEG C. Difference between air inlet temperature and process gas outlet temperature is 50-85 DEG C. The method is simplified in process and is reasonable in equipment arrangement.

Description

technical field [0001] The invention relates to a regeneration method of waste sulfuric acid and the obtained sulfuric acid. Background technique [0002] Concentrated sulfuric acid is widely used as a catalyst in petrochemical and organic synthesis industries, and this process will produce a large amount of waste sulfuric acid. For example: In the oil refining industry, isoparaffins and olefins are alkylated under the catalysis of 98wt% to 99.5wt% concentrated sulfuric acid to produce high-octane gasoline blending component oil. Under the condition of excess olefin, the reactants are continuously fed, and at the same time, the mixture flowing out from the reactor can be separated to obtain an acid phase rich in catalyst concentrated sulfuric acid and an oil phase rich in alkylation products. Most of the acid phase products can be recycled, but as the reaction progresses, water and some acid-soluble hydrocarbon polymers will gradually enter the concentrated sulfuric acid, r...

Claims

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Application Information

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IPC IPC(8): C01B17/90
Inventor 杨晓倩
Owner KEYON PROCESS