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Process for preparing concentrated sulfuric acid from industrial sulfur-containing tail gas

A concentrated sulfuric acid and tail gas technology, which is applied in the chemical industry, sulfur compounds, climate sustainability, etc., can solve the problems of large equipment investment and high operating cost, and achieve the effect of low equipment investment, relatively low operating cost, and low operating cost

Active Publication Date: 2016-12-07
SHANGHAI DONGHUA ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has the disadvantages of large equipment investment and high operating costs.

Method used

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  • Process for preparing concentrated sulfuric acid from industrial sulfur-containing tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, the sulfur-containing waste gas data discharged by a certain device is used. It is determined that the gas volume of the tail gas is 2000 kmol / h, the temperature is 380 ° C, the pressure is 260 kPaG, and the molar composition is: N 2 84.9%, CO 2 10.6%, O 2 2.5%, SO 2 1.0%, H 2 O 1.0%.

[0024] like figure 1 As shown, the sulfur-containing tail gas and air enter the conversion reactor 1, the outlet temperature is controlled at 410°C, the operating pressure is controlled at 255kPaG, the catalyst is a vanadium-based catalyst, SO 2 The conversion rate was 99.7%. Afterwards, heat is recovered by the waste heat recovery system 2 and cooled to 280°C (about 30°C higher than the dew point of sulfuric acid), and enters the acid tower 3, and 40°C cooling water is added to the top of the tower, and the gas phase is partially condensed into acid. The operation of the acid tower 3 The temperature is controlled at 70-240°C, the operating pressure is controlled a...

Embodiment 2

[0027] In this example, the sulfur-containing waste gas data discharged by a certain device is used. It is determined that the gas volume of the tail gas is 2000 kmol / h, the temperature is 420 ° C, the pressure is 110 kPaG, and the molar composition is: N 2 82.2%, CO 2 10.3%, O 2 2.5%, SO 2 1.0%, H 2 O 4.0%.

[0028] like figure 1 As shown, the sulfur-containing tail gas and air enter the conversion reactor 1, the outlet temperature is controlled at 450°C, the operating pressure is controlled at 105kPaG, the catalyst is an iron-based catalyst, SO 2 The conversion rate was 99.5%. Afterwards, the heat is recovered by the waste heat recovery system 2 and cooled to 280°C (about 22°C higher than the dew point of sulfuric acid), and then enters the acid tower 3, adding cooling water at 40°C to the top of the tower, and stripping with dry air at 100°C at the bottom of the tower. Partially condensed into acid, the operating temperature of the acid tower 3 is controlled at 70-...

Embodiment 3

[0031] In this example, the sulfur-containing waste gas data discharged by a certain device is used. It is determined that the gas volume of the tail gas is 2000 kmol / h, the temperature is 400 ° C, the pressure is 10 kPaG, and the molar composition is: N 2 76.9%, CO2 9.6%, O 2 2.5%, SO 2 1.0%, H 2 O 10.0%.

[0032] like figure 1 As shown, the sulfur-containing tail gas and air enter the conversion reactor 1, the outlet temperature is controlled at 430°C, the operating pressure is controlled at 8kPaG, and the catalyst is a noble metal catalyst, SO 2 The conversion rate was 99.6%. After that, the heat is recovered by the waste heat recovery system 2 and cooled to 280°C (about 25°C higher than the dew point of sulfuric acid), and then enters the acid tower 3, adding cooling water at 40°C to the top of the tower, and stripping with dry air at 100°C at the bottom of the tower. Partially condensed into acid, the operating temperature of the acid tower 3 is controlled at 60-...

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Abstract

The invention discloses a process for preparing concentrated sulfuric acid from industrial sulfur-containing tail gas. The process comprises the following steps: introducing the sulfur-containing tail gas and air into a converter; carrying out a catalytic oxidation reaction under the action of a catalyst in order to convert sulfur-containing compounds such as H2S, Sx, COS and SO2 in the tail gas into SO3, CO2 and H2O; recovering heat through a residual heat recovering system, and introducing the SO3, the CO2 and the H2O into an acid tower; performing heat transfer by cooling water countercurrent contact, wherein concentrated sulfuric acid being 98 percent or above in percentage by mass can be prepared after condensation of sulfuric acid in a gas phase; the concentration of the sulfuric acid can be further increased by steam stripping of a stream of dry hot air in the acid tower; the temperature of the inlet of the converter is 350 to 500 DEG C; the temperature of the outlet is 400 to 600 DEG C; the operation pressure of the converter is -20 to 300kPaG; the operating temperature of the acid tower is 60 to 250 DEG C; the operating pressure of the acid tower is -20 to 300kPaG. The process can be widely applied to treatment of sulfur-containing tail gas produced in coal chemical industrial enterprises, petroleum enterprise and the like, and the sulfur-containing compounds in the tail gas are converted into the concentrated sulfuric acid.

Description

technical field [0001] The invention relates to a process for preparing concentrated sulfuric acid from industrial sulfur-containing tail gas, specifically, the invention relates to SO-containing 3 The process gas is in H 2 The process of condensation into sulfuric acid in the presence of O. Background technique [0002] During the use of sulfur-containing raw materials such as coal, oil, and natural gas, sulfur-containing gases will be produced. If they are discharged without treatment, they will cause serious pollution to the environment and cause harm to humans. In the past, for the convenience of storage and transportation, H 2 S tail gas is processed into sulfur, such as claus process. In 1934, the German Lurgi company developed a direct compound containing H 2 The process of producing sulfuric acid from S gas, and the process of directly producing acid from sulfur-containing waste gas have also been widely used. With the increasingly stringent environmental protec...

Claims

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Application Information

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IPC IPC(8): C01B17/775B01D53/86B01D53/48B01D53/50B01D53/52B01D53/73F22B1/18
CPCY02P20/10Y02P20/129Y02P20/151Y02P20/50
Inventor 赵小平崔娜熊孟王颖罗志林曾坤
Owner SHANGHAI DONGHUA ENVIRONMENT ENG
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