Method for producing sulfuric acid by using waste gas containing hydrogen sulfide

A technology for producing hydrogen sulfide and sulfuric acid, applied in the chemical industry, can solve the problems of narrow application range, long process flow and high operating cost, and achieve the effects of wide application range, high heat recovery efficiency and low operating cost.

Inactive Publication Date: 2010-01-06
SINOPEC NANJING ENG & CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently my country H 2 There are dry method and dry-wet combination method for S sulfuric acid production, but these two methods have a lo

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  • Method for producing sulfuric acid by using waste gas containing hydrogen sulfide

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Embodiment 1

[0019] Embodiment 1: the method for producing sulfuric acid from hydrogen sulfide waste gas of the present invention is illustrated by taking the synthetic ammonia of a certain plant as an example.

[0020] Exhaust gas conditions: temperature 33°C, pressure 2.2bar, gas composition as follows:

[0021] h 2 1.2385kmol / h

[0022] N 2 7.5866 kmol / h

[0023] CO 0.1586kmol / h

[0024] NH 3 0.1280kmol / h

[0025] HCN 0.0366kmol / h

[0026] CO 2 70.0807kmol / h

[0027] h 2 S 30.8949kmol / h

[0028] COS0.5392kmol / h

[0029] CH 3 OH 0.1541kmol / h

[0030] h 2 O 2.3429kmol / h

[0031] The exhaust gas from the above-mentioned ammonia synthesis unit and the preheated air at a temperature of 200-250°C enter the combustion furnace for combustion, and the sulfur-containing components such as hydrogen sulfide in the gas are completely burned to produce water and SO 2 , CO, NH in gas 3 , HCN and other components burn to produce CO 2 ,...

Embodiment 2

[0033] Embodiment 2: Take the sulfur-containing waste gas of a viscose factory as an example to illustrate the method for producing sulfuric acid from hydrogen sulfide waste gas according to the present invention. There are two streams of waste gas from the viscose factory, one is lean air with low sulfur content, which is mainly from the suction air of spinning and refining equipment, and contains H released from materials in the equipment. 2 S, CS 2 , COS; the other is rich gas with higher sulfur content, which comes from the evaporation of concentrated sulfuric acid for spinning, steam stripping of short filaments in wool laying tank, and degassing of viscose collagen solution. The indicators of these two materials are as follows:

[0034] 1. Poor gas condition

[0035] Flow: 78300Nm 3 / h

[0036] CS 2 : 12.5-13.9 / Nm 3 (319Nm3 / h, equivalent to 0.41mol%);

[0037] h 2 S: 1.62-1.80g / Nm 3 (93Nm3 / h, equivalent to 0.12mol%);

[0038] o 2 : 15584Nm 3 / h, 19.98mol%;

...

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Abstract

The invention discloses a method for producing sulfuric acid by using waste gas containing hydrogen sulfide, and the method comprises the steps of firstly burning the waste gas containing H2S at the temperature of 600-1300 DEG C for generating high-temperature gas containing SO2; cooling the high-temperature gas containing SO2 to 400-500 DEG C, entering into a converter, oxidizing SO2 to SO3 under the action of a catalyst in the converter, generating SO3 gas and cooling to 250-350 DEG C, further entering a condenser for condensing SO3 and water vapor to H2SO4 and emitting exhaust gas. The method can not only solve the waste gas treatment problem of chemical fertilizers, petrochemical industry, natural gas, coal chemical industry, coking, chemical fibers and other industries, but also change wastes into treasures and utilize the waste gas containing the hydrogen sulfide to produce the sulfuric acid and the steam of 2.5-6MPa under the situation of not consuming other chemical products; and the method has no emissions of waste acid and waste water, and the emitted exhaust gas achieves the national emission standard, thereby being the real green energy method of changing the wastes into the treasures.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing sulfuric acid from waste gas containing hydrogen sulfide. Background technique [0002] In chemical fertilizer, petrochemical, natural gas, coal chemical, coking and chemical fiber industries, sulfur in raw materials is basically H 2 The form of S comes out of the system. h 2 S is a poisonous and harmful gas, which is not easy to store and cannot be discharged directly. Usually, H 2 S is made into elemental sulfur or sulfuric acid. Elemental sulfur is also usually used to make sulfuric acid. So use H 2 It is more reasonable to make S directly into sulfuric acid. Currently my country H 2 There are dry method and dry-wet combination method for S sulfuric acid production, but these two methods have a long process flow, high requirements on the components of waste gas, narrow application range, high operating costs, and waste acid generation....

Claims

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Application Information

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IPC IPC(8): C01B17/74F22B1/00
CPCY02P20/129
Inventor 孙正东陈德兴龚建华邹玉霜俞向东
Owner SINOPEC NANJING ENG & CONSTR
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