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Method for making sulfur trioxide, sulfuric acid, and oleum from sulfur dioxide

A technology of sulfuric acid and catalytic converters, applied in the fields of sulfur dioxide/sulfurous acid, chemical instruments and methods, inorganic chemistry, etc., which can solve the problems of limited capacity of SO2 emission equipment, low conversion rate, increased system investment and operating costs, etc.

Inactive Publication Date: 2002-12-11
MONSANTO CO (MONSANTO CY)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has disadvantages, since the intermediate absorption zone significantly increases the capital and operating costs of the system
Also, even with double absorption, to ensure high conversion and low SO 2 Emission equipment capacity is still limited

Method used

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  • Method for making sulfur trioxide, sulfuric acid, and oleum from sulfur dioxide
  • Method for making sulfur trioxide, sulfuric acid, and oleum from sulfur dioxide
  • Method for making sulfur trioxide, sulfuric acid, and oleum from sulfur dioxide

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Embodiment

[0117] This example further illustrates and explains the invention. However, the invention should not be construed as limited to any details of this example.

[0118] The performance of the system shown in Figure 4 was evaluated using a computer model. In the sulfur burner 2006 by burning sulfur 2009 in the presence of dry air 2012 to form 2 , about 2mol%O 2 and about 79 mol% N 2 The feed gas 2003. The feed gas 2003 (at a temperature of about 1538°C when leaving the sulfur burner 2006) is cooled to about 548°C in the waste heat boiler 2002. In the indirect heat exchanger 2015 (ie Monplex TM , Monsanto Environ-Chem Systems, Inc., St.Louis, MO, USA) from feed gas 2004 to supply SO 2 Heat transfer to the gas 2024 of the oxidation catalytic converter 2021 further cools the feed gas 2004 to about 337°C. Finally, the feed gas 2024 is cooled to about 204° C. in another indirect heat exchanger 2023 that utilizes the heat of the feed gas 2024 to generate steam.

[0119] The coo...

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Abstract

A first portion of the converter feed gas comprising a SO 2 -enriched stripping gas is formed. Passing the converter feed through a plurality of catalyst beds in series to form a reformed gas comprising SO3 and residual SO2, the plurality comprising at least 2 and no more than 4 catalyst beds. The second portion of the SO2-enriched gas is introduced into at least one catalyst bed downstream of the most upstream catalyst bed of the plurality of catalyst beds to increase the SO2 concentration in the gas fed to the downstream bed. The invention also relates to a process for the production of sulfuric acid and / or oleum from a feed gas comprising SO2. The SO2-enriched stripping gas is passed through multiple series-connected catalyst beds to form a reformed gas comprising SO3 and residual SO2. mixing the reformed gas with water vapor to form a product acid gas comprising: (a) sulfuric acid from the gas phase reaction between SO3 from the oxidation product gas and water vapor, thereby generating gas phase heat of sulfuric acid formation; (b) SO3 ; and (c) SO2. Thermal energy is recovered from gas phase sulfuric acid generation heat by heat transfer from the product acid gas to steam or feed water in an indirect heat exchanger. The cooled product acid gas is then contacted with sulfuric acid liquid in the SO3 absorption zone to form additional sulfuric acid and / or oleum and SO3-depleted gas containing SO2.

Description

field of invention [0001] The present invention relates to a new process for the preparation of sulfur trioxide by oxidation of sulfur dioxide. The invention also relates to the preparation of liquid sulfuric acid (H 2 SO 4 ) and / or the method of oleum, wherein SO 2 Oxidation to SO 3 , and then contact with water or sulfuric acid solution to generate additional sulfuric acid and / or oleum. The invention also relates to the recovery of high-grade energy from the heat generated during this contact process. Background of the invention [0002] Sulfuric acid is the most produced chemical in the world. Most sulfuric acid is used to produce phosphoric acid in compound fertilizers. Sulfuric acid is also used, for example, in dyes and pigments, industrial explosives, etching applications, alkylation catalysis, electroplating baths, and non-ferrous metallurgy. It is reported that about 570,000 tons per day are currently produced in the world, about 30% of which are produced in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/60C01B17/765C01B17/775
CPCC01B17/60C01B17/765
Inventor A·V·梅诺
Owner MONSANTO CO (MONSANTO CY)
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