Process for concentration of sulphuric acid

A technology of sulfuric acid and concentration tower, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problem of corrosion and difficulty in obtaining it, and achieve the effect of reducing energy consumption and investment

Inactive Publication Date: 2004-03-03
HALDOR TOPSOE AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has serious corrosion problems and it is difficult to obtain 98% H 2 SO 4

Method used

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  • Process for concentration of sulphuric acid
  • Process for concentration of sulphuric acid
  • Process for concentration of sulphuric acid

Examples

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Embodiment Construction

[0021] figure 1 An embodiment of the invention is shown in which the hot air produced by the air heater 4 of the wet gas sulfuric acid plant with components 1 to 18 is used to concentrate the sulfuric acid of the sulfuric acid plant with components 20 to 27 . In a wet gas sulfuric acid plant, spent acid or a mixture of spent acid and spent acid containing other sulfur is fed through line 1 into calciner 3, where it is supplied with carrier fuel and hot combustion gas through line 2, usually at 1000 Burn the spent acid stream at °C to obtain 10-25% H 2 O and 2-6% SO 2 of flue gas. will catalyze SO 2 SO in reactor 6 2 convert to SO 3 The required excess air is added to the flue gas stream. The combustion air used in the calciner 3 to concentrate the acid from the acid condenser 15 in the concentration column 21 is heated in the heat exchanger 4 to typically 500-550° C. The flue gas is cooled to about 400° C. by heat exchanger 4 and in boiler 5 .

[0022] Typically, the ...

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Abstract

The present invention provides a process for concentrating sulphuric acids with concentrations of 90% to 98% H2SO4 and temperatures of 160 DEG C to 270 DEG C into sulphuric acid with concentrations of 96% to 98.8% H2SO4 by contacting the acid countercurrently in a packed tower with hot air or with hot process gas containing up to 6% SO3 and up to 30% H2O and with inlet temperatures to the tower of 350 DEG C to 600 DEG C. The H2O and H2SO4 evaporated in the tower is contained in a stream of offgas from which the H2SO4 thereafter is removed by controlled condensation. The invention relates, in particular, to concentrating the product acid from wet gas sulphuric acid plants in which condensation of H2SO4 takes place in the presence of excess H2O in the process gas in air cooled, vertical glass tubes.

Description

technical field [0001] The present invention relates to a process for the production of concentrated sulfuric acid by concentrating sulfuric acid of relatively low concentration. Background technique [0002] A number of methods for concentrating sulfuric acid are known which make H 2 SO 4 The concentration reaches 96%-98%. The A25 volume of the Ullman Encyclopedia of Industrial Chemistry published by Springer Press in 1995 has an overview of these methods on pages 687-690. These methods include: [0003] Boiling of sulfuric acid in vacuum is generally carried out in a recirculating evaporator in a flash vessel at a pressure of 15-50 mbar absolute. The vapor is fractionated in the distillation column whereby most of the H 2 SO 4 Separated from the water vapor and returned to the flasher. The vacuum concentration of sulfuric acid is based on known distillation principles to reach an acid strength of 98%, but the investment and operating costs are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/88
CPCC01B17/88
Inventor P·肖拜
Owner HALDOR TOPSOE AS
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