Process for concentrating diluted sulfuric acid and removing impurities

A production method and technology of dilute sulfuric acid, applied in the direction of sulfur trioxide/sulfuric acid, chemical instruments and methods, sulfur compounds, etc., can solve problems such as shortening the process flow, reducing processing operation costs, reducing investment in concentrated dilute sulfuric acid equipment, etc., to achieve simplification process, shorten the production process, and reduce the effect of device investment

Inactive Publication Date: 2002-10-30
SICHUAN LOMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This production method shortens the process flow, and because no heat exchanger is used, the problem of fouling and fouling of the heat exchanger is solved; due to the simplification of the process flow, there is only one separation of impurities precipitated and precipitated in the acid; and low-cost Corrosion-resistant and temperature-resistant materials reduce the investment in concentrated dilute sulfuric acid equipment, and also reduce the cost of processing operations

Method used

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  • Process for concentrating diluted sulfuric acid and removing impurities
  • Process for concentrating diluted sulfuric acid and removing impurities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using natural gas combustion tail gas as the heat source, 133Kg of dilute sulfuric acid per hour is fed into the simulated spray concentration tower (its main composition is: H 2 SO 4 22.26%, FeSO 4 ·7H 2 O 20.8%, MnSO 4 1.1%, MgSO 4 1.2%, CaSO 4 ·H 2 O 1.2%, TiO 2 0.45%), the inlet temperature of the tower is 560°C, the outlet temperature is 103°C, the amount of evaporated water per hour is 63Kg, and 70Kg of concentrated sulfuric acid slurry is obtained per hour from the bottom of the tower (its main composition is: H 2 SO 4 42.29%, FeSO 4 ·H 2 O24.11%, MnSO 4 2.09%, MgSO 4 2.28%, CaSO 4 2.01%, TiO 2 0.85%); Afterwards, the concentrated sulfuric acid slurry was cooled to a temperature of 65°C, and vacuum filtration was carried out to obtain a wet cake of 33.83Kg per hour, and a filtrate of 36Kg (H 2 SO 4 59.21%, Fe 2 O 3 0.30%, MgO0.71%, Al 2 O3 0.43%, TiO2 0.06%).

Embodiment 2

[0035] Perform spray concentration and separation according to Example 1. After suction filtration, 33.83Kg of wet cake is washed with 22.26% dilute sulfuric acid 30Kg per hour to obtain 27.06Kg of wet cake (H2SO4 6.50%, H2O 18.5%), and 36.77Kg of the filtrate washing liquid containing 35.40% sulfuric acid, the washing liquid is returned to the spray concentration tower and combined with dilute sulfuric acid as a concentrated feed.

Embodiment 3

[0037] With coal-burning high-temperature gas, the specification is φ6×22m, and the volume is 600m 3 16.41t of dilute sulfuric acid per hour (its composition: H2SO4 23.16%; FeSO4·7H2O 17.6%; MnSO4 1.1%; MgSO4 1.3%; CaSO4·H2O 1.2%; TiO2 0.5%) is fed per hour into the spray concentration tower for spray countercurrent contact Heating and concentration; hot air enters the tower at 600℃, exits at 95℃, and evaporates 9.0t per hour to obtain concentrated dilute sulfuric acid 7.4t (the composition is: H2SO451.3%; FeSO4·H2O 23.8%; MnSO4 2.44%; MgSO4 2.88%; CaSO42.35%; TiO2 1.11%).

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Abstract

A process for concentrating diluted sulfuric acid while removing impurities includes such steps as counter-current contact between hot air and atomized diluted sulfuric acid in drying-concentrating tower for heating, evaporating and concentrating, cooling, and separating the educed or deposited impurities for sulfuric acid. Its advantages are low cost and simple process.

Description

Technical Field: [0001] The invention relates to a method for concentrating and removing impurities of dilute sulfuric acid. Background technique: [0002] Composition Content (%) Composition Content (%) Proportion 1.32(g / cm 3 ) H 2 SO 4 22.26 Fe 2 O 3 5.03 Al 2 O 3 0.2 MgO 0.40 TiO 2 0.68 V 0.03 Cr 0.006 Nb 0.004 Pb 0.015 P 0.005 CaO 0.43 [0003] In addition to sulfuric acid, this acid also contains a lot of other impurities, such as Fe in the form of ferrous sulfate. 2 O 3 , TiO in the form of metatitanic acid 2 , And magnesium sulfate, aluminum sulfate, calcium sulfate, etc. It brings greater difficulties to the production and utilization of evaporative concentration, and at the same time, efflux also causes harm to environmental protection. The current processing methods a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88C01B17/90
Inventor 龚家竹池济亨郝虎李家权
Owner SICHUAN LOMON CORP
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