Process for concentrating and removing impurities of diluted sulfuric acid

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: 2005-05-25
SICHUAN LOMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] With natural gas combustion tail gas as the heat source, 133Kg of dilute sulfuric acid is fed per hour in 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%), 560 ℃ of tower inlet temperatures, 103 ℃ of outlet temperatures, 63Kg of per hour evaporated water, obtain 70Kg concentrated sulfuric acid slurry 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%); thereafter, the concentrated sulfuric acid slurry is cooled to 65° C. of temperature, and vacuum filtration separation is carried out to obtain wet filter cake 33.83Kg per hour, and filtrate 36Kg (H 2 SO 4 59.21%, Fe 2 o 3 0.30%, MgO 0.71%, Al 2 o 3 0.43%, TiO 2 0.06%).

Embodiment 2

[0039] Carry out spray concentration, separation by embodiment one, after suction filtration, per hour 33.83Kg wet filter cake carries out gradation washing with 22.26% dilute sulfuric acid 30Kg, obtains 27.06Kg wet filter cake (H 2 SO 4 6.50%, H 2 O 18.5%), and contain the filtrate 36.77Kg of sulfuric acid 35.40%, this washing liquid returns the spray concentrating tower and merges with dilute sulfuric acid and is used as concentrated feed.

Embodiment 3

[0041] With coal-fired high-temperature gas, the specification is φ6×22m, and the volume is 600m 3 Feed dilute sulfuric acid 16.41t per hour in the spray concentration tower (its composition is: H 2 SO 423.16%; FeSO 4 ·7H 2 O 17.6%; MnSO 4 1.1%; MgSO 4 1.3%; CaSO 4 ·H 2 O 1.2%; TiO 2 0.5%) carry out spraying counter-current contact heating and concentration; hot air enters tower temperature 600 ℃, exits tower temperature 95 ℃, evaporates 9.0t of water per hour, obtains concentrated dilute sulfuric acid 7.4t (its composition is: H 2 SO 4 51.3%; FeSO 4 ·H 2 O 23.8%; MnSO 4 2.44%; MgSO 4 2.88%; CaSO 4 2.35%;TiO 2 1.11%).

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Abstract

The invention discloses a method for concentrating and removing impurities of dilute sulfuric acid, which is characterized in that hot air is directly contacted with dilute sulfuric acid that has been sprayed and atomized in a drying and concentrating tower, heating, evaporating and concentrating, cooling, separating the concentrated sulfuric acid for precipitation and The impurities in the precipitated acid solve the problem of fouling and blockage of the heat exchanger caused by the impurities in the dilute acid in the existing evaporation and concentration equipment, and the spray concentration tower used solves the problem of heat resistance and acid resistance of the dilute acid. The invention greatly saves device investment, simplifies the production process and reduces the production operation cost.

Description

Technical field: [0001] The invention relates to a method for concentrating dilute sulfuric acid and removing impurities. Background technique: [0002] Component Content (%) Component Content (%) Specific gravity 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] and dispose of after precipitation. The concentrated dilute sulfuric acid of the present invention belongs to the former, and its typical components are as follows: [0004] Because, in addition to sulfuric acid, this acid also contains a large amount 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...

Claims

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Application Information

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Patent Type & Authority Patents(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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