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Concentrating and purifying technology of diluted sulfuric acid

A technology of dilute sulfuric acid and sulfuric acid, which is applied in the concentration and purification process of dilute sulfuric acid, and can solve the problems of low concentrated concentration of dilute sulfuric acid and low production capacity of a single set of sulfuric acid purification equipment

Inactive Publication Date: 2015-12-23
王卓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a process for concentrating and purifying dilute sulfuric acid, which solves the technical problems of low concentrated concentration of dilute sulfuric acid and low production capacity of a single set of sulfuric acid purification equipment in the prior art

Method used

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  • Concentrating and purifying technology of diluted sulfuric acid
  • Concentrating and purifying technology of diluted sulfuric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 As shown, it is a dilute sulfuric acid concentration and purification system according to the embodiment of the present invention, including: sulfuric acid evaporator 110, sulfuric acid recovery tower 120, enamel heat exchanger 130, sulfuric acid pump 140, water recovery tower 150, enamel heat exchanger 160, water circulation pump 170, alkali washing tower 180, alkali circulation pump 190.

[0017] Combine below figure 1 , a detailed description of a dilute sulfuric acid concentration and purification process, such as figure 2 shown, including:

[0018] Step 201, obtaining sulfuric acid vapor, sending the mixed vapor containing sulfuric acid vapor into the sulfuric acid recovery tower from the gas phase inlet on the lower side of the sulfuric acid recovery tower to complete mass transfer and heat transfer in the tower;

[0019] Wherein, the mixed vapor includes sulfuric acid vapor, sulfur trioxide, water vapor and other gases;

[0020] There are th...

Embodiment 2

[0040] For the indirect heating method, the sulfuric acid with a concentration of 70% is continuously added to the quartz glass sulfuric acid evaporator, and the sulfuric acid solution is heated by electric heating to make the sulfuric acid solution gasify into sulfuric acid vapor, which enters the sulfuric acid recovery tower through the insulation pipe to concentrate the sulfuric acid.

[0041] Because the volume of the quartz sulfuric acid evaporator cannot be made large, the sulfuric acid evaporator is generally a group of 5 or more sets of evaporators connected in parallel to form a group of sulfuric acid evaporation devices. The sulfuric acid vapor pipes of each set of sulfuric acid evaporators are insulated and then aggregated into a sulfuric acid vapor main pipe, which enters the sulfuric acid recovery tower from the gas phase inlet on the lower side of the sulfuric acid recovery tower. The sulfuric acid recovery tower is a packed tower, and the packing is a quartz ring...

Embodiment 3

[0047] For direct heating, add sulfuric acid with a concentration of 70% continuously into the steel-lined quartz glass sulfuric acid evaporator, use a heating method similar to immersion combustion to burn liquid or gaseous fuel through the burner outside the evaporator, and add excess The air is sufficient to ensure full combustion of the fuel, and the temperature of the flue gas is adjusted by adding excess air. The high-temperature flue gas is evenly dispersed into the evaporator from the bottom of the evaporator, and exchanges heat with the sulfuric acid solution in the evaporator to achieve the purpose of evaporating sulfuric acid. The sulfuric acid vapor, water vapor, sulfur trioxide, air, etc. and the mixture after passing through the demisting device at the top of the evaporator enter the sulfuric acid recovery tower from the gas phase inlet at the lower part of the sulfuric acid recovery tower to recover concentrated sulfuric acid.

[0048] Use DCS or PLC or a combin...

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Abstract

The invention relates to the field of chemical production, and discloses a concentration and purifying technology of diluted sulfuric acid. The technology comprises the following steps: obtaining sulfuric acid steam, introducing mixed steam containing sulfuric acid steam into a sulfuric acid recovering tower from the gas phase inlet arranged in the lower part of the sulfuric acid recovering tower so as to complete mass transfer and heat transfer in the sulfuric acid recovering tower; discharging water steam and a small amount of sulfuric acid fog from the gas phase outlet arranged in the top part of the sulfuric acid recovering tower, introducing water steam into a water recovering tower; discharging finished product of sulfuric acid from the liquid phase outlet arranged in the bottom part of the sulfuric acid recovering tower, delivering the finished product of sulfuric acid into an enamel heat exchanger to cool the sulfuric acid; introducing the cooled finished product of sulfuric acid to a sulfuric acid pump, pumping part of the sulfuric acid into a sulfuric acid storage tank, and pumping part of sulfuric acid into the sulfuric acid recovering tower from the liquid phase inlet arranged in the upper part of the sulfuric acid recovering tower so as to use the sulfuric acid to carry out heat transfer and mass transfer with mixed steam, which enters the sulfuric acid recovering tower from the gas phase inlet in the lower part of the sulfuric acid recovering tower so as to complete the concentration and purification of sulfuric acid. The problems of low concentration of concentrated sulfuric acid, high operation cost, and environment pollution are solved.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a process for concentrating and purifying dilute sulfuric acid. Background technique [0002] At present, the concentration of dilute sulfuric acid in China mostly adopts the process of heating and evaporating with graphite evaporator. The technology is mature and the operation is simple. However, due to the limitation of evaporation equipment and process, the concentration of dilute sulfuric acid can only be concentrated to 60%. At present, most domestic industrial sulfuric acid purification processes use quartz glass electric heating evaporators. Limited by quartz glass evaporators, they can only be produced in clusters of several or dozens of evaporators. The output is low, and the concentration of sulfuric acid cannot be adjusted. Contents of the invention [0003] The invention provides a process for concentrating and purifying dilute sulfuric acid, which solves the tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01B17/88
Inventor 王卓
Owner 王卓