Fluorine-containing sulfuric acid separation concentration device and separation concentration method

A technology for concentration device and sulfuric acid, applied in sulfur trioxide/sulfuric acid and other directions, can solve the problems of difficult realization, complicated operation steps, strong corrosiveness, etc., and achieve the effect of simple method, good separation and concentration effect.

Inactive Publication Date: 2012-04-25
FINE SILICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for dilute sulfuric acid containing hydrofluoric acid, the above-mentioned method is not only complicated in operation steps, but also difficult to realize.
In addition, both hydrofluoric acid and dilute sulfuric acid are inorganic strong acids, which are highly corrosive and have high requirements for separation devices and evaporation devices. Device and method for separation and concentration

Method used

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  • Fluorine-containing sulfuric acid separation concentration device and separation concentration method
  • Fluorine-containing sulfuric acid separation concentration device and separation concentration method
  • Fluorine-containing sulfuric acid separation concentration device and separation concentration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Taking sulfuric acid containing hydrofluoric acid as the raw material liquid, wherein the sulfuric acid is 77.01wt%, the hydrogen fluoride is 12.38wt%, and the water is 10.61wt%; the raw material liquid is placed in figure 1In the concentration device in the separation and concentration device shown, heat to 110°C under the conditions of 10r / min and -50Pa, and heat for 10h to obtain concentrated sulfuric acid and mixed gas; use 8°C chilled water to cool the mixed gas to obtain hydrogen Fluoric acid;

[0080] Carry out component analysis to described concentrated sulfuric acid, the result shows, wherein, sulfuric acid is 90.08wt%, hydrofluoric acid is 0.57wt%, water is 9.35wt%; Carry out component analysis to described hydrofluoric acid, result shows, sulfuric acid is 1.82 wt%, hydrofluoric acid is 81.84wt%, and water is 16.34wt%.

[0081] It can be seen from Example 1 that when the raw material solution is heated to 110° C. under a slight negative pressure of -50 Pa, t...

Embodiment 2

[0083] Taking sulfuric acid containing hydrofluoric acid as the raw material liquid, wherein the sulfuric acid is 76.92wt%, the hydrogen fluoride is 14.53wt%, and the water is 8.55wt%; the raw material liquid is placed in figure 1 In the concentration device in the separation and concentration device shown, heat to 125°C under the conditions of 10r / min and -100Pa, and heat for 15h to obtain concentrated sulfuric acid and mixed gas; use 8°C chilled water to cool the mixed gas to obtain hydrogen Fluoric acid;

[0084] Carry out component analysis to described concentrated sulfuric acid, the result shows, wherein, sulfuric acid is 90.59wt%, hydrofluoric acid is 0.37wt%, water is 9.14wt%; Carry out component analysis to described hydrofluoric acid, result shows, sulfuric acid is 1.86 %, hydrofluoric acid 80.12%, water 17.01%.

[0085] It can be seen from Example 1 that when the raw material solution is heated to 125° C. under a slight negative pressure of -100 Pa, the separation ...

Embodiment 3

[0087] Taking sulfuric acid containing hydrofluoric acid as the raw material liquid, wherein the sulfuric acid is 77.01wt%, the hydrogen fluoride is 12.38wt%, and the water is 10.61wt%; the raw material liquid is placed in figure 1 In the concentration device in the separation and concentration device shown, heat to 120°C under the conditions of 10r / min and -50Pa, and heat for 15h to obtain concentrated sulfuric acid and mixed gas; use 8°C chilled water to cool the mixed gas to obtain hydrogen Fluoric acid;

[0088] Carry out component analysis to described concentrated sulfuric acid, result shows, wherein, sulfuric acid is 92.08wt%, hydrofluoric acid is 0.41wt%, water is 7.51wt%; Carry out component analysis to described hydrofluoric acid, result shows, sulfuric acid is 1.91wt%. wt%, hydrofluoric acid is 74.67wt%, and water is 23.42wt%.

[0089] It can be seen from Example 3 that when the raw material solution is heated to 120° C. under a slight negative pressure of -50 Pa, ...

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Abstract

The invention provides a fluorine-containing sulfuric acid separation concentration method, which comprises the following steps of: providing a raw material liquid which contains sulfuric acid and hydrofluoric acid; and heating the raw material liquid at the pressure of minus 50Pa to minus 100Pa to the temperature of 110-130 DEG C to obtain concentrated sulfuric acid and mixed gases. The invention also provides a fluorine-containing sulfuric acid separation concentration device. According to the invention, when the raw material liquid containing sulfuric acid and hydrofluoric acid are heated at the pressure of minus 50Pa to minus 100Pa to the temperature of 110-130 DEG C, hydrofluoric acid and water in the raw material liquid are separated from sulfuric acid through the form of gaseous hydrogen fluoride and stream, and impurity separation and concentration of sulfuric acid can be simultaneously realized to obtain the mixed gases containing gaseous hydrogen fluoride and concentrated sulfuric acid. The separation concentration method provided by the invention can be used to separate hydrofluoric acid as an impurity from sulfuric acid and simultaneously condense dilute sulfuric acid into concentrated sulfuric acid. The method provided by the invention is simple and has a good separation concentration effect.

Description

technical field [0001] The invention belongs to the technical field of separation and concentration of fluorine-containing sulfuric acid, and in particular relates to a separation and concentration device and a separation and concentration method of fluorine-containing sulfuric acid. Background technique [0002] Sulfuric acid, chemical formula H 2 SO 4 , is a colorless, odorless oily liquid, a strong acid with a high boiling point and low volatility, easily soluble in water, and miscible with water in any ratio. It is an important basic chemical raw material. In modern industrial production, many processes will produce dilute sulfuric acid with low concentration. Concentrating dilute sulfuric acid and recycling it can not only reduce production costs, but also reduce waste liquid discharge and reduce environmental pollution. [0003] Since dilute sulfuric acid is a by-product of many production processes, it generally contains different impurities with different productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90
Inventor 张月和薛明蔡春立李青娟葛中区宿志权窦义虎
Owner FINE SILICON
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