Process for concentrating aqueous hydrogen halide solutions

A hydrogen halide and solution technology, applied in chemical instruments and methods, chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., can solve problems such as equipment failure, unexpected crystallization of extractant, blockage of evaporation device, etc., and achieve high usable energy The effect of content

Active Publication Date: 2017-07-11
SGL CARBON SE
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  • Abstract
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Problems solved by technology

Therefore, especially in the final evaporation stage, there is a risk of undesired crystallization of the extractant, which may cause the evaporation plant and, in the process, downstream of it in the process to become clogged, thus possibly causing a complete failure of the plant
Furthermore, the crystallized extractant has to be removed in a complex manner, which requires a high level of technical complexity and high labor costs and equipment downtime

Method used

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  • Process for concentrating aqueous hydrogen halide solutions

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Embodiment Construction

[0076] The apparatus 10 for concentrating an aqueous starting solution of hydrogen halide shown in the drawing comprises: a distillation unit 12 designed as a rectification column 12, an evaporation unit 14 and a heat exchanger for heating the bottom product of the rectification column 12 16.

[0077] A feed line 18 for an aqueous hydrogen halide solution containing an extractant opens into the upper part of the rectification column 12, said solution being pre-generated in the mixing device 20 via feed line 18' into The hydrogen halide aqueous starting solution of the mixing device 20 is mixed with the concentrated extractant-containing aqueous solution from the evaporation device 14 and fed to the mixing device 20 via the return line 22 .

[0078] On the lower part or bottom of the rectification column 12 there is provided a removal line 24 for the solution containing the extractant, said line being provided with a pump 26 and fed into the evaporation device 14 . On the one ...

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Abstract

The present invention relates to a method for concentrating an aqueous starting solution of hydrogen halide, in particular hydrochloric acid, comprising the following steps: - in a distillation unit (12), in the presence of an extractant, the aqueous starting solution of hydrogen halide extractive distillation of the solution, removal of hydrogen halide vapor and / or hydrogen halide gas (38) from the upper section of the distillation unit, removal of the extractant-containing solution (24) from the lower section of the distillation unit, - concentration of the extractant-containing solution removed from the lower section of the distillation device in the evaporation device (14), and - return of the extractant-containing solution concentrated in the evaporation device to the distillation device (22), · wherein said extractant-containing solution removed from the lower stage of the distillation device is concentrated by evaporation in said evaporation device at a pressure higher than atmospheric pressure.

Description

technical field [0001] The invention relates to a method for concentrating aqueous hydrogen halide solutions, especially hydrochloric acid, and a system for concentrating aqueous hydrogen halide solutions. Background technique [0002] Aqueous solutions of hydrogen halides such as hydrochloric acid accumulate in many processes, for example during production processes in the chemical industry and during waste incineration. In these cases, the solution is generally a relatively dilute solution that cannot be easily re-used since many chemical processes require the use of highly concentrated hydrogen halide solutions or even hydrogen halide gases. Furthermore, the transport costs of dilute solutions of this type are relatively high compared to the costs of more concentrated solutions, since large volumes of dilute hydrogen halide solutions have to be transported in terms of the amount of hydrogen halide species. Therefore, there is a need to concentrate dilute aqueous hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/07
CPCC01B7/0712C01B7/0731C01B7/0737B01D3/40C01B7/00
Inventor 彼得·珀尔曼马库斯·弗兰兹安德里·布科罗尔夫·安布拉萨特
Owner SGL CARBON SE
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