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Preparation method of hydrogen chloride

A technology of hydrogen chloride and extractant, which is applied in the field of hydrogen chloride preparation, can solve the problems of high cost, excessive consumption, and influence on the effect of phase separation, and achieve the effects of low loss of extractant, stable production process, and avoiding loss

Pending Publication Date: 2021-08-20
福建富仕新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can achieve separation to a certain extent, the loss of the extractant is serious, the consumption is too fast, the cost is high, and there is a third phase in the extraction process, which affects the phase separation effect

Method used

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  • Preparation method of hydrogen chloride

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preparation example Construction

[0027] The invention provides a method for preparing hydrogen chloride, which comprises: using an extractant to extract hydrochloric acid solution to obtain an oil phase containing hydrogen chloride, and then subjecting the oil phase containing hydrogen chloride to vacuum distillation to obtain hydrogen chloride gas; the extractant is selected from Fluorinated phosphate extractant.

[0028] The hydrogen chloride is transferred from the hydrochloric acid solution system to the oil phase through the fluorine-containing phosphate extractant system, and the hydrogen chloride gas and the organic phase can be obtained by vacuum distillation of the oil phase containing hydrogen chloride.

[0029] In one embodiment, the above organic phase can be directly returned to the extractor for recycling.

[0030] In a preferred embodiment of the application of the present invention, the above-mentioned hydrochloric acid solution is a waste hydrochloric acid solution, and the mass fraction of t...

Embodiment 1

[0049] This embodiment provides a kind of preparation method of hydrogen chloride. Specifically, a volume of 1000ml of hydrochloric acid solution with a mass fraction of 5% is added to the extractor, and the hydrochloric acid solution contains 0.01wt.% of iron ions. Esters are used as the extractant. In this example, the oil phase water ratio is set to O / A=1:1, and after three stages of extraction, the oil-rich phase is obtained. Then carry out vacuum distillation in the distillation pot under the conditions of 120°C and -0.1MPa to obtain hydrogen chloride gas, and return the organic phase to the extractor.

Embodiment 2

[0051] This embodiment provides a kind of preparation method of hydrogen chloride. Specifically, a volume of 1000ml of hydrochloric acid solution with a mass fraction of 20% is added to the extractor, and the hydrochloric acid solution contains 0.01wt.% of iron ions and 0.01wt.% of calcium ions. -Trifluoroethyl) phosphate as the extractant, in this embodiment, the oil phase water ratio O / A=1:1 is set, after 3 stages of extraction, the oil-rich phase is obtained, and then in the still at 140 ° C, Under the condition of -0.1MPa, vacuum distillation is carried out to obtain hydrogen chloride gas, and the organic phase is returned to the extractor.

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Abstract

The invention discloses a preparation method of hydrogen chloride, and relates to the field of preparation of hydrogen chloride. The method comprises the following steps: extracting a hydrochloric acid solution by adopting an extracting agent to obtain an oil phase containing hydrogen chloride, and then carrying out reduced pressure distillation on the oil phase containing hydrogen chloride to obtain hydrogen chloride gas. The extraction agent is selected from fluorine-containing phosphate extraction agents. The fluorine-containing phosphate with small polarity and small water solubility of a single component is used as the extraction agent, so that the loss of the extraction agent can be effectively avoided. After the extraction agent is used, the problem of a third phase in the extraction process can be solved at the same time, and the separation of hydrogen chloride can be effectively realized through reduced pressure distillation of an organic extraction phase. The extraction production process is stable and environment-friendly, the loss of the extraction agent is low, and pollution of hydrogen chloride gas caused by volatilization of organic matter in the distillation process of a multi-component organic extraction system is avoided.

Description

technical field [0001] The invention relates to the field of preparation of hydrogen chloride, in particular to a method for preparing hydrogen chloride. Background technique [0002] The recycling of waste hydrochloric acid is an urgent problem of resource recycling in the current hydrochloric acid process titanium dioxide, chlor-alkali, organic silicon and other industries. Waste hydrochloric acid recycling technology includes two aspects: first, use membrane filtration technology to remove impurities in waste hydrochloric acid, which has problems such as high equipment cost, high operating cost, and limited recovery rate of pure hydrochloric acid; second, use waste hydrochloric acid as raw material to prepare Hydrogen chloride is recycled to the production process. The current technology mainly focuses on the research of hydrogen chloride preparation technology, and the preparation technology of hydrogen chloride is divided into distillation method and extractive distill...

Claims

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Application Information

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IPC IPC(8): C01B7/07
CPCC01B7/0731C01B7/0712C01B7/0737
Inventor 费明谢作军张守金谢秉昆
Owner 福建富仕新材料有限责任公司