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Prification process

A purification method and hydrogen fluoride technology, applied in the direction of hydrogen fluoride, fluorine/hydrogen fluoride, etc., can solve the problems of high-cost cooling methods, loss of hydrogen fluoride, etc.

Active Publication Date: 2006-06-28
DAVY PROCESS TECH SWITZERLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If using these steps, P 2 o 5 can be reduced to less than 10 ppm, however, in addition to the high operating costs of this system, another disadvantage is that large amounts of hydrogen fluoride are lost in these processes
[0015] In summary, currently contains about 5000wppm P 2 o 5 Fluorspar can only be processed in two ways, expensive cooling methods or commercial methods involving expensive and complex additives
Simply put, if lower grades of fluorspar must be used, there is no easier way to deal with the resulting high levels of impurities

Method used

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  • Prification process

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Embodiment 1

[0038] Contains 0.5%P 2 o 5 The fluorspar and sulfuric acid are fed into a converter together to react to obtain a hydrogen fluoride stream containing sulfuric acid, phosphorus and other impurities. The gas stream is passed through a pre-purifier to obtain a 0.1% H 2 SO 4 and 0.4% P 2 o 5 impure hydrogen fluoride stream. The impure gas stream was introduced into a packed column for contact with a counterflow of cooled 45°C aqueous hydrogen fluoride solution. Almost all gaseous components are cooled in this packed tower, and its liquid product contains 72% hydrogen fluoride, 25% water, 1% H 2 SO 4 and 2%P 2 o 5 . This stream is pumped into a distillation column operating at 3 bar. The working temperature at the top of the distillation column is 65°C, the reflux rate is 2, and then hydrogen fluoride with a purity of 99.99% is obtained. The upper airflow contains only 0.01% water and less than 0.001% P 2 o 5 . The working temperature of the reboiler is 120°C and th...

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Abstract

A method of purifying an impure hydrogen fluoride gas stream containing hydrogen fluoride and phosphorus impurities and being substantially free of sulfuric acid. The method comprises: absorbing the impure gas stream into an aqueous acid solution to form a liquid stream; introducing the liquid stream into a distillation column for distillation to form an upper hydrogen fluoride stream having a lower phosphorus content than the original impure gas stream, and A lower stream containing aqueous acid and impurities.

Description

technical field [0001] The present invention relates to the preparation process of hydrogen fluoride (HF), in particular to the purification of hydrogen fluoride stream containing impurities such as phosphorus-containing compounds to obtain high-purity hydrogen fluoride, and the product of the hydrogen fluoride stream is substantially free of water. Background technique [0002] Hydrogen fluoride is generally composed of CaF 2 prepared from fluorspar ore. A common method for the preparation of hydrogen fluoride from fluorspar is described in Koch's Encyclopedia of Chemistry and Technology (pp. 743-746, third edition, 1980). In this method, sulfuric acid is used to treat fluorspar in a converter. The hot gas stream containing hydrogen fluoride and sulfuric acid produced in the converter is concentrated and purified to remove sulfuric acid. This purification step is generally called pre-purification or pre-condensation. The gas stream produced in the converter is usually at n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/19
CPCC01B7/195C01B7/196
Inventor 罗兰·洛伊青格伯里克利·布劳恩
Owner DAVY PROCESS TECH SWITZERLAND