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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 loss of hydrogen fluoride, high-cost cooling methods, etc.

Active Publication Date: 2011-07-06
DAVY PROCESS TECH SWITZERLAND
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  • Abstract
  • Description
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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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Embodiment 1

[0038] With 0.5%P 2 O 5 The fluorspar and sulfuric acid are added to a converter together, and the hydrogen fluoride stream containing sulfuric acid, phosphorus and other impurities is obtained by the reaction. The gas stream was passed through a prepurifier to obtain a 2 SO 4 and 0.4%P 2 O 5 impure hydrogen fluoride stream. The impure gas stream was introduced into a packed column to contact a counter-flowing 45°C cooled 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 was pumped into a distillation column with a working pressure of 3 bar. The operating temperature at the top of the distillation column was 65°C, the reflux rate was 2, and then hydrogen fluoride with a purity of 99.99% was obtained. The upper air stream contains only 0.01% water and less than 0.001% P 2 O 5 . The working temperature of the re...

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Abstract

A process for the purification of an impure gaseous hydrogen fluoride stream, said stream comprises hydrogen fluoride and phosphorous impurities, and being substantially free of sulphuric acid, the process comprises: absorbing the impure gaseous stream into an aqueous acid solution to form a liquid stream; introducing the liquid stream to a distillation column for distillation to form an overheadstream of hydrogen fluoride having a lower phosphorous content than the impure stream and a bottoms stream comprising aqueous acid and impurities.

Description

technical field [0001] The present invention relates to a process for the preparation of hydrogen fluoride (HF), in particular to the purification of a hydrogen fluoride stream containing impurities such as phosphorus-containing compounds to obtain high-purity hydrogen fluoride, the hydrogen fluoride stream product being substantially free of water. Background technique [0002] Hydrogen fluoride is generally composed of CaF-containing 2 prepared from fluorspar ore. A common method for the preparation of hydrogen fluoride from fluorspar is described in the Coriolis Encyclopedia of Chemical Technology (pp. 743-746, 3rd edition 1980). In this method, fluorspar is treated with sulfuric acid in a converter. The hot gas stream containing hydrogen fluoride and sulfuric acid generated in the converter is concentrated and purified to remove sulfuric acid. This purification step is generally called pre-purification or pre-condensation. The bottom is injected into a packed column, a...

Claims

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Application Information

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Patent Type & Authority Patents(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
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