Anhydrous hydrofluoric acid dechlorination process

Abstract

The invention discloses a dechlorination process of anhydrous hydrofluoric acid. The invention comprises the following steps: the first step: introducing anhydrous hydrofluoric acid into a capsule filter device; the second step: the anhydrous hydrofluoric acid is filtered through a first filter plate; the third step: the anhydrous hydrofluoric acid is filtered through a second filter plate; the fourth step: the anhydrous hydrofluoric acid is filtered through a reverse osmosis membrane. The invention performs primary filtration on the anhydrous hydrofluoric acid through a first filter plate inside the capsule filter device, thereby removing metal impurities in the anhydrous hydrofluoric acid, and then performs secondary filtration on the anhydrous hydrofluoric acid through a second filter plate to remove solid impurities in the anhydrous hydrofluoric acid, and finally performs tertiary filtration on the anhydrous hydrofluoric acid through a reverse osmosis membrane to filter the chloride ions in the anhydrous hydrofluoric acid, and the anhydrous hydrofluoric acid that has been decontaminated is exported out of the capsule filter device.

Description

Technical Field

[0001] The invention relates to the technical field of hydrofluoric acid preparation, in particular to an anhydrous hydrofluoric acid dechlorination process. Background Art

[0002] During the production process, anhydrous hydrofluoric acid contains a small amount of metal impurities and solid impurities, as well as a small amount of chloride ions. There is no impurity removal process in the traditional anhydrous hydrofluoric acid production process. During production, the staff adjusts the concentration of anhydrous hydrofluoric acid to affect the effect of the anhydrous hydrofluoric acid due to the impurities in the anhydrous hydrofluoric acid. If the anhydrous hydrofluoric acid has a high level of impurities, the anhydrous hydrofluoric acid may not achieve the corresponding effect, causing the batch of anhydrous hydrofluoric acid to be scrapped, thereby increasing the cost of anhydrous hydrofluoric acid production. Summary of the invention

[0003] The object of the present invention is to provide a process for dechlorination by using anhydrous hydrofluoric acid to solve the problems mentioned in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a process for dechlorination by anhydrous hydrofluoric acid, comprising the following steps:

[0005] Step 1: Introduce anhydrous hydrofluoric acid into the capsule filtration equipment;

[0006] Step 2: anhydrous hydrofluoric acid is filtered through the first filter plate;

[0007] Step 3: Anhydrous hydrofluoric acid is filtered through the second filter plate;

[0008] Step 4: Anhydrous hydrofluoric acid is filtered through a reverse osmosis membrane in three stages.

[0009] Preferably, the first filter plate has a filtration accuracy of 0.2 μm, which can remove metal impurities in anhydrous hydrofluoric acid.

[0010] Preferably, the second filter plate has a filtration accuracy of 0.1 μm, which can remove solid impurities in anhydrous hydrofluoric acid.

[0011] Preferably, the chloride ion removal reverse osmosis membrane removes chloride ions in anhydrous hydrofluoric acid.

[0012] Preferably, the capsule filter device is made of polytetrafluoroethylene material.

[0013] Compared with the prior art, the present invention has the beneficial effects that: the anhydrous hydrofluoric acid dechlorination process removes metal impurities, solid impurities and chloride ions in the anhydrous hydrofluoric acid through the cooperation between the first filter plate, the second filter plate and the reverse osmosis membrane, so that the impurities in the anhydrous hydrofluoric acid will not affect the effect of the anhydrous hydrofluoric acid, and the anhydrous hydrofluoric acid can achieve the corresponding effect, avoiding the scrapping of the anhydrous hydrofluoric acid, thereby reducing the production cost of the anhydrous hydrofluoric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a practical process flow chart. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1 The present invention provides an embodiment of a process for removing chlorine with anhydrous hydrofluoric acid, comprising the following steps:

[0017] Step 1: Introduce anhydrous hydrofluoric acid into the capsule filtration equipment;

[0018] Step 2: anhydrous hydrofluoric acid is filtered through the first filter plate;

[0019] Step 3: Anhydrous hydrofluoric acid is filtered through the second filter plate;

[0020] Step 4: Anhydrous hydrofluoric acid is filtered through a reverse osmosis membrane in three stages.

[0021] In this embodiment, the filtering accuracy of the first filter plate is 0.2 μm, and the metal impurities in the anhydrous hydrofluoric acid are removed.

[0022] In this embodiment, the filtering accuracy of the second filter plate is 0.1 μm, and solid impurities in the anhydrous hydrofluoric acid are removed.

[0023] In this embodiment, the chloride ion removal reverse osmosis membrane removes chloride ions in anhydrous hydrofluoric acid.

[0024] In this embodiment, the capsule filter device is composed of polytetrafluoroethylene material.

[0025] Working principle: The staff introduces anhydrous hydrofluoric acid into the capsule filter equipment, and performs primary filtration on the anhydrous hydrofluoric acid through the first filter plate inside the capsule filter equipment to remove metal impurities in the anhydrous hydrofluoric acid, and then performs secondary filtration on the anhydrous hydrofluoric acid through the second filter plate to remove solid impurities in the anhydrous hydrofluoric acid. Finally, the anhydrous hydrofluoric acid is passed through a reverse osmosis membrane for tertiary filtration to filter the chloride ions in the anhydrous hydrofluoric acid, and the anhydrous hydrofluoric acid with impurities removed is exported from the capsule filter equipment.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An anhydrous hydrofluoric acid dechlorination process, characterized in that: The following steps are involved: Step 1: Introduce anhydrous hydrofluoric acid into the capsule filtration equipment; Step 2: anhydrous hydrofluoric acid is filtered through the first filter plate; Step 3: Anhydrous hydrofluoric acid is filtered through the second filter plate; Step 4: Anhydrous hydrofluoric acid is filtered through a reverse osmosis membrane in three stages.

2. A process for dechlorination using anhydrous hydrofluoric acid according to claim 1, characterized in that: The first filter plate has a filtration accuracy of 0.2 μm and can remove metal impurities in anhydrous hydrofluoric acid.

3. A process for dechlorination by anhydrous hydrofluoric acid according to claim 1, characterized in that: The second filter plate has a filtration accuracy of 0.1 μm and removes solid impurities in anhydrous hydrofluoric acid.

4. A process for dechlorination using anhydrous hydrofluoric acid according to claim 1, characterized in that: The chloride ion removal reverse osmosis membrane removes chloride ions in anhydrous hydrofluoric acid.

5. A process for dechlorination using anhydrous hydrofluoric acid according to claim 1, characterized in that: The capsule filter device is made of tetrafluoroethylene material.

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