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Apparatus for generating fluorine gas

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Apparatus for generating fluorine gas


[Solving means] A fluorine gas generating system characterized by including a purification apparatus 20 for adsorbing and removing hydrogen fluoride vaporized from a molten salt of an electrolysis tank 1 and mixed in fluorine gas generated at an anode 7, in which the purification apparatus 20 includes a cylindrical member through which main-product gas containing fluorine gas generated in the electrolysis tank 1 flows, a temperature regulator for regulating temperature of the cylindrical member, and an adsorbent holder disposed inside the cylindrical member, the adsorbent holder being disposed to form an aperture for securing a flow passage of the main-product gas inside the cylindrical member. [Object] To provide a fluorine gas generating system which can stably supply high purity fluorine gas while preventing blockade of a purification apparatus for adsorbing and removing hydrogen fluoride.

Browse recent Central Glass Company, Limited patents - Ube-shi, JP
Inventors: Tatsuo Miyazaki, Akifumi Yao, Takuya Kita
USPTO Applicaton #: #20120318665 - Class: 2042431 (USPTO) - 12/20/12 - Class 204 
Chemistry: Electrical And Wave Energy > Apparatus >Electrolytic >Cells >Fused Bath

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The Patent Description & Claims data below is from USPTO Patent Application 20120318665, Apparatus for generating fluorine gas.

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TECHNICAL FIELD

This invention relates to a fluorine gas generating system for generating fluorine gas.

BACKGROUND TECHNIQUE

Hitherto the following fluorine gas generating system has been known: The fluorine gas generating system includes an electrolysis tank in which hydrogen fluoride is electrolyzed in an electrolysis bath including a molten salt containing hydrogen fluoride so that a main-product gas whose main component is fluorine gas is generated at an anode side while a by-product gas whose main component is hydrogen gas is generated at a cathode side.

In the fluorine gas generating system of this kind, hydrogen fluoride gas vaporized from the molten salt is mixed in fluorine gas generated at the anode of the electrolysis tank. Therefore, in order to separate hydrogen fluoride gas from gas generated at the anode so as to purify fluorine gas, a purification apparatus having a treatment cylinder filled with adsorbent such as sodium fluoride (Nan or the like is provided.

Fluorine and hydrogen gases generated from the electrolysis tank contain hydrogen fluoride vaporized from the molten salt contained in the electrolysis tank and mist components of the molten salt itself. These components cause deterioration of the adsorbent. Particularly with hydrogen fluoride having a high concentration, the adsorbent near a treatment cylinder inlet may make its expansion or fusion, thereby resulting in clogging of the adsorbent. When such clogging arises, flow of gas is suppressed thereby causing a blockade, which is problematic.

As a technique for solving this problem, Patent Citation 1 discloses such a technique that a separating means is provided to form a space between a gas introduction opening and adsorbent in a purification apparatus filled with the adsorbent such as sodium fluoride (NaF) or the like, in which liquid drops of the mist components are released and settled within this space, thus forming a configuration in which the adsorbent and the liquid drops of the mist components are hard to contact with each other, thereby suppressing clogging of the adsorbent and reducing the frequency of maintenance of the purification apparatus.

PRIOR ART CITATIONS Patent Citation

Patent Citation 1: Japanese Patent Provisional Publication No. 2009-215588

SUMMARY

OF THE INVENTION Problems to be Solved by Invention

However, in case that the fluorine gas generating system is operated for a long time or in case that the flow rate of generated gas is large, the amount of hydrogen fluoride gas and mist components contacting with the adsorbent increases with the prolonged operation time of the system or the increased amount of the gas and mist components. Therefore, in a configuration using the purification apparatus which is compactly filled with the adsorbent as described in Patent Citation 1, if clogging of the adsorbent once arises, flow path for gas cannot be secured so as to block the purification apparatus, thus interrupting a continuous operation of the fluorine gas generating system, which is problematic.

Thus, it is difficult to completely prevent blockade inside the purification apparatus with a configuration of being compactly filled with adsorbent for adsorbing hydrogen fluoride in a purification apparatus for adsorbing and removing hydrogen fluoride contained in fluorine gas and hydrogen gas generated in an electrolysis tank of a conventional fluorine gas generating system.

The present invention has been made in view of the above problems and has an object to provide a fluorine gas generating system which can stably supply high purity fluorine gas while preventing blockade of a purification apparatus for adsorbing and removing hydrogen fluoride.

The present inventors have made eager studies in order to solve the above-discussed problems. As a result, they have found to be able to stably supply high purity fluorine gas while preventing blockade within a purification apparatus by providing an adsorbent holder inside a cylindrical member disposed in the purification apparatus for adsorbing and removing hydrogen fluoride and allowing gas generated in an electrolysis tank to flow therethrough, and further by disposing this adsorbent holder in such a manner as to form an aperture for securing a gas flow passage for gas flowing through the inside of the cylindrical member, in an inside space of the cylindrical member, and reached the present invention.

That is, the present invention is a fluorine gas generating system for generating fluorine gas by electrolyzing hydrogen fluoride in a molten salt containing hydrogen fluoride, characterized by comprising: an electrolysis tank in which hydrogen fluoride is electrolyzed in an electrolysis bath including the molten salt containing hydrogen fluoride to generate a main-product gas whose main component is fluorine gas at an anode side and a by-product gas whose main component is hydrogen gas at a cathode side; and a purification apparatus in which hydrogen fluoride mixed in the main-product gas is removed by an adsorbent, wherein the purification apparatus includes a cylindrical member through which the main-product gas passes, a temperature regulator for regulating a temperature of the cylindrical member, and an adsorbent holder disposed inside the cylindrical member, the adsorbent holder being disposed to form an aperture for securing a flow passage of the main-product gas inside the cylindrical member.

Additionally, the present invention is a fluorine gas generating system characterized in that the adsorbent holder includes plural or more adsorbent holders disposed to meander the flow passage of the main-product gas.

Additionally, the present invention is a fluorine gas generating system characterized in that the adsorbent holder is a tray-like member, the tray-like member including a bottom plate section formed with a cutout section for allowing gas to flow therethrough, an outer periphery side wall section disposed standing at outer periphery of the bottom plate section except for the cutout section, and a cutout side wall section disposed standing at a cutout section side of the bottom plate section, and an upper end opening section of a main body of the tray-like member, and in that the outer periphery side wall section is disposed to internally contact with inner wall of the cylindrical member.

Additionally, the present invention is a fluorine gas generating system characterized in that the bottom plate section is formed with a through-hole.

Additionally, the present invention is a fluorine gas generating system characterized in that the adsorbent holder includes plural or more adsorbent holders disposed separate from each other in the cylindrical member, wherein a distance between the tray-like member and the adjacent tray-like member is not less than ⅕ of inner diameter of the cylindrical member and less than the inner diameter of the cylindrical member.

Additionally, the present invention is a fluorine gas generating system characterized in that an area of the bottom plate section formed with the cutout section is not less than 50% and not more than 95% of an area of an inner diameter section of the cylindrical member.

Effects of the Invention

According to the present invention, an aperture which is not filled with the adsorbent is formed inside the cylindrical member disposed in the purification apparatus and allowing gas generated in the electrolysis tank to flow therethrough, so as to provide a configuration for always securing a gas flow passage. Accordingly, the present invention can provide a fluorine gas generating system which can stably supply high purity fluorine gas without causing blockade even in case that a part of the adsorbent makes its clogging.

BRIEF DESCRIPTION OF THE DRAWINGS



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stats Patent Info
Application #
US 20120318665 A1
Publish Date
12/20/2012
Document #
13574177
File Date
02/24/2011
USPTO Class
2042431
Other USPTO Classes
International Class
/
Drawings
6



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