WO2017110412A1 - 塩化水素混合物及びその製造方法並びに充填容器 - Google Patents
塩化水素混合物及びその製造方法並びに充填容器 Download PDFInfo
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- WO2017110412A1 WO2017110412A1 PCT/JP2016/085801 JP2016085801W WO2017110412A1 WO 2017110412 A1 WO2017110412 A1 WO 2017110412A1 JP 2016085801 W JP2016085801 W JP 2016085801W WO 2017110412 A1 WO2017110412 A1 WO 2017110412A1
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- hydrogen chloride
- chloride mixture
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
- C01B7/0718—Purification ; Separation of hydrogen chloride by adsorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/12—Vessels not under pressure with provision for protection against corrosion, e.g. due to gaseous acid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
- F17C2203/0639—Steels
- F17C2203/0643—Stainless steels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Definitions
- the present invention relates to a hydrogen chloride mixture, a method for producing the mixture, and a filled container.
- Hydrogen chloride is used as an etching gas, a cleaning gas, or a film forming gas when manufacturing a semiconductor or the like.
- a film-forming gas When used as a film-forming gas, if impurities are contained, impurities remain in the film, so that high-purity hydrogen chloride is required, and there is an increasing demand for quality improvement.
- the hydrogen chloride gas filled in the filling container has the following problems.
- hydrogen chloride contains a small amount of moisture that is difficult to remove in the manufacturing process, but even if high-purity hydrogen chloride having a sufficiently low moisture concentration is filled in the filling container, Since the water is concentrated inside, there is a possibility that hydrogen chloride gas having a low water concentration is released from the filling container. This problem will be described in detail below.
- the liquid hydrogen chloride which is a liquid phase
- water with a vapor-liquid equilibrium constant of about 0.1 is less evaporated than hydrogen chloride, so it tends to remain on the liquid phase side, and the water is concentrated in the filling container as hydrogen chloride gas is released. It will be done. Therefore, the amount of water accompanying hydrogen chloride gas is very small at the beginning of the release, and the water concentration of hydrogen chloride gas is sufficiently low, but gradually accompanying hydrogen chloride gas as the liquid phase decreases due to evaporation. The water content increases and the water concentration of hydrogen chloride gas increases.
- the liquid phase has a water concentration of about 8 mol ppm when the filling of the filling container is completed, but the water content increases with the release of hydrogen chloride gas from the filling container.
- the water concentration in the gas phase rises to 40 mol ppm.
- Products with lower moisture concentration are also available on the market, but the moisture concentration in the liquid phase at the time of filling the filling container is about 2 mol ppm, and the total amount of liquefied hydrogen chloride was finally gasified.
- the moisture concentration in the gas phase in the state is 10 mol ppm.
- Patent Document 1 discloses that dry hydrogen chloride gas released from a cylinder filled with liquefied hydrogen chloride is cooled, and excess water is condensed and separated from the accompanying water. A technique for obtaining hydrogen chloride gas is disclosed.
- the technique disclosed in Patent Document 1 requires a cooling device partitioned by a heat transfer surface that can exchange heat between hydrogen chloride gas and a refrigerant, and a recovery container that recovers condensed water as hydrochloric acid. Therefore, there was a problem that the facilities were complicated.
- Patent Document 1 describes that the above dehydration method can be applied to a hydrogen chloride purification process. Therefore, if this is applied, it is considered that dry liquefied hydrogen chloride can be obtained by compressing and liquefying after dehydration and filling the filled container. According to Patent Document 1, it is considered that the water concentration can be reduced to 0.05 mol ppm by reducing the cooling temperature to -70 ° C.
- an object of the present invention is to solve the above-mentioned problems of the prior art and provide a hydrogen chloride mixture that hardly corrodes a metal and a method for producing the same.
- Another object of the present invention is to provide a filled container filled with a hydrogen chloride mixture that hardly corrodes metals.
- a hydrogen chloride mixture containing hydrogen chloride and water which is filled in a filling container so that at least a part thereof is liquid, and the moisture concentration in the gas phase is 0.001 mol ppm or more. Hydrogen chloride mixture that is less than 5 mol ppm.
- a hydrogen chloride mixture containing hydrogen chloride and water which is filled in a filling container so that at least a part thereof is liquid, and the water concentration in the liquid phase is 0.01 mol ppm or more and 1 mol Hydrogen chloride mixture that is less than ppm.
- the ratio V / G 0 of the internal volume V (unit: L) of the filling container to the initial filling amount G 0 (unit: kg) of the filling container is 1.67 or more and 2.40 or less [1. ]
- a method for producing a hydrogen chloride mixture containing hydrogen chloride and water A first dehydration step of cooling a hydrogen chloride mixture having a water concentration of 1 mol ppm or more, and condensing and separating water in the hydrogen chloride mixture; A second dehydration step in which the hydrogen chloride mixture obtained in the first dehydration step is brought into contact with a moisture adsorbent and the moisture concentration is less than 0.5 mol ppm; Filling the filling container with the hydrogen chloride mixture obtained in the second dehydration step so that at least part of the mixture becomes liquid and the water concentration in the liquid phase at the time of filling is 0.01 mol ppm or more and less than 1 mol ppm. Filling process A method for producing a hydrogen chloride mixture comprising:
- the ratio V / G 0 of the internal volume V (unit: L) to the initial filling amount G 0 (unit: kg) of the hydrogen chloride mixture is 1.67 or more and 2.40 or less [7] or [8 ]
- the moisture concentration in hydrogen chloride is regulated in order to suppress metal corrosion by hydrogen chloride.
- the corrosion of metals by hydrogen chloride is strongly influenced by the moisture concentration, the influence of the moisture concentration at the ppm level has not been clarified.
- the hydrogen chloride mixture of this embodiment contains hydrogen chloride and water.
- the hydrogen chloride mixture is filled in the filling container so that at least part of the hydrogen chloride mixture is liquid, and the moisture concentration in the gas phase is 0.001 mol ppm or more and less than 4.5 mol ppm. Moreover, the water concentration of the liquid phase is 0.01 mol ppm or more and less than 1 mol ppm.
- the filling container of this embodiment is a filling container filled with a hydrogen chloride mixture containing hydrogen chloride and water.
- the filling container is filled with a hydrogen chloride mixture so that at least a part thereof is liquid, and the moisture concentration in the gas phase is 0.001 mol ppm or more and less than 4.5 mol ppm.
- the water concentration of the liquid phase is 0.01 mol ppm or more and less than 1 mol ppm.
- the moisture concentration of the gas phase and the liquid phase is the moisture concentration of the gas phase and the liquid phase from the time when the filling of the hydrogen chloride mixture into the filling container to the time when almost the entire amount of the hydrogen chloride mixture in the filling container is released. It is.
- the water concentration in the liquid phase is 0.01 mol ppm or more and less than 1 mol ppm, preferably 0.01 mol ppm or more and 0.95 mol ppm or less, more preferably 0.01 mol ppm or more and 0.45 mol or less. ppm or less, more preferably 0.01 mol ppm or more and 0.05 mol ppm or less.
- the hydrogen chloride mixture released from the filling vessel even if the water is concentrated on the liquid phase side with the release of the hydrogen chloride mixture gas from the filling vessel
- the moisture concentration of the gas is maintained at a level (eg, less than 4.5 mol ppm) at which metal corrosion is suppressed until the end of discharge.
- a level eg, less than 4.5 mol ppm
- the hydrogen chloride mixture in the filling container and the hydrogen chloride mixture gas released from the filling container have a low moisture concentration and are unlikely to corrode metals as described above. Therefore, a metal such as stainless steel can be used in a portion where the hydrogen chloride mixture in the filling container and the hydrogen chloride mixture gas released from the filling container come into contact.
- the portion in contact with the hydrogen chloride mixture in the hydrogen chloride mixture filling container, piping, manufacturing apparatus, supply apparatus, transport apparatus, reaction apparatus and the like can be made of a metal such as stainless steel.
- the kind of stainless steel which can be used is not specifically limited, SUS316, SUS316L, SUS304, SUS304L, etc. are mention
- the initial filling amount G 0 (unit: kg) of the hydrogen chloride mixture into the filling container is not particularly limited, but the filling container specified in Article 48, Paragraph 4 of the High Pressure Gas Safety Law
- the upper limit value of the mass calculated according to the internal volume V may be 70% or more and 100% or less.
- the ratio V / G 0 of the internal volume V (unit: L) of the filling container to the initial filling amount G 0 (unit: kg) of the hydrogen chloride mixture to the filling container is not particularly limited. 1.67 or more and 2.40 or less.
- the ratio V / G 0 is 1.67 or more (that is, the initial filling amount G 0 of the hydrogen chloride mixture into the filling container is 100% or less of the upper limit value of the mass calculated according to the internal volume V of the filling container) If so, it is safe because filling the filling vessel with the hydrogen chloride mixture does not overfill.
- the ratio V / G 0 is 2.40 or less (that is, the initial filling amount G 0 of the hydrogen chloride mixture into the filling container is 70, which is the upper limit of the mass calculated according to the inner volume V of the filling container.
- the ratio V / G 0 of the internal volume V (unit: L) of the filling container to the initial filling amount G 0 (unit: kg) of the hydrogen chloride mixture to the filling container is more than 1.70 and less than 2.13. Preferably, it is 1.74 or more and 1.88 or less.
- water is removed from a hydrogen chloride mixture gas having a water concentration of 1 mol ppm or more in a two-stage dehydration process, thereby obtaining a hydrogen chloride mixture gas having a water concentration of less than 0.5 mol ppm.
- the hydrogen chloride mixture gas having a moisture concentration of 1 mol ppm or more is cooled, and the moisture in the hydrogen chloride mixture gas is condensed and separated.
- the hydrogen chloride mixture gas dehydrated in the first dehydration step is brought into contact with the moisture adsorbent to further dehydrate the moisture concentration to less than 0.5 mol ppm.
- the type of moisture adsorbent is not particularly limited.
- zeolite, activated carbon, silica gel, diphosphorus pentoxide may be used. can give.
- the type of zeolite is not particularly limited, and the ratio of silica to alumina and the pore diameter of the pores contained in the zeolite are not particularly limited, but those having resistance to hydrogen chloride are preferable.
- molecular sieve 3A And high silica zeolite are examples of molecular sieve 3A And high silica zeolite.
- the hydrogen chloride mixture gas having a water concentration of less than 0.5 mol ppm by the first dehydration step and the second dehydration step is compressed in the filling step, and filled in, for example, a filling container having a capacity of 1 L or more and 2000 L or less.
- the hydrogen chloride mixture gas is compressed and filled so that at least a part of the hydrogen chloride mixture gas becomes liquid and the moisture concentration of the liquid phase at the time of filling is 0.01 mol ppm or more and less than 1 mol ppm.
- the method of compressing the hydrogen chloride mixture gas and filling it into the filling container is not limited. After removal, a method of storing in a product tank, transferring from the product tank to a filling container, and filling is used.
- the capacity of the filling container can be 1 L or more and 2000 L or less, preferably 2 L or more and 1800 L or less, more preferably 3 L or more and 1500 L or less. If the capacity of the filling container is 1 L or more, the amount of hydrogen chloride mixture that can be used is large, so that the efficiency is excellent. On the other hand, when the capacity of the filling container is 2000 L or less, the filling container can be easily manufactured and transported.
- the temperature of the filling container is not particularly limited, but the filling container may be cooled in advance to ⁇ 90 ° C. or more and 0 ° C. or less. Furthermore, if moisture remains in the filling container, the moisture concentration of the filled hydrogen chloride mixture increases, so that the remaining moisture content in the filling container is preliminarily heated so that it becomes 0.1 mol ppm or less. A decompression process may be performed.
- the ratio V / G 1 of the internal volume V (unit: L) of the filling container to the filling amount G 1 (unit: kg) of the hydrogen chloride mixture into the filling container in the filling step is not particularly limited. 1.67 or more and 11.8 or less. If the ratio V / G 1 is 1.67 or more, it is safe because the filling of the hydrogen chloride mixture into the filling container does not cause overfilling. On the other hand, if the ratio V / G 1 is 11.8 or less, the hydrogen chloride mixture is liquefied.
- the ratio V / G 1 of the internal volume V (unit: L) of the filling container to the filling amount G 1 (unit: kg) of the hydrogen chloride mixture in the filling process is 1.67 or more and 3.13 or less. Is more preferably 1.67 or more and 2.40 or less.
- the method of measuring the water concentration of the hydrogen chloride mixture in each step (first dehydration step, second dehydration step, and filling step) of the method of manufacturing the hydrogen chloride mixture of the present embodiment is accurate to about 0.01 mol ppm.
- the method is not particularly limited as long as it is a measurable method.
- a method using a mirror-cooled dew point meter, a Fourier transform infrared spectrophotometer (FT-IR), a phosphorus pentoxide moisture meter, or a cavity ring-down spectroscopy (CRDS) spectroscopy a method using a mirror-cooled dew point meter, a Fourier transform infrared spectrophotometer (FT-IR), a phosphorus pentoxide moisture meter, or a cavity ring-down spectroscopy (CRDS) spectroscopy).
- FT-IR Fourier transform infrared spectrophotometer
- CRDS cavity ring-down spectroscopy
- the water concentration in the present invention is measured by cavity ring-down spectroscopy after taking a sample from the gas phase portion of the filling container in the case of the gas phase.
- the sample is taken out from the liquid phase portion of the filled container and then gasified, and measured by cavity ring-down spectroscopy as in the case of the gas phase.
- a hydrogen chloride mixture having a very low moisture concentration and hardly corroding metals such as stainless steel can be produced with simple equipment.
- the hydrogen chloride mixture produced by the method for producing a hydrogen chloride mixture of the present embodiment can be used as an etching gas and a cleaning gas when producing a semiconductor or a thin film transistor.
- the hydrogen chloride mixture obtained by the method for producing a hydrogen chloride mixture of this embodiment is extremely useful.
- the hydrogen chloride mixture obtained by the method for producing a hydrogen chloride mixture of the present embodiment can be used for the production of various chemicals such as pharmaceuticals and dye intermediates.
- this embodiment shows an example of this invention and this invention is not limited to this embodiment.
- various changes or improvements can be added to the present embodiment, and forms to which such changes or improvements are added can also be included in the present invention.
- Example 1 25 kg of a hydrogen chloride mixture containing hydrogen chloride and water was charged into a 47 L capacity container so that a part thereof was liquid.
- the hydrogen chloride mixture in the filling container was divided into a gas phase and a liquid phase, and the water concentration in the liquid phase at the completion of filling was 0.80 mol ppm.
- the gas phase was extracted from the filling container at a release rate of 2 L / min until the remaining amount of the hydrogen chloride mixture in the filling container reached 3 kg. In this state, the liquid phase in the filled container disappeared, the entire amount of the hydrogen chloride mixture was gasified, and the water concentration was 4.0 mol ppm.
- a test piece made of SUS316L having a rectangular shape (width 10 mm, length 50 mm, thickness 1 mm) was prepared, and after measuring the mass, it was hung in a pressure vessel using a Teflon (registered trademark) string.
- the hydrogen chloride mixture gas having a water concentration of 4.0 mol ppm was introduced into the pressure vessel, and the internal pressure was set to 0.5 MPaG.
- the pressure vessel was allowed to stand for 5 days in a state heated to 100 ° C., then thoroughly purged with N 2 , and after confirming that the hydrogen chloride concentration was less than 0.1 mol ppm, the pressure vessel was opened. Was taken out. The taken out test piece was ultrasonically washed with ultrapure water and a 10% by mass nitric acid aqueous solution for 10 minutes each, then the mass was measured, and the corrosion rate was calculated from the mass change. As a result, the corrosion rate was 1.0 ⁇ m / y.
- Example 2 A hydrogen chloride mixture gas having a moisture concentration of 2.0 mol ppm was obtained by performing the same operation as in Example 1 except that the moisture concentration of the liquid phase at the completion of filling the filling vessel was 0.40 mol ppm. .
- the corrosion rate of the test piece was measured by performing the same operation as in Example 1 except that this hydrogen chloride mixture gas was used, and it was 0.81 ⁇ m / y.
- Example 3 A hydrogen chloride mixture gas having a water concentration of 0.25 mol ppm was obtained by performing the same operation as in Example 1 except that the liquid phase had a water concentration of 0.050 mol ppm when the filling of the filling vessel was completed. .
- the corrosion rate of the test piece was measured by performing the same operation as in Example 1 except that this hydrogen chloride mixture gas was used, and it was 0.52 ⁇ m / y.
- Example 4 A hydrogen chloride mixture gas having a water concentration of 0.050 mol ppm was obtained by performing the same operation as in Example 1 except that the water concentration of the liquid phase at the completion of filling the filling vessel was 0.010 mol ppm. .
- the corrosion rate of the test piece was measured by performing the same operation as in Example 1 except that this hydrogen chloride mixture gas was used, and it was 0.44 ⁇ m / y.
- Example 1 A hydrogen chloride mixture gas having a water concentration of 5.0 mol ppm was obtained by performing the same operation as in Example 1 except that the water concentration of the liquid phase at the completion of filling the filling vessel was 1.0 mol ppm. .
- the corrosion rate of the test piece was measured by performing the same operation as in Example 1 except that this hydrogen chloride mixture gas was used, and it was 7.4 ⁇ m / y.
- Example 2 A hydrogen chloride mixture gas having a water concentration of 10 mol ppm was obtained in the same manner as in Example 1 except that the water concentration in the liquid phase at the completion of filling the filling vessel was 2.0 mol ppm.
- the corrosion rate of the test piece was measured by performing the same operation as in Example 1 except that this hydrogen chloride mixture gas was used, and it was 54 ⁇ m / y.
- Example 5 Next, the Example of the manufacturing method of the hydrogen chloride mixture whose water concentration is less than 1 mol ppm is shown.
- a crude hydrogen chloride mixture gas having a water concentration of 1000 mol ppm is sent to a cooling condenser at a flow rate of 320 m 3 / h, cooled to ⁇ 10 ° C. to condense the water in the crude hydrogen chloride mixture gas, and crude chloride Part of the water in the hydrogen mixture gas was removed.
- the crude hydrogen chloride mixed gas from which a part of the moisture was removed was sent to the moisture adsorption tower and dehydrated by contacting with the moisture adsorbent (molecular sieve 3A manufactured by Union Showa Co., Ltd.) filled in the moisture adsorption tower.
- the linear velocity LV Linear Velocity
- the space velocity SV Space Velocity
- the water concentration of the hydrogen chloride mixture gas at the outlet of the moisture adsorption tower was 0.34 mol ppm.
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Abstract
Description
[1] 塩化水素と水とを含有する塩化水素混合物であって、少なくとも一部が液体となるように充填容器内に充填されており、気相の水分濃度が0.001モルppm以上4.5モルppm未満である塩化水素混合物。
[2] 塩化水素と水とを含有する塩化水素混合物であって、少なくとも一部が液体となるように充填容器内に充填されており、液相の水分濃度が0.01モルppm以上1モルppm未満である塩化水素混合物。
[3] 前記充填容器への初期充填量G0(単位:kg)に対する前記充填容器の内容積V(単位:L)の比V/G0が1.67以上2.40以下である[1]又は[2]に記載の塩化水素混合物。
水分濃度が1モルppm以上である塩化水素混合物を冷却し、該塩化水素混合物中の水分を凝縮させて分離する第一脱水工程と、
前記第一脱水工程で得られた塩化水素混合物を水分吸着剤に接触させ、水分濃度を0.5モルppm未満とする第二脱水工程と、
前記第二脱水工程で得られた塩化水素混合物を、その少なくとも一部が液体となり且つ充填完了時の液相の水分濃度が0.01モルppm以上1モルppm未満となるように充填容器に充填する充填工程と、
を備える塩化水素混合物の製造方法。
[6] 前記充填工程における前記塩化水素混合物の前記充填容器への充填量G1(単位:kg)に対する前記充填容器の内容積V(単位:L)の比V/G1が1.67以上11.8以下である[4]又は[5]に記載の塩化水素混合物の製造方法。
[8] 塩化水素と水とを含有する塩化水素混合物が充填された充填容器であって、前記塩化水素混合物の少なくとも一部が液体となるように充填されており、液相の水分濃度が0.01モルppm以上1モルppm未満である充填容器。
[10] 容量が1L以上2000L以下である[7]~[9]のいずれか一項に記載の充填容器。
[11] 少なくとも一部分がステンレス鋼で構成されている[7]~[10]のいずれか一項に記載の充填容器。
上記の気相及び液相の水分濃度は、塩化水素混合物を充填容器に充填完了した時から充填容器内の塩化水素混合物のほぼ全量を放出する時点までの間における気相及び液相の水分濃度である。
なお、塩化水素混合物の充填容器への初期充填量G0(単位:kg)に対する充填容器の内容積V(単位:L)の比V/G0は、1.70以上2.13以下がより好ましく、1.74以上1.88以下がさらに好ましい。
なお、充填工程における塩化水素混合物の充填容器への充填量G1(単位:kg)に対する充填容器の内容積V(単位:L)の比V/G1は、1.67以上3.13以下がより好ましく、1.67以上2.40以下がさらに好ましい。
なお、本実施形態は本発明の一例を示したものであって、本発明は本実施形態に限定されるものではない。また、本実施形態には種々の変更又は改良を加えることが可能であり、その様な変更又は改良を加えた形態も本発明に含まれ得る。
〔実施例1〕
塩化水素と水とを含有する塩化水素混合物25kgを、容量47Lの充填容器内に、一部が液体となるように充填した。充填容器内の塩化水素混合物は気相と液相に分かれており、充填完了時の液相の水分濃度は0.80モルppmであった。
長方形状(幅10mm、長さ50mm、厚さ1mm)のSUS316L製テストピースを用意し、質量を測定した後、テフロン(登録商標)製の紐を用いて耐圧容器内に吊るした。この耐圧容器内に上記の水分濃度4.0モルppmの塩化水素混合物ガスを導入し、内圧を0.5MPaGとした。
充填容器への充填完了時の液相の水分濃度が0.40モルppmである点以外は実施例1と同様の操作を行って、水分濃度2.0モルppmの塩化水素混合物ガスを得た。この塩化水素混合物ガスを用いた点以外は実施例1と同様の操作を行って、テストピースの腐食速度を測定したところ、0.81μm/yであった。
充填容器への充填完了時の液相の水分濃度が0.050モルppmである点以外は実施例1と同様の操作を行って、水分濃度0.25モルppmの塩化水素混合物ガスを得た。この塩化水素混合物ガスを用いた点以外は実施例1と同様の操作を行って、テストピースの腐食速度を測定したところ、0.52μm/yであった。
充填容器への充填完了時の液相の水分濃度が0.010モルppmである点以外は実施例1と同様の操作を行って、水分濃度0.050モルppmの塩化水素混合物ガスを得た。この塩化水素混合物ガスを用いた点以外は実施例1と同様の操作を行って、テストピースの腐食速度を測定したところ、0.44μm/yであった。
充填容器への充填完了時の液相の水分濃度が1.0モルppmである点以外は実施例1と同様の操作を行って、水分濃度5.0モルppmの塩化水素混合物ガスを得た。この塩化水素混合物ガスを用いた点以外は実施例1と同様の操作を行って、テストピースの腐食速度を測定したところ、7.4μm/yであった。
充填容器への充填完了時の液相の水分濃度が2.0モルppmである点以外は実施例1と同様の操作を行って、水分濃度10モルppmの塩化水素混合物ガスを得た。この塩化水素混合物ガスを用いた点以外は実施例1と同様の操作を行って、テストピースの腐食速度を測定したところ、54μm/yであった。
次に、水分濃度が1モルppm未満である塩化水素混合物の製造方法の実施例を示す。水分濃度が1000モルppmである粗塩化水素混合物ガスを、320m3/hの流量で冷却凝縮器に送り、-10℃に冷却して粗塩化水素混合物ガス中の水分を凝縮させて、粗塩化水素混合物ガス中の水分の一部を除去した。
この水分濃度0.34モルppmの塩化水素混合物ガス25kgを、ポンプで昇圧しながら容量47Lの充填容器に充填した。充填容器内の液化塩化水素混合物(液相)の水分濃度は0.41モルppmであった。
水分濃度が1000モルppmである粗塩化水素混合物ガスを、320m3/hの流量で冷却凝縮器に送り、-69℃に冷却して粗塩化水素混合物ガス中の水分を凝縮させて、粗塩化水素混合物ガス中の水分の一部を除去した。得られた塩化水素混合物ガスの水分濃度は0.51モルppmであった。
これらの結果から、冷却して水分を凝縮させる工程と水分吸着剤に接触させる工程との二段階の脱水工程を設けることにより、水分濃度1モルppm未満の塩化水素混合物が得られることが分かる。
Claims (11)
- 塩化水素と水とを含有する塩化水素混合物であって、少なくとも一部が液体となるように充填容器内に充填されており、気相の水分濃度が0.001モルppm以上4.5モルppm未満である塩化水素混合物。
- 塩化水素と水とを含有する塩化水素混合物であって、少なくとも一部が液体となるように充填容器内に充填されており、液相の水分濃度が0.01モルppm以上1モルppm未満である塩化水素混合物。
- 前記充填容器への初期充填量G0(単位:kg)に対する前記充填容器の内容積V(単位:L)の比V/G0が1.67以上2.40以下である請求項1又は請求項2に記載の塩化水素混合物。
- 塩化水素と水とを含有する塩化水素混合物を製造する方法であって、
水分濃度が1モルppm以上である塩化水素混合物を冷却し、該塩化水素混合物中の水分を凝縮させて分離する第一脱水工程と、
前記第一脱水工程で得られた塩化水素混合物を水分吸着剤に接触させ、水分濃度を0.5モルppm未満とする第二脱水工程と、
前記第二脱水工程で得られた塩化水素混合物を、その少なくとも一部が液体となり且つ充填完了時の液相の水分濃度が0.01モルppm以上1モルppm未満となるように充填容器に充填する充填工程と、
を備える塩化水素混合物の製造方法。 - 前記充填容器の少なくとも一部分がステンレス鋼で構成されている請求項4に記載の塩化水素混合物の製造方法。
- 前記充填工程における前記塩化水素混合物の前記充填容器への充填量G1(単位:kg)に対する前記充填容器の内容積V(単位:L)の比V/G1が1.67以上11.8以下である請求項4又は請求項5に記載の塩化水素混合物の製造方法。
- 塩化水素と水とを含有する塩化水素混合物が充填された充填容器であって、前記塩化水素混合物の少なくとも一部が液体となるように充填されており、気相の水分濃度が0.001モルppm以上4.5モルppm未満である充填容器。
- 塩化水素と水とを含有する塩化水素混合物が充填された充填容器であって、前記塩化水素混合物の少なくとも一部が液体となるように充填されており、液相の水分濃度が0.01モルppm以上1モルppm未満である充填容器。
- 前記塩化水素混合物の初期充填量G0(単位:kg)に対する内容積V(単位:L)の比V/G0が1.67以上2.40以下である請求項7又は請求項8に記載の充填容器。
- 容量が1L以上2000L以下である請求項7~9のいずれか一項に記載の充填容器。
- 少なくとも一部分がステンレス鋼で構成されている請求項7~請求項10のいずれか一項に記載の充填容器。
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