WO2009130986A1 - テトラフルオロエチレンの精製方法 - Google Patents
テトラフルオロエチレンの精製方法 Download PDFInfo
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- WO2009130986A1 WO2009130986A1 PCT/JP2009/056979 JP2009056979W WO2009130986A1 WO 2009130986 A1 WO2009130986 A1 WO 2009130986A1 JP 2009056979 W JP2009056979 W JP 2009056979W WO 2009130986 A1 WO2009130986 A1 WO 2009130986A1
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- silica gel
- tetrafluoroethylene
- salt
- tfe
- polymerization inhibitor
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
- C07C17/389—Separation; Purification; Stabilisation; Use of additives by adsorption on solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0225—Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
- B01J20/0229—Compounds of Fe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0281—Sulfates of compounds other than those provided for in B01J20/045
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0288—Halides of compounds other than those provided for in B01J20/046
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0296—Nitrates of compounds other than those provided for in B01J20/04
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
- B01J20/3204—Inorganic carriers, supports or substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3234—Inorganic material layers
- B01J20/3236—Inorganic material layers containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
Definitions
- the present invention relates to a method for purifying tetrafluoroethylene by adsorbing and removing a polymerization inhibitor added to tetrafluoroethylene.
- Tetrafluoroethylene is a very useful compound as a raw material for fluoropolymers such as fluororesins and fluororubbers and fluorine-containing solvents.
- TFE tetrafluoroethylene
- various polymerization inhibitors are added when storing TFE (see Patent Document 1 below).
- the polymerization inhibitor remains in the TFE, the desired polymerization reaction does not proceed and the fluoropolymer cannot be obtained. Therefore, the polymerization inhibitor was removed immediately before use in the polymerization reaction or the like. Later, it is subjected to polymerization.
- an object of the present invention is to provide a new method for adsorbing and removing a polymerization inhibitor from tetrafluoroethylene containing the polymerization inhibitor.
- the present invention provides a method for purifying tetrafluoroethylene having the following constitution.
- Tetrafluoroethylene comprising contacting tetrafluoroethylene containing a polymerization inhibitor with silica gel containing a metal salt in an amount of 250 to 100000 mass ppm in terms of metal atoms, and adsorbing and removing the polymerization inhibitor Purification method.
- the metal salt is a salt of a metal from Group 3 to Group 13 of the periodic table.
- [5] The method for purifying tetrafluoroethylene according to any one of [1] to [4] above, wherein the silica gel is produced by immersing raw silica gel in an aqueous solution in which a metal salt is dissolved.
- [6] The method for purifying tetrafluoroethylene according to any one of [1] to [5] above, wherein the metal salt is an iron salt.
- [7] The method for purifying tetrafluoroethylene according to the above [6], wherein the content of the iron salt in the silica gel is 300 to 10,000 mass ppm in terms of iron atom.
- the method for purifying tetrafluoroethylene of the present invention it is possible to prevent a polymer from being formed inside the silica gel particles when the polymerization inhibitor is adsorbed and removed from the TFE containing the polymerization inhibitor with silica gel. Accordingly, it is possible to suppress the occurrence of a problem that the pores of the silica gel are blocked and the adsorption ability of the polymerization inhibitor of the silica gel is lowered. In addition, it is possible to suppress the occurrence of problems such that the used silica gel is solidified by the polymer and is difficult to be extracted from the packed tower. Furthermore, TFE is not decomposed by the heat of polymerization of TFE.
- the present invention is particularly useful as a TFE purification method in which a polymerization inhibitor is removed from TFE as a raw material immediately before the reaction in a process for industrially producing a fluorine-containing polymer or a fluorine-containing solvent.
- the method for purifying tetrafluoroethylene according to the present invention is characterized in that tetrafluoroethylene containing a polymerization inhibitor is brought into contact with silica gel containing a metal salt to remove the polymerization inhibitor by adsorption.
- tetrafluoroethylene containing a polymerization inhibitor is brought into contact with silica gel containing a metal salt to remove the polymerization inhibitor by adsorption.
- a salt of any metal of Groups 3 to 13 of the periodic table is preferable, and a salt of any metal of Groups 8 to 10 of the periodic table is more preferable.
- Specific examples include salts of at least one metal selected from the group consisting of iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum. Most preferred is an iron salt or a cobalt salt.
- Preferable acids for forming the metal salt include inorganic acids such as sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and carbonic acid. Among them, sulfuric acid or hydrochloric acid is preferable.
- the content of the metal salt in the silica gel is 250 to 100,000 mass ppm, preferably 300 to 10000 mass ppm, more preferably 400 to 5000 ppm by mass in terms of metal atoms.
- the content is 250 ppm by mass or less, the effect of suppressing the polymerization reaction cannot be exhibited.
- the content is 100000 ppm by mass or more, the production cost of silica gel increases or the metal salt affects the adsorption characteristics of the silica gel. Neither is preferred because of the possibility.
- the silica gel containing the metal salt is, for example, a method of adding a metal salt containing a metal atom to a raw material for producing silica gel, or a raw material silica gel synthesized in a particulate form is immersed in an aqueous solution in which the metal salt is dissolved.
- the method is not limited to these methods.
- the method of immersing the raw material silica gel in an aqueous solution in which the metal salt is dissolved and impregnating the silica gel particles with the metal salt is preferable because it is simple.
- the water content of the raw silica gel is preferably 20% by mass to 35% by mass, more preferably 28% by mass to 32% by mass.
- silica gel containing a combination of two or more metal salts may be used.
- the specific surface area of the silica gel in the present invention 100m 2 / g ⁇ 1000m 2 / g , more preferably 300m 2 / g ⁇ 800m 2 / g, 500m 2 / g ⁇ 700m 2 / g being most preferred. If the specific surface area of the silica gel is less than 100 m 2 / g, the amount of the polymerization inhibitor that can be adsorbed per unit mass of the silica gel will decrease, and if the specific surface area of the silica gel is made larger than 1000 m 2 / g, the silica gel production process will be complicated. This increases the manufacturing cost of silica gel. It is preferable that the specific surface area of the silica gel is in the above-mentioned range without the above problem.
- the silica gel in the present invention is preferably used by being packed in an adsorption tower. Moreover, since it is easy to handle when filling the adsorption tower or when extracting from the adsorption tower, it is preferable to be granular.
- the average particle diameter of the silica gel particles is preferably 0.1 mm to 10 mm, more preferably 0.5 mm to 5 mm, and most preferably 1 mm to 4 mm. If the average particle diameter of the silica gel is smaller than 0.1 mm, the pressure loss at the time of contact with TFE containing a polymerization inhibitor increases, and it becomes difficult to increase the purification rate of TFE.
- the average particle diameter of the silica gel is larger than 10 mm, the packing density when the silica gel particles are packed in the adsorption tower is lowered, so that the adsorption efficiency of the polymerization inhibitor is lowered. It is preferable that the average particle diameter of the silica gel is within the above range without the above problem.
- the water content of the silica gel in the present invention is preferably 0.01% by mass to 10% by mass, more preferably 0.1% by mass to 5% by mass, and most preferably 0.2% by mass to 2% by mass. If the water content of the silica gel is to be less than 0.01% by mass, the silica gel drying process, storage, and handling method become complicated. When the water content is higher than 10% by mass, moisture is mixed into the contacted TFE or the adsorption ability of the polymerization inhibitor is lowered. It is preferable that the water content of the silica gel is in the above-mentioned range without the above problem.
- the metal salt is an iron salt.
- the content of the iron salt in the silica gel is preferably 250 to 100,000 ppm by mass, more preferably 300 to 10,000 ppm by mass, and more preferably 400 to 5000 ppm by mass in terms of iron atoms with respect to the mass of the silica gel. Is most preferred.
- the iron atom content in the silica gel is less than 250 ppm by mass, TFE is polymerized inside the silica gel particles to produce a polymer, TFE is decomposed by the polymerization heat of TFE, and the silica gel pores are blocked.
- the adsorption ability of the polymerization inhibitor may be reduced, or the silica gel used may be solidified by the polymer, making extraction difficult.
- a silica gel will contain the iron atom more than necessary, and the manufacturing cost of a silica gel becomes high.
- the adsorption property of the polymerization inhibitor is lowered. If the iron atom content of the silica gel is within the above range, the above problem is not desirable.
- ferrous sulfate, ferric sulfate, ferrous chloride, ferric chloride, ferrous nitrate, ferric nitrate and the like are preferable, and ferrous sulfate or ferric sulfate is preferable. More preferred.
- the silica gel containing a metal salt in the present invention preferably contains a cobalt salt such as cobaltous chloride (CoCl 2 ) in addition to the metal salt such as the iron salt. Since the color of silica gel containing cobalt chloride changes as the moisture content of the silica gel changes, it becomes possible to visually determine the moisture content of the silica gel. For example, when the water content of silica gel is 20% or less, blue is displayed, but when the water content exceeds 40%, red is displayed.
- the content of cobalt chloride is preferably 400 to 50000 mass ppm, more preferably 1000 to 30000 mass ppm, most preferably 2000 to 15000 mass ppm as cobalt atoms.
- the content of cobalt chloride is less than 400 ppm by mass, it is difficult to visually distinguish the color. Moreover, when there is more content of cobalt chloride than 50000 mass ppm, the manufacturing cost of a silica gel becomes high by impregnating more than necessary cobalt chloride. In addition, the adsorption property of the polymerization inhibitor is lowered. It is preferable that the content of cobalt chloride in the silica gel is within the above range because there is no problem. Further, as shown in the examples described later, since the cobalt salt also has an effect of suppressing the polymerization reaction of TFE, an additive and synergistic effect with other metal salts can be expected.
- a method of impregnating the silica gel with cobalt chloride a method of impregnating silica gel particles with cobalt chloride by immersing silica gel containing a metal salt such as iron salt in an aqueous solution of cobalt chloride is preferable. Furthermore, a method of immersing the raw material silica gel synthesized in the form of particles in an aqueous solution containing a metal salt such as an iron salt and cobalt chloride is preferable. The latter method is more preferable because it can be impregnated with other metal salts such as cobalt chloride and iron salt at the same time, and the silica gel can be easily produced.
- terpene compounds such as ⁇ -pinene, ⁇ -pinene, ⁇ -terpinene, ⁇ -terpinene, diterpene, terpinolene, isoterpinolene, camphene, p-cymene and p-menthane are preferable.
- ⁇ -Pinene is more preferred.
- the addition amount of the polymerization inhibitor with respect to TFE is preferably 10 to 1000 ppm by mass, more preferably 20 to 500 ppm by mass. When the addition amount of the polymerization inhibitor in TFE is less than 10 ppm by mass, the polymerization of TFE cannot be sufficiently suppressed, and when it exceeds 1000 ppm by mass, it is difficult to remove.
- the content of the polymerization inhibitor in TFE purified by the TFE purification method of the present invention is preferably less than 1 mass ppm.
- a large amount of a polymerization initiator is required, and the polymerization reaction rate of TFE is slowed, so that the productivity of the polymer is lowered.
- a polymerization inhibitor may be mixed into the polymer product to cause problems such as coloring.
- TFE of the present invention As a purification method of TFE of the present invention, silica gel containing a specific amount of metal salt is packed in an adsorption tower, TFE containing a polymerization inhibitor is introduced into the adsorption tower and brought into contact with silica gel, and the polymerization inhibitor is adsorbed.
- the method of removing is preferable.
- the temperature at which TFE and silica gel are brought into contact with each other in the adsorption tower is preferably -20 ° C to 20 ° C, more preferably 0 ° C to 15 ° C. When the contact temperature is lower than ⁇ 20 ° C., high pressure TFE is liquefied, which is not preferable.
- the flow rate of TFE containing a polymerization inhibitor to the adsorption tower is preferably such that the linear velocity of TFE passing through the tower is 0.005 m / second to 1 m / second, and 0.01 m / second to 0 It is more preferably 0.5 m / sec, and most preferably 0.02 m / sec to 0.1 m / sec.
- the linear velocity of TFE is higher than 0.005 m / sec, the TFE purification rate becomes slow, so the productivity is lowered.
- the linear velocity of TFE is faster than 1 m / sec, it is not preferable because the polymerization inhibitor may not be sufficiently adsorbed.
- silica gel is dissolved in an acidic aqueous solution, and the aqueous solution in which the silica gel is dissolved is analyzed with an inductively coupled plasma emission spectrometer ICP (manufactured by Hitachi, Ltd., P-4000) to measure the concentration of iron atoms and cobalt atoms contained in the aqueous solution. Then, iron atoms and cobalt atoms contained in the silica gel were quantified.
- ICP inductively coupled plasma emission spectrometer
- Measurement was performed by the method described in JIS Z 0701 using JIS standard sieves having an opening of 4.00 mm, 3.35 mm, 2.80 mm, 2.36 mm, 1.70 mm, and 0.85 mm.
- Example 1 While stirring 15 kg of silica gel 1 used in Comparative Example 1 with a mixer, an aqueous solution in which 11.2 g of ferrous sulfate heptahydrate was dissolved in 15 kg of demineralized water had a water content of 7% by mass of silica gel. Until sprayed. Thereafter, the silica gel was immersed in the aqueous ferrous sulfate solution and allowed to stand for 72 hours. Thereafter, the silica gel was pulled up from the aqueous solution using a stainless steel mesh and left on the mesh for 16 hours to separate the aqueous solution from the silica gel. The obtained silica gel was dried in an oven at 150 ° C.
- silica gel 2 containing 540 mass ppm of iron atoms.
- the silica gel 2 was brought into contact with TFE in the same manner as in Comparative Example 1, the silica gel 2 maintained transparency and no TFE polymer was formed.
- Example 2 15 kg of silica gel 1 used in Comparative Example 1 was put into a mixer, and atomized water was sprayed for about 6 hours while stirring, and the silica gel was hydrated until the water content became 30% by mass.
- the silica gel soaked in water was immersed in an aqueous solution in which 9 kg of cobaltous chloride hexahydrate was dissolved in 90 kg of demineralized water, and the silica gel was impregnated with cobalt chloride while stirring. After 72 hours, the silica gel was pulled up from the aqueous solution using a stainless steel mesh, and left on the mesh for 16 hours to separate the aqueous solution from the silica gel.
- silica gel was dried in an oven at 150 ° C. for 6 hours to obtain silica gel 3 containing 3300 mass ppm of cobalt atoms.
- the silica gel 3 was brought into contact with TFE in the same manner as in Comparative Example 1, the transparency of a small part of the particles of the silica gel 3 was decreased, suggesting the formation of a TFE polymer. The result was less than that of Comparative Example 1.
- silica gel was pulled up from the aqueous solution with a stainless steel mesh and left on the mesh for 16 hours to separate the aqueous solution from the silica gel.
- the obtained silica gel was dried in an oven at 150 ° C. for 6 hours to obtain silica gel 4 to 8.
- Table 2 below shows physical properties such as iron atom content of silica gels 4 to 8.
- Example 3 A tube heat exchanger (main body inner diameter: 750 mm, inner tube has an inner diameter of 42 mm, 110 tubes with a length of 1200 mm) filled with 30 kg of silica gel 4 to 8 (150 kg in total), Nitrogen pressurization was repeated three times to replace the inside of the tube heat exchanger with nitrogen. Next, TFE containing 150 ppm by mass of ⁇ -pinene was slowly introduced while flowing 10 ° C. water around the tube filled with silica gel and cooling, and the nitrogen gas in the tube was replaced with TFE.
- TFE containing 150 mass ppm of ⁇ -pinene was pressurized to 1.5 MPaG and contacted with silica gel at a linear velocity of 0.037 m / sec to remove ⁇ -pinene. From the analysis result of purified TFE, ⁇ -pinene was not detected. Thereafter, the state of silica gel was confirmed after treating 38 tons of TFE continuously. As a result, no TFE polymer was formed in any of the silica gels 4 to 8, and the silica gel could be easily sucked and removed from the tube.
- Example 4 TFE was purified in the same manner as in Example 3 except that the silica gel used was changed to silica gel 9-13. During the processing of 38 tons, ⁇ -pinene was not detected in the purified TFE, and it was found that silica gels 9 to 13 were excellent in the purification characteristics of TFE. On the other hand, when the state of the silica gel after use for TFE purification was confirmed, a TFE polymer was formed in any silica gel, and the silica gel could not be easily extracted from the tube, and TFE polymerization was inhibited. It was found that the effect was not sufficient as compared with silica gels 4 to 8 used in Example 3.
- Example 4 the silica gel contains a cobalt salt, so that the TFE produced when ⁇ -pinene is adsorbed and removed by silica gel. The polymerization reaction was suppressed and 38 tons could be processed. However, when 38 tons of TFE was continuously processed, the polymer of TFE accumulated and it was very difficult to extract the silica gel. On the other hand, as shown in Example 3, when the silica gel contains an iron salt and a cobalt salt, a further excellent polymerization inhibitory effect is obtained, and even when 38 tons of TFE is continuously treated, the TFE polymer is obtained. There was no accumulation and no silica gel sticking by the polymer occurred. Therefore, although the cobalt atom and the iron atom were excellent in the polymerization inhibitory effect, it has confirmed that the polymerization inhibitory effect of an iron atom was more excellent.
- Example 5 125 g of silica gel 4 used in Example 3 was filled into a tubular pressure vessel having an inner diameter of 27 mm and a length of 300 mm. Subsequently, the container was immersed in ice water, vacuuming and nitrogen pressurization were repeated three times to remove the air in the container, and then TFE was purged to replace the nitrogen gas in the container with TFE. Thereafter, TFE was slowly introduced until the pressure reached 1.5 MPaG and left for 24 hours. Thereafter, TFE was purged, and the state of the internal silica gel 4 was confirmed. As a result, it was confirmed that there was no change in transparency and appearance, and no TFE polymer was formed.
- Example 6 30 kg of the silica gel 1 used in Comparative Example 1 was put into a mixer, and atomized water was sprayed for about 6 hours while stirring, and the silica gel was hydrated until the water content became 30% by mass. Next, the silica gel soaked in water was immersed in a 90 kg aqueous solution of demineralized water in which 173 g of ferrous sulfate heptahydrate and 9 kg of ferrous cobalt hexahydrate were dissolved, and the silica gel was stirred. Was impregnated with cobalt chloride.
- silica gel 14 was pulled up from the aqueous solution with a stainless steel mesh and allowed to stand on the mesh for 16 hours to separate the aqueous solution from the silica gel to obtain silica gel 14 containing 160 mass ppm of iron atoms and 4700 mass ppm of cobalt atoms. .
- the obtained silica gel 14 was brought into contact with TFE in the same manner as in Example 5. As a result, some of the particles were clouded, and it was confirmed that a TFE polymer was formed inside the silica gel particles.
- the polymerization inhibitor in TFE can be easily removed. Therefore, it is useful as a TFE purification method in which a polymerization inhibitor is adsorbed and removed from TFE immediately before the reaction in the step of producing a fluoropolymer or a fluorine-containing solvent. Further, it is particularly useful as an industrial purification method for removing terpenes which are polymerization inhibitors from not only TFE but also highly reactive fluorine-containing monomers.
Abstract
Description
[1] 重合禁止剤を含有するテトラフルオロエチレンを、金属塩を金属原子換算で250~100000質量ppm含有するシリカゲルと接触させて、重合禁止剤を吸着除去することを特徴とする、テトラフルオロエチレンの精製方法。
[2] 前記金属塩が周期表3~13族金属の塩である、上記[1]に記載のテトラフルオロエチレンの精製方法。
[3] 前記金属塩が周期表8~10族金属の塩である、上記[1]に記載のテトラフルオロエチレンの精製方法。
[4] 前記金属塩が、鉄、コバルト、ニッケル、ルテニウム、ロジウム、パラジウム、オスミウム、イリジウム、及び白金からなる群から選ばれた少なくとも1種の金属の塩である、上記[1]に記載のテトラフルオロエチレンの精製方法。
[5] 前記シリカゲルが、原料シリカゲルを、金属塩が溶解した水溶液に浸漬して製造される、上記[1]~[4]のいずれかに記載のテトラフルオロエチレンの精製方法。
[6] 前記金属塩が鉄塩である、上記[1]~[5]のいずれかに記載のテトラフルオロエチレンの精製方法。
[7] 前記シリカゲル中の鉄塩の含有量が、鉄原子換算で300~10000質量ppmである、上記[6]に記載のテトラフルオロエチレンの精製方法。
[8] 前記シリカゲルが、さらに塩化コバルトをコバルト原子換算で400~50000質量ppm含有する、上記[6]又は[7]に記載のテトラフルオロエチレンの精製方法。
[9] 前記シリカゲルの比表面積が100m2/g~1000m2/gである、上記[1]~[8]のいずれかに記載のテトラフルオロエチレンの精製方法。
[10] 前記シリカゲルの平均粒子径が0.1mm~10mmである、上記[1]~[9]のいずれかに記載のテトラフルオロエチレンの精製方法。
[11] 前記重合禁止剤がテルペン類である、上記[1]~[10]のいずれかに記載のテトラフルオロエチレンの精製方法。
[12] 重合禁止剤を含有するテトラフルオロエチレンと前記シリカゲルとの接触温度が-20℃~20℃である、上記[1]~[11]のいずれかに記載のテトラフルオロエチレンの精製方法。
[13] 重合禁止剤を含有するテトラフルオロエチレンとシリカゲルとの接触時の、テトラフルオロエチレンの線速が0.005m/秒~1m/秒である、上記[1]~[12]のいずれかに記載のテトラフルオロエチレンの精製方法。
本発明は、工業的に含フッ素重合体や含フッ素溶剤を製造する工程において、原料のTFEから反応の直前に重合禁止剤を除去するTFEの精製方法として、特に有用である。
上記金属塩を形成する好ましい酸としては、硫酸、塩酸、硝酸、リン酸、炭酸などの無機酸が挙げられるが、なかでも硫酸、または塩酸が好ましい。
なお、粒状の原料シリカゲルを前記水溶液に浸漬する前に原料シリカゲルに水分を含有させると、浸漬した際に粒状の原料シリカゲルの割れを防ぐことができるので好ましい。前記水溶液に浸漬する前に原料シリカゲルに水分を含有させる場合には、原料シリカゲルの含水率は20質量%~35質量%が好ましく、28質量%~32質量%がより好ましい。
更に、後述する実施例で示すように、コバルト塩にもTFEの重合反応を抑制する効果があるので、他の金属塩との相加的・相乗的効果が期待できる。
シリカゲルを酸性水溶液で溶解し、シリカゲルが溶解した水溶液を誘導結合プラズマ発光分析装置ICP(日立製作所社製、P-4000)で分析し、前記水溶液に含まれる鉄原子及びコバルト原子の濃度を測定し、シリカゲルに含まれる鉄原子及びコバルト原子を定量した。
日本ベル社製のBELSORP28を使用し、窒素ガスを使ってシリカゲルのBET比表面積を測定した。
目開きが4.00mm、3.35mm、2.80mm、2.36mm、1.70mm、および0.85mmのJIS標準篩を使用し、JIS Z 0701に記載の方法で測定した。
JIS Z 0701に記載の方法で測定した。
水素炎イオン化検出器を備えたガスクロマトグラフィーで分析した。
AGCエスアイテック社製シリカゲル1(ヒシパール白、比表面積595m2/g、平均粒子径2.70mm、鉄原子含有量=14ppm、コバルトは不検出)の4.5gを、内径8mm、長さ100mmのチューブ状圧力容器に充填した。続いて容器を氷水に浸漬し、真空引きと窒素加圧を3回繰り返して容器内の空気を除去したのち、TFEをパージして容器内の窒素ガスをTFEに置換した。その後、TFEを圧力が1.5MPaGになるまでゆっくりと導入した後、24時間放置した。その後、TFEをパージし、内部のシリカゲルの状態を確認したところ、無色透明であったシリカゲル1は、全ての粒子が白色不透明になっており、シリカゲル粒子内部でTFEの重合体の生成が示唆された。
比較例1で使用したシリカゲル1の15kgをミキサーで攪拌しながら、脱塩水の15kgに硫酸第一鉄七水和物の11.2gを溶解させた水溶液をシリカゲルの含水率が7質量%になるまで噴霧した。その後、前記硫酸第一鉄水溶液に前記シリカゲルを浸漬し、72時間放置した。その後、シリカゲルをステンレス鋼製メッシュを用いて水溶液から引き上げ、メッシュ上で16時間放置して水溶液とシリカゲルを分離した。得られたシリカゲルを150℃のオーブンで6時間乾燥させ、鉄原子を540質量ppm含有するシリカゲル2を得た。次に、該シリカゲル2を比較例1と同様にしてTFEと接触させたところ、シリカゲル2は透明性を維持し、TFEの重合体は生成しなかった。
比較例1で使用したシリカゲル1の15kgをミキサーに投入し、攪拌しながら霧状の水を約6時間噴霧し、含水率が30質量%になるまでシリカゲルを含水させた。含水させたシリカゲルを、塩化第一コバルト六水和物の9kgを脱塩水の90kgに溶解させた水溶液中に浸漬し、攪拌しながらシリカゲルに塩化コバルトを含浸させた。72時間後にシリカゲルをステンレス鋼製メッシュを用いて水溶液から引き上げ、メッシュ上で16時間放置して水溶液とシリカゲルを分離した。得られたシリカゲルを150℃のオーブンで6時間乾燥させ、コバルト原子を3300質量ppm含有するシリカゲル3を得た。該シリカゲル3を比較例1と同様にしてTFEと接触させたところ、シリカゲル3のごく一部の粒子の透明性が低下し、TFEの重合体の生成を示唆したが、重合体の生成量は比較例1よりも少ない結果であった。
比較例1で使用したシリカゲル1の30kgをミキサーに投入し、攪拌しながら霧状の水を約6時間噴霧し、含水率が30質量%になるまで含水させた。次いで、含水させたシリカゲルを、下記表1に示す量の硫酸第一鉄七水和物と、塩化第一コバルト六水和物の9kgとを溶解させた脱塩水の90kgの水溶液中に浸漬し、攪拌しながらシリカゲルに硫酸鉄と塩化コバルトを含浸させた。72時間後にシリカゲルをステンレス鋼製メッシュで水溶液から引き上げ、メッシュ上で16時間放置して水溶液とシリカゲルを分離した。得られたシリカゲルを150℃のオーブンで6時間乾燥し、シリカゲル4~8を得た。
シリカゲルを浸漬する水溶液に硫酸第一鉄七水和物を添加しない以外は合成例1と同様にして、シリカゲル9~13を合成した。その鉄原子含有量等の物性を、下記表3に示す。
チューブ式熱交換器(本体の内径:750mm、本体内部に内径42mm、長さ1200mmのチューブを110本有する)のチューブ内に、シリカゲル4~8を各30kg(合計150kg)充填し、真空引きと窒素加圧を3回繰り返して、チューブ式熱交換器の内部を窒素置換した。次いで、シリカゲルが充填されたチューブの周囲に10℃の水を流して冷却しながらα―ピネンを150質量ppm含んだTFEをゆっくりと導入し、チューブ内の窒素ガスをTFEで置換した。次に、α―ピネンを150質量ppm含んだTFEを1.5MPaGに昇圧し、線速0.037m/秒でシリカゲルと接触させてα―ピネンを除去した。精製されたTFEの分析結果からは、α―ピネンは検出されなかった。その後、連続して38トン(38ton)のTFEを処理した後にシリカゲルの状態を確認した。その結果は、シリカゲル4~8のいずれについても、TFEの重合体は生成しておらず、容易にシリカゲルを吸引してチューブ内から除去することが可能であった。
使用するシリカゲルをシリカゲル9~13に変更する以外は実施例3と同様にして、TFEの精製を行った。38トンを処理する間、精製されたTFE中にはα―ピネンは検出されず、シリカゲル9~13は、TFEの精製特性に優れることがわかった。一方、TFE精製に使用した後のシリカゲルの状態を確認したところ、いずれのシリカゲルにおいても、TFEの重合体が生成しており、容易にシリカゲルをチューブ内から抜き出すことができず、TFEの重合抑制効果は、実施例3で用いたシリカゲル4~8に比較して充分でないことがわかった。
実施例3に用いたシリカゲル4の125gを、内径27mm、長さ300mmのチューブ状圧力容器に充填した。続いて容器を氷水に浸漬し、真空引きと窒素加圧を3回繰り返して容器内の空気を除去した後、TFEをパージして容器内の窒素ガスをTFEに置換した。その後、TFEを圧力が1.5MPaGになるまでゆっくりと導入し、24時間放置した。その後、TFEをパージし、内部のシリカゲル4の状態を確認したところ、透明性、外観に変化は無く、TFEの重合体が生成しないことを確認した。
比較例1で使用したシリカゲル1の30kgをミキサーに投入し、攪拌しながら霧状の水を約6時間噴霧し、含水率が30質量%になるまでシリカゲルを含水させた。次いで、含水させたシリカゲルを、硫酸第一鉄七水和物の173gと、塩化第一コバルト六水和物の9kgとを溶解させた脱塩水の90kgの水溶液中に浸漬し、攪拌しながらシリカゲルに塩化コバルトを含浸させた。72時間後にシリカゲルをステンレス鋼製メッシュで水溶液から引き上げ、メッシュ上で16時間放置して水溶液とシリカゲルを分離し、鉄原子の160質量ppm、コバルト原子の4700質量ppmを含有するシリカゲル14を得た。得られたシリカゲル14を実施例5と同様にしてTFEと接触させた結果、一部の粒子が白濁しており、シリカゲル粒子内部にTFEの重合体が生成したことが確認された。
なお、2008年4月25日に出願された日本特許出願2008-115823号の明細書、特許請求の範囲、及び要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (13)
- 重合禁止剤を含有するテトラフルオロエチレンを、金属塩を金属原子換算で250~100000質量ppm含有するシリカゲルと接触させて、重合禁止剤を吸着除去することを特徴とする、テトラフルオロエチレンの精製方法。
- 前記金属塩が周期表3~13族金属の塩である、請求項1に記載のテトラフルオロエチレンの精製方法。
- 前記金属塩が周期表8~10族金属の塩である、請求項1に記載のテトラフルオロエチレンの精製方法。
- 前記金属塩が、鉄、コバルト、ニッケル、ルテニウム、ロジウム、パラジウム、オスミウム、イリジウム、及び白金からなる群から選ばれた少なくとも1種の金属の塩である、請求項1に記載のテトラフルオロエチレンの精製方法。
- 前記シリカゲルが、原料シリカゲルを、金属塩が溶解した水溶液に浸漬して製造される、請求項1~4のいずれかに記載のテトラフルオロエチレンの精製方法。
- 前記金属塩が鉄塩である、請求項1~5のいずれかに記載のテトラフルオロエチレンの精製方法。
- 前記シリカゲル中の鉄塩の含有量が、鉄原子換算で300~10000質量ppmである、請求項6に記載のテトラフルオロエチレンの精製方法。
- 前記シリカゲルが、さらに塩化コバルトをコバルト原子換算で400~50000質量ppm含有する、請求項6又は7に記載のテトラフルオロエチレンの精製方法。
- 前記シリカゲルの比表面積が100m2/g~1000m2/gである、請求項1~8のいずれかに記載のテトラフルオロエチレンの精製方法。
- 前記シリカゲルの平均粒子径が0.1mm~10mmである、請求項1~9のいずれかに記載のテトラフルオロエチレンの精製方法。
- 前記重合禁止剤がテルペン類である、請求項1~10のいずれかに記載のテトラフルオロエチレンの精製方法。
- 重合禁止剤を含有するテトラフルオロエチレンと前記シリカゲルとの接触温度が-20℃~20℃である、請求項1~11のいずれかに記載のテトラフルオロエチレンの精製方法。
- 重合禁止剤を含有するテトラフルオロエチレンとシリカゲルとの接触時の、テトラフルオロエチレンの線速が0.005m/秒~1m/秒である、請求項1~12のいずれかに記載のテトラフルオロエチレンの精製方法。
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EP09736009.3A EP2269969B1 (en) | 2008-04-25 | 2009-04-03 | Method for purifying tetrafluoroethylene |
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WO2015008695A1 (ja) * | 2013-07-16 | 2015-01-22 | 旭硝子株式会社 | トリフルオロエチレンの保存方法およびトリフルオロエチレンの保存容器 |
JPWO2013161724A1 (ja) * | 2012-04-27 | 2015-12-24 | 旭硝子株式会社 | テトラフルオロプロペンの保存方法およびテトラフルオロプロペンの保存容器 |
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EP3112397A1 (en) * | 2011-07-05 | 2017-01-04 | Asahi Glass Company, Limited | Treatment method for fluororesin pellets |
CN106220471A (zh) * | 2016-08-09 | 2016-12-14 | 天津市振津石油天然气工程有限公司 | 从热解气中提纯四氟乙烯的方法 |
WO2020113200A1 (en) * | 2018-12-01 | 2020-06-04 | Innovamake, Inc. | System and method for three-dimensional production |
WO2023229963A1 (en) * | 2022-05-23 | 2023-11-30 | The Chemours Company Fc, Llc | High purity fluoroolefin compositions and methods of impurity removal |
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US20110034740A1 (en) | 2011-02-10 |
JPWO2009130986A1 (ja) | 2011-08-18 |
CN102015594A (zh) | 2011-04-13 |
CN102015594B (zh) | 2014-10-22 |
EP2269969A1 (en) | 2011-01-05 |
JP5531952B2 (ja) | 2014-06-25 |
EP2269969B1 (en) | 2016-10-12 |
RU2010147916A (ru) | 2012-05-27 |
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US8247626B2 (en) | 2012-08-21 |
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