- Equipment for directly producing bis-o-xylylene hexafluoroacetone through HFPO
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The utility model provides equipment for directly producing bis-o-xylylene hexafluoroacetone through HFPO, which comprises an isomerization kettle, a gas-liquid separation kettle, a rectification column, a condenser, an HFA storage tank and a condensation kettle, the bottom of the isomerization kettle is connected to the bottom of the gas-liquid separation kettle, and the upper part of the gas-liquid separation kettle is connected with the upper part of the isomerization kettle; wherein the top of the gas-liquid separation kettle is connected to the bottom of the rectification column through apipeline, the upper end of the rectification column is respectively connected to an HFPO feed port and an HFA storage tank of the isomerization kettle, and a condenser is also arranged on a connecting pipeline between the rectification column and the HFA storage tank; and the HFA storage tank is connected to the condensation kettle. According to the device, synchronous HFA production and consumption can be realized, risks caused by HFA transportation and storage are avoided, and meanwhile, the reaction catalyst can be directly recycled through the device, so that the cost is saved, and the harm to the environment is avoided.
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Paragraph 0043-0046
(2021/02/13)
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- Preparation method of 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride
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The invention discloses a preparation method of 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride. The method comprises the following steps of (a) accurately weighing N-alkyl phthalimide and a catalyst, stirring and raising the temperature to 90-110 DEG C, and dissolving; slowly dropwise adding hexafluoroacetone hydrate, raising the temperature to 100 to 130 DEG C, reacting for 22 to 80 hourswhile stirring, and discharging to obtain 4, 4-(hexafluoroisopropyl) bis (N-alkyl phthalimide); (b) adding alkali to hydrolyze, and acidifying to obtain hexafluorotetracid; and (c) dehydrating to obtain the 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride. According to the preparation method, the hexafluoroacetone and specific N-alkyl phthalimide directly react under the action of a specific catalyst to prepare hexafluorodianhydride, the step of oxidizing methyl in a traditional method is omitted, the use of metal oxides is avoided, the environmental pollution is small, a normal-pressure reaction is adopted, a high-pressure reaction is not needed, the reaction risk is reduced, the purity of the prepared 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride is high, and the yield reaches 87% or above.
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Paragraph 0022
(2020/04/17)
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- Preparation method of 2,2-bis(3,4-dimethylphenyl) hexafluoropropane
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The invention discloses a synthesis technology for taking sulfoacid as a catalyst to prepare 2,2-bis(3,4-dimethylphenyl) hexafluoropropane. The synthesis technology comprises the following operation steps that (1) ortho-xylene, sulfoacid and a solvent are mixed at the proportion, and a mixture is obtained; (2) hexafluoroacetone gas is injected into the mixture obtained in the step (1), a crude product is obtained at a reaction temperature and reaction pressure, the crude product is subjected to alkali washing, water washing and concentration, and then crystallization through the crystallization solvent, and vacuum drying, and 2,2-bis(3,4-dimethylphenyl) hexafluoropropane is obtained. The synthesis technology is novel, the condition is mild, and the obtained battery-level 2,2-bis(3,4-dimethylphenyl) hexafluoropropane has the high purity.
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Paragraph 0052-0054
(2018/09/08)
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- Preparation method of 2,2-bis(3,4-dimethylphenyl)hexafluoropropane
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The invention discloses a method used for preparing 2,2-bis(3,4-dimethylphenyl)hexafluoropropane. According to the method, 2,2-bis(3,4-dimethylphenyl)hexafluoropropane is obtained via liquid phase reaction of o-xylene with hexafluoroacetone monohydrate under the action of hydrogen fluoride. The raw materials of the method are low in toxicity; reaction pressure is low; operation is convenient; reaction selectivity and yield are high; and the method is suitable for industrialized production. 2,2-bis(3,4-dimethylphenyl)hexafluoropropane prepared via the method can be taken as an intermediate to synthesize fluorine-containing polyimide.
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Paragraph 0023; 0024; 0025; 0026; 0027; 0028-0038
(2017/07/21)
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- Diaryl hexafluoroacetore the synthetic method of the compound of
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The invention provides of a synthesis method of a diaryl hexafluoropropane compound. The method is characterized by comprising the following steps: firstly mixing aromatic hydrocarbon and anhydrous hydrogen fluoride in a reactor, adding a catalyst, and then adding hexafluoropropylene oxide, stirring and heating; removing hydrogen fluoride after the reaction is finished, and refining the rest product to obtain a diaryl hexafluoropropane compound product, wherein the catalyst is one or more of halogenated antimony and halogenated titanium system catalyst. Through the adoption of the method disclosed by the invention, isomerization and condensation reaction with the aromatic hydrocarbon of hexafluoropropylene oxide are realized in a process stage, the process step of the synthesis is reduced, the production cost and the byproduct production are reduced, and the yield of the product is greatly improved.
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Paragraph 0031-0032
(2017/02/09)
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- A new synthetic route of 4,4′-hexafluoroisopropylidene-2, 2-bis-(phthalic acid anhydride) and characterization of 4,4′-hexafluoroisopropylidene-2,2-bis-(phthalic acid anhydride)-containing polyimides
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The title product 4,4′-hexafluoroisopropylidene-2,2-bis-(phthalic acid anhydride) was prepared from hexafluoroacetone and o-xylene as the starting materials by condensation, oxidation and dehydration three-step reaction sequence. It reacted with diamines in DMF or xylene to give polyimides by condensation polymerization. Thermal and viscosity analyses show that these polyimides have lower molecular weight but excellent thermal stability.
- Zhu, Shi-Zheng,Zhao, Jing-Wei,Zhang, Yun-Xiang
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p. 221 - 225
(2007/10/03)
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