- Method for gas phase catalytic synthesis of 3,4,4-trifluorocyclobutene
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The invention relates to a method for gas phase catalytic synthesis of 3,4,4-trifluorocyclobutene, and belongs to the field of organic chemical synthesis. According to the method, hexachlorobutadiene(the molecular formula is CCl2=CCl-CCl=CCl2), chlorine (the molecular formula is Cl2) and anhydrous hydrogen fluoride (the molecular formula is HF) generate 1,2,3-trichloro-3,4,4-trifluorocyclobutene(the molecular formula is Cyclo-CF2-CFCl-CCl=CCl-) in a gas phase manner under the action of a cyclofluorination catalyst; and under the action of a hydrodechlorination catalyst, the 1,2,3-trichloro-3,4,4-trifluorocyclobutene and hydrogen generate 3,4,4-trifluorocyclobutene (the molecular formula is Cyclo-CF2-CFH-CH=CH-) in a gas phase manner. According to the invention, the method has characteristics of cheap and easily-available raw materials, simple separation and purification of product and less industrial three-waste, and is suitable for industrial production.
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Paragraph 0022; 0026-0031; 0037-0042
(2020/04/29)
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- Preparation method of 1,1,1,2,4,4,4-heptafluoro-2-butene
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The invention discloses a preparation method of 1,1,1,2,4,4,4-heptafluoro-2-butene. The method uses hexachlorobutadiene and hydrogen fluoride as raw materials and uses a chromium-based catalyst as a fluorine-chlorine exchange catalyst to form the 1,1,1,2,4,4,4-heptafluoro-2-butene under gas phase conditions through a plurality of gas-phase catalytic reactions. Compared with the prior art, the preparation method of the 1,1,1,2,4,4,4-heptafluoro-2-butene provided by the invention has the following advantages: 1, the gas phase fluorination method adopted in the method is a cycle fluorination method, has less three industrial wastes (waste water, waste gases and solid waste), and greatly reduces the production costs; 2, the method can realize rapid and multiple-cycle fluorination, improve a product yield, and have simple separation and purification of the product; and 3, the method has the advantages of cheap raw materials, convenient sources and simple operation, and is suitable for industrialized production.
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Paragraph 0027; 0028; 0229; 0030; 0031; 0036; 0041
(2019/01/07)
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- Method for synthesizing fluorochloro succinic acid
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The invention relates to a method for synthesizing fluorochloro succinic acid, and belongs to the field of organic chemical synthesis. The method for synthesizing fluorochloro succinic acid is characterized in that hexachlorobutadiene (the molecular formula is as follow: CCl2 being equal to CCl-CCl being equal to CCl2) generates fluorochloro cyclobutene (the molecular formula is as follow: Cyclo-C2FxCly-CCl being equal to CCl-, wherein the sum of the x and y is 4) under the effect of cyclo-fluorinated catalysts; then, the fluorochloro succinic acid (the molecular formula is HOOC-C2FxCly-COOH)is generated under the effect of oxidizing agents. CCl2 is equal to CCl-CCl being equal to CCl2 arrow Cyclo-C2FxCly-CCl being equal to CCl- arrow HOOC-C2FxCly-COOH. The method has the advantages thatthe raw materials are cheap; the resources can be conveniently obtained; the product separation and purification are simple; the industrial production is easy; three industrial wastes (waste water, waste solid and waste water) are few.
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Paragraph 0022-0027
(2018/04/03)
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- Catalytic Gas-phase Fluorination of Hexachlorobutadiene to 1,2-Dichlorotetrafluorocyclobutene over Cr/Zn-based Catalysts
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In this paper, the gas-phase fluorination of hexachlorobutadiene (HCBD) to synthesize 1,2-dichlorotetrafluorocyclobutene (DTB) was carried out over a series of Cr/M/Zn catalysts (M = Ni, Co, Cu, In, Al). The influence of prefluorination by different fluorinating agents (HF, 95%HF + 5%Cl2, 95%HF + 5%O2, CF2O, CF2Cl2) on catalytic performance of Cr/Co/Zn sample was also investigated. The addition of prompters to the Cr/Zn catalyst improved remarkably its catalytic properties. The Cr/Ni/Zn catalyst exhibited the best catalytic activity (1.318 mmol/h/g) at 390 °C and the Cr/Co/Zn catalyst showed the best DTB selectivity (42.5%) at 350 °C. Compared to that of gaseous HF, the catalytic performance of the Cr/Co/Zn catalyst after treatment by HF + O2 and CF2O increased considerably, whereas for HF + Cl2 and CF2Cl2 it showed little effect. In order to identify the different species (Cr─O, Cr─F, CrOxFy) present on catalysts’ surface and determine their exact role, these catalysts before and after the reaction were characterized by X-ray photoelectron spectroscopy. It was found that the concentration of the various species was responsible for the activity and lifetime of catalysts. Moreover, a possible reaction route is proposed based upon the product distribution. The most feasible formation pathway of DTB proceeded via the cyclization of C4Cl4F2 or C4Cl3F3 to yield c-C4Cl4F2 and c-C4Cl3F3 followed by further the Cl/F exchange.
- He, Jinwei,Zhang, Mengxue,Zhou, Biao,Zhou, Xiaomeng
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p. 760 - 770
(2018/02/28)
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- Hexafluoropropylene-2-butyne synthesizing method
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The invention discloses a hexafluoropropylene-2-butyne synthesizing method. Hexachlorobutadiene (CCl2=CCl-CCl=CCl2) is taken as the raw material to generate hexafluoropropylene-2-butyne under the action of a catalyst, the raw material hexachlorobutadiene is easy to obtain and low in cost. The gaseous-phase circulating fluorination method is adopted, the discharge level of three industrial wastes is low, the yield of products is high, and production cost is reduced greatly; the gaseous-phase circulating fluorination method is conducted at normal temperature, the traditional high-pressure telomerization process route is avoided, and risks in industrial safety production are reduced greatly; meanwhile, the method has the advantage that operation is easy and is totally suitable for industrial production.
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Paragraph 0025; 0026; 0027; 0028
(2016/10/08)
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