Device and method for preparing 1,1,1,2-tetrafluoroethane

A technology of tetrafluoroethane and tubular reactors, which is applied to the preparation of halogenated hydrocarbons, halogen substitution preparations, chemical instruments and methods, etc., can solve the problems of complex reactor structure, increased reactor vibration, and large tube vibration. Achieve the effects of improving operational stability and operational flexibility, long operating cycle, and long service life

Inactive Publication Date: 2017-04-19
QUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat transfer effect of this invention is good, but the disadvantage is that the reactor structure is complex, the equipment investment is large, and the impact of the circulating flow of molten salt in the reactor on the tube bundle causes the tubes to vibrate greatly. The turbulence is increased, and the vibration of the reactor is also increased, making it difficult to operate smoothly

Method used

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  • Device and method for preparing 1,1,1,2-tetrafluoroethane

Examples

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Effect test

Embodiment 1

[0023] A device for preparing 1,1,1,2-tetrafluoroethane, including a preheater 1, a vertically installed tubular reactor 2, a molten salt furnace 3 (material is 316L), a buffer tank 4, a water washing tower 5, Alkali washing tower 6, drying tower 7, rectifying tower 8, preheater 1, tubular reactor 2, buffer tank 4, water washing tower 5, alkali washing tower 6, drying tower 7, and rectifying tower 8 are connected in sequence, and the tubular reaction The reactor 2 includes a reactor body 11 (the length-to-diameter ratio is 20:1, the nominal diameter is 35mm, and the material is 316L) and an upper head 9 and a lower head 10 arranged at both ends of the reactor body 11, and the reactor body 11 passes through Molten salt furnace 3.

[0024] When the device is used for the preparation of 1,1,1,2-tetrafluoroethane, the molten salt filled in the molten salt furnace 3 is potassium nitrate and sodium nitrate with a mass ratio of 1:1, and 120ml is filled in the reactor body 11 Fluorin...

Embodiment 2

[0026] A device for preparing 1,1,1,2-tetrafluoroethane, including a preheater 1, a vertically installed tubular reactor 2, a molten salt furnace 3 (made of Monel alloy), a buffer tank 4, and a water washing tower 5. Alkali washing tower 6, drying tower 7, rectifying tower 8, preheater 1, tubular reactor 2, buffer tank 4, water washing tower 5, alkali washing tower 6, drying tower 7, rectifying tower 8 are connected in sequence, The tubular reactor 2 includes a reactor body 11 (a length-to-diameter ratio of 15:1, a nominal diameter of 40mm, and a material of Monel alloy) and an upper head 9 and a lower head 10 arranged at both ends of the reactor body 11. The reactor The body 11 passes through the molten salt furnace 3 .

[0027]When the device is used to prepare 1,1,1,2-tetrafluoroethane, the molten salt filled in the molten salt furnace 3 is potassium nitrate and sodium nitrate with a mass ratio of 1:2, and the reactor body 11 is filled with 120ml Fluorination catalyst (the...

Embodiment 3

[0029] A device for preparing 1,1,1,2-tetrafluoroethane, including a preheater 1, a vertically installed tubular reactor 2, a molten salt furnace 3 (made of stainless steel 316L), a buffer tank 4, and a water washing tower 5 , alkali washing tower 6, drying tower 7, rectifying tower 8, preheater 1, tubular reactor 2, buffer tank 4, water washing tower 5, alkali washing tower 6, drying tower 7, rectifying tower 8 are connected in turn, tubular The reactor 2 includes a reactor body 11 (the ratio of length to diameter is 10:1, the nominal diameter is 45mm, and the material is stainless steel 316L), and the upper head 9 and the lower head 10 arranged at both ends of the reactor body 11, the reactor body 11 Go through the molten salt furnace3.

[0030] When the device is used to prepare 1,1,1,2-tetrafluoroethane, the molten salt filled in the molten salt furnace 3 is potassium nitrate and sodium nitrate with a mass ratio of 2:1, and the reactor body 11 is filled with 120ml Fluorin...

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Abstract

The invention discloses a device for preparing 1,1,1,2-tetrafluoroethane. The device comprises a preheater, a vertically-installed tubular reactor, a vertically-installed molten salt furnace, a buffer tank, a water scrubber, an alkaline tower, a drying tower and a rectifying tower; the preheater, the tubular reactor, the buffer tank, the water scrubber, the alkaline tower, the drying tower and the rectifying tower are sequentially connected, the tubular reactor comprises a reactor body, an upper sealing end and a lower sealing end, the upper sealing end and the lower sealing end are arranged at the two ends of the reactor body, and the reactor body penetrates the molten salt furnace. The invention further discloses a method for preparing the 1,1,1,2-tetrafluoroethane with the device. The device has the beneficial effects of being simple in structure, stable in operation, efficient, economical and long in running period.

Description

technical field [0001] The invention relates to the field of hydrofluorocarbon compounds, in particular to a device and method for preparing 1,1,1,2-tetrafluoroethane. Background technique [0002] 1,1,1,2-tetrafluoroethane (CF 3 CH 2 F, HFC-134a), can be used in automotive air conditioners, home appliances and industrial and commercial refrigeration equipment, and can also be used in industries such as foaming, fire extinguishing, aerosol and cleaning, and is currently a widely used hydrofluorocarbon. Currently, the synthesis of 1,1,1,2-tetrafluoroethane (HFC-134a) is usually based on 1,1,1-trifluoro-2-chloroethane (HCFC-133a) and anhydrous hydrofluoric acid ( AHF) is obtained by fluorine-chlorine exchange reaction. The reactor used is generally a fixed-bed fluorination reactor, and the reaction catalyst is basically Al 2 o 3 or AlF 3 or MgF 2 The Al source and the Mg source are used as the carrier, and the catalyst is loaded with active components such as Cr. At 300°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/20C07C19/08
CPCC07C17/206C07C19/08
Inventor 吕亮王玉林
Owner QUZHOU UNIV
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