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A method for pipelined and continuous production of fluorinated alkanes by liquid phase method

A fluorinated alkane, pipeline technology, applied in chemical instruments and methods, organic chemistry, halogenated hydrocarbon preparation, etc., can solve problems such as aggravated corrosion, corroded reactors, environmental impact economic losses, etc. The effect of mass transfer and reduction of energy consumption for separation

Active Publication Date: 2021-02-26
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing process for preparing fluorinated alkanes in liquid phase usually adopts tank-type liquid phase fluorination method, but there is a problem of serious corrosion of the reactor
Due to the complex structure of the kettle, some special corrosion-resistant materials such as Hastelloy, duplex stainless steel and other materials are not suitable for processing and applying to the kettle reactor, so the corrosion problem still exists in the actual production, which brings safety hazards to the production , but also cause greater environmental impact and economic loss
In addition, the tank reactor is a fully mixed flow, and the reaction conditions are the same everywhere, which is not suitable for segmental control, and the corrosion rate depends on the reaction conditions, which intensifies the corrosion in the tank.

Method used

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  • A method for pipelined and continuous production of fluorinated alkanes by liquid phase method
  • A method for pipelined and continuous production of fluorinated alkanes by liquid phase method
  • A method for pipelined and continuous production of fluorinated alkanes by liquid phase method

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preparation example

[0034] A method for pipelined and continuous production of fluorinated alkanes by a liquid phase method, characterized in that,

[0035] The fluorinated alkanes have the general formula:

[0036] C n h 2n+2-x-y Cl x f y

[0037] Wherein, n is an integer of 1 to 3,

[0038] The method comprises the steps of:

[0039] (1) The raw material is pumped in from the inlet of the pipelined reactor, and the pipelined reactor includes a heating segment group and a cooling segment group, and the heating segment group includes at least 2 heating segments, and the cooling segment group is placed in the The tail end of the pipeline reactor, the raw material includes chlorinated alkanes, hydrogen fluoride, and fluorination catalyst, and the raw materials are mixed into a reaction liquid in the pipeline reactor, so that in the presence of the fluorination catalyst, the chlorinated alkanes and Hydrogen fluoride is contacted in the pipelined reactor to effect a fluorination reaction resul...

Embodiment 1

[0050] In Example 1, it is a method for pipelined and continuous production of fluorinated alkanes by liquid-phase method, specifically a method for pipelined and continuous production of difluorochloromethane by liquid-phase method. Others are not listed in Example 1. For related technical features, refer to the preparation example.

[0051] A method for the continuous production of fluorinated alkanes in a liquid-phase pipeline, wherein the fluorinated alkanes have the following general formula:

[0052] C n h 2n+2-x-y Cl x f y , wherein, n is an integer of 1 to 3, specifically the preparation of difluorochloromethane.

[0053] The method comprises the steps of:

[0054] (1) The raw material is pumped in from the inlet of the pipelined reactor, and the pipelined reactor includes a heating segment group and a cooling segment group, and the heating segment group includes at least 2 heating segments, and the cooling segment group is placed in the The tail end of the pipel...

Embodiment 2

[0065] In Example 2, it is a method for pipelined and continuous production of fluorinated alkanes by liquid phase method, specifically a method for pipelined and continuous production of difluoromethane by liquid phase method, and other related technologies are not listed in Example 1 Features, refer to the preparation example. The difference between Example 2 and Example 1 is that the fluorinated alkane prepared in Example 2 is difluoromethane, and in the pipelined reactor of Example 2, except for the first section of the heating section group, the rest of the pipelined reaction The heating section group of the reactor adds hydrogen fluoride to the reactor at the front end.

[0066] A method for the continuous production of fluorinated alkanes in a liquid-phase pipeline, wherein the fluorinated alkanes have the following general formula:

[0067] C n h 2n+2-x-y Cl x f y , wherein, n is an integer of 1 to 3, specifically the preparation of difluoromethane.

[0068] (1) ...

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Abstract

The invention discloses a method for continuous production of fluorinated alkanes by a liquid-phase method, which comprises the following steps: (1) pumping raw materials from the inlet of a pipelined reactor so that in the presence of a fluorination catalyst, the chlorinated alkanes and Hydrogen fluoride is contacted in the pipelined reactor to effect a fluorination reaction resulting in a reaction liquid stream comprising fluorinated alkanes and intermediates; the chlorinated alkanes have the general formula C n h 2n+2‑x Cl x , wherein, n is an integer of 1 to 3; (2) separating the fluorinated alkanes from the reaction liquid flow in step (1), and after forming the fluorinated alkane product flow, the remaining reaction liquid flow continues in the pipeline The fluorination reaction is carried out in the fluorination reactor, or it is recycled to step (1). The present invention provides a pipelined and continuous production method of fluorinated alkanes by a liquid phase method, so that the production of fluorinated alkanes has the characteristics of small online reaction volume, small safety hazard, easy control of reaction, continuous production and low production cost.

Description

technical field [0001] The invention relates to a pipelined continuous production method of fluorinated alkanes by a liquid phase method. Background technique [0002] Fluorinated alkanes have the general formula: C n h 2n+2-x-y Cl x f y , wherein, n is an integer ranging from 1 to 3, and fluorinated alkanes have many different applications, including being used as chemical intermediates, blowing agents and refrigerants. [0003] The ever-increasing demand for environmentally-friendly fluorocarbons for use as refrigerants, blowing agents and solvents constantly stimulates the search for economically attractive solutions to their production. The fluorinated alkanes produced by the process of the present invention may themselves be used as refrigerants, blowing agents or solvents, or as intermediates in the production of other haloalkanes which meet the same needs. [0004] The existing process for preparing fluorinated alkanes in liquid phase usually adopts the tank type...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/20C07C19/08C07C19/10B01J8/06
CPCB01J8/067C07C17/206C07C19/08C07C19/10
Inventor 钱超赵恒军葛新陈新志童绍丰钟超
Owner ZHEJIANG UNIV