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Process for the synthesis of trifluoroethylene

Inactive Publication Date: 2013-05-23
SOLVAY SOLEXIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a process for preparing trifluoroethylene by hydrodechlorination of chlorotrifluoroethylene using a supported platinum or palladium catalyst on activated carbon. The process provides a high conversion of chlorotrifluoroethylene with low selectivity towards the formation of trifluoroethylene. The use of extruded activated carbon as the support material for the catalyst increases productivity and allows for a high dilution of the reactant. The process can be carried out at low concentrations of the noble metal on the support and with high dilution of the reactant. The invention also provides a process for preparing the catalyst and a method for carrying out the hydrodechlorination reaction. The technical effects of the invention include improved productivity and selectivity towards trifluoroethylene, as well as increased safety and control over the reaction process.

Problems solved by technology

The reaction however proceeds with both low conversion of chlorotrifluoroethylene and low yield in trifluoroethylene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033]Following the general catalyst preparation procedure described above two catalyst were prepared using the extruded activated carbon NORIT® 3X EXTRA as the support and having different concentrations of palladium, as shown in Table 1.

TABLE 1CatalystPd (% wt)A1.14B0.51

[0034]2.0 g of each catalyst was loaded into the reactor and tested according to the general procedure described above. The molar ratio H2 / chlorotrifluoroethylene was 1:1 and the temperature was set at 200° C. The reaction was carried out in the presence of nitrogen, the final concentration of chlorotrifluoroethylene in the gaseous stream for each run is reported in Table 2. The effluent gas from the reactor was analysed to determine the conversion of chlorotrifluoroethylene (CTFE) and the selectivity in trifluoroethylene (TrFE). The results reported in Table 2 below, show that the process proceeds with very high CTFE conversion rates and with high selectivity in TrFE. Furthermore, reducing the concentration of CTF...

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Abstract

A catalytic process for the synthesis of trifluoroethylene from chlorotrifluoroethylene which comprises contacting chlorotrifluoroethylene with hydrogen in the presence of a catalyst consisting of palladium or platinum supported on extruded activated carbon.

Description

[0001]This application claims priority to European application No. 10168130.2 filed on Jul. 1, 2010, the whole content of this application being incorporated herein by reference for all purposes.TECHNICAL FIELD[0002]The present invention relates to a catalytic process for the synthesis of trifluoroethylene. In particular the invention relates to a process for the synthesis of trifluoroethylene by reaction of chlorotrifluoroethylene with hydrogen in the presence of a heterogeneous catalyst.BACKGROUND ART[0003]The hydrodechlorination of chlorotrifluoroethylene to yield trifluoroethylene has been previously described.[0004]Mention can be made of U.S. Pat. No. 2,802,887 (ALLIED CHEMICAL) 13.08.1957 which discloses the gas-phase reaction of chlorotrifluoroethylene with hydrogen to produce trifluoroethylene in the presence of a catalyst comprising palladium supported on activated carbon. The reaction however proceeds with both low conversion of chlorotrifluoroethylene and low yield in tri...

Claims

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Application Information

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IPC IPC(8): C07C17/23
CPCB01J21/18B01J23/42B01J23/44B01J37/0009C07C17/23B01J37/18C07C21/18B01J35/40B01J35/617B01J35/618
Inventor MILLEFANTI, STEFANOTORTELLI, VITOMARCHIONNI, GIUSEPPE
Owner SOLVAY SOLEXIS
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