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Method to purify and stabilize chloroolefins

A technology of chloroalkenes and tetrachloropropene, which is applied in the field of stable compositions of chloroalkenes, and can solve problems such as the difficulty of processing on a commercial scale

Inactive Publication Date: 2012-08-15
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These inhibitors are solid materials, making processing on a commercial scale impractical

Method used

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  • Method to purify and stabilize chloroolefins
  • Method to purify and stabilize chloroolefins
  • Method to purify and stabilize chloroolefins

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1 Batch purification of 1230xa using activated alumina

[0026] Chloroolefin 1230xa (120 g, 14 ppm phosgene) can be mixed with 50 g of various commercially available dried activated aluminas such as La Roche A201, A204 and BASF AL-4126E / 16, and The analysis was performed after approximately one and a half hours at room temperature. Analysis of phosgene can be performed spectrophotometrically using 4-(p-nitrobenzyl)-pyridine. It is often expected to show that the level of phosgene is reduced to less than about 1 ppm.

example 2

[0027] Example 2 Continuous uptake of phosgene from 1230xa using alumina

[0028] Chloroolefin 1230xa, containing about 14 ppm phosgene, can be fed through a fixed bed of about 85 grams of LaRoche 204 or BASF AL-4126E / 16 at room temperature at a rate of 20 ml / min. The contact time will be about 5.3 minutes. It is often expected that the phosgene level per alumina tested is less than about 4 ppm.

example 3

[0029] The effect of example 3 contact time on phosgene absorption

[0030]Example 2 using La Roche 204 alumina can be repeated using about 8 grams of activated alumina and a contact time of about 53 minutes. The phosgene level is often expected to be reduced to about 4 ppm. At a contact time of about 26 minutes, the phosgene level is often expected to be reduced to about 1 ppm.

[0031] The test of example 41230xa chemical stability

[0032] Alumina-treated 1230xa from Example 2 (containing about 5% by weight α-methylstyrene) was subjected to UV irradiation in the presence of air for about five hours, simulating about one year of aging at ambient temperature. It is often expected that the analysis will show no formation of phosgene. If untreated 1230xa was irradiated under similar conditions than before, formation of about 20 ppm phosgene would often be expected.

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Abstract

The present invention is directed towards a method of purification of chloroolefins having 3 carbons and to a method to provide stable compositions of chloroolefins having 3 carbons. The chloroolefins are purified via the use of a solid adsorbents for the removal of decomposition product such as phosgene and / or phosgene precursory from the reaction of the chloroolefins with oxygen. The chloroolefins stabilized against an increase of the phosgene level via the addition of inhibitors to the chloroolefins.

Description

field of invention [0001] The present invention is directed to a method of purifying chloroalkenes having 3 carbons and to a method providing a stable composition of chloroalkenes having 3 carbons. Background of the invention [0002] The Montreal Protocol for the protection of the ozone layer mandates the phase-out of the use of chlorofluorocarbons (CFCs). More "friendly" materials to the ozone layer, such as hydrofluorocarbons (HFCs) such as 134a, replaced chlorofluorocarbons. The latter compounds have been shown to be greenhouse gases, causing global warming and are subject to the Kyoto Protocol on climate change. There is therefore a need for materials that are environmentally acceptable, ie have negligible ozone depletion potential (ODP) and acceptably low global warming potential (GWP). Materials useful as low GWP blowing agents for thermoset and thermoplastic foams, solvents, heat transfer fluids (as in heat pumps), and refrigerants include, but are not limited to: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/04
CPCC07C17/389C07C17/42C07C21/04C07C19/01
Inventor M·Y·艾尔希科P·波内特
Owner ARKEMA FRANCE SA
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