Process for the production of hydrolytically resistant fluorocarbons

Abstract

Abstract A PROCESS FOR THE TREATMENT OF FLUORINATED ALIPHATIC AND AROMATIC HYDROCARBONS, SO AS TO PRODUCE HYDROLYTICALLY RESISTANT FLUOROCARBONS WHICH ARE COLOR AND THERMALLY STABLE. THE PRODUCTION OF HYDROLYTICALLY RESISTANT FLUOROCARBONS INVOLVES THE ELIMINATION OF EASILY HYDROLYZABLE GROUPS-FLUORINE ATOMS OF CF3 GROUPS ATTACHED TO TERTIARY CARBON ATOMS. BY TREATING FLUORINATED ALIPHATIC AND AROMATIC MATERIALS WITH A BASIC SOLUTION, PREFERABLY AT A TEMPERATURE ABOVE 50*C., THESE HYDROLYZABLE GROUPS ARE REPLACED BY HYDROXYL GROUPS. AFTER WASHING WITH WATER, THE HYDROLYZED MATERIALS ARE THEN PLACED IN A REACTION CHAMBER AND REFLUORINATED TO PRODUCE FLUOROCARBONS WITHOUT ANY HYDROXYL GROUPS OR ANY EASILY HYDROLYZABLE SITES. IN THE REFLUORINATION OF THE HYDROLYZED MATERIALS, FLUORINE GAS OR AN INORGANIC FLUORIDE GAS IS INTRODUCED INTO THE ATMOSPHERE SURROUNDING THE HYDROLYZED MATERIALS AT A SLOW RATE SUCH THAT THE INITIAL CONCENTRATION OF THE FLUORINATING GAS IS A MERE TRACE AND SUCH CONCENTRATION IS LESS THAN 6% AT THE END OF 30 MINUTES OF FLUORINATION. THE INTRODUCTION OF THE FLUORINATING GAS IS THEN CONTINUED AT A SLOW RTE TO GRADUALLY INCREASE THE CONCENTRATION THEREOF IN SAID ATMOSPHERE UNTIL THE CONCENTRATION OF THE FLUORINATING GAS IS ABOUT 100%. THE FLUORINATION PROCESS IS PREFERABLY CONDUCTED AT ATMOSPHERIC PRESSURE AND ROOM TEMPERATURE; HOWEVER, HIGHER TEMPERATURES UP TO THE DECOMPOSITION TEMPERATURE OF THE MATERIAL MAY BE USED. ALIPHATIC AND AROMATIC COMPOUNDS MAY ALSO BE INITALLY FLUORINATED BY THE DIRECT ACTION OF A FLUORINATING GAS AS OUTLINED ABOVE, AND THEN TREATED WITH A BASIC SOLUTION AND REFLUORINATED TO ELIMINATE EASILY HYDROLYZABLE GROUPS.

Inventors

• 👤 J Margrave
• 👤 R Lagow

Bibliographic Details