Purification of vinyl chloride and a process relating thereto

Claim 1

A PROCESS FOR THE PURIFICATION OF VINYL CHLORIDE OBTAINED FROM ACETYLENE AND HYDROGEN CHLORIDE, BY PRESSURE DISTILLATION, WHICH COMPRISES COMPRESSING IN THE ABSENCE OF LUBRICATING OIL A CRUDE PRE-DRIED GASEOUS VINYL CHLORIDE CONTAMINATED BY INERT GASES, ACETYLENE AND HIGHER CHLORINATED C2-DERIVATIVES TO A PRESSURE OF ABOUT 3 TO 10 ATMOSPHERES, DISSIPATING THE COMPRESSION HEAT EVOLVED TO AN EXTENT SUCH THAT NO CONDENSATION OCCURS, THEN INTRODUCING THE GASEOUS VINYL CHLORIDE HAVING A TEMPERATURE BETWEEN ABOUT 15 TO 90* C. UNDER SUBSTANTIALLY THE SAME PRESSURE INTO A FIRST DISTILLATION COLUMN, SEPARATING THE LOW BOILING CONTAMINATIONS IN SAID DISTILLATION COLUMN BY ALLOWING SAID CONTAMINATIONS TO ESCAPE AT THE TOP OF THE COLUMN UNDER SUBSTANTIALLY THE SAME PRESSURE INTO A WASHING COLUMN, WASHING OUT IN SAID WASHING COLUMN THE VINYL CHLORIDE WHICH HAS ESCAPED WITH SAID LOW BOILING CONTAMINATIONS WITH AT LEAST ONE SOLVENT WHICH DOES NOT POLYMERIZE AND HAS A BOILING POINT WHICH IS HIGHER THAN THAT OF VINYL CHLORIDE, ALLOWING THE INERT GASES TO ESCAPE, WITH DRAWING THE VINYL CHLORIDE FROM WHICH THE INERT INERT GASES AND ACETYLENE ARE SEPARATED IN THE FIRST DISTILLATION COLUMN ABOVE THE SUMP OF SAID FIRST DISTILLATION COLUMN, LEADING IT INTO A SECOND DISTILLATION COLUMN OPERATING WITH A REFLUX, AND SEPARATING THE PURE VINYL CHLORIDE IN SAID SECOND DISTILLATION COLUMN FROM THE HIGH BOILING CONTAMINATIONS BY DISTILLATION.