Compositions based on 1,1,3,3-tetrachloropropene

Abstract

Compositions based on F-1230za (1,1,3,3-tetrachloropropene), or on a mixture consisting of F-1230za and F-1230zd (1,3,3,3-tetrachloropropene), the manufacture thereof, and also the use thereof in particular for the production of F-1233zdE (trans-1-chloro-3,3,3-trifluoropropene), F-1234zeE (trans-1,3,3,3-tetrafluoropropene), and/or F-245fa (1,1,1,3,3-pentafluoropropane). A process for manufacturing the composition, the process including the following steps: reaction of carbon tetrachloride with ethylene to produce 1,1,1,3-tetrachloropropane (F-250fb); chlorination of F-250fb to obtain 1,1,1,3,3-pentachloropropane (F-240fa); dehydrochlorination of F-240fa to obtain 1,1,3,3-tetrachloropropene (F-1230za); one or more steps for separating out the F-1230za.

1 . A composition comprising at least 99.5% by weight of 1,1,3,3-tetrachloropropene (F-1230za), or a mixture of 1,1,3,3-tetrachloropropene and of 1,3,3,3-tetrachloropropene (F-1230zd), and at least one additional compound chosen from a list of compounds consisting of pentachloropropanes, tetrachloropropenes other than F-1230za and F-1230zd, chlorobutenes, chlorobutanes and oxygenated compounds, said compound and/or the total amount of said compounds being present in the composition in a content of less than or equal to 0.5% by weight. 
     
     
         2 . The composition as claimed in  claim 1 , in which said additional compound represents a content of less than or equal to 1000 ppm; or less than or equal to 500 ppm; or less than or equal to 450 ppm; or less than or equal to 400 ppm; or less than or equal to 350 ppm; or less than or equal to 300 ppm; or less than or equal to 250 ppm; or less than or equal to 200 ppm; or less than or equal to 150 ppm; or less than or equal to 100 ppm; or less than or equal to 75 ppm; or less than or equal to 50 ppm; or less than or equal to 25 ppm; or less than or equal to 10 ppm; or less than or equal to 5 ppm, in the composition. 
     
     
         3 . The composition as claimed in  claim 2 , in which said additional compound is or are chosen from 1,1,1,3,3-pentachloropropane (F-240fa), 1,1,1,2,3-pentachloropropane (F-240db) and 1,1,2,3-tetrachloropropene (F-1230xa). 
     
     
         4 . A process for manufacturing the composition as claimed in  claim 1 , comprising the following steps:
 reaction of carbon tetrachloride with vinyl chloride to produce 1,1,1,3,3-pentachloropropane (F-240fa);   dehydrochlorination of F-240fa to obtain 1,1,3,3-tetrachloropropene (F-1230za);   one or more steps for separating out the F-1230za.   
     
     
         5 . A process for manufacturing the composition as claimed in  claim 1 , comprising the following steps:
 reaction of carbon tetrachloride with ethylene to produce 1,1,1,3-tetrachloropropane (F-250fb);   chlorination of F-250fb to obtain 1,1,1,3,3-pentachloropropane (F-240fa);   dehydrochlorination of F-240fa to obtain 1,1,3,3-tetrachloropropene (F-1230za);   one or more steps for separating out the F-1230za.   
     
     
         6 . The process as claimed in  claim 4 , in which the separation is performed by distillation or extraction, and/or by physicochemical separation on molecular sieves, alumina or active charcoal, and/or by membrane separation, optionally in the gas phase. 
     
     
         7 . The process as claimed in  claim 6 , in which a first separation step is performed via one or more distillations and a second separation step is performed by adsorption on molecular sieves, on active charcoal or on a mixture thereof. 
     
     
         8 . The process as claimed in  claim 6 , in which the separation step is performed by adsorption on zeolite, of the type such as 4A, 5A, 10× or 13× molecular sieves, and optionally followed by gas-phase membrane separation. 
     
     
         9 . The process as claimed in  claim 6 , in which the step of separation by adsorption is performed at a temperature of between 0 and 120° C. and preferably between 20 and 80° C. 
     
     
         10 . The use of the composition as claimed in  claim 1  in the manufacture of 1-chloro-3,3,3-trifluoropropene (F-1233zd), 1,3,3,3-tetrafluoropropene (F-1234ze) or 1,1,1,3,3-pentafluoropropane (F-245fa). 
     
     
         11 . A process for manufacturing 1-chloro-3,3,3-trifluoropropene (F-1233zd), and/or 1,3,3,3-tetrafluoropropene (F-1234ze) and/or 1,1,1,3,3-pentafluoropropane (F-245fa), by fluorination performed in the liquid phase and in the absence of catalyst, comprising the steps:
 of introducing into a fluorination reactor a stream comprising the composition as in  claim 1 .   
     
     
         12 . The process as claimed in  claim 11  for forming trans-1-chloro-3,3,3-trifluoropropene (F-1233zdE) or trans-1,3,3,3-tetrafluoropropene (F-1234zeE). 
     
     
         13 . The process as claimed in  claim 11 , followed by one or more steps for separating 1-chloro-3,3,3-trifluoropropene (F-1233zd), and/or 1,3,3,3-tetrafluoropropene (F-1234ze) and/or 1,1,1,3,3-pentafluoropropane (F-245fa) from the stream of products.