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

1. A composition comprising:

at least 99.5% by weight of 1,1,3,3-tetrachloropropene (F-1230za), or at least 99.5% by weight of a mixture comprising 1,1,3,3-tetrachloropropene and 1,3,3,3-tetrachloropropene (F-1230zd), and

at least one additional compound selected from the group consisting of chlorobutenes and chlorobutanes, wherein the amount of said additional compound or the total amount of said compounds represents a content of less than or equal to 500 ppm, in the composition.

2. The composition as claimed in claim 1 , in which said additional compound represents a content of less than or equal to 450 ppm, in the composition.

3. The composition as claimed in claim 1 , in which said additional compound is selected from the group consisting of monochlorobutanes, dichlorobutanes, trichlorobutanes, and tetrachlorobutanes.

4. The composition as claimed in claim 3 , in which said additional compound is selected from the group consisting of 1,1,4,4-tetrachlorobutane, 1,2,3,4-tetrachlorobutane, 1,1,1,3-tetrachlorobutane, and 1,1,3,3-tetrachlorobutane.

5. The composition as claimed in claim 1 , in which said additional compound is selected from the group consisting of monochlorobutenes, dichlorobutenes, trichlorobutenes, and tetrachlorobutenes.

6. The composition as claimed in claim 5 , in which said additional compound is selected from the group consisting of 1,2,4-trichlorobut-2-ene, 1,3-dichloro-2-chloromethylpropene, 1,1,3-trichlorobut-1-ene, 4,4,4-trichlorobut-1-ene, 1,2,3-trichloro-1-butene, 3,4,4-trichloro-1-butene, 2-chloromethyl-3,3-dichloropropene, 1,1,4-trichlorobut-2-ene, 3,3,4-trichlorobut-1-ene, 1,1,3-trichlorobut-2-ene, 1,3,3-trichlorobut-1-ene, 1,1,2-trichlorobut-1-ene, 1,1,1-trichlorobut-2-ene, 1,1,4-trichlorobut-2-ene, 1,3,4-trichlorobut-1-ene, 1,1,2-trichlorobut-2-ene, 1,2,3-trichlorobut-2-ene, 2-methyl-1,1,3-trichloro-1-propene, 1,2,4-trichlorobut-2-ene, and 2,3,4-trichlorobut-1-ene.

7. 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.

8. The process as claimed in claim 7 , 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.

9. The process as claimed in claim 8 , 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.

10. The process as claimed in claim 8 , in which the separation step is performed by adsorption on zeolite, and optionally followed by gas-phase membrane separation.

11. The process as claimed in claim 8 , in which the step of separation by adsorption is performed at a temperature of between 0 and 120° C.

12. 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.

13. 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:

introducing into a fluorination reactor a stream comprising the composition as claimed in claim 1 .

14. The process as claimed in claim 13 for forming trans-1-chloro-3,3,3-trifluoropropene (F-1233zdE) or trans-1,3,3,3-tetrafluoropropene (F-1234zeE).

15. The process as claimed in claim 13 , 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.