A process for producing carbon tetrachloride comprising reacting i) chlorine, ii) a C.sub.1 chlorinated compound comprising 1 to 3 chlorine atoms, and iii) a carbon/second chlorine source, wherein the second chlorine source comprises a range of multichlorinated C.sub.3 hydrocarbons, said range being obtained as waste products from the industrial production of 1,1,1,2,3-pentachloropropane and/or 1,1,3,3-tetrachloropropene.

A process for producing carbon tetrachloride comprising reacting i) chlorine, ii) a C.sub.1 chlorinated compound comprising 1 to 3 chlorine atoms, and iii) a carbon/second chlorine source, wherein the second chlorine source comprises a range of multichlorinated C.sub.3 hydrocarbons, said range being obtained as waste products from the industrial production of 1,1,1,2,3-pentachloropropane and/or 1,1,3,3-tetrachloropropene.

There is provided a halon purification method capable of simply, safely, and efficiently removing mixed bromine molecules to obtain high purity halon. The halon purification method is a method for removing bromine molecules from crude halon containing halon and the bromine molecules, and the method includes: a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid; and a separation step of separating the halon from the mixed liquid to obtain the halon and the absorbing liquid having absorbed the bromine molecules.

There is provided a halon purification method capable of simply, safely, and efficiently removing mixed bromine molecules to obtain high purity halon. The halon purification method is a method for removing bromine molecules from crude halon containing halon and the bromine molecules, and the method includes: a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid; and a separation step of separating the halon from the mixed liquid to obtain the halon and the absorbing liquid having absorbed the bromine molecules.

There is provided a halon purification method capable of simply, safely, and efficiently removing mixed bromine molecules to obtain high purity halon. The halon purification method is a method for removing bromine molecules from crude halon containing halon and the bromine molecules, and the method includes: a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid; and a separation step of separating the halon from the mixed liquid to obtain the halon and the absorbing liquid having absorbed the bromine molecules.

Provided is a method for storing a fluoro-2-butene by which isomerization reaction is unlikely to proceed during storage. A fluoro-2-butene represented by general formula C.sub.4H.sub.xF.sub.y where x is 0 or more and 7 or less, y is 1 or more and 8 or less, and x+y is 8 contains or does not contain hydrogen chloride as an impurity. The fluoro-2-butene is stored in a container in which the concentration of hydrogen chloride is 100 ppm by volume or less in a gas phase portion when the fluoro-2-butene contains hydrogen chloride.

Provided is a method for storing a fluoro-2-butene by which isomerization reaction is unlikely to proceed during storage. A fluoro-2-butene represented by general formula C.sub.4H.sub.xF.sub.y where x is 0 or more and 7 or less, y is 1 or more and 8 or less, and x+y is 8 contains or does not contain hydrogen chloride as an impurity. The fluoro-2-butene is stored in a container in which the concentration of hydrogen chloride is 100 ppm by volume or less in a gas phase portion when the fluoro-2-butene contains hydrogen chloride.

Provided is a method for storing a fluorobutene by which decomposition is unlikely to proceed during storage. A fluorobutene represented by general formula C.sub.4H.sub.xF.sub.y where x is 0 or more and 7 or less, y is 1 or more and 8 or less, and x+y is 8 contains or does not contain at least one of manganese, cobalt, nickel, and silicon as a metal impurity. The fluorobutene is stored in a container in which the total concentration of manganese, cobalt, nickel, and silicon is 1,000 ppb by mass or less when containing at least one of manganese, cobalt, nickel, and silicon.

Provided is a method for storing a fluorobutene by which decomposition is unlikely to proceed during storage. A fluorobutene represented by general formula C.sub.4H.sub.xF.sub.y where x is 0 or more and 7 or less, y is 1 or more and 8 or less, and x+y is 8 contains or does not contain at least one of manganese, cobalt, nickel, and silicon as a metal impurity. The fluorobutene is stored in a container in which the total concentration of manganese, cobalt, nickel, and silicon is 1,000 ppb by mass or less when containing at least one of manganese, cobalt, nickel, and silicon.

The present invention provides a process for preparing 1,1,1,2,2-pentafluoropropane (245cb), the process comprising gas phase catalytic dehydrochlorination of a composition comprising 1,1,1-trifluoro-2,3-dichloropropane (243db) to produce an intermediate composition comprising 3,3,3-trifluoro-2-chloro-prop-1-ene (CF.sub.3CCI═CH.sub.2, 1233xf), hydrogen chloride (HCl) and, optionally, air; and gas phase catalytic fluorination with hydrogen fluoride (HF) of the intermediate composition to produce a reactor product composition comprising 245cb, HF, HCl and air; wherein the process is carried out with a co-feed of air.