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 fluoride as an impurity. The fluoro-2-butene is stored in a container in which the concentration of hydrogen fluoride is 100 ppm by volume or less in a gas phase portion when the fluoro-2-butene contains hydrogen fluoride.

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 fluoride as an impurity. The fluoro-2-butene is stored in a container in which the concentration of hydrogen fluoride is 100 ppm by volume or less in a gas phase portion when the fluoro-2-butene contains hydrogen fluoride.

The present invention concerns new stable compositions of 1-Z-bromoalk-1-ene compounds of general formula (A). These compositions are characterized in that they also comprise either at least one cyclic ether compound comprising between 4 and 6 carbon atoms, or at least one ether of general formula (B) in which R.sub.1 and R.sub.2 are identical or different and selected from the group consisting of: a linear or branched alkyl group containing 1 to 8 carbon atoms.

The present invention concerns new stable compositions of 1-Z-bromoalk-1-ene compounds of general formula (A). These compositions are characterized in that they also comprise either at least one cyclic ether compound comprising between 4 and 6 carbon atoms, or at least one ether of general formula (B) in which R.sub.1 and R.sub.2 are identical or different and selected from the group consisting of: a linear or branched alkyl group containing 1 to 8 carbon atoms.

The object is to selectively separate a linear compound from a treatment subject containing linear and alicyclic compounds as double bond-containing hydrocarbon compounds in which every hydrogen is replaced with fluorine or chlorine. A method of separating a double bond-containing linear hydrocarbon in which every hydrogen is replaced with fluorine or chlorine includes bringing a treatment subject containing a double bond-containing linear hydrocarbon in which every hydrogen is replaced with fluorine or chlorine and a double bond-containing alicyclic hydrocarbon in which every hydrogen is replaced with fluorine or chlorine into contact with at least one amine compound selected from the group consisting of a heterocyclic aromatic amine compound and a tertiary amine represented by a formula: NR.sup.1R.sup.2R.sup.3 (R.sup.1, R.sup.2, and R.sup.3 are each independently an alkyl group, and two thereof may in combination form an alkylene group that is optionally interrupted by oxygen or sulfur).

The object is to selectively separate a linear compound from a treatment subject containing linear and alicyclic compounds as double bond-containing hydrocarbon compounds in which every hydrogen is replaced with fluorine or chlorine. A method of separating a double bond-containing linear hydrocarbon in which every hydrogen is replaced with fluorine or chlorine includes bringing a treatment subject containing a double bond-containing linear hydrocarbon in which every hydrogen is replaced with fluorine or chlorine and a double bond-containing alicyclic hydrocarbon in which every hydrogen is replaced with fluorine or chlorine into contact with at least one amine compound selected from the group consisting of a heterocyclic aromatic amine compound and a tertiary amine represented by a formula: NR.sup.1R.sup.2R.sup.3 (R.sup.1, R.sup.2, and R.sup.3 are each independently an alkyl group, and two thereof may in combination form an alkylene group that is optionally interrupted by oxygen or sulfur).

The object is to selectively separate a linear compound from a treatment subject containing linear and alicyclic compounds as double bond-containing hydrocarbon compounds in which every hydrogen is replaced with fluorine or chlorine. A method of separating a double bond-containing linear hydrocarbon in which every hydrogen is replaced with fluorine or chlorine includes bringing a treatment subject containing a double bond-containing linear hydrocarbon in which every hydrogen is replaced with fluorine or chlorine and a double bond-containing alicyclic hydrocarbon in which every hydrogen is replaced with fluorine or chlorine into contact with at least one amine compound selected from the group consisting of a heterocyclic aromatic amine compound and a tertiary amine represented by a formula: NR.sup.1R.sup.2R.sup.3 (R.sup.1, R.sup.2, and R.sup.3 are each independently an alkyl group, and two thereof may in combination form an alkylene group that is optionally interrupted by oxygen or sulfur).

The solid composite stabilizer for PCE includes the following components in parts by weight: 10 to 30 parts of a phenol-substituted ion-exchange resin, 50 to 80 parts of a basic anion-exchange resin, and 50 to 100 parts of a desiccating agent. The phenol-substituted ion-exchange resin is chloromethylated macroporous polystyrene-divinylbenzene (PS-DVB) substituted by a phenolic compound; and the basic anion-exchange resin is chloromethylated macroporous PS-DVB substituted by an amine compound. The preparation method includes the following step: thoroughly mixing the phenol-substituted ion-exchange resin, the basic anion-exchange resin, and the desiccating agent in a specified ratio to obtain the solid composite stabilizer for PCE. The solid composite stabilizer for PCE is packaged in a glass fiber bag and placed in PCE for storage and use.

The solid composite stabilizer for PCE includes the following components in parts by weight: 10 to 30 parts of a phenol-substituted ion-exchange resin, 50 to 80 parts of a basic anion-exchange resin, and 50 to 100 parts of a desiccating agent. The phenol-substituted ion-exchange resin is chloromethylated macroporous polystyrene-divinylbenzene (PS-DVB) substituted by a phenolic compound; and the basic anion-exchange resin is chloromethylated macroporous PS-DVB substituted by an amine compound. The preparation method includes the following step: thoroughly mixing the phenol-substituted ion-exchange resin, the basic anion-exchange resin, and the desiccating agent in a specified ratio to obtain the solid composite stabilizer for PCE. The solid composite stabilizer for PCE is packaged in a glass fiber bag and placed in PCE for storage and use.

Provided is a method for producing a working medium containing difluoroethylene, the difluoroethylene not having self-decomposition properties.

A method for producing a working medium containing difluoroethylene.