Method of dehalogenating hydrocarbon containing carbon-carbon double bond
AssigneeNippon Petrochemicals Company, Limited
InventorsKoichi Ohashi, Tsutomu Takashima, Teruhisa Kuroki, Koji Fujimura, Yuichi Tokumoto
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Abstract
An efficient dehalogenation can be carried out by a method which comprises treating an organic compound containing a compound of halogen, such as fluorine or chlorine, as an impurity and having non-conjugated carbon-carbon double bonds, for example, butene polymer produced with a boron trifluoride catalyst, with an inorganic solid treating agent containing aluminum atoms. When the dehalogenation is conducted in the presence of a basic substance such as ammonia or an amine, it can be continued over long while inhibiting the isomerization of the non-conjugated carbon-carbon double bonds.
Claims43
A method for producing butene polymer having a low halogen content and a high terminal vinylidene content, comprising:
- step (I) feeding into a polymerization zone a starting material of C4 components comprising less than 50% by mass of 1-butene, less than 50% by mass of 2-butene, less than 100% by mass of isobutene, less than 50% by mass of butanes and less than 10% by mass of butadiene, 0.1 to 500 mmole of boron trifluoride relative to 1 mole of isobutene contained in said starting material, and 0.03 to 1,000 mmole of alcohol and/or dialkyl ether as complexing agents relative to 1 mole of isobutene contained in said starting material, and carrying out liquid-phase polymerization continuously at a polymerization temperature in the range of −100° C. to +50° C. and for a residence time in the range of 5 minutes to 4 hours;
- step (II) deactivating the catalyst contained in the effluent reaction mixture from the polymerization zone, then optionally subjecting the reaction mixture to distillation, to obtain butene polymer containing residual halogen of 1 ppm or more and terminal vinylidene group of 60% or more;
- and
- step (III) contacting said butene polymer with an inorganic solid treating agent containing aluminum atoms, while maintaining the coexistence of a basic substance in an amount to suppress isomerization of said terminal vinylidene group, thereby obtaining butene polymer containing 40 ppm or less of residual halogen and maintaining the content of terminal vinylidene group of 60% or more relative to the value before the treatment.
A method for removing halogen as an impurity, which method comprises the step of bringing an organic compound containing a halogen compound as an impurity and having one or more of non-conjugated carbon-carbon double bonds, into contact with an inorganic solid treating agent containing aluminum atoms to remove halogen, while maintaining the reaction system in the coexistence of a basic substance in an mount sufficient to suppress the isomerization of said carbon-carbon double bonds in the organic compound.
A method for removing halogen as an impurity, which method comprises the step of bringing an organic compound containing a halogen compound as an impurity and having one or more non-conjugated carbon-carbon double bonds, into contact with an inorganic solid treating agent containing aluminum atoms to remove halogen, while feeding a basic substance into said organic compound continuously or intermittently in the amount sufficient to suppress the isomerization of said carbon-carbon double bonds in the organic compound.
A method for removing halogen as an impurity, which comprises the step of bringing butene polymer of a high terminal vinylidene content that is produced by polymerizing isobutene using a halogen-containing catalyst, into contact with an inorganic solid treating agent containing aluminum atoms, thereby removing halogen, while maintaining the coexistence of a basic substance in the amount sufficient to suppress the isomerization of the terminal vinylidene group in said butene polymer.
A method for removing halogen as an impurity, which comprises the step of bringing butene polymer of a high terminal vinylidene content that is produced by polymerizing isobutene using a halogen-containing catalyst, into contact with an inorganic solid treating agent containing aluminum atoms, thereby removing halogen, while feeding a basic substance into said butene polymer continuously or intermittently in the amount sufficient to suppress the isomerization of said terminal vinylidene group.
A method for producing butene polymer, which comprises the step of bringing butene polymer containing 1 ppm or more of residual halogen and 60% or more of terminal vinylidene group into contact with an inorganic solid treating agent containing aluminum atoms to remove halogen, while maintaining, in the reaction system, the coexistence of a basic substance in the amount to suppress the isomerization of said terminal vinylidene group, thereby obtaining butene polymer containing 40 ppm or less of residual halogen and the content of terminal vinylidene group of 60% or more relative to value before treatment.
A method for removing halogen as an impurity, which comprises the step of bringing monoolefin containing a halogen compound as an impurity into contact with an inorganic solid treating agent containing aluminum atoms to remove halogen, while maintaining, in the reaction system, the coexistence of a basic substance in the amount sufficient to suppress the isomerization of carbon-carbon double bonds of the monoolefin.
A method for removing halogen as an impurity, which comprises the step of bringing monoolefin containing a halogen compound as an impurity into continuous contact with an inorganic solid treating agent containing aluminum atoms to remove halogen, while feeding a basic substance into said monoolefin continuously or intermittently in an amount sufficient to suppress the isomerization of carbon-carbon double bonds of the monoolefin.
A method for regenerating an inorganic solid treating agent containing aluminum, which comprises the step of bringing an inorganic solid treating agent containing aluminum atoms having an increased ability of isomerizing non-conjugated carbon-carbon double bonds as the result of fixing halogen, into contact with a basic substance, thereby reducing the isomerizing ability of said treating agent.
A method for producing a highly reactive butene oligomer, which comprises:
- removing hydrogen fluoride by contacting the butene oligomer with an inorganic solid treating agent, said butene oligomer containing 80% by mole or more of repeating structural units as represented by the following formula [1], 60% by mole or more of molecules having terminal vinylidene groups on one side as represented by the following formula [2] and 0.005 to 15% by mole of molecules having fluorinated terminal groups as represented by the following formula [3], thereby converting the fluorinated terminal groups of said formula [3] into the terminal vinylidene groups of said formula [2]:
- wherein n represents an integer of 1 or more.
A method for producing a highly reactive butene oligomer containing 80% by mole or more of repeating structural units as represented by the following formula [1] and 80% by mole or more of molecules having terminal vinylidene groups on one side as represented by the following formula [2],
- wherein n represents an integer of 0 or more, said method comprising:
- Step (I) carrying out liquid-phase polymerization of olefin in the presence of a boron trifluoride complex catalyst comprising boron trifluoride and a complexing agent;
- Step (II) deactivating the boron trifluoride complex catalyst in a reaction mixture after the polymerization;
- Step (III) obtaining the butene oligomer which contains 80% by mole or more of repeating structural units as represented by the following formula [1], 60% by mole or more of molecules having terminal vinylidene groups on one side as represented by the following formula [2] and 0.005 to 15% by mole of molecules having fluorinated terminal groups as represented by the following formula [3]
- and
- Step (IV) treating the oligomer obtained in said step (III) with an inorganic solid treating agent to carry out the reaction to remove hydrogen fluoride, thereby converting fluorinated terminal groups as represented by the formula [3] into terminal vinylidene groups as represented by the formula [2].
Dependencies are inferred from the claim text.