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OwnerViktor Ivanovich Zhukov, Nikolai Petrovich Shestak +8inventors
InventorsViktor Ivanovich Zhukov, Nikolai Petrovich Shestak, Gennady Petrovich Belov, Maria Nikolaevna Dyadjunova, Leonid Alexandrovich Shilov, Ivan Davydovich Shevlyakov, Fridrikh Stepanovich Dyachkovsky, Alexandr Grigorievich Liakumovich, Pavel Alexandrovich Vernov, Jury Mikhailovich Sivakov
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The method of dimerization of alpha-olefins consists in mixing at least one alpha-olefin with a two-component catalyst consisting of organic compounds of titanium, having the general formula Ti (OR).sub.4, and of aluminum, having the general formula AlR.sub.3, where R is an alkyl having from 1 to 6 carbon atoms, or an aryl, in a medium of a hydrocarbon solvent, at a temperature of 0.degree. to 100.degree. C and a pressure from 1 to 30 atm. Said constituents of the catalyst are pretreated with an ethylene-hydrogen mixture, containing from 5 to 95 percent by volume of hydrogen, at a temperature of from 0.degree. to 100.degree. C and a pressure of the ethylene-hydrogen mixture from 0.2 to 15 atm., for a period of time from 1 to 120 minutes. The method ensures high yields of butene-1 and hexenes, and high selectivity of the catalyst to said products. The butene-1 content of the butane mixture obtained in the process of ethylene dimerization is as high as 99 percent. The yield of butene-1 is from 80 to 345 g per gram of Ti(OR).sub.4 per hour. The hexene content in the dimerizate obtained in the process of dimerization of propylene, or a mixture of ethylene and butene-1, is 25 percent. The yield of hexenes is from 4 to 80 g per gram of Ti(OR).sub.4 per hour. The formation of polymers is significantly reduced.
In a method for the dimerization of alpha-olefins, wherein at least one alpha-olefin is mixed with a two component catalyst consisting of organic compounds of titanium, having the general formula Ti(OR).sub.4, and of aluminum, having the general formula AlR.sub.3, where R is an alkyl having from 1 to 6 carbon atoms, or an aryl, in a medium of a hydrocarbon solvent, at a temperature from 0.degree. to 100.degree. C, and a pressure of alpha-olefins from 1 to 30 atm., the improvement which comprises the pretreatment of said constituents with an ethylene-hydrogen mixture containing from 5 to 95 percent by volume of hydrogen, said pretreatment being effected at a temperature of about 0.degree. to 100.degree. C, and a pressure of the ethylene-hydrogen mixture of about 0.2 to 15 atm., for about 1 to 120 minutes.
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