Provided is a method for producing a propylene oligomer, which is advantageous in that a lowly branched propylene oligomer can be obtained at high selectivity. A method for producing a propylene oligomer, including an oligomerization step of oligomerizing propylene at lower than 160° C. in the presence of at least one member selected from a group consisting of a catalyst containing crystalline molecular sieve and a catalyst containing phosphoric acid, a fractional distillation step of obtaining a fraction containing a propylene trimer, a propylene tetramer, or a mixture thereof, and an isomerization step of isomerizing the propylene trimer, propylene tetramer, or mixture thereof contained in the fraction in the presence of a catalyst containing phosphoric acid.

Provided is a method for producing a propylene oligomer, which is advantageous in that a lowly branched propylene oligomer can be obtained at high selectivity. A method for producing a propylene oligomer, including an oligomerization step of oligomerizing propylene at lower than 160° C. in the presence of at least one member selected from a group consisting of a catalyst containing crystalline molecular sieve and a catalyst containing phosphoric acid, a fractional distillation step of obtaining a fraction containing a propylene trimer, a propylene tetramer, or a mixture thereof, and an isomerization step of isomerizing the propylene trimer, propylene tetramer, or mixture thereof contained in the fraction in the presence of a catalyst containing phosphoric acid.

Systems and methods for isomerizing n-butane to form isobutane are disclosed. A segmented reactor system is used to isomerize n-butane. The segmented reactor system comprises a segmented reactor that includes a first catalyst bed and a second catalyst bed separated by a first heat exchanger. The catalyst in the first catalyst bed does not contact the catalyst in the second catalyst bed. During the exothermic process of isomerizing n-butane, the first heat exchanger extracts heat from an intermediate product flowing from the first catalyst bed to the second catalyst bed to improve the conversion rate of n-butane.

Systems and methods for isomerizing n-butane to form isobutane are disclosed. A segmented reactor system is used to isomerize n-butane. The segmented reactor system comprises a segmented reactor that includes a first catalyst bed and a second catalyst bed separated by a first heat exchanger. The catalyst in the first catalyst bed does not contact the catalyst in the second catalyst bed. During the exothermic process of isomerizing n-butane, the first heat exchanger extracts heat from an intermediate product flowing from the first catalyst bed to the second catalyst bed to improve the conversion rate of n-butane.

Systems and methods for isomerizing n-butane to form isobutane are disclosed. A segmented reactor system is used to isomerize n-butane. The segmented reactor system comprises a segmented reactor that includes a first catalyst bed and a second catalyst bed separated by a first heat exchanger. The catalyst in the first catalyst bed does not contact the catalyst in the second catalyst bed. During the exothermic process of isomerizing n-butane, the first heat exchanger extracts heat from an intermediate product flowing from the first catalyst bed to the second catalyst bed to improve the conversion rate of n-butane.

Systems and methods for isomerizing n-butane to form isobutane are disclosed. A segmented reactor system is used to isomerize n-butane. The segmented reactor system comprises a segmented reactor that includes a first catalyst bed and a second catalyst bed separated by a first heat exchanger. The catalyst in the first catalyst bed does not contact the catalyst in the second catalyst bed. During the exothermic process of isomerizing n-butane, the first heat exchanger extracts heat from an intermediate product flowing from the first catalyst bed to the second catalyst bed to improve the conversion rate of n-butane.

A new family of crystalline microporous metallophosphates designated AlPO-78 has been synthesized. These metallophosphates are represented by the empirical formula
R.sup.+.sub.rM.sub.m.sup.2+EP.sub.xSi.sub.yO.sub.z
where R is an organoammonium cation, M is a framework metal alkaline earth or transition metal of valence +2, and E is a trivalent framework element such as aluminum or gallium. The AlPO-78 compositions are characterized by a new unique ABC-6 net structure, and have catalytic properties suitable for carrying out various hydrocarbon conversion processes, as well as characteristics suitable for the efficient adsorption of water vapor in a variety of applications, such as adsorption heat pumps.

A new family of crystalline microporous metallophosphates designated AlPO-78 has been synthesized. These metallophosphates are represented by the empirical formula

R.sup.+.sub.rM.sub.m.sup.2+EP.sub.xSi.sub.yO.sub.z

where R is an organoammonium cation, M is a framework metal alkaline earth or transition metal of valence +2, and E is a trivalent framework element such as aluminum or gallium. The AlPO-78 compositions are characterized by a new unique ABC-6 net structure, and have catalytic properties suitable for carrying out various hydrocarbon conversion processes, as well as characteristics suitable for the efficient adsorption of water vapor in a variety of applications, such as adsorption heat pumps.