Separation of m-diisopropyl benzene from p-diisopropyl benzene by extractive distillation
AssigneeLloyd Berg
InventorLloyd Berg
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Abstract
Meta and para-diisopropyl benzenes cannot be easily separated from each other by distillation because of the closeness of their vapor pressures. m-Diisopropyl benzene can be readily removed from p-diisopropyl benzene by extractive distillation using certain high boiling organic compounds. Effective extractive agents are diphenyl ether, dimethyl adipate, diisononyl adipate, tributyl phosphate and ethylene glycol phenyl ether.
Claims5
A method for recovering m-diisopropylbenzene (m-DIPB) from a mixture of m-DIPB and p-diisopropylbenzene (p-DIPB) which comprises distilling a mixture of m-DIPB and p-DIPB in a rectification column in the presence of an extractive agent, recovering the m-DIPB as overhead product and obtaining the p-DIPB and the extractive agent from the stillpot, wherein said extractive agent comprises diphenyl ether.
A method for recovering m-diisopropylbenzene (m-DIPB) from a mixture of m-DIPB and p-diisopropylbenzene (p-DIPB) which comprises distilling a mixture of m-DIPB and p-DIPB in a rectification column in the presence of an extractive agent, recovering the m-DIPB as overhead product and obtaining the p-DIPB and the extractive agent from the stillpot, wherein said extractive agent comprises ethylene glycol phenyl ether.
A method for recovering m-diisopropylbenzene (m-DIPB) from a mixture of m-DIPB and p-diisopropylbenzene (p-DIPB) which comprises distilling a mixture of m-DIPB and p-DIPB in a rectification column in the presence of an extractive agent, recovering the m-DIPB as overhead product and obtaining the p-DIPB and the extractive agent from the stillpot, wherein said extractive agent comprises dimethyl adipate.
A method for recovering m-diisopropylbenzene (m-DIPB) from a mixture of m-DIPB and p-diisopropylbenzene (p-DIPB) which comprises distilling a mixture of m-DIPB and p-DIPB in a rectification column in the presence of an extractive agent, recovering the m-DIPB as overhead product and obtaining the p-DIPB and the extractive agent from the stillpot, wherein said extractive agent comprises diisononyl adipate.
A method for recovering m-diisopropylbenzene (m-DIPB) from a mixture of m-DIPB and p-diisopropylbenzene (p-DIPB) which comprises distilling a mixture of m-DIPB and p-DIPB in a rectification column in the presence of an extractive agent, recovering the m-DIPB as overhead product and obtaining the p-DIPB and the extractive agent from the stillpot, wherein said extractive agent comprises tributyl phosphate.
Dependencies are inferred from the claim text.