Process for producing adamantane
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsTakeshi Kawai, Mitsuharu Kitamura
Life of this patent
Estimating the term…
Abstract
A method for producing adamantane by performing an isomerization reaction in two stages using endo-tetrahydrodicyclopentadiene and/or exo-tetrahydrodicyclopentadiene as a starting material, wherein in a first-stage isomerization reaction from endo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) to exo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane), an HF catalyst alone or two catalysts of an HF catalyst and a BF3 catalyst are used in the absence of a solvent; and in a second-stage isomerization reaction from exo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) to adamantane (tricyclo[3.3.1.13,7]decane), an HF catalyst and a BF3 catalyst are used in the absence of a solvent.
Claims5
A method for producing adamantane (tricyclo[3.3.1.13,7]decane) by performing an isomerization reaction in two stages using endo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) or a mixture of endo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) and exo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) as a starting material;
- comprising the steps of:
- producing exo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) from endo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) using an HF catalyst alone or two catalysts of an HF catalyst and a BF3 catalyst in the absence of a solvent in a first-stage reactor for a first-stage isomerization reaction;
- and
- producing adamantine (tricyclo[3.3.1.13,7]decane) from the exo-tetrahydrodicyclopentadiene (tricyclo[5.2.1.02,6]decane) using an HF catalyst and a BF3 catalyst in the absence of a solvent in a second-stage reactor for a second-stage isomerization reaction
- wherein the temperature is controlled such that a reaction temperature (T1, unit:
- ° C.) in the first-stage isomerization reaction and a reaction temperature (T2, unit:
- ° C.) in the second-stage isomerization reaction fulfill the following expressions (1) and (2)
- 0≦T1≦50 (1)
- T1≦T2≦T1+30 (2).
Dependencies are inferred from the claim text.