Distillation of polycyclic diol
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsShu Yoshida, Satoshi Nagai, Takashi Konishi, Makoto Sasaki
Life of this patent
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Abstract
Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.
Claims17
A method of purifying a polycyclic diol, which comprises distilling a mixture of the polycyclic diol and at least one aldehyde compound as impurity in the presence of an alkali metal compound and/or an alkaline earth metal compound in a proportion of 200 to 5000 ppm based on the polycyclic diol, at 180°-230° C. under a reduced pressure of 0.1 to 15 mmHg, thereby removing the aldehyde compound from the polycyclic diol, wherein the polycyclic diol is at least one diol selected from the group consisting of tricyclodecane dimethanol, bicycloheptane dimethanol, decalin dimethanol, pentacyclopentadecane dimethanol, and norbornene dimethanol.
A method of purifying a polycyclic diol, which comprises distilling a mixture of the polycyclic diol and at least one aldehyde compound as impurity in the presence of an alkali metal compound and/or an alkaline earth metal compound in a proportion of 300 to 800 ppm based on the polycyclic diol, at 180°-230° C. under a reduced pressure of 0.1 to 15 mmHg, thereby removing the aldehyde compound from the polycyclic diol, wherein the polycyclic diol is selected from the group consisting of tricyclo [5.2.1.02,6] decane dimethanol and pentacyclopentadecane dimethanol.
A method of purifying a polycyclic diol, which comprises distilling a mixture of the polycyclic diol and at least one aldehyde compound as impurity in the presence of an alkali metal compound and/or an alkaline earth metal compound in a proportion of 200 to 5000 ppm based on the polycyclic diol, at 180°-230° C. under a reduced pressure of 0.1 to 15 mmHg, thereby removing the aldehyde compound from the polycyclic diol, wherein the polycyclic diol is tricyclo [5.2.1.02,6] decane dimethanol.
A method of purifying a polycyclic diol, which comprises distilling a mixture of the polycyclic diol and at least one aldehyde compound as impurity in the presence of an alkali metal compound and/or an alkaline earth metal compound in a proportion of 200 to 5000 ppm based on the polycyclic diol, at 180°-230° C. under a reduced pressure of 0.1 to 15 mmHg, thereby removing the aldehyde compound from the polycyclic diol, wherein the polycyclic diol is pentacyclopentadecane dimethanol.
Dependencies are inferred from the claim text.