Method for distilling (meth) acrylic acid solution
AssigneeNippon Shokubai Co., Ltd.
InventorsKazuhiko Sakamoto, Sei Nakahara, Yukihiro Matsumoto, Kenji Sanada, Masatoshi Ueoka
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Abstract
A method for distilling a raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents, collected with a collection agent from a mixed gas obtained by gas phase catalytic oxidation reactions which includes feeding to a distillation column the raw material liquid which temperature is substantially equal to that of the entrance place in the column.
Claims18
A method for distilling a raw material liquid containing (meth)acrylic acid free from azeotropic solvents, which comprises;
- subjecting gas phase catalytic oxidation reaction of propylene and/or acrolein with a molecular oxygen-containing gas or by gas phase catalytic oxidation reaction of at least one selected from the group consisting of isobutylene, t-butyl alcohol and methacrolein with the molecular oxygen-containing gas to form a mixed gas;
- feeding the resulting mixed gas to a (meth)acrylic acid collection column wherein materials containing (meth)acrylic acid are collected with a collection agent to form the raw material liquid containing (meth)acrylic acid free from azeotropic solvents;
- feeding to a distillation column the raw material liquid containing (meth)acrylic acid free from azeotropic solvents which temperature is substantially equal to that of an entrance place in the column;
- and
- distilling the raw material liquid in the distillation column,
- wherein the temperature of the raw material liquid is adjusted by heating or cooling.
A method for distilling a raw material liquid containing (meth)acrylic acid free from azeotropic solvents, which comprises;
- subjecting gas phase catalytic oxidation reaction of propylene and/or acrolein with a molecular oxygen-containing gas or by gas phase catalytic oxidation reaction of at least one selected from the group consisting of isobutylene, t-butyl alcohol and methacrolein with the molecular oxygen-containing gas to form a mixed gas;
- feeding the resulting mixed gas to a (meth)acrylic acid collection column wherein materials containing (meth)acrylic acid are collected with a collection agent to form the raw material liquid;
- feeding to a distillation column the raw material liquid containing (meth)acrylic acid free from azeotropic solvents which temperature is substantially equal to that of an entrance place in the column;
- and
- distilling the raw material liquid in the distillation column,
- wherein the temperature of the raw material liquid to be fed (T0) and a temperature of the entrance place in the distillation column (T1) fulfill the following formula (1a):
- 0° C.≦|T0−T1|≦30° C. (1a).
A method for distilling a raw material liquid containing (meth)acrylic acid free from azeotropic solvents, which comprises;
- subjecting gas phase catalytic oxidation reaction of propylene and/or acrolein with a molecular oxygen-containing gas or by gas phase catalytic oxidation reaction of at least one selected from the group consisting of isobutylene, t-butyl alcohol and methacrolein with the molecular oxygen-containing gas to form a mixed gas;
- feeding the resulting mixed gas to a (meth)acrylic acid collection column wherein materials containing (meth)acrylic acid are collected with a collection agent to form the raw material liquid containing (meth)acrylic acid free from azeotropic solvents;
- feeding to a distillation column the raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents which temperature is substantially equal to that of an entrance place in the column;
- and
- distilling the raw material liquid in the distillation column, wherein a fluctuation range (ΔT0) of temperature (T0) of the raw material liquid is within 10° C.
Dependencies are inferred from the claim text.