Method for production of (meth) acrylic acid and/or (meth)acrylic esters
First Claim
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1. A method for removing solid substances adhered during production of (meth)acrylic acid, which comprises:
- washing a device constructed for the production thereof with a basic solution; and
rinsing it with a solvent until the pH value of the waste water is not more than 9 at 50°
C. for the purpose of removing solid substances such as polymer and precipitate formed during the course of the production, the solid substances being adhered to the surface of a flow way of the (meth)acrylic acid in the device;
wherein removing of adhered solid substance is performed without overhauling of the device.
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Abstract
A method for the production of (meth)acrylic acid and/or a (meth)acrylic ester is provided. This method for the production of (meth)acrylic acid and/or a (meth)acrylic ester includes washing the device constructed for the production thereof with a basic solution and subsequently rinsing them with a solvent for the purpose of removing solid substances such as polymer and precipitate which occur during the production of (meth)acrylic acid and/or a (meth)acrylic ester.
18 Citations
19 Claims
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1. A method for removing solid substances adhered during production of (meth)acrylic acid, which comprises:
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washing a device constructed for the production thereof with a basic solution; and
rinsing it with a solvent until the pH value of the waste water is not more than 9 at 50°
C.for the purpose of removing solid substances such as polymer and precipitate formed during the course of the production, the solid substances being adhered to the surface of a flow way of the (meth)acrylic acid in the device;
wherein removing of adhered solid substance is performed without overhauling of the device. - View Dependent Claims (2, 8, 10, 11)
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3. A method for removing solid'"'"'substances adhered during production of a (meth)acrylic ester, which comprises:
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pre-washing a device constructed for the production thereof with a solvent, washing it with a basic solution; and
rinsing it with a solvent until the pH value of the waste water is not more than 9 at 50°
C.for the purpose of removing solid substances such as polymer and precipitate formed during the course of the production, the solid substances being adhered to the surface of a flow way of the (meth)acrylic ester in the device;
wherein removing of adhered solid substances is performed without overhauling of the device.
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4. A method for removing solid substances adhered during production of (meth)acrylic acid and/or a (meth)acrylic ester, which comprises:
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pre-washing a device constructed for the production thereof with a solvent washing it with a basic solution being a solution of at least one member selected from the group consisting of an oxide, hydroxide, carbonate, and hydrogen carbonate of an alkali metal and an oxide and hydroxide of an alkaline earth metal; and
rinsing it with a solvent until the pH value of the waste water is not more than 9 at 50°
C.for the purpose of removing solid substances such as polymer and precipitate formed during the course of the production, the solid substances being adhered to the surface of a flow way of the (meth)acrylic acid and/or the (meth)acrylic ester in the device;
wherein removing of adhered solid substances is performed without overhauling of the device. - View Dependent Claims (5, 6, 7, 9, 12, 13, 14, 15, 16)
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17. A method for removing solid substances adhered during production of (meth)acrylic acid and/or a (meth)acrylic ester, which comprises:
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pre-washing a device constructed for the production thereof with a solvent washing it under a reduced pressure with a basic solution being a solution of at least one member selected from the group consisting of an oxide, hydroxide, carbonate, and hydrogen carbonate of an alkali metal and an oxide and hydroxide of an alkaline earth metal; and
rinsing it with a solvent under a reduced pressure until the pH value of the waste water is not more than 9 at 50°
C.for the purpose of removing solid substances such as polymer and precipitate formed during the course of the production, the solid substances being adhered to the surface of a flow way of the (meth)acrylic acid and/or the (meth)acrylic ester in the device. - View Dependent Claims (18, 19)
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Specification