How to regenerate the filter

A filter and process technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., can solve problems such as the reduction of the purity of purified acrylic acid, and achieve the effect of preventing deterioration of color tone

Active Publication Date: 2011-12-28
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Purified acrylic acid is transferred to a storage tank for storage, but if the purified acrylic acid contains even a trace amount of acrylic acid polymer, acrylic acid polymer is further formed during the storage, and the purity of the purified acrylic acid decreases.

Method used

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  • How to regenerate the filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Drain the acrylic acid remaining in the case. This acrylic acid is recovered and recycled to the aforementioned acrylic acid capture step.

[0056] 2) Water is supplied into the case to wash the filter with water. That is, the continuous operation of draining the water immediately after filling the casing with water was repeated until the pH of the washed water became 6.5. A part of the early washed water is recovered and recycled to the above-mentioned acrylic acid capture step, and the remaining washed water is removed outside the system.

[0057] 3) A 10% by mass sodium hydroxide aqueous solution was supplied into the case to perform alkaline washing of the filter. Alkaline washing is performed as follows. That is, the casing was filled with an aqueous sodium hydroxide solution, and the aqueous sodium hydroxide solution was circulated in the casing by a pump for a while, and then discharged from the casing. This operation was repeated 3 times. The alkaline aq...

Embodiment 2

[0062] In the said process 5), it carried out by the method similar to Example 1 except having set the temperature of the acrylic acid for regeneration to 25 degreeC.

Embodiment 3

[0064] In the said process 5), it carried out by the method similar to Example 1 except having set the temperature of the acrylic acid for regeneration to 15 degreeC.

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Abstract

The present invention provides a method for regenerating a filter that prevents deterioration of the color tone of purified acrylic acid. A method for regenerating a filter, which is a method for regenerating a filter used in the filtration process of an acrylic acid manufacturing process, the method comprising the steps of: washing the filter with an aqueous alkali solution (A); After A), the step (B) of washing the filter with water; after the step (B), the step (C) of contacting the filter with acrylic acid for regeneration for at least 1 hour.

Description

technical field [0001] The present invention relates to a regeneration method of a filter, in particular to a regeneration method of a filter used in the filtration process of the acrylic acid production process. Background technique [0002] Processes for producing acrylic acid through a gas-phase catalytic oxidation process, a trapping and / or condensation process, and a distillation purification and / or crystallization process are widely carried out industrially. Purified acrylic acid is transferred to a storage tank for storage. However, if the purified acrylic acid contains even a trace amount of acrylic acid polymer, acrylic acid polymer is further formed during the storage, and the purity of the purified acrylic acid decreases. [0003] In order to solve the above problems, the inventors of the present invention have previously proposed a method of filtering purified acrylic acid with a filter when transferring it to a storage tank (see Patent Document 1). In this meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06C07C51/42C07C57/04
CPCB01D65/02C07C51/487B01D2321/162B01D2321/164C07C57/04
Inventor 上野晃嗣铃木邦彦菅野笃
Owner NIPPON SHOKUBAI CO LTD
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