Method for treating wastewater of methyl methacrylate device

A methyl methacrylate and wastewater treatment technology, which is applied in the directions of heating water/sewage treatment, extraction water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as difficult to meet the requirements of biochemical treatment, and meet the requirements of biochemical treatment required effect

Pending Publication Date: 2021-12-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a method for wastewater treatment of methyl methacrylate plant, to solve the problem in the prior art that it is difficult to meet the requirements of biochemical treatment after wastewater treatment

Method used

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  • Method for treating wastewater of methyl methacrylate device
  • Method for treating wastewater of methyl methacrylate device
  • Method for treating wastewater of methyl methacrylate device

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Take the wastewater from a methyl methacrylate plant in a domestic factory.

[0037] Extractant preparation: its components include: n-hexane, cyclohexane, octanol. The mass ratio of each component is: n-hexane:cyclohexane:octanol=96:2.5:1.5. Mix n-hexane, cyclohexane and octanol according to the proportion and stir evenly to prepare the extractant.

[0038] The extraction process is as follows: the extraction quality of extractant and waste water is 1:10, the extraction temperature is 298K, the stirring speed is 40r / min, the stirring time is 15min, and the standing time is 30min, and then the methyl methacrylate is extracted and separated to obtain the extracted Yu phase.

[0039] Add alkali (sodium hydroxide) to the raffinate phase to adjust the pH to 7.0.

[0040] The rectification process is: the total height of the rectification column packing is 40cm (20 trays), the height of the rectification section is 12cm (6 trays), the height of the stripping section is 28...

Embodiment 2

[0045] Take the wastewater from a methyl methacrylate plant in a domestic factory.

[0046] Extractant preparation: its components include: n-hexane, cyclohexane, octanol. The mass ratio of each component is: n-hexane:cyclohexane:octanol=95:3:2. Mix n-hexane, cyclohexane and octanol according to the proportion and stir evenly to prepare the extractant.

[0047] The extraction process is as follows: the extraction quality of extractant and wastewater is 1:10, the extraction temperature is 298K, the stirring speed is 40r / min, the stirring time is 15min, and the standing time is 30min.

[0048] Add alkali (sodium hydroxide) to the raffinate to adjust the pH to 7.0.

[0049] The rectification process is that the total height of the rectification column packing is 40cm (20 trays), the height of the rectification section is 12cm (6 trays), the height of the stripping section is 28cm (14 trays), and the temperature of the tower still 100°C, the temperature at the top of the tower is...

Embodiment 3

[0054] Take the wastewater from a methyl methacrylate plant in a domestic factory.

[0055] Extractant preparation: its components include: n-hexane, cyclohexane, octanol. The mass ratio of each component is: n-hexane:cyclohexane:octanol=97:2:1. Mix n-hexane, cyclohexane and octanol according to the proportion and stir evenly to prepare the extractant.

[0056] The extraction process is as follows: the extraction quality of extractant and wastewater is 1:10, the extraction temperature is 298K, the stirring speed is 40r / min, the stirring time is 15min, and the standing time is 30min.

[0057] Add alkali (sodium hydroxide) to the raffinate to adjust the pH to 7.0.

[0058] The rectification process is that the total height of the rectification column packing is 40cm (20 trays), the height of the rectification section is 12cm (6 trays), the height of the stripping section is 28cm (14 trays), and the temperature of the tower still 100°C, the temperature at the top of the tower ...

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Abstract

The invention provides a method for treating wastewater of a methyl methacrylate device. The method comprises the following steps: extracting methyl methacrylate from wastewater by adopting multiple extraction agents to obtain a first raffinate phase; adjusting the pH value of the first raffinate phase to be neutral to obtain a second raffinate phase; and rectifying the second raffinate phase to obtain treated wastewater. According to the method, on one hand, the problem that methyl methacrylate is polymerized when heated in the wastewater organic matter removal process in the prior art is solved, and on the other hand, the COD value of the treated wastewater is lower than 15000 mg / L, and the PH value is close to neutral, so that the biochemical treatment requirement is met.

Description

technical field [0001] The invention relates to the field of chemical wastewater treatment, in particular to a method for treating wastewater from a methyl methacrylate plant. Background technique [0002] The acetone cyanohydrin method (ACH method) produces methyl methacrylate, and the tail gas blower, refined stratifier, steam jet pump and other equipment in the device produce waste water during normal operation. The waste water has high COD value and strong acidity. According to chemical analysis, wastewater mainly contains organic substances such as methanol, acetone and methyl methacrylate, and the COD value is mainly contributed by these organic substances. Only by removing organic substances in wastewater can the COD value of wastewater be reduced. Methyl methacrylate contained in wastewater begins to polymerize when the temperature reaches 60°C under normal pressure and heating conditions. Due to the complex composition of wastewater and strong acidity, commonly used...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/34
CPCC02F9/00C02F1/04C02F1/26C02F1/66C02F2101/34
Inventor 方键李云龙刘长清王旭饶辉凯于鸿涛徐宏
Owner PETROCHINA CO LTD
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