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Method for treating wastewater of methyl methacrylate device

A technology of methyl methacrylate and treatment method, which is applied in the field of wastewater treatment of methyl methacrylate plant, can solve the problems such as the easy polymerization of methyl methacrylate, and achieve the effect of solving easy polymerization and inhibiting polymerization

Active Publication Date: 2020-08-21
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 treatment method for wastewater from a methyl methacrylate plant, to solve the problem that methyl methacrylate contained in wastewater is easily polymerized during the heating process, so that the treated wastewater can meet the requirements of biochemical 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
Comparison scheme
Effect test

Embodiment 1

[0031] Take the wastewater from a methyl methacrylate plant in a domestic factory, and adjust the pH value of the methyl methacrylate wastewater to 10 by adding alkali.

[0032] The rectification process is that the total height of the rectification tower packing is 52cm (26 trays), the height of the rectification section is 12cm (6 trays), the height of the stripping section is 40cm (20 trays), and the temperature of the tower still 101°C, tower top temperature 72°C, reflux ratio 4:1, operating pressure at normal pressure, continuous sampling 10 times to analyze the COD value and PH value of the wastewater, the results are shown in Table 1.

[0033] Table 1 Wastewater COD, PH and appearance

[0034]

[0035] The data in Table 1 shows that the treated wastewater was continuously sampled 10 times, the average COD was 14,500, the average pH was 6.86, and the appearance of the wastewater was clear and transparent, which met the requirements of the biochemical treatment of the ...

Embodiment 2

[0037] Take the wastewater from a methyl methacrylate plant in a domestic factory, and adjust the pH value of the methyl methacrylate wastewater to 9.7 by adding alkali.

[0038] The rectification process is that the total height of the rectification tower packing is 52cm (26 trays), the height of the rectification section is 12cm (6 trays), the height of the stripping section is 40cm (20 trays), and the temperature of the tower still 101°C, tower top temperature 72°C, reflux ratio 4:1, operating pressure at normal pressure, continuous sampling 10 times to analyze the COD value and PH value of the wastewater, the results are shown in Table 2.

[0039] Table 2 Wastewater COD, PH and appearance

[0040]

[0041] The data in Table 2 shows that the treated wastewater was continuously sampled 10 times, the average COD was 12920, the average pH was 6.46, the wastewater was slightly muddy with trace suspended solids, which basically met the requirements of the biochemical treatmen...

Embodiment 3

[0043] The pH value of methyl methacrylate wastewater was adjusted to 10.3 by adding alkali.

[0044] The rectification process is that the total height of the rectification tower packing is 52cm (26 trays), the height of the rectification section is 12cm (6 trays), the height of the stripping section is 40cm (20 trays), and the temperature of the tower still 101°C, tower top temperature 72°C, reflux ratio 4:1, operating pressure at normal pressure, continuous sampling 10 times to analyze the COD value and PH value of the wastewater, the results are shown in Table 3.

[0045] Table 3 Wastewater COD, PH and appearance

[0046]

[0047] The data in Table 3 shows that the treated wastewater was continuously sampled 10 times, the average COD was 18200, the average pH was 6.98, and the appearance of the wastewater was clear and transparent. However, because the average COD of the wastewater was close to 20000 mg / L, there were process fluctuations that caused the COD to exceed 20...

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Abstract

The invention provides a method for treating wastewater of a methyl methacrylate device. The treatment method comprises the following steps: adjusting the pH value of the wastewater of the methyl methacrylate device to 9.7-10.3 by adopting alkali; and introducing the methyl methacrylate device wastewater of which the pH value is adjusted into a rectifying tower for rectification so as to remove methyl methacrylate in the wastewater. Through the treatment method provided by the invention, the problem that methyl methacrylate contained in the wastewater is easy to polymerize in the heating process can be effectively solved, and the treated wastewater meets the biochemical treatment requirements.

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 its exhaust blower, refined stratifier, steam jet pump and other equipment produce wastewater during normal operation. The wastewater has a high COD value and strong acidity. Through 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 methyl methacrylat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/36C02F101/34
CPCC02F1/66C02F1/04C02F2101/34C02F2103/36
Inventor 方键李文博李云龙金冬梅张子轩饶辉凯徐桐
Owner PETROCHINA CO LTD
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