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Method for simultaneously recycling sulfuric acid and organic substances in m-cresol production wastewater

A technology for the production of wastewater and organic matter, applied in the preparation of organic compounds, organic chemistry, natural water treatment, etc., can solve the problem of effective separation and recovery of acid, organic matter, salt, etc., to achieve small footprint, stable operation, and reduce pollution. Effect

Inactive Publication Date: 2013-03-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Aiming at the problem that the existing technology cannot realize the simultaneous recovery of inorganic and organic resources in wastewater while realizing rapid and effective separation of acid, organic matter and salt, the present invention provides a simultaneous resource treatment of sulfuric acid and organic matter in m-cresol production wastewater The method, which can realize the rapid and effective separation of acid, organic matter and salt in the high-acid saline wastewater discharged from the process of preparing m-cresol by diazotization-hydrolysis method, and return the high-concentration acid containing organic matter to the production process In order to realize the recycling of organic matter and inorganic acid while solving environmental problems, and realize the unity of economic benefits, environmental benefits and social benefits

Method used

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  • Method for simultaneously recycling sulfuric acid and organic substances in m-cresol production wastewater
  • Method for simultaneously recycling sulfuric acid and organic substances in m-cresol production wastewater
  • Method for simultaneously recycling sulfuric acid and organic substances in m-cresol production wastewater

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Embodiment 1

[0036] A method for simultaneous resource recovery of sulfuric acid and organic matter in m-cresol production wastewater, the steps of which are:

[0037] A) The m-cresol production wastewater was filtered to remove suspended solids; the m-cresol production wastewater to be treated was taken from a chemical plant in Huaian, Jiangsu, and the water quality components are shown in Table 2 below.

[0038] Table 2 Example 1 intermediate cresol production wastewater water quality

[0039]

[0040] B) The m-cresol production wastewater that is filtered to remove suspended matter is pumped into the resin column filled with anion exchange resin with a peristaltic pump at a flow rate of 3BV / h at 20°C; through this step, sulfuric acid and most of the organic matter are adsorbed to On the resin column, sodium salt and a small part of organic matter flow out with the effluent.

[0041] C) After the resin adsorption in the resin column is saturated, stop pumping into the m-cresol prod...

Embodiment 2

[0049] The waste water quality and basic steps that the present embodiment handles are the same as embodiment 1, and difference is: the flow velocity of pumping into m-cresol production wastewater in step B) and the flow velocity of adding regeneration agent in step D) all increase to 15BV / h, the results show that the increase of the flow rate has no significant effect on the adsorption capacity and regeneration effect, but only reduces the processing time of a batch. The flow rate is increased by four times, and the processing time becomes one-fifth of the original. The separation and regeneration effect of this step is shown in Table 4.

[0050] Table 4 Separation acid regeneration index

[0051]

[0052] Similarly, the flow rate of pumping m-cresol production wastewater in step B) and the flow rate of adding regenerant in step D) are all increased to 30BV / h, which has no significant impact on adsorption capacity and regeneration effect, and the treatment time is short...

Embodiment 3

[0054] The water quality and basic steps of the wastewater treated in this example are the same as in Example 1, the difference is that: the production wastewater in step B) is pumped into the resin column at 5°C, and the volume of each batch is 0.5BV; step C) will effluent The pH of the pH reaches 2 as the critical point of resin adsorption saturation, that is, when the pH of the effluent reaches 2, stop pumping m-cresol wastewater; the volume of the regeneration solution in step D) is 0.25BV, and the dividing line between the front section and the middle section is 0.1BV , the dividing line between the middle segment and the posterior segment is 0.2 BV. The adsorption capacity is reduced, and the acid recovery rate and metal ion recovery rate are both increased. The separation regeneration effect of this step is shown in Table 5.

[0055] Table 5 Separation acid regeneration index (treatment volume 0.5BV)

[0056]

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Abstract

The invention discloses a method for simultaneously recycling sulfuric acid and organic substances in m-cresol production wastewater, belonging to the field of wastewater treatment in organic chemical engineering. The method comprises the following steps: A) filtering m-cresol production wastewater to remove suspended substances; B) pumping he filtered m-cresol production wastewater without suspended substances into a resin column filled with resin; C) after the adsorption of the resin in the resin column is saturated, stopping pumping in the m-cresol production wastewater, and discharging the solution left in the resin gap by using an air compressor; and D) charging clear water or dilute regeneration solution as a regenerator into the resin column to regenerate the substances adsorbed by the resin, thereby forming the regeneration solution. The invention can quickly and effectively separate acids and organic substances from salts in high-acid brine wastewater discharged in the m-cresol preparation process by diazotization-hydrolysis, and implements recycling of the organic substances and inorganic acids while solving the environmental problem, thereby implementing unification of economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention belongs to the field of organic chemical wastewater treatment, and in particular relates to a recycling treatment technology for organic intermediate production wastewater, and more specifically, relates to a method for simultaneously recycling sulfuric acid and organics in m-cresol production wastewater. Background technique [0002] m-cresol is an important intermediate in the manufacture of dyes, medicines, pesticides, spices, etc. According to statistics, the demand for m-cresol will maintain an average annual growth rate of about 8% to 10%. The current output cannot meet the demand of the domestic market, and a considerable amount of m-cresol needs to be imported every year. [0003] Since the production of m-cresol by diazotization-hydrolysis has a series of advantages such as mild process conditions, single product structure, no isomers and easy operation, it has become the mainstream method of m-cresol production in China. In the...

Claims

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Application Information

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IPC IPC(8): C02F1/42C07C209/86C07C211/47C07C39/07C07C37/82C01B17/90C02F103/36
Inventor 刘福强孙晓文吴秋原陶学文凌晨李爱民白志平
Owner NANJING UNIV
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