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Method for treating wastes generated in the synthetic processes of methylamine and dimethyl formamide

A technology of dimethylformamide and synthesis process is applied in the field of processing waste generated in the synthesis process of methylamine and dimethylformamide, and can solve the problem of greatly different treatment effects, large investment in biochemical treatment, waste of land resources, etc. problems, to achieve the effect of saving circulating cooling water, increasing PH value, and reducing ash melting point

Active Publication Date: 2012-10-03
ANHUI HUAIHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. The investment in biochemical treatment is large. When the composition and flow of wastewater change, the treatment effect varies greatly, and pollution accidents may occur;
[0005] 2. Use filtration and landfill methods to treat residues. The filtered residues will cause secondary pollution during the process of cleaning and loading. Landfilling is an even more backward treatment method, which wastes valuable land resources and will also cause damage to water sources. Pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1, the amount of solid residue produced in the filter used in the synthesis process of Anhui Huaihua Co., Ltd. dimethylformamide per day is 2 tons, and the waste water produced in the methylamine rectification process of Anhui Huaihua Co., Ltd. is about 800 tons per day. 2 tons of solid residue in the used filter in the 800 tons of waste water dissolving dimethylformamide synthetic process that produces in the rectification process with methylamine, the concentration of sodium carbonate in the liquid of gained is 0.2%, COD value (Chemical Oxygen Demand, Chemical oxygen demand) 5474mg / L, PH value at 10.5;

[0022] Step 2, stirring 802 tons of waste water obtained in step 1, 1203 tons of coal powder with an average particle size of 30 to 60 μm, and 1.1 tons of lignin for 1 hour, removing the part whose particle size is greater than 0.5 mm;

[0023] Step 3, burning the coal-water slurry obtained in step 2 as fuel, and condensing the obtained water vapor into water.

...

Embodiment 2

[0030] Step 1, the amount of solid residue produced in the filter used in the synthesis process of Anhui Huaihua Co., Ltd. dimethylformamide per day is 2 tons, and the waste water produced in the methylamine rectification process of Anhui Huaihua Co., Ltd. is about 800 tons per day. 2 tons of solid residue in the used filter in the 800 tons of waste water dissolving dimethylformamide synthetic process that produces in the rectification process with methylamine, the concentration of sodium carbonate in the liquid of gained is 0.2%, COD value (Chemical Oxygen Demand, Chemical oxygen demand) 5480mg / L, PH value at 10.4;

[0031] Step 2, 802 tons of waste water obtained in step 1, 1604 tons of coal powder and 12 tons of lignin with an average particle size of 30 to 60 μm were stirred for 1 hour, and the particle size was removed greater than the part greater than 0.5 mm;

[0032] Step 3, burning the coal-water slurry obtained in step 2 as fuel, and condensing the obtained water vap...

Embodiment 3

[0034] Step 1, the amount of solid residue produced in the filter used in the synthesis process of Anhui Huaihua Co., Ltd. dimethylformamide per day is 2 tons, and the waste water produced in the methylamine rectification process of Anhui Huaihua Co., Ltd. is about 800 tons per day. 2 tons of solid residue in the used filter in the 800 tons of waste water dissolving dimethylformamide synthetic process that produces in the rectification process with methylamine, the concentration of sodium carbonate in the liquid of gained is 0.2%, COD value (Chemical Oxygen Demand, Chemical oxygen demand) 5470mg / L, PH value at 10.6;

[0035] Step 2, stirring 802 tons of waste water obtained in step 1, 1500 tons of coal powder with an average particle size of 30 to 60 μm and 5.8 tons of lignin for 1 hour, removing the part whose particle size is greater than 0.5 mm;

[0036] Step 3, burning the coal-water slurry obtained in step 2 as fuel, and condensing the obtained water vapor into water.

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Abstract

A method for treating wastes generated in the synthetic processes of methylamine and dimethyl formamide comprises the following steps: (1) firstly using the waste water generated in the synthetic process of methylamine to dissolve the solid residues filtered in the synthetic process of dimethyl formamide; (2) mixing the liquid obtained in the step (1) with coal dust to prepare coal water slurry; and (3) burning the coal water slurry obtained in the (2) as fuel and condensing the obtained water vapor to water. The method has the following advantages: the solid residues filtered in the synthetic process of dimethyl formamide are sodium salts, mainly sodium carbonate, thus being extremely easy to be soluble in water, and can be directly transmitted to the destination via the pipeline, thus avoiding secondary pollution.

Description

technical field [0001] The invention relates to a method for treating chemical waste, in particular to a method for treating waste produced in the synthesis process of methylamine and dimethylformamide. Background technique [0002] The waste produced in the synthetic process of methylamine and dimethylformamide includes: methylamine waste water and the residue in the filter of dimethylformamide, the old method of the treatment of two kinds of wastes at present, mainly use biochemical method to treat waste water; Dispose of residues by filtration and landfill. [0003] Disadvantages of the current approach: [0004] 1. The investment in biochemical treatment is large. When the composition and flow of wastewater change, the treatment effect varies greatly, and pollution accidents may occur; [0005] 2. Use filtration and landfill methods to treat residues. The filtered residues will cause secondary pollution during the process of cleaning and loading. Landfilling is an even...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/38A62D101/26
Inventor 马宁
Owner ANHUI HUAIHUA
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