Process and device for treating dimethylformamide production wastewater and recycling substances

A technology for dimethylformamide and waste water production, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of high salt content in waste water, reduce pollution, and facilitate mass production Collect and ensure the effect of safe operation

Pending Publication Date: 2019-06-28
LUXI CHEM GRP
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Problems solved by technology

However, in the process of producing DMF by this method, the catalyst sodium methoxide is easy to react with the impurity water, oxygen and carbon dioxide brought in the raw materials to form sodium formate and sodium carbonate crystals, resulting in extremely high salt content in the waste water
At present, there is no report on recycling the high-salt wastewater produced in the process of producing DMF by the carbon monoxide method

Method used

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  • Process and device for treating dimethylformamide production wastewater and recycling substances
  • Process and device for treating dimethylformamide production wastewater and recycling substances

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Embodiment 1

[0047] Embodiment 1 A kind of technology of dimethylformamide production wastewater treatment and material recovery

[0048] The technology of described dimethyl formamide production waste water treatment and material recovery, comprises the following steps:

[0049] Use low-pressure steam to heat and evaporate the high-salt wastewater produced by the preparation of dimethylformamide, and condense the evaporated water vapor to obtain desalted wastewater, which is then recycled; the remaining solid salt mud after evaporation is collected for sodium formate extract.

[0050] The extraction method of sodium formate in the remaining solid salt mud after evaporation is:

[0051] (1) Stir and dissolve the collected solid salt mud to obtain a mixed solution;

[0052] (2) Filter the mixed solution of step (1), and collect the filtrate;

[0053] (3) adding hydrogen peroxide to the filtrate collected in step (2) for oxidation, adding activated carbon after oxidation for adsorption de...

Embodiment 2 2

[0056] Embodiment 2 The device of dimethylformamide production wastewater treatment and material recovery

[0057] Such as figure 2 As shown, the high-salt wastewater desalination treatment device includes a vacuum dryer 7, a condenser 9, a first condensation water tank 15, a second condensation water tank 16, a collection water tank 10, a vacuum tank 11, a separation tank 8, a vacuum pump 12, a collection Water pump 17, loading pump 18, first vacuum condenser 13, second vacuum condenser 14, PLC control system and LLC automatic input system.

[0058] The feed port of the vacuum dryer 7 is connected to the sewage collection tank, the outlet is connected to the material inlet of the separation tank 8, the material outlet of the separation tank 8 is connected to the inlet of the condenser 9; the outlet of the condenser 9 is connected to the inlet of the collecting water tank 10 , the collection water tank 10 is connected with the first condensed water tank 15 through the collec...

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Abstract

The invention belongs to the technical field of chemical industry production and particularly relates to a process and device for treating dimethylformamide production wastewater and recycling substances. The process comprises the following steps: heating to evaporate high salinity wastewater produced during the preparation of dimethylformamide through low-pressure steam, condensing the evaporatedwater steam so as to obtain desalted wastewater, and carrying out cyclic utilization; collecting solid salt mud remained after the evaporation, and extracting sodium formate. According to the process, the high salinity wastewater produced during the production of DMF can be effectively desalted and recycled; the salt content of the wastewater is decreased from 600000mg / L to 2000mg / L, and the problem of treatment of the high salinity wastewater is solved. According to the device, the utilization efficiency of water is increased, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a process and device for treating waste water from dimethylformamide production and recovering substances. Background technique [0002] Dimethylformamide (DMF) is a good solvent for many organic and inorganic substances, so it is often used as a reaction catalyst or co-catalyst in the reaction to increase the yield of reaction products and reduce the formation rate of by-products. The DMF production process uses anhydrous dimethylamine and CO as raw materials at a certain temperature and pressure, and uses sodium methoxide and methanol as a catalyst solvent for gas-liquid contact to complete the acylation reaction. [0003] The reaction is done in two steps: [0004] Step 1: CH 3 OH+CO→HCOOCH 3 [0005] Step 2: HCOOCH 3 +(CH 3 ) 2 NH→HCON(CH 3 ) 2 +CH 3 Oh [0006] The total reaction formula: CO+(CH 3 ) 2 NH→HCON(CH 3 ) 2 [0007] The firs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C51/285C07C53/06C02F11/00
Inventor 朱敬伟王存申王德民李玉超
Owner LUXI CHEM GRP
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