Absorption distillation method for using adsorption resin to treat waste water containing dimethyl formamide

A technology of dimethylformamide and adsorption resin, which is applied in the field of dimethylformamide wastewater treatment, can solve the problems of rectification and separation energy consumption reduction, energy consumption reduction, large energy consumption, etc., and achieve a reduction in the amount of desorbent , The latent heat of vaporization is small, and the effect of reducing energy consumption

Inactive Publication Date: 2013-07-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present in my country's factories, the method of ordinary rectification is mainly used to reclaim DMF. This process consumes a lot of energy and the recovery cost is high; so many researchers have done a lot of work on the energy-saving aspect of the DMF recovery process. Typical examples include: Pressure rectification or multi-tower operation to reduce energy consumption, among which the double-tower energy-saving process can save energy by about 35% compared with single-tower rectification; (2) The method of combining extraction and rectification to recover DMF can save energy by about 60%.
Although these two processes have good energy-saving effects, both of them have their shortcomings. The vacuum distillation or multi-column distillation process still needs to evaporate a large amount of water and cannot fundamentally reduce energy consumption. However, although the extractant with low boiling point and low latent heat of vaporization is used in the extraction-distillation process, a large amount of extractant is required to ensure the extraction effect, which makes the energy consumption of the rectification separation still have room for reduction. The extraction waste liquid after extraction needs to be further treated, which is likely to cause secondary pollution

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  • Absorption distillation method for using adsorption resin to treat waste water containing dimethyl formamide
  • Absorption distillation method for using adsorption resin to treat waste water containing dimethyl formamide

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Embodiment approach

[0015] The present invention has two kinds of specific implementation methods, which are explained below in conjunction with the accompanying drawings:

[0016] Specific implementation method one

[0017] (1) Add the wastewater containing dimethylformamide DMF into the intermittent stirring tank R101, and conduct mass transfer with the macroporous adsorption resin in the stirring tank at normal temperature and pressure, so that the dimethylformamide DMF in the wastewater is adsorbed on the resin superior;

[0018] (2) Separating the adsorbed resin and waste water through the settling tank V102 for solid-liquid separation. After the solid-liquid separation, the resin adsorbed with dimethylformamide DMF is recovered and re-enters the batch stirring tank for desorption;

[0019] (3) Add a desorbent from the desorbent input pipeline PL2 to the intermittent stirring tank for desorption, obtain a mixed solution of dimethylformamide DMF and a desorbent, and store the mixed solution ...

Embodiment 1

[0031] Add various types of resins (including C series, D series, H series, NKA series, DA series, DK series, XAD series, AB-8 type), bentonite, chitosan, coal-based activated carbon, fruit shell activated carbon, and fiber activated carbon are adsorbed at 30°C and 1atm. After 2 hours of adsorption, the DMF concentration of H series, NKA series, D series, and AB-8 macroporous adsorption resins can be reduced to less than 0.1%, which has a good adsorption effect; while other types of resins, bentonite , chitosan, coal activated carbon, shell activated carbon and fiber activated carbon have no obvious adsorption effect.

Embodiment 2

[0033] The dimethylformamide wastewater with a mass concentration of 20% is adsorbed with the macroporous adsorption resin NKA-II in a batch stirring tank under the conditions of 1atm and 30°C, and the mass concentration of DMF in the waste liquid after adsorption for 3.5 hours is <0.05% , the resin adsorbed with DMF was drained and desorbed for 2 hours with ethanol twice the volume of waste water under the same conditions, and the mass concentration of DMF in the eluent was 9.58%. The eluent enters the rectifying tower from the 8th tray on the top of the tower, the rectifying tower pressure is 1atm, the total plate number of the rectifying tower is 45, the operating reflux ratio is 1, and the ethanol mass concentration of the tower top production liquid is 94.9%, recovery and recycling, the mass concentration of DMF at the bottom of the tower is 99.8%, and the total recovery rate of DMF can reach 96.2%.

[0034] Under the same conditions, the energy consumption of the extract...

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Abstract

The invention provides an absorption distillation method for using adsorption resin to treat waste water containing dimethyl formamide, belonging to the technical field of treatment of waste water containing dimethyl formamide, and solving the defects of the multi-column distillation and extraction-distillation process in prior art. The absorption distillation method for using adsorption resin totreat the waste water containing dimethyl formamide comprises the steps of using macroporous absorption resin to absorb before distillation of the waste water containing dimethyl formamide, using desorption agent to desorbing the resin, getting the mixed liquid of dimethyl formamide DMF and the desorption agent, delivering the mixed liquid into a rectifying column to implement normal pressure separation or reduced pressure separation, and getting the distillated dimethyl formamide DMF from the bottom of the rectifying column. Compared with the prior art of DMF waste water energy-saving recovery, the invention further reduces DMF recovering energy consumption without causing secondary pollution under the condition of ensuring high DMF recovery ratio, and has good practicality and economic performance.

Description

technical field [0001] The invention belongs to the technical field of dimethylformamide wastewater treatment, and more specifically relates to an adsorption rectification method for treating dimethylformamide wastewater with an adsorption resin. Background technique [0002] N, N-dimethylformamide is a colorless, transparent and stable chemical solvent, which can be miscible with various organic compounds such as water, alcohol, ether, ester, etc., also known as "universal solvent"; it is widely used in the synthesis of polyurethane Leather industry and pharmaceutical, chemical, petroleum, pesticide and other industries. Because DMF is used as a solvent in large quantities in tanning production, the discharged wastewater contains DMF, and DMF has low toxicity to the human body. Therefore, how to effectively and energy-savingly recover DMF from N,N-dimethylformamide wastewater is of great importance to reduce production costs. And energy consumption, protecting the environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/03C07C231/24C02F1/28
Inventor 叶长燊林诚付杰
Owner FUZHOU UNIV
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