Method and equipment for distillation and purification of low-concentration dmac in waste water containing a small amount of low-boilers and high-boilers
A low-boiling and high-boiling technology, applied in the field of distillation and purification of wastewater containing less dimethylacetamide (DMAc), can solve the problems of increased energy consumption, high operating temperature, secondary pollution, etc., and reduce energy consumption. , Avoid polluting the environment and reduce the effect of increasing impurities
Active Publication Date: 2016-06-08
WEIHAI WEIGAO BLOOD PURIFICATION PROD +1
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Problems solved by technology
The high waste water treatment fee makes the enterprises that are already in vicious competition with meager profits worse
The DMAc purification method disclosed in the Chinese patent (publication number: 102030672A) is used to recover ultra-high-purity DMAc solvents in the spandex production process. However, its scope of application is limited to wastewater with a DMAc concentration of 20% to 70%. For DMAc Wastewater with a concentration below 10%, it is difficult to obtain high-purity DMAc by this method
However, due to the high operating temperature of this method, energy consumption is increased, and DMAc is easily decomposed into small molecular substances such as acetic acid and dimethylamine, which increases the burden of deacidification of finished products and deamination of tower top water and easily causes secondary pollution
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[0023] A method for distillation and purification of low-concentration DMAc in waste water containing a small amount of low-boilers and high-boilers, characterized in that it comprises the following steps:
[0024] Step 1: Pump the waste water containing 2% DMAc, low boilers and high boilers into the primary concentration tower for primary concentration through the raw liquid pump. The bottom temperature of the primary concentration tower is controlled at 42°C-46°C, and the top temperature Control at 39°C-43°C;
[0025] Step 2: When the concentration of DMAc in the bottom liquid of the primary concentration tower increases by 0.4% (that is, reaches 2.4%), it is sent from the primary (T101) discharge pump to the secondary concentration tower for secondary concentration, and the secondary concentration tower The bottom temperature is controlled at 55°C-59°C, and the tower top temperature is controlled at 52°C-56°C;
[0026] Step 3: When the concentration of DMAc in the bottom l...
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A method and equipment for distillation and purification of low-concentration DMAc in wastewater containing a small amount of low-boilers and high-boilers, relating to a method and equipment for distillation and purification of wastewater containing less dimethylacetamide; including steps of decompression, low-temperature multi-stage concentration and Evaporation and distillation steps. The equipment includes: a first-stage concentration tower, a second-stage concentration tower, a third-stage concentration tower, an evaporation tank, a fourth-stage concentration tower, a rectification tower, and a deacidification tower. The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art, and to provide the advantages of low energy consumption, high recovery rate, less DMAc decomposition, no environmental pollution, less COD content in tower top water, energy saving and environmental protection.
Description
technical field [0001] The invention relates to a method for distilling and purifying waste water containing less dimethylacetamide (DMAc); in detail, it is a method of high energy utilization rate, energy saving, less DMAc decomposition, and avoiding sewage pollution containing a small amount of low boiling matter and high boiling point A method and equipment for distillation and purification of low-concentration DMAc in waste water of boiling substances. Background technique [0002] With the shortage and pollution of China's water resources, membrane water treatment technology is more and more widely used in multiple water treatment fields such as municipal water and enterprise sewage. As the core and consumables of membrane water treatment technology, hollow fiber membranes have seen rapid growth in demand. DMAc is mainly used as a solvent in the hollow fiber membrane manufacturing process, such as a polymer solvent in synthetic fiber spinning, or as a polymer solvent i...
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IPC IPC(8): C07C231/24C07C233/05
Inventor 章旭元牟倡骏何红星王霁徐天成王德洋王洪浩
Owner WEIHAI WEIGAO BLOOD PURIFICATION PROD