Synthetic leather industry waste water resource recycling process containing dmf
A synthetic leather and industry technology, applied in the field of recycling process of DMF-containing wastewater resources in the synthetic leather industry, can solve the problems of high energy consumption, heavy environmental cost, environmental burden, etc.
Inactive Publication Date: 2015-09-09
上海涅磐环保科技发展有限公司
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Problems solved by technology
[0003] The rapid development of the industry has brought high economic benefits, but also paid a heavy environmental price. Due to the backwardness of wastewater treatment technology, the industry has high energy consumption. In addition to some solvent and water recovery, the pollutants that must be discharged All belong to the type that is difficult to degrade in nature, and the industrial clusters have caused a lot of burden on the local environment
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[0020] Take 10 tons of raw water, after filtering, obtain about ten tons of filtrate B, obtain about 100 kg of solid A, collect solid A centrally, and process it after reaching a certain amount, filtrate B enters the freezing system, first pre-cooling and then quick-freezing until freezing, and filtering , separate the ice cubes and put them into the pre-cooling system of the filtrate B. The ice cubes melt into water and enter the production cycle; the obtained filtrate C is about 1500-2500 kg, and the dehydrating agent is added to the filtrate, and the dosage is 500-500 kg , add the dehydrating agent and stir for 30 minutes, filter to obtain a filtrate D of about 1200-2400 kg, dry the obtained dehydrating agent and recycle it.
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The invention discloses a recycling technology for DMF-containing wastewater resources in the synthetic leather industry. The technology comprises the following steps of: filtering raw water, collecting a filtrate B, then, cooling to low temperature by a pre-cooling procedure, performing a quick-freeze procedure until icing up, filtering out the ice, pre-cooling the obtained ice, and carrying out heat exchange between the ice and the filtrate B to be treated so as to lower the energy consumption of the whole flow, wherein when the ice melts into water, the water can be recycled as production water and an obtained filtrate C is a coarse DMF solvent containing trace amount of water; and adding a dehydrating agent to the filtrate C to dehydrate and dry the filtrate C to obtain a filtrate D, wherein the filtrate D obtained after filtration is an anhydrous DMF solvent, and the anhydrous DMF solvent can be used for wet leather-making production.
Description
technical field [0001] The present invention is aimed at the recycling wastewater produced in the wet production process of PU (polyurethane) synthetic leather, which has high solvent content, high recycling energy consumption, and simultaneously produces waste acids such as formic acid and dimethylamine, waste alkali pollutants, and solid residues that are difficult to handle. For practical problems, a brand-new process method for resource recycling is proposed, which not only realizes 100% recycling of wastewater resources, but also 100% recycling of high-boiling point solvents contained in wastewater without pyrolysis. Wastewater Other suspended solids in the tank can also be treated centrally after being collected, and the active ingredients in it can be recovered. Therefore, the present invention is a zero-emission environmental protection process that is matched with the synthetic leather wet production process, and has no waste gas, waste water, and waste residue discha...
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IPC IPC(8): C02F9/08C08H7/00C01F11/18C02F1/22
Inventor 施冬梅
Owner 上海涅磐环保科技发展有限公司