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Method for recycling N-methylformamide and diethylene glycol monomethyl ether in paint remover waste liquid

A technology of methyl formamide and diethylene glycol, which is applied in the field of recycling N-methyl formamide and diethylene glycol monomethyl ether in paint remover waste liquid, to save energy consumption, save equipment investment, and reduce energy consumption. The effect of consumption and equipment investment

Pending Publication Date: 2019-02-12
FUQING BRANCH OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no report on the recovery of N-methylformamide and diethylene glycol monomethyl ether in the paint stripper waste liquid by using the extractive dividing column

Method used

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  • Method for recycling N-methylformamide and diethylene glycol monomethyl ether in paint remover waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0033] according to figure 1 Shown: The extraction partition distillation tower 4 is a packed tower with a tower diameter of 60mm. The tower body and packing are made of 304 stainless steel. The packing type is φ3mm×3mm θ ring packing. The tower height is 5m. The number of theoretical plates in the rectification section of sub-column 2 is 25, the number of theoretical plates in common stripping section 3 is 26, and the cross-sectional area ratio between the stripping section of sub-column 2 and the rectification section of main column 1 is 0.5. N-methylformamide refining tower 5 is a packed tower with a tower diameter of 40mm. The tower body and packing are made of 304 stainless steel. The packing type is φ3mm×3mm θ ring packing. The tower height is 3m. The number of theoretical plates in the rectification section is 12, and the number of theoretical plates in the stripping section is 20. N-methylformamide demetallization tower 6 is a packed tower with a tower diameter of 20m...

Embodiment 2

[0037] The extraction partition distillation column 4 is a packed column with a tower diameter of 60 mm. The tower body and packing are made of 304 stainless steel. The packing type is φ3mm×3mm θ ring packing. The tower height is 5m. The number of theoretical plates in the rectifying section is 25, the number of theoretical plates in the common stripping section 3 is 26, and the cross-sectional area ratio of the stripping section of the sub-column 2 to the rectifying section of the main column 1 is 0.5. N-methylformamide refining tower 5 is a packed tower with a tower diameter of 40mm. The tower body and packing are made of 304 stainless steel. The packing type is φ3mm×3mm θ ring packing. The tower height is 3m. The number of theoretical plates in the rectification section is 12, and the number of theoretical plates in the stripping section is 20. N-methylformamide demetallization tower 6 is a packed tower with a tower diameter of 20mm. The tower body and packing are made of 3...

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Abstract

The invention relates to the field of solvent recycling, in particular to a method for recycling N-methylformamide and diethylene glycol monomethyl ether in paint remover waste liquid. The method adopts an extraction dividing-wall rectifying method to recycle N-methylformamide and diethylene glycol monomethyl ether in paint remover waste liquid; the paint remover waste liquid is rectified and separated through a main tower and an auxiliary tower of an extraction dividing-wall rectifying tower, and N-methylformamide crude product and diethylene glycol monomethyl ether crude product are obtainedrespectively; the N-methylformamide crude product passes through a N-methylformamide refining tower and a metal removing tower to obtain N-methylformamide, and the diethylene glycol monomethyl ethercrude product passes through a diethylene glycol monomethyl ether refining tower and the metal removing tower to obtain diethylene glycol monomethyl ether. The method can be adopted to conduct continuous production; the separation of the N-methylformamide and the diethylene glycol monomethyl ether is achieved; the method has the advantages that the purity of separated products is high; the technological procedure is simple; energy consumption and equipment investment in the separation process can be effectively lowered at the same time.

Description

technical field [0001] The invention belongs to the field of solvent recovery, in particular to a method for recovering N-methylformamide and diethylene glycol monomethyl ether in paint stripper waste liquid. Background technique [0002] The paint remover is a mixed liquid prepared from a high-solvent solvent, which has a strong ability to dissolve paint films, and can be used in various paints such as alkyd, nitro, epoxy, polyester, polyurethane, and powder coatings. , Removal of exterior wall coatings, etc. [0003] The main components of traditional paint removers are chlorinated alkanes and benzene compounds. Although they can efficiently remove the paint film on the substrate, due to their high toxicity and high pollution, they will pollute the environment and cause bodily harm to operators. In recent years, a variety of new, low-pollution and environmentally-friendly paint removers have been developed, among which diethylene glycol monomethyl ether with low toxicity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/03C07C41/42C07C43/13
CPCC07C41/42C07C231/24C07C233/03C07C43/135
Inventor 杨金杯陈文韬王昌伟余美琼
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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