Method for recovering N-methyl-2-pyrrolidone from polyurethane adhesive cleaning waste liquid
A technology of polyurethane adhesive and methylpyrrolidone, which is applied in the direction of organic chemistry, can solve the problem that N-methylpyrrolidone cannot be recycled and the cost can be recovered, and achieve the effect of high recovery rate and good cleaning ability
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Embodiment 1
[0028] Such as figure 1 Shown, the recovery method of N-methylpyrrolidone (NMP) may further comprise the steps:
[0029] (1) In 100 parts by weight of polyurethane hot-melt adhesive cleaning waste liquid (solid content: 25.5%), add 30 parts by weight of pure water dropwise while stirring, and the mixed solution adds up to 65 g to obtain a suspension containing particles and flocculent micelles solid-liquid mixture;
[0030] (2) The solid-liquid mixture is filtered to obtain 13.2g solid particle filter cake and 50.7g filtrate, and the solid particle is compressed and entrusted to a hazardous waste treatment station for processing;
[0031] (3) The filtrate is gradually heated up under a vacuum degree of -0.09MPa. The initial temperature is 65°C and the end temperature is 105°C. Distillation under reduced pressure is carried out, and the light components are collected after being condensed. base pyrrolidone.
[0032] The recovered N-methylpyrrolidone had a solid content of 5....
Embodiment 2
[0034] Such as figure 1 Shown, the recovery method of N-methylpyrrolidone (NMP) may further comprise the steps:
[0035] (1) In 100 parts by weight of polyurethane hot-melt adhesive cleaning waste liquid (solid content: 25.5%), add 40 parts by weight of pure water dropwise while stirring, and the mixed solution adds up to 70 g to obtain a suspension containing particles and flocculent micelles solid-liquid mixture;
[0036] (2) The solid-liquid mixture is filtered to obtain 12.7g solid particle filter cake and 54.9g filtrate, and the solid particle is compressed and entrusted to a hazardous waste treatment station for processing;
[0037] (3) The filtrate is gradually heated up under a vacuum degree of -0.07MPa. The initial temperature is 85°C and the end temperature is 115°C. Distillation under reduced pressure is carried out, and the light components are collected after being condensed. base pyrrolidone.
[0038] The recovered N-methylpyrrolidone had a solid content of 4....
Embodiment 3
[0040] Such as figure 1 Shown, the recovery method of N-methylpyrrolidone (NMP) may further comprise the steps:
[0041] (1) In 100 parts by weight of polyurethane hot-melt adhesive cleaning waste liquid (solid content: 25.5%), add 30 parts by weight of pure water dropwise while stirring, and the mixed solution adds up to 65 g to obtain a suspension containing particles and flocculent micelles solid-liquid mixture;
[0042] (2) The solid-liquid mixture is filtered to obtain 13.5g solid particle filter cake and 50.3g filtrate, and the solid particle is compressed and entrusted to a hazardous waste treatment station for processing;
[0043] (3) The filtrate is gradually heated up under a vacuum degree of -0.05MPa. The initial temperature is 95°C and the end temperature is 135°C. Distillation under reduced pressure is carried out, and the light components are collected after being condensed. base pyrrolidone.
[0044]The recovered N-methylpyrrolidone had a solid content of 5.5...
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