Method for processing production effluent of maleimide compound
The technology of a maleimide and a treatment method is applied in the field of treatment of maleimide compound production waste liquid, can solve the problems of wasting resources, polluting the environment, increasing the production cost of enterprises, saving resources and solving pollution , the effect of increasing production
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Embodiment 1
[0021] In this example, the production of N,N'-4,4'-diphenylmethane bismaleimide (BDM) is taken as an example, and acetone is used as the organic solvent during production, and the treatment method of the production wastewater is as follows:
[0022] 1) The production waste water is subjected to vacuum distillation, the pressure is controlled at -0.05~-0.08MPa, and the solvent acetone is recovered. The recovered amount accounts for 15% of the total amount of acetone used in production, and the purity of acetone is 95wt%;
[0023] 2) Place the remaining production waste liquid after distillation in step 1) to age at 4°C for 20 days, take it out and filter to obtain the precipitate, and dry it;
[0024] 3) Add the dried precipitate obtained in step 2) into the dissolving agent dimethylformamide, stir, filter, and the insoluble matter is a small amount of viscous jelly, which contains maleic acid (anhydride), primary amine, incompletely condensed Maleamic acid, water, organic sol...
Embodiment 2
[0030] In this example, the production of N,N'-4,4'-diphenylmethane bismaleimide (BDM) is taken as an example, and acetone is used as the organic solvent during production, and the treatment method of the production wastewater is as follows:
[0031] 1) Control the pressure of vacuum distillation of the production waste water at -0.04~-0.07MPa, and recycle the solvent acetone. The recovered amount accounts for 14% of the total amount of acetone used in production, and the purity of acetone is 96wt%;
[0032] 2) Place the remaining production waste liquid after distillation in step 1) to age at 15°C for 30 days, take it out and filter to obtain the precipitate, and dry it;
[0033] 3) Add the dried precipitate obtained in step 2) into trimethylbenzene, an inter-dissolving agent, stir, filter, and the insoluble matter is a small amount of viscous jelly, which contains maleic acid (anhydride), primary amine, and incompletely condensed maleic acid. Amic acid, water, organic solven...
Embodiment 3
[0039] The present embodiment is an example with the production of N-4-anilinophenylmaleimide, and toluene is an organic solvent during production, and the processing method of its production waste water is as follows:
[0040] 1) Control the pressure of vacuum distillation of the production wastewater at -0.06~-0.08MPa, and recover the solvent toluene, which accounts for 18% of the total amount of toluene used in production, and the purity of toluene is 95wt%;
[0041] 2) Place the remaining production waste liquid after distillation in step 1) to age at 25°C for 10 days, take it out and filter to obtain the precipitate, and dry it;
[0042] 3) Add the dried precipitate obtained in step 2) into the dissolving agent xylene, stir, filter, and the insoluble matter is a small amount of viscous jelly, which contains maleic acid (anhydride), primary amine, incompletely condensed maleic acid Amic acid, water, organic solvents participating in the reaction, etc., the viscous jelly wa...
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