Method for performing comprehensive treatment by utilizing waste water from production of ternary monomer

Abstract

The invention relates to a method for performing comprehensive treatment by utilizing waste water from the production of a ternary monomer. A corresponding production line is arranged, and the method comprises the following process steps: a distillation and dealcoholization process (I), an extraction process (II), a back extraction process (III), a concentration and dehydration process (IV), a hot melting and fine filtration process (V), a dehydration and crystallization process (VI) and a preparation and drying process (VII), wherein a alcohol acid mixed solvent (6) is added in the extraction process (II); liquid alkali (11) and purified water (12) are added in the back extraction process (III); sulfuric acid (17), activated carbon (18) and the purified water (12) are added in the hot melting and fine filtration process (V); and an m-phthalic acid-5-sodium sulfonate finished product (25) is finally prepared under the process conditions of corresponding temperature, water and time of each of all the processes, and the m-phthalic acid-5-sodium sulfonate finished product (25) is used for preparing ammonium-free waterborne polyester resin and waterborne polyurethane, is also a monomer of the polyester resin for synthesizing a bonding agent for food packaging. According to the method disclosed by the invention, the pollution of the waste water is solved, an environment is protected, the value is created, and the economic and social benefits are significant.

Description

technical field [0001] The invention relates to a subsequent treatment process for producing polyester chip additives, in particular to the treatment and utilization of three-monomer production wastewater. Background technique [0002] Trimonomer (dimethyl isophthalate-5-sodium sulfonate) is an additive used to make polyester chips. The waste water residue generated during the production process will pollute the land and the environment. At the same time, during the production Wastewater also contains 3-5% dimethyl isophthalate-5-sodium sulfonate residues. Although it has recycling value, it is difficult to completely recycle, it is difficult to extract cleanly, and the cost is high. The waste liquid produced after methanol extraction needs to extract the residue to meet the discharge requirements. However, due to economic reasons and technical difficulties, domestic production enterprises generally propose methanol and immediately discharge the production wastewater direct...

AI Technical Summary

Problems solved by technology

[0002] Trimonomer (dimethyl isophthalate-5-sodium sulfonate) is an additive used to make polyester chips. The waste water residue generated during the production process will pollute the land and the environment. At the same time, during the production Wastewater also contains 3-5% dimethyl isophthalate-5-sodium sulfonate residues. Although it has recycling value, it is difficult to completely recycle, it is difficult to extract cleanly, and the cost is high

For every 1 ton of dimethyl isophthalate-5-sodium sulfonate product, 4 tons of waste water need to be discharged. Based on an annual output of 2000 tons of dimethyl isophthalate-5-sodium sulfonate product, 8000 tons Wastewater is discharged into nature, causing serious pollution to the land and the environment

At the same time, the loss of residual effective substances also causes a certain loss

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