Coating waste solvent recovery technology
A waste solvent and process technology, which is applied in the field of painting waste solvent recovery process, can solve the problems of difficult recovery, waste of valuable solvent resources, increased difficulty of hazardous waste incineration and difficulty of incineration tail gas treatment, etc.
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[0039] Recycling process see figure 1 ,in
[0040] P1-feed pump; P2-dehydrogenation reflux pump; P3-dehydrogenation discharge pump; P4-toluene reflux pump; P5-discharge pump; P6-butyl ester reflux pump; P7-xylene discharge pump; T1- Extraction tower; T2-light removal tower; T3-toluene tower; T4-xylene tower; E1-evaporator; E2-preheater; E3-dehydrogenation reboiler; E4-dehydrogenation condenser; E5-dehydrogenation Cooler; E6-Toluene Reboiler; E7-Toluene Condenser; E8-Xylene Reboiler; E9-Xylene Condenser; E10-Xylene Cooler; V1-Light Component Reflux Tank; V2-Toluene Reflux Tank; V3-Butyl Reflux Tank.
[0041] The specific operation steps are as follows:
[0042] (1) Extraction
[0043] Use desalted water as the extractant to extract ethanol, isopropanol, water and water-soluble resin from the waste coating solvent. Through actual operation, the volume flow ratio of desalted water to the waste coating solvent is controlled at 1:4 .
[0044] (2) Removal of impurities
[004...
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