Method for producing high-purity triethylene glycol
A technology of triethylene glycol and its production method, which is applied in ether separation/purification, ether preparation, organic chemistry, etc., and can solve problems such as poor product quality
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Embodiment 1
[0020] A kind of production method of high-purity triethylene glycol, such as figure 1 Shown, thick triethylene glycol solution (the mass content of triethylene glycol is 92%) enters molecular still I, separates the heavy component wherein, and the triethylene glycol distillate I of distillation is as molecular still II The feed of molecular still I, molecular still II are connected with vacuum device, and the heavy component that molecular still I separates and the light component that molecular still II separates mixes and forms polyethylene glycol mixed liquor; Molecular distillation The triethylene glycol distillate II of the device II is cooled to 30° C. by the product condenser and then enters the post-processing unit; the post-processing unit includes a decolorization tank and a dealdehyde tank.
[0021] The operating conditions of molecular still I are: operating temperature 80°C, operating absolute pressure 50Pa; operating conditions of molecular still II are: operati...
Embodiment 2
[0023] A kind of production method of high-purity triethylene glycol, such as figure 1 Shown, thick triethylene glycol solution (the mass content of triethylene glycol is 85%) enters molecular still I, separates the heavy component wherein, and the triethylene glycol distillate I of distillation is as molecular still II The feed of molecular still I, molecular still II are connected with vacuum device, and the heavy component that molecular still I separates and the light component that molecular still II separates mixes and forms polyethylene glycol mixed liquor; Molecular distillation The triethylene glycol distillate II of the reactor II is cooled to 25° C. by the product condenser and then enters the post-processing unit; the post-processing unit includes a decolorization tank and a dealdehyde tank.
[0024] The operating conditions of molecular still I are: operating temperature 60°C, operating absolute pressure 50Pa; operating conditions of molecular still II are: operat...
Embodiment 3
[0027] A kind of production method of high-purity triethylene glycol, such as figure 1 Shown, thick triethylene glycol solution (mass content of triethylene glycol is 95%) enters molecular still I, separates heavy component wherein, and the triethylene glycol distillate I of distillation is as molecular still II The feed of molecular still I, molecular still II are connected with vacuum device, and the heavy component that molecular still I separates and the light component that molecular still II separates mixes and forms polyethylene glycol mixed liquor; Molecular distillation The triethylene glycol distillate II of the reactor II is cooled to 35° C. by the product condenser and then enters the post-processing unit; the post-processing unit includes a decolorization tank and a dealdehyde tank.
[0028] The operating conditions of molecular still I are: operating temperature 80°C, operating absolute pressure 100Pa; operating conditions of molecular still II are: operating abs...
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