A kind of process method of recovering propylene glycol from propylene oxide waste water
A technology of propylene oxide and propylene glycol, which is applied in chemical instruments and methods, multi-stage water treatment, water/sewage multi-stage treatment, etc., can solve the problems of high treatment cost, waste of resources, etc. The effect of obvious environmental benefits
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Embodiment 1
[0016] In this embodiment, a process for recovering propylene glycol from propylene oxide wastewater is provided. The treated object is from the wastewater of a propylene oxide production company in Jiangxi Province. The raw water quality is as follows: COD 300,000mg / L, salt content 16%, pH value 14, propylene glycol content 5%. The treatment process is as follows.
[0017] Step S10. Take 800ml of the above waste water, add 74ml of hydrochloric acid to adjust the pH value of the waste water to 7, receive fraction 400ml and residual liquid after atmospheric distillation, after testing, the COD value of the fraction is 8489mg / L.
[0018] Step S20. After desalting the still residue obtained in step S10 by suction filtration, 114 g of filtrate and salt were obtained.
[0019] Step S30. The filtrate obtained in step S20 is subjected to vacuum distillation at a pressure of -0.095mpa and an external heating temperature of 200°C to obtain a fraction of 325ml at a gas phase temperatur...
Embodiment 2
[0022] In this embodiment, a process for recovering propylene glycol from propylene oxide wastewater is provided. Treatment object water quality is with embodiment 1. The treatment process is as follows.
[0023] Step S10. Take 800ml of the above waste water, add 34ml of hydrochloric acid to adjust the pH value of the waste water to 12, and receive 400ml of fraction and residual liquid after atmospheric distillation. After testing, the COD value of the fraction is 8489mg / L.
[0024] Step S20. After desalting the residue obtained in step S10 by suction filtration, 74 g of filtrate and salt were obtained;
[0025] Step S30. The filtrate obtained in step S20 is subjected to vacuum distillation at a pressure of -0.095mpa and an external heating temperature of 200°C to obtain a fraction of 350ml at a gas phase temperature of 20°C to 100°C (COD value is 32346mg / L ) and a fraction of 30ml at a gas phase temperature of 100°C to 120°C. After testing, the 1,2-propanediol content in t...
Embodiment 3
[0028] In this embodiment, a process for recovering propylene glycol from propylene oxide wastewater is provided. Treatment object water quality is with embodiment 1. The treatment process is as follows.
[0029] Step S10. Take 800ml of the above waste water, add 75ml of hydrochloric acid to adjust the pH value of the waste water to 7, and receive 500ml of fraction and residual liquid after atmospheric distillation. After testing, the COD value of the fraction is 10559mg / L.
[0030] Step S20. After desalting the residue obtained in step S10 by suction filtration, 110 g of filtrate and salt were obtained;
[0031] Step S30. The filtrate obtained in step S20 is subjected to vacuum distillation at a pressure of -0.095mpa and an external heating temperature of 200°C to obtain a fraction of 325ml at a gas phase temperature of 20°C to 100°C (COD value is 15346mg / L ) and a fraction of 35ml at a gas phase temperature of 100°C to 120°C. After testing, the 1,2-propanediol content in ...
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