Method for treating waste alkaline liquor produced in butanol and octanol production device

Abstract

The invention discloses a method for treating waste alkaline liquor produced in a butanol and octanol production device and belongs to the field of treatment on waste water produced by organic compound production. The method is characterized by comprising the following steps of a, normal-pressure steam stripping, b, low-pressure evaporation concentration, c, acidification phase-separation, d, organic phase rectification, and e, simple evaporation concentration. The method for treating waste alkaline liquor produced in a butanol and octanol production device has a high chemical oxygen demand (COD) removal rate, a low equipment investment, simple treatment processes, low energy consumption and a low treatment cost, is suitable for industrial production, realizes full recovery and use of all components, and does not produce secondary pollution. A COD removal rate of the method is great than or equal to 99%. Before treatment, the COD is great than or equal to 50000mg / L and after treatment, the COD is less than or equal to 500mg / L.

Description

technical field [0001] The invention relates to a treatment method for waste lye produced in a butanol production device, which belongs to the treatment of waste water from organic compound production. Background technique [0002] In the process of producing butanol or octanol and isobutyraldehyde by low-pressure oxo synthesis, the condensation of n-butyraldehyde to form octenal needs to be carried out in the presence of an alkali catalyst, and the reaction product is accompanied by the formation of water at the same time. leading to a decrease in catalyst concentration. In order to keep the concentration of catalyst sodium hydroxide stable, a part of dilute lye must be continuously discharged from the system, and a part of concentrated lye must be added at the same time to maintain the normal operation of the condensation reaction system. Pollutants in the alkaline wastewater discharged from this process include n-butanol, isobutanol, n-butyraldehyde, isobutyraldehyde, oc...

AI Technical Summary

Problems solved by technology

Pollutants in the alkaline wastewater discharged from this process include n-butanol, isobutanol, n-butyraldehyde, isobutyraldehyde, octenal, octanol, etc. The COD value of the wastewater fluctuates greatly, usually around 50000mg / L , sometimes can reach more than 100000mg / L, and at the same time the pH value is very high, so it is difficult to handle

[0003] Due to the high concentration of organic matter in the alkaline high-concentration wastewater produced by the butyl-octyl alcohol device, it is difficult to treat it. At present, enterprises usually do not treat it, and generally take the method of diluting it and sending it directly to the sewage treatment plant, which increases the load on the sewage treatment system and brings waste to the sewage. Processing brings a greater burden and wastes precious raw material resources

[0004] In the prior art, CN1124230C first uses inorganic acid to acidify the waste lye of the butyl octanol unit, and then adds an organic extractant for extraction. After the method is processed, the COD removal rate reaches 50%; the removal efficiency is low

[0005] CN101172725A first adjusts the pH value of butanol spent lye to carry out sedimentation and stratification, then carries out catalytic oxidation, and finally carries out neutralization for solid-liquid separation. After treatment, the removal rate of COD reaches 97%, but the equipment investment is large and the treatment process is complicated , high energy consumption, high processing costs, difficult to implement in industry

[0006] Moreover, the extraction or oxidation reaction adopted by these methods is easy to introduce other organic pollutants, resulting in secondary pollution.

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