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Treatment process for two stage recycling alkali waste liquid drained off by process system of synthesizing octanol

A synthesis process and recovery treatment technology, which is applied in the field of environmental technology and chemical separation, can solve the problems of unexplained how to recover organic components and low removal efficiency, so as to overcome the increase of regeneration boiling point, save equipment investment and operating costs, and control significant effect

Inactive Publication Date: 2003-12-24
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

But the main disadvantage of this method is that its COD Cr The removal efficiency of the waste lye is low. After the waste lye is treated by this method, the COD of the effluent Cr The concentration is still very high (up to about 30000mg / L), and at the same time, the method does not explain how to recover the organic components extracted from the spent lye

Method used

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  • Treatment process for two stage recycling alkali waste liquid drained off by process system of synthesizing octanol
  • Treatment process for two stage recycling alkali waste liquid drained off by process system of synthesizing octanol

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specific Embodiment approach

[0017] The specific process of the present invention for processing octanol waste lye will be described in detail below in conjunction with the accompanying drawings.

[0018] Process flow of the present invention such as figure 1 As shown, within the temperature range of 45-60°C, the waste lye and concentrated sulfuric acid are stirred and mixed evenly in the acidity adjustment tank, and the pH value is adjusted to 1-4, preferably 1.5 Between ~ 3.0, the consumption of concentrated sulfuric acid is added by the ratio of concentrated sulfuric acid (93%): waste lye = 1: 19 ~ 66 (weight ratio), then waste water and extraction agent 2-ethylhexanol are reversely introduced into the extractor Or in the extraction tower. The consumption of extractant is added according to the ratio of extractant: waste water=1: 4~16 (volume ratio). The extractor is equipped with 1-3 stages of extraction units, each stage of extraction unit is composed of a mixer with a stirring device and a separat...

Embodiment 1

[0022] For temperature 50°C and COD Cr Concentration is the waste alkali liquor of 42.2g / L to carry out treatment. The weight ratio of concentrated sulfuric acid (93%) and spent lye is that both are added in the acidity adjustment tank in the ratio of 1: 19, the pH value of waste water is 1.5, waste water and extraction agent (2-ethylhexanol) are mixed with The countercurrent mode is introduced into the pulse packed tower, the waste water is introduced from the top of the extraction tower as a continuous phase, and the extractant is introduced from the bottom of the extraction tower as a dispersed phase, and the amount of the extractant is 1 / g of the volume of the spent lye. COD of the raffinate phase of the extraction operation Cr The concentration is 4.9g / L, COD Cr The removal rate was 88.4%. Pass compressed air in the adsorption tank to stir the raffinate phase with granular activated carbon with an amount of 50g / L for 1 hour and then let it stand for 20 minutes to absor...

Embodiment 2～4

[0024] Treat the waste lye with a temperature of 50°C. The weight ratio of concentrated sulfuric acid (93%) and waste lye is 1:62, the two are added in the acidity adjustment tank, the pH value of the waste water is 2.86, and the extraction agent 2-ethylhexanol and the waste water are countercurrently Import into the extraction tower equipped with secondary extraction units, add extractant to each extraction unit according to a certain volume ratio, and the mixed solution is vigorously stirred in the mixer of each extraction unit for 2 minutes, and then enters the separator After standing for 10 minutes, the extract phase and the raffinate phase were separated, and the raffinate phase and the granular activated carbon with an amount of 50g / L were stirred in the adsorption tank for 1 hour and then allowed to stand for 2 hours. See Table 1 for the treatment effects under the action.

[0025]

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Abstract

A two-stage process for reclaiming the waste alkaline solution discharged by octanol synthesizing system includes "after-heat self-extracting" and "activated carbon adsorption" stages, that is, usingthe afterheat and inorganic acid to acidify the waste alkaline solution, extracting the organic components from waste solution by 2-ethylhexanol as the product of said octanol synthesizing system, adsorbing the residual phase by granular activated carbon, neutralizing by alkali, biochemical treating, and regenerating the used activated carbon. Its advantagesa re high effect etc.

Description

Technical field: [0001] The invention relates to a secondary recovery and treatment method for waste lye discharged from an octanol synthesis process system, in particular to a treatment method for waste lye discharged from an octenal reaction system formed by condensation of aldehydes and aldehydes, and belongs to the field of environmental technology and chemical separation . Background technique: [0002] In order to alleviate the problem of short supply of butanol and octanol, my country has introduced technology from abroad to build a low-pressure carbonylation device for producing butanol and octanol. The low-pressure oxo synthesis of butanol is based on synthesis gas (CO+H 2 ) and propylene as raw materials, generate n-butyraldehyde and isobutyraldehyde under the effect of rhodium-phosphine complex catalyst. After separation of n-butyraldehyde and isobutyraldehyde, n-butyraldehyde is condensed under the catalysis of sodium hydroxide solution to form octenal, and oct...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F1/28C02F1/66C02F9/02C02F9/04
Inventor 贾金平徐金球王亚林袁俊
Owner SHANGHAI JIAO TONG UNIV
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