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Self-extracting treating method for exhausted lye discharge from octanol synthetic system

A treatment method and technology of waste lye, which is applied in the field of environmental technology and chemical separation, can solve the problems of low removal efficiency, sludge bulking in biochemical treatment systems, and no instructions on how to recover organic components, so as to save equipment investment and operation cost, saving working capital, and overcoming the effect of rising boiling point of regeneration

Inactive Publication Date: 2005-06-15
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 the effluent must be diluted or otherwise treated multiple times before being sent to the biochemical treatment system, otherwise, it will still cause the sludge in the biochemical treatment system to expand, thus not fundamentally solving the problem
At the same time, the method does not explain how to recover the organic components extracted from the spent caustic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The weight ratio of concentrated sulfuric acid (93%) and waste water is that the ratio of 1: 19 will add the concentrated sulfuric acid and waste water in the stirring tank, the pH value of waste water is 1.46, and water phase and extraction agent (2-ethylhexanol) are mixed with The countercurrent method is introduced into the pulse packed tower, the water phase 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. The volume ratio of waste water to extractant is 8:1. under the condition of 60°C. After the wastewater is extracted and treated, its COD Cr Concentration dropped from 42.2g / L to 4.5g / L, COD Cr The removal rate was 89.5%.

Embodiment 2～6

[0020] Be that the ratio of 1: 62 is that the weight ratio of vitriol oil (93%) and waste water is added vitriol oil and waste water in the stirred tank, and the pH value of waste water is 2.86, and extracting agent 2-ethylhexanol and water phase are in countercurrent mode Import into the extraction tower equipped with secondary extraction units, add extractant in a certain proportion to each extraction unit, the mixed solution is stirred vigorously for 2 minutes in the mixer of each extraction unit, and then enters the separator to statically After standing for 10 minutes, the extract phase and the water phase were separated, and the test was carried out under the condition that the temperature of the waste water was 10°C. The treatment effect of wastewater under the action of different proportions of extractant is shown in Table 1.

[0021] Example

Embodiment 7～10

[0023] The weight ratio of concentrated sulfuric acid (93%) and waste water is that the ratio of 1: 62 is that the concentrated sulfuric acid and waste water are added in the stirring tank, and the pH value of waste water is 2.86, then extractant 2-ethylhexanol and water phase are in countercurrent The method is introduced into the extraction tower equipped with a secondary extraction unit, and the extraction agent is added to each extraction unit according to the volume ratio of waste water and extraction agent at a ratio of 4:1, and the mixed solution passes through the mixer of each extraction unit for 2 Stir vigorously for 10 minutes, then enter the separator and let it stand for 10 minutes to separate the extract phase and the water phase. The tests were carried out under the conditions of wastewater temperatures of 10°C, 30°C, 50°C, and 60°C. The treatment effects of wastewater at different temperatures are shown in Table 2.

[0024] Example

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Abstract

The invention relates to a self-extraction treatment method for waste lye discharged from an octanol synthesis system. The pH value of the waste lye is adjusted to the range of 1-5 by using inorganic acid, and the temperature of the waste water is in the range of 10-60° C. Using 2-ethylhexanol as the extraction agent, the wastewater is extracted in an extraction tower or an extractor equipped with a multi-stage extraction unit. COD of spent lye Cr The removal rate is over 80%. The water phase after the extraction treatment is neutralized with alkali and diluted with a small amount of water, and then enters the biochemical treatment system for treatment to make the final effluent meet the discharge standard, and the extracted phase is returned to the hydrogenation process or rectification process of the octanol synthesis system for processing, so that the The extractant and organic components are finally converted into a series of qualified products of the system.

Description

Technical field: [0001] The invention relates to a self-extraction treatment method for waste lye discharged from an octanol synthesis system, in particular to a treatment method for waste lye discharged from a 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 octenal is hydrogenat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F9/02C02F9/04C02F9/08
Inventor 贾金平徐金球王亚林袁俊
Owner SHANGHAI JIAOTONG UNIV
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