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Circulation method for recovering organic acid from organic acid lithium waste water

A technology for recycling lithium organic acid and wastewater, applied in the direction of extraction water/sewage treatment, etc., can solve the problems of unenvironmental protection, unseen waste water recycling, uneconomical and other problems, and achieve the effect of ensuring sanitation, environmental protection of treatment methods and low cost.

Active Publication Date: 2015-11-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the waste water is discharged directly, the organic acid will be consumed, and this unenvironmental and uneconomical method of treating waste water is not suitable for use
[0004] So far, there have been no relevant literature reports on how to recover the waste water after the residual lithium in the lithium-based polymer glue is removed with an organic acid

Method used

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  • Circulation method for recovering organic acid from organic acid lithium waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After adding 600ml of waste water containing lithium neodecanoate (where the COD is 2200mg / L) and 200g of 99.5wt% cyclohexane into a 2000ml three-necked flask equipped with a thermometer, start stirring at room temperature at 20°C, and then dropwise add 7.04wt % dilute sulfuric acid solution, until the pH=3.0 of the solution, after stirring for 10min, the pH value remains unchanged, stop adding acid at this time, then use a separatory funnel to stand for stratification for 3min, and divide the lower water phase, at this time the water The COD of phase is 420mg / L; Measure the neodecanoic acid 0.41wt% in the upper layer oil phase solution, separate the cyclohexane solution containing neodecanoic acid and store for standby, wait to be sent into lithium-containing colloid for delithiation.

Embodiment 2

[0028] After adding 600ml of wastewater containing lithium laurate (where the COD is 2300mg / L) and 200g of 99.5wt% cyclohexane into a 2000ml three-necked flask equipped with a thermometer, preheat to 40°C, start stirring, and then dropwise add 6.02wt % dilute hydrochloric acid solution, until the pH of the solution=5.3, after stirring for 10 minutes, the pH value remains unchanged, stop adding acid, then use a separatory funnel to stand for stratification for 5 minutes, and divide the lower water phase, at this time, the water The COD of phase is 430mg / L; Record the 0.44wt% of lauric acid in the upper oil phase solution, separate the cyclohexane solution containing lauric acid and store for standby, to be sent into the lithium-containing colloid for delithiation.

Embodiment 3

[0030]After adding 600ml of waste water containing lithium isooctanoate (where the COD is 2400mg / L) and 150g of 99.5wt% cyclohexane into a 2000ml three-necked flask equipped with a thermometer, preheat to 60°C, start stirring, and then dropwise add 6.60wt % dilute phosphoric acid solution until the pH of the solution is 5.6. After stirring for 10 minutes, the pH value remains unchanged, stop adding acid, then use a separatory funnel to stand for stratification for 4 minutes, and remove the lower water phase. At this time, the water The COD of phase is 450mg / L; Record the isooctanoic acid 0.54wt% in the upper strata oil phase solution, separate the cyclohexane solution containing isooctanoic acid and store for standby, wait to send into the lithium-containing glue solution and carry out delithiation.

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Abstract

The invention discloses a circulation method for recovering organic acid from organic acid lithium waste water. The circulation method is characterized in that the waste water is generated by lithium deintercalation in a lithium system polymer glue solution through organic acid; solvent and acidifying agents used for polymerization reaction of generated lithium system polymers are added into the waste water for acidifying reaction with organic acid lithium in the waste water, and the pH value of an acidifying reaction endpoint is controlled to be within 3.0-6.9; the organic acid is extracted to be recovered through the solvent, and oil phases obtained after layering are returned into the process of lithium deintercalation of the organic acid. The method can be used for using the original organic acid in a lithium system polymer glue solution lithium deintercalation unit in a circulating mode after the organic acid lithium waste water is treated and restored, meanwhile, COD in the waste water can be effectively reduced, and corrosion to equipment in the treatment process is greatly reduced; the lithium deintercalation cost in the lithium system polymer technology is effectively lowered.

Description

technical field [0001] The invention relates to a method for recovering and recycling waste water containing organic acid lithium after catalyst residual lithium in lithium-based polymer glue is delithiated by an organic acid method. Background technique [0002] In the preparation of lithium-based styrene-conjugated diene elastomer SBS, SIS glue, and titanium-based catalytic hydrogenation to prepare SEBS, the presence of residual basic lithium compounds will lead to yellowing of the product, especially yellowing of SEBS and increased haze , Decreased transparency. Usually, the lithium content in SEBS series products of companies such as Kraton and Kuraray is not higher than 10ppm. At the same time, the lithium content in SEBS is too high and is not suitable for use in medical devices and other high-end fields. In the lithium series SBS, SEBS, SIS and other products of the synthetic rubber factory of Sinopec Baling Petrochemical Company, the cyclohexane solution of organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26
Inventor 李望明梁红文张建国彭小寒姚琼
Owner CHINA PETROLEUM & CHEM CORP
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