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Membrane separation method for resource recovery of sorbic acid in sorbic acid wastewater

A technology of sorbic acid wastewater and sorbic acid, which is applied in the field of separation, can solve the problems of large area occupied by resin equipment, reduced resin life, cumbersome post-treatment, etc., and achieves the effects of low operating costs, improved utilization rate, and improved biodegradability

Pending Publication Date: 2022-07-01
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0018] The above-mentioned technologies all use resin to absorb sorbic acid in the wastewater, and then elute the sorbic acid adsorbed in the resin by means of alcohol or alkali; the resin process recycles sorbic acid, although it has a certain effect, there is still a small amount of sorbic acid in the sorbic acid wastewater. Polymer tar substances, long-term use of the resin will block the pores, and the life of the resin will decrease; and the resin equipment occupies a large area, and the post-processing after the resin analysis is more cumbersome

Method used

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  • Membrane separation method for resource recovery of sorbic acid in sorbic acid wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The wastewater stock solution was first adjusted to pH=2 with liquid alkali, passed through an ultrafiltration membrane device (inorganic membrane retention accuracy 1000Da), controlled pressure 0.1Mpa, temperature 20-30°C, filtered and intercepted solid suspended solids and macromolecular tar substances to obtain Clarify the filtrate; heat the clarified filtrate after ultrafiltration to 90-95°C by heat exchange, and then pass through a nanofiltration membrane concentration device (with an organic membrane interception accuracy of 100Da), control the vacuum degree to -0.1--0.095MPa, and intercept sorbic acid to obtain sorbic acid containing sorbic acid. Acid concentrated water and clear liquid; clear liquid de-biochemical treatment system; concentrated water containing sorbic acid is cooled to 10-15 ° C by cooling water, crystallized, filtered, and sorbic acid is removed from the production system, and the filtrate is incorporated into ultrafiltration. The clear liquid; ...

Embodiment 2

[0056] The wastewater stock solution was first adjusted to pH=3 with liquid alkali, passed through an ultrafiltration membrane device (inorganic membrane retention accuracy 1000Da), controlled pressure 0.25Mpa, temperature 20-30°C, filtered and intercepted solid suspended solids and macromolecular tar substances to obtain Clarify the filtrate; heat the clarified filtrate after ultrafiltration to 80-85°C by heat exchange, and then pass through a nanofiltration membrane concentration device (with an organic membrane interception accuracy of 100Da), control the vacuum degree to -0.095--0.09MPa, and retain sorbic acid to obtain sorbic acid containing sorbic acid. Acid concentrated water and clear liquid; clear liquid to biochemical treatment system; concentrated water containing sorbic acid is cooled to 20-25 ° C by cooling water, crystallized, filtered, and sorbic acid is removed from the production system, and the filtrate is incorporated into ultrafiltration. The clear liquid; s...

Embodiment 3

[0058] The wastewater stock solution was first adjusted to pH=4 with liquid alkali, passed through an ultrafiltration membrane device (with an organic membrane retention accuracy of 2000Da), controlled at a pressure of 0.5Mpa and a temperature of 20-30°C, filtered to intercept solid suspended solids and macromolecular tar substances to obtain Clarify the filtrate; heat the clarified filtrate after ultrafiltration to 70-75°C by heat exchange, and then pass through a nanofiltration membrane concentration device (inorganic membrane retention accuracy 200Da), control the vacuum degree to -0.085--0.08MPa, and retain sorbic acid to obtain sorbic acid containing sorbic acid. Acid concentrated water and clear liquid; clear liquid to biochemical treatment system; concentrated water containing sorbic acid is cooled to 35 ~ 40 ° C by cooling water, crystallized, filtered, and sorbic acid is removed from the production system, and the filtrate is incorporated into ultrafiltration. The clar...

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Abstract

The invention discloses a membrane separation method for resource recovery of sorbic acid in sorbic acid wastewater, which comprises the following steps: adjusting the pH value of a sorbic acid wastewater stock solution to 2-5, dissociating macromolecular tar substances, and filtering and intercepting suspended solids and macromolecular tar substances through an ultrafiltration membrane device under the pressure of 0.01-0.5 Mpa and the temperature of 20-30 DEG C to obtain clear filtrate; raising the temperature of the clarified filtrate after ultrafiltration to 60-95 DEG C, enabling the clarified filtrate to pass through a nanofiltration membrane concentration device, controlling the operation vacuum degree to be-0.1 to-0.06 MPa, and intercepting sorbic acid to obtain concentrated water containing sorbic acid and clear liquid; cooling the concentrated water to 10-40 DEG C, crystallizing and filtering; and merging the obtained filtrate into clarified liquor treated by the ultrafiltration membrane, and feeding the clarified liquor into a nanofiltration membrane separation system to continuously separate sorbic acid. The residual sorbic acid in the sorbic acid production wastewater is separated and recovered by adopting a membrane separation process, and compared with a resin method process, resource recycling can be better realized.

Description

technical field [0001] The invention relates to the technical field of separation, in particular to a membrane separation method for separating sorbic acid. Background technique [0002] sorbic acid [0003] Chinese alias: 2-propenyl acrylic acid; 2,4-hexadienoic acid; herbal tea acid; [0004] English name: (2E,4E)-hexa-2,4-dienoic acid [0005] English alias: Sorbistat; 2,4-Hexadienoic acid; sorbinic acid; [0006] Molecular formula and molecular weight: C6H8O2=112.13 [0007] Appearance: White needle or powder crystal [0008] Melting point (°C): 132-135°C (lit.) [0009] Boiling point: 228℃ [0010] Flash point: 127℃ [0011] Water solubility: 887g / L (20℃) [0012] Solubility: slightly soluble in water, soluble in propylene glycol, absolute ethanol and methanol, glacial acetic acid, acetone, benzene, carbon tetrachloride, cyclohexane, dioxane, glycerol, isopropanol, isopropyl ether, acetic acid Methyl ester, toluene. [0013] Sorbic acid is an efficient and saf...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/34
CPCC02F9/00C02F1/444C02F1/442C02F1/66C02F2301/08C02F2101/34C02F1/52C02F2001/5218
Inventor 庆九俞新南朱小刚刘芳
Owner NANTONG ACETIC ACID CHEM
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