Method for separating and reclaiming sorbic acid from waste water of sorbic acid production

A technology for producing waste water and sorbic acid, which is applied in the fields of chemical industry or environmental protection, can solve the problems of non-recycling and high consumption of sorbic acid, and achieve the effects of subsequent treatment difficulty and cost reduction, simple process and convenient operation

Inactive Publication Date: 2008-05-14
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only consumes a large amount of water for dilution, but also the valuable sorbic acid contained in the wastewater cannot be recovered.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Adsorption

[0021] Fill a φ55×800mm glass adsorption column with 700ml (5 times the height-to-diameter ratio) double-network interpenetrating secondary cross-linked modified adsorption resin (XDA-1G), filter and adjust to pH 2.0 and sorbic acid concentration to 0.5 The mg / mL sorbic acid production wastewater flows through the adsorption column from top to bottom. The flow rate of the wastewater is controlled at 1-2BV per hour. The measured flow rate is 15-20ml / min. Concentration until it reaches about 10% of the concentration of the original solution, that is, the adsorption is stopped, and then desorption is carried out. 700mL resin can treat about 15,000-16,000mL of wastewater to reach adsorption equilibrium, and the dynamic adsorption efficiency of resin to sorbic acid in wastewater is ≥99%.

Embodiment 2

[0022] Example 2 Adsorption

[0023] Fill 1000ml (8 times the height-to-diameter ratio) double-network interpenetrating secondary cross-linked modified adsorption resin (XDA-1G) in a φ55×800mm glass adsorption column, filter and adjust to pH 2.5 and sorbic acid concentration to 1.0 The mg / mL sorbic acid production wastewater flows through the adsorption column from top to bottom, the flow rate of the wastewater is controlled at 1-2BV per hour, the room temperature is ≤35°C, and the measured flow rate is 20-30ml / min, and the sorbic acid is regularly sampled and analyzed Concentration until it reaches about 10% of the concentration of the original solution, that is, the adsorption is stopped, and then desorption is carried out. 1000mL resin can treat about 10000-12000mL of wastewater to reach adsorption equilibrium, and the dynamic adsorption efficiency of resin to sorbic acid in wastewater is ≥99%.

Embodiment 3

[0024] Example 3 Adsorption

[0025] Fill 1700ml (13 times the height-to-diameter ratio) double-network interpenetrating secondary crosslinking modified adsorption resin (XDA-1G) in a φ55×800mm glass adsorption column, filter and adjust to pH 3.0 and sorbic acid concentration to 1.0 The mg / mL sorbic acid production wastewater flows through the adsorption column from top to bottom. The flow rate of the wastewater is controlled at 1-2BV per hour, and the room temperature is ≤35°C. Concentration until it reaches about 10% of the concentration of the original solution, that is, the adsorption is stopped, and then desorption is carried out. 1700mL resin can treat about 20000-22000mL of wastewater to reach adsorption equilibrium, and the dynamic adsorption efficiency of resin to sorbic acid in wastewater is ≥97%.

[0026] Embodiment 3 desorption and distillation

[0027] Fill the φ55×800mm glass adsorption column with 1000ml of secondary double-network interpenetrating cross-linke...

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Abstract

The invention discloses a method for recovering sorbic acid from sorbic acid production wastewater, which belongs to the technical field of chemical industry and environment protection. The concentration of residual sorbic acid in the wastewater is between 0.5 to 1.0mg/ml. Dual-network mutual penetration quadric crosslinking modification adsorption resin (XDA-1G) is adopted to dynamically adsorb residual sorbic acid in sorbic acid production wastewater. After the adsorption is saturated, dynamic desorption and distillation is adopted for separation and recovery. The ratio of height to diameter of resin bed in the adsorption column is kept between 5 to 13, the wastewater pH is adjusted to 2.0 to 3.0, control room temperature is no more than 35 DEG C, flow rate of wastewater is controlled to 1 to 2BV per hour, 95% ethanol is used for desorption. Sorbic acid is obtained after distilling desorption liquid and removing ethanol.

Description

technical field [0001] The invention belongs to the technical field of chemical industry or environmental protection, and relates to a recovery process of effective substances in food additive production wastewater, in particular to a method for separating and recovering sorbic acid from sorbic acid production wastewater. Background technique [0002] There are many manufacturers of sorbic acid in our country, and a large amount of wastewater containing high concentration of sorbic acid will be produced in the process of sorbic acid production. At present, the treatment method of this kind of wastewater mainly adopts biochemical method. This method not only needs to consume a large amount of water for dilution, but also the high-value sorbic acid contained in the waste water cannot be recovered. The advantage of the resin adsorption method for treating organic chemical wastewater is to make the waste resource while treating the wastewater. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/47C07C57/10
Inventor 熊春华姚彩萍韩晓祥王亚宁
Owner ZHEJIANG GONGSHANG UNIVERSITY
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