Treatment method of glycerin wastewater containing salt

A treatment method and technology for wastewater, which are applied in heating water/sewage treatment, extraction water/sewage treatment, water/sewage multi-stage treatment, etc. Operation and Control, Reduced Production Costs, Environmentally Friendly Effects

Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the salt contained in crude glycerin makes the boiling point of the system rise, not only a large amount of heat energy is consumed in the concentration and distillation, but also the deposition of salt precipitated with the evaporation of water causes additional burdens such as operation and equipment loss.
Therefore, the cost of traditional glycerin purification process is very high

Method used

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  • Treatment method of glycerin wastewater containing salt
  • Treatment method of glycerin wastewater containing salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The amount of n-butanol in this example is 2.5 times that of the production wastewater. The process flow is established according to the accompanying drawings, and the specific logistics connection is referred to the introduction of the process flow in the summary of the invention. Wastewater feed 22 (flow 1395.2kg / hr, water 56%, glycerol 26%, sodium chloride 18%) and filtrate 6 in filter F1 (flow 1668.8kg / hr, water 55%, glycerol 27%, sodium chloride accounted for 15%, n-butanol accounted for 3%) mixed into waste water circulation mixture material 1 (flow rate 3064kg / hr), and n-butanol circulation stream 2 (flow rate 7500kg / hr) in the third mixer M3 mixed in the middle to form waste water and solvent mixture 23 (flow rate 10564kg / hr) and enter the extraction tower R1. Operate at atmospheric pressure at a temperature of 30°C. In the extractor R1, the output extraction tower lower layer stream 3 (flow rate is 1921.7kg / hr, water accounts for 55%, glycerol accounts for 27...

Embodiment 2

[0030] The amount of n-butanol in this example is 1.3 times that of the production wastewater. The process flow is established according to the accompanying drawings, and the specific logistics connection is referred to the introduction of the process flow in the summary of the invention. Wastewater feed 22 (flow 792.1kg / hr, water 56%, glycerol 24%, sodium chloride 20%) and filter F1 filtrate 6 (flow 2297.9kg / hr, water 55%, glycerol 27%, sodium chloride accounted for 15%, n-butanol accounted for 3%) mixed into waste water circulation mixture material 1 (flow rate 3090kg / hr) and n-butanol circulation stream 2 (flow rate 3911.5kg / hr) in the third mixer M3 Mixed in, form waste water, solvent mixture 23 (flow rate 7010kg / hr) enter extraction tower R1. Operate at atmospheric pressure at a temperature of 50°C. In the extractor R1, the output extraction tower lower layer stream 3 (flow rate is 2443.5kg / hr, water accounts for 51%, glycerol accounts for 25%, sodium chloride accounts ...

Embodiment 3

[0035] The amount of n-butanol in this example is 3.3 times that of the production wastewater. The process flow is established according to the accompanying drawings, and the specific logistics connection is referred to the introduction of the process flow in the summary of the invention. Wastewater feed 22 (flow 1841.9kg / hr, water 56%, glycerol 18%, sodium chloride 26%) and filtrate 6 in filter F1 (flow 1208.1kg / hr, water 55%, glycerol 27%, sodium chloride accounted for 15%, n-butanol accounted for 3%) mixed into waste water circulation mixture material 1 (flow rate 3050kg / hr) and n-butanol circulation stream 2 (flow rate 9932.5kg / hr) in the third mixer M3 Mixed in, form waste water, solvent mixture 23 (flow rate 13010kg / hr) enter extraction tower R1. Operated at atmospheric pressure at a temperature of 70°C. In the extractor R1, the output extraction tower lower layer stream 3 (flow rate is 1533.0kg / hr, water accounts for 43%, glycerol accounts for 21%, sodium chloride acc...

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Abstract

The invention discloses a treatment method of glycerin wastewater containing salt. Glycerin waste water containing salt produced during different production processes is added in normal butanol with the amount being 1.3 to 3.3 times of wastewater quantity; with the addition of normal butanol, under the normal pressure and the temperature of 30 to 70 DEG C, salt in glycerin wastewater containing salt is separated out by crystallization, the liquid phase is divided into an upper organic phase and a lower water phase; the upper organic phase contains 0.3 percent of salt, and is rectified, normalbutanol is recovered, and water is removed at the same time, so that 99.9 percent of pure glycerin serving as a product is obtained; and the lower water phase is filtered, filtrate flows back to an extraction tower for retreatment, and crystallized sodium chloride is washed and recovered. The treatment method has the advantages of simple and convenient process flow, easiness in operation and control, and environmental friendliness; and glycerin and sodium chloride in wastewater can be recycled, so that the production cost can be reduced effectively. The invention is especially suitable for byproducts in epoxide resin production, glycerin byproducts in oil and glycerin chemical production and wastewater treatment of glycerin byproducts in biodiesel production.

Description

technical field [0001] The invention relates to a treatment method for wastewater, in particular to a treatment method for saline glycerin wastewater. Background technique [0002] In recent years, with the growth of epoxy resin and biodiesel production, the treatment volume of production wastewater containing by-product glycerol has risen sharply. This glycerin wastewater contains a large amount of salt. At present, the crude glycerol purification process needs to go through processes such as concentration, distillation, adsorption and ion exchange to obtain high-quality refined glycerin. However, since the salt contained in crude glycerin increases the boiling point of the system, not only a large amount of heat energy is consumed in the concentration and distillation, but also the deposition of salt precipitated with the evaporation of water causes additional burdens such as operation and equipment loss. Therefore, the cost of the traditional glycerin purification proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C29/82C07C31/22C01D3/04C02F1/26C02F1/04
Inventor 南碎飞陈辉窦梅林丽
Owner ZHEJIANG UNIV
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