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Method for recovering organic matters in polyester wastewater

A technology of polyester wastewater and organic matter, which is applied in the recycling of organic matter in polyester wastewater, the recycling and reuse of polyester wastewater, can solve the problems of increased processing costs, high equipment requirements, and low concentration of acetaldehyde solution, and achieves the goal of overcoming Safety issues, reduction of handling process, effect of good economic benefits

Active Publication Date: 2013-04-03
SHANGHAI JUYOU CHEM ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain ethylene glycol with high purity, but when water is used to directly absorb acetaldehyde vapor, the industrial water is increased and the concentration of the obtained acetaldehyde solution is too low, which requires follow-up treatment, which increases the treatment cost, and the method It is a batch method, especially the introduction of intermittent acid catalytic treatment by-product 2-methyl-1,3-dioxolane, which requires high requirements for industrial equipment due to the corrosiveness of the acid

Method used

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  • Method for recovering organic matters in polyester wastewater
  • Method for recovering organic matters in polyester wastewater
  • Method for recovering organic matters in polyester wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The specific implementation is carried out by using the treatment process flow without adding a waste water separation tower, and the specific implementation results are as follows:

[0037]Mix the esterification waste water with a flow rate of 42012kg / hr and a stream of acetaldehyde from the acetaldehyde rectification tower 2 at a flow rate of 150kg / hr, and mix them evenly for a residence time of 40min, then charge them into the stripping tower 1, and simultaneously feed them into the tower The kettle steam 101 is passed into heat source water vapor, the flow rate of water vapor is 3000kg / hr, and the temperature is 110°C. After being treated by the stripping tower 1, the ethylene glycol with an EG content of only 0.02% is collected from the waste water collection device 102 at the bottom of the tower kettle. Alcohol, carry out sewage treatment, collect the flow of the mixture of ethylene glycol and acetaldehyde and 2-MD from stripping tower top vapor recovery unit 103 b...

Embodiment 2

[0043] The specific implementation is carried out by using the treatment process of adding a waste water separation tower, and the specific implementation results are as follows:

[0044] Mix the esterification waste water with a flow rate of 34255kg / hr and a stream of acetaldehyde from the acetaldehyde rectification tower 2 at a flow rate of 100kg / hr, and mix them evenly for a residence time of 35min. The kettle steam 101 is passed into heat source water vapor, the flow rate of water vapor is 2600kg / hr, and the temperature is 120°C. After being treated by the stripping tower 1, ethylene glycol with an EG content of only 0.02% is collected from the waste water collection device 102 at the bottom of the tower kettle. Alcohol, carry out sewage treatment, the flow that collects the mixture of ethylene glycol and acetaldehyde and 2-MD from stripping tower top vapor recovery unit 103 is 700kg / hr, and this part material enters waste water separation tower 4, in waste water separation...

specific Embodiment approach

[0087] Below in conjunction with embodiment, the present invention is described further.

[0088] Example 1

[0089] The specific implementation is carried out by using the treatment process flow without adding a waste water separation tower, and the specific implementation results are as follows:

[0090] Mix the esterification waste water with a flow rate of 42012kg / hr and a stream of acetaldehyde from the acetaldehyde rectification tower 2 at a flow rate of 150kg / hr, and mix them evenly for a residence time of 40min, then charge them into the stripping tower 1, and simultaneously feed them into the tower The kettle steam 101 is passed into heat source water vapor, the flow rate of water vapor is 3000kg / hr, and the temperature is 110°C. After being treated by the stripping tower 1, the ethylene glycol with an EG content of only 0.02% is collected from the waste water collection device 102 at the bottom of the tower kettle. Alcohol, carry out sewage treatment, collect the fl...

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Abstract

The present invention discloses a method for recovering organic matters in polyester wastewater. The method comprises the following steps that: (1) polyester wastewater enters a gas stripping tower to be subjected to a treatment, and organic matter gas and steam collected from the top of the tower directly enter an acetaldehyde rectification tower; (2) after treatment by the acetaldehyde rectification tower, high purity acetaldehyde is obtained from the top of the tower, and is divided into two parts, one part is externally collected, and the other part is reused for the gas stripping tower in the step (1), such that the acetaldehyde reacts with a small amount of ethylene glycol in the wastewater to produce 2-methyl-1,3-dioxolane, concurrently 2-methyl-1,3-dioxolane hydrolysis during the process is reduced, and the wastewater on the bottom of the tower enters an ethylene glycol distillation tower; and (3) after treatment by the ethylene glycol distillation tower, a high purity ethylene glycol solution is collected from the bottom of the tower, and waste gas and steam produced from the top of the tower re-enter the gas stripping tower to be recycled. According to the present invention, continuous acetaldehyde and ethylene glycol collection is adopted, such that gas stripping efficiency is increased so as to further reduce a COD value of the sewage on the bottom of the tower, wherein the sewage is subjected to the gas stripping treatment.

Description

technical field [0001] The invention relates to a method for recycling and reusing polyester wastewater in the field of chemical industry, and more particularly relates to a method for recycling organic matter in polyester wastewater. Background technique [0002] Polyester Polyethylene terephthalate (PET) is a polymer compound. Polyethylene terephthalate (PET) is produced by polycondensation of purified terephthalic acid (PTA) and ethylene glycol (EG), that is, direct esterification of terephthalic acid and ethylene glycol. The concentration of the esterification wastewater discharged during the process is greatly affected by the esterification reaction conditions, and the COD concentration of the esterification wastewater is about 20000-30000mg / L. In addition, in the reaction process of this method, organic pollutants are produced, such as the main organic by-products in the current polyester wastewater are ethylene glycol, acetaldehyde and 2-methyl-1,3-dioxolane, wherein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/06C07C45/59C07C31/20C07C29/10C02F1/04
Inventor 汪少朋张学斌武术芳甘胜华李红彬
Owner SHANGHAI JUYOU CHEM ENG
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