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Light alkali recycling device

A technology of light alkali recovery and light alkali, which is applied in the field of light alkali recovery and utilization devices, can solve the problems of increased discharge, increased treatment costs, and difficult degradation, and achieves the effects of sufficient impurity treatment, reduced difficulty, and reduced costs

Pending Publication Date: 2022-04-12
徐州荣盛纺织整理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because PET is not resistant to alkali, PET will degrade in alkaline solution to produce PET oligomers and PTA. Therefore, when processing PET fabrics in the dyeing and finishing process, in order to increase the soft feel of PET fabrics, it is usually used in the production process. NaOH (caustic soda) treats the PET fabric, and the stripped PET oligomers and PTA are discharged into the sewage treatment station together with the waste lye. Due to the existence of PTA and PET oligomers, the COD (chemical oxygen demand) of the sewage will be caused. Very high, at the same time, PTA and PET oligomers are very difficult to degrade, so the cost of sewage treatment will be high and the discharge will increase
[0003] Patent CN201420168538.9 discloses a dyeing and finishing light alkali recycling device, which uses ultrafiltration membranes and activated carbon and other consumables, which increases the processing cost, and does not recycle PTA and PET oligomers

Method used

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, the light alkali recovery and utilization device provided by the present invention includes a light alkali storage tank, and the light alkali storage tank is connected with a rotary filter, a floating device, a spray evaporator, the first storage tank, and a capacity expansion evaporator successively; The floating device is connected so that a circulation loop is formed among the floating device, the spray evaporator, the first storage tank, and the expansion evaporator; a flow control valve is provided between the expansion evaporator and the first storage tank to control the flow into the expansion evaporator The flow of lye.

[0019] The spray evaporator and expansion evaporator are respectively connected with the condenser and the condensation pool for condensing and recovering the steam. The expansion evaporator is con...

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Abstract

The invention discloses a light alkali recycling device which comprises a light alkali storage tank, the light alkali storage tank is connected with a floating device, and a circulation loop is formed among the floating device, a spray evaporator and a flash evaporator; the solvent storage tank and the flash evaporator are respectively connected with the causticizing device and are used for carrying out causticizing reaction on alkali liquor with required concentration in the causticizing device; the causticizing device is connected with the air floatation tank and is used for carrying out air floatation treatment on the precipitated alkaline water; the air floatation tank is connected with the acid liquor storage tank and used for enabling alkali liquor in the air floatation tank to be subjected to neutralization reaction, and the air floatation tank is connected with the filter pressing device and used for recycling materials. On the premise that consumables such as an ultrafiltration membrane and activated carbon are not used, the device can still achieve the purpose of sewage treatment, so that the cost is reduced, and the sewage treatment difficulty is also reduced; and the spray evaporator is matched with the causticizing device and the air flotation device, so that recycling of PTA, PET and liquid caustic soda is realized on the basis of treating impurities to the greatest extent.

Description

technical field [0001] The invention relates to a treatment device for dyed and finished liquid, in particular to a light alkali recovery and utilization device. Background technique [0002] The scientific name of PTA is terephthalic acid, which is white powder and reacts with EG (ethylene glycol) to produce PET (polyethylene terephthalate). Because PET is not resistant to alkali, PET will degrade in alkaline solution to produce PET oligomers and PTA. Therefore, when processing PET fabrics in the dyeing and finishing process, in order to increase the soft feel of PET fabrics, it is usually used in the production process. NaOH (caustic soda) treats the PET fabric, and the stripped PET oligomers and PTA are discharged into the sewage treatment station together with the waste lye. Due to the existence of PTA and PET oligomers, the COD (chemical oxygen demand) of the sewage will be caused. At the same time, PTA and PET oligomers are very difficult to degrade, so the cost of se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10D06B23/20C02F103/30
Inventor 孙德荣孙德明陆海明张堂标
Owner 徐州荣盛纺织整理有限公司