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No pollution treatment technique for residue of refined terephthalic acid thin-film evaporator

A technology of purified terephthalic acid and thin-film evaporator, which is applied in water/sewage treatment, water/sludge/sewage treatment, centrifuged water/sewage treatment, etc. It can solve the problem of non-recyclable waste water, high cost, and land occupation. Large area and other problems, to achieve the effects of small footprint, closed loop, and low process cost

Inactive Publication Date: 2007-02-07
江苏福昌环保科技集团有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a non-polluting treatment process for residues of purified terephthalic acid thin-film evaporators so that the treated wastewater It can be recycled and used as process water to realize the clean production of closed water circulation and no sewage discharge in PTA production

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  • No pollution treatment technique for residue of refined terephthalic acid thin-film evaporator

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Embodiment Construction

[0014] Such as figure 1 The shown clean terephthalic acid film evaporator residue pollution-free treatment process of the present invention has the following process steps:

[0015] a. Cooling: The waste liquid discharged from the thin-film evaporator is free to settle at 70°C to 90°C to separate terephthalic acid and recover it, and then the separated waste liquid is cooled to 10 ℃~50℃;

[0016] b. Separation: The cooled waste liquid is separated with a filter press, and the separated solid residue is directly bagged and sent to the treatment plant. The solid residue is treated with the "Pure Terephthalic Acid Residue Treatment Method" disclosed by Chinese patent CN1089365C Carry out comprehensive utilization and incineration treatment, the filtrate enters the storage tank, and is recycled as the beating water for the residue of the thin film evaporator. As the number of wastewater cycles increases, the content of cobalt and manganese in the wastewater gradually increases. W...

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Abstract

This invention involves a wastewater treatment technology, in particular to a no pollution treatment process for residues from the film evaporator of purified terephthalic acid. The technology comprises: (1) cooling the waste liquid discharged directly from the film evaporator to 10-50DEG C, or precipitating and separating terephthalic acid at 70-90DEG C before cooling, and (2) separating the waste liquid by using a filter press or centrifuge, sending the solid residues (including cobalt and manganese) bagged to the treating plant directly, comprehensive-utilizing and incinerating, reclaiming cobalt and manganese from sinter and placing the filtrate into the tank as recycling water for pulping in the film evaporator. The invention has low cost and small size. The wastewater can be recycled as process water. Therefore a terephthalic acid production with a closed water cycle and no wastewater discharge is realized.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a non-pollution treatment process for the residue of a thin film evaporator of purified terephthalic acid. Background technique [0002] Purified terephthalic acid (referred to as PTA) is the basic raw material for the production of polyester fiber and PET resin, and its chemical oxygen demand (COD) load during the production process is as high as 5-15kg / m 3 of organic wastewater. The composition of PTA wastewater is very complex, the main pollutants include terephthalic acid, acetic acid and benzoic acid, among which terephthalic acid is a teratogenic and toxic biorefractory organic matter, and the production of PTA continues to expand, so the treatment of PTA production wastewater Work is also becoming more pressing. [0003] The usual treatment method for PTA production wastewater is to first pass through a candle filter to recover a part of suspended terephtha...

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Application Information

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IPC IPC(8): C02F1/00C02F1/52C02F1/38F23G7/00
Inventor 沈福昌沈建东沈晓东
Owner 江苏福昌环保科技集团有限公司
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