Method for recycling purified terephthalic acid wastewater

A technology for purifying terephthalic acid and terephthalic acid, which is applied in the field of wastewater treatment and reuse, can solve the problems of not considering precious metal catalyst ions, not considering the reuse of metal ions, and the process is difficult to operate stably, so as to reduce the load and extractant dosage, convenient operation and management, and large operation flexibility.

Pending Publication Date: 2021-07-13
新疆中泰创新技术研究院有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN108367944A discloses a kind of adopting ion exchange process to treat PTA waste water: first adjust the pH value of waste water with alkaline solution, then use non-ionic polystyrene resin to filter aromatic carboxylic acid from PTA waste water for reuse, but this method The reuse of metal ions in the wastewater is not considered; CN204369620U discloses an electrolytic catalytic oxidation method to treat PTA wastewater, which mainly utilizes the principle of electrolysis of molecular currents under an electrostatic magnetic field to decompose macromolecular organic matter in wastewater into small molecular products , so that the waste water can reach the discharge standard
However, this technology does not consider the recovery of useful precious metal catalyst ions in sewage, resulting in a waste of resources; moreover, the dual-membrane system composed of ultrafiltration-reverse osmosis has harsh water inlet conditions, and the process is difficult to operate stably

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  • Method for recycling purified terephthalic acid wastewater
  • Method for recycling purified terephthalic acid wastewater
  • Method for recycling purified terephthalic acid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The production capacity of a PTA plant is 120wt / a, and the oxidation residue wastewater comes from the redox section of the PTA production process; the reaction conditions are: 1.15MPaG; 189°C. Wastewater volume: 10m 3 / h; the method for resource utilization of the oxidation residue wastewater comprises the following steps:

[0055] 1) First, send the oxidation residue wastewater from the PTA unit to the wastewater storage tank, and lower the temperature of the wastewater to 30-45°C, and use dilute sulfuric acid to adjust the pH value of the wastewater to 2.5-4.5. Under this condition, the waste water Aromatic carboxylic acids such as terephthalic acid will be precipitated;

[0056] 2) Add polyacrylamide to the waste water, mix it uniformly and let it stand for 1.0 h to gather the precipitated aromatic carboxylic acid, wherein the amount of polyacrylamide added is 0..05wt% of the waste water mass;

[0057] 3) Pump the settled waste water into the micron filter (the mi...

Embodiment 2

[0067] The production capacity of a PTA plant is 120wt / a, and the oxidation residue wastewater comes from: the redox section of the PTA production process; the reaction conditions are: 1.15MPaG, 187°C, and the wastewater volume is: 9.5m 3 / h; the method for resource utilization of the oxidation residue wastewater comprises the following steps:

[0068] 1) First, the oxidation residue wastewater from the PTA unit is sent to the wastewater storage tank, and the temperature of the wastewater is lowered to 35°C, and the pH value of the wastewater is adjusted to 3.0 with dilute sulfuric acid. Under this condition, the p-benzene in the wastewater Precipitation of aromatic carboxylic acids such as dicarboxylic acid;

[0069] 2) Add polyacrylamide to the waste water, mix it uniformly and let stand for 1.5h to flocculate the precipitated aromatic carboxylic acid, wherein the amount of polyacrylamide added is 0.1wt% of the waste water mass;

[0070] 3) Pump the settled waste water into...

Embodiment 3

[0080] The production capacity of a PTA plant is 120wt / a, and the oxidation residue wastewater comes from: the redox section of the PTA production process; the reaction conditions are: 1.15MPaG, 187°C, and the wastewater volume is: 11m 3 / h, the method for resource utilization of the oxidation residue wastewater comprises the following steps:

[0081] 1) Firstly, the oxidation residue wastewater from the PTA unit is sent to the wastewater storage tank, and the temperature of the wastewater is lowered to 30°C, and the pH value of the wastewater is adjusted to 2.5 with dilute sulfuric acid. Under this condition, the terephthalate in the wastewater Precipitation of aromatic carboxylic acids such as formic acid;

[0082] 2) Add a polyacrylamide flocculant to the wastewater, mix it uniformly and let it stand for 2.0 hours to flocculate the precipitated aromatic carboxylic acid, wherein the amount of the polyacrylamide added is 0.2wt% of the wastewater mass

[0083] 3) Pump the set...

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Abstract

The invention discloses a method for recycling purified terephthalic acid wastewater. The method comprises the following steps: providing purified terephthalic acid wastewater, adjusting the temperature of the purified terephthalic acid wastewater to 30-45 DEG C, adjusting the pH value of the purified terephthalic acid wastewater to 2.5-4.5, and filtering the purified terephthalic acid wastewater to obtain a filtrate and a first solid which contains aromatic carboxylic acid; feeding the filtrate into an extraction system for extraction treatment to obtain an extraction phase and a raffinate phase; feeding the extraction phase into a rectifying tower, performing regeneration treatment to obtain a second solid matter containing aromatic carboxylic acid, feeding the raffinate phase into an ion exchange system, and performing ion exchange treatment; and carrying out desorption treatment on ion exchange resin in the ion exchange system to obtain cobalt and manganese ions. According to the method provided by the invention, recovery treatment of organic carboxylic acid and metal ions in the PTA wastewater is comprehensively considered, and the treatment load of a downstream section is remarkably reduced while effective recycling of resources is realized.

Description

technical field [0001] The invention particularly relates to a method for resource utilization of purified terephthalic acid wastewater, which belongs to the technical field of wastewater treatment and reuse. Background technique [0002] Purified terephthalic acid (PTA for short) is an important organic chemical raw material, mainly used in the production of polyethylene terephthalate (PET for short), and further production of synthetic resin, polyester fiber, etc. The typical production process of PTA is divided into two steps. The first step is the PX oxidation unit, and the second step is the TA refining unit. Since water is used as a solvent in the terephthalic acid (TA) refining process, a certain concentration of organic wastewater will be produced. The composition of the wastewater is complex, in addition to containing a large amount of terephthalic acid, benzoic acid, and isophthalic acid, it also contains metal ions such as cobalt and manganese. The COD content of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C07C51/42C07C63/26C01G51/00C01G45/00C02F101/20C02F101/34C02F103/36
CPCC02F9/00C07C51/42C01G51/003C01G45/003C02F1/66C02F1/26C02F1/42C02F1/048C02F1/56C02F1/444C02F2103/36C02F2101/34C02F2101/20C02F2101/203C02F2209/06C02F2209/02C07C63/26
Inventor 何洋谭瀚茗姚元宏黄金锋田军超牛雪涛郭彦斌焦态成
Owner 新疆中泰创新技术研究院有限责任公司
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