Method for treating pure terephthalic acid refined wastewater
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A technology of purified terephthalic acid and refined wastewater, which is applied in the comprehensive utilization of purified terephthalic acid wastewater, industrial wastewater treatment, and the treatment of purified terephthalic acid wastewater. It can solve the impact of membrane system operation, membrane modules Damage and other issues
Active Publication Date: 2011-04-27
CHINA PETROLEUM & CHEM CORP +1
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After years of research on the wastewater, the biggest problem of the patent CN101134628A is in the reverse osmosis membrane separation unit, because the wastewater cont
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Embodiment 1
[0028] A petrochemical plant treats wastewater from a PTA production unit, with a treatment capacity of 5m 3 / h, the waste water is the waste water from the refining unit after separation of mother and solid, the water temperature is 55°C, and the indicators of various pollutants in the waste water are shown in Table 1:
[0029] The waste water is treated as follows:
[0030] 1) First, add sodium hydroxide (27%) to the waste water to make the pH of the waste water reach 4.2, so as to dissolve the tiny suspended particles in the waste water, so that the waste water meets the requirements for subsequent use of the resin unit;
[0031] 2) After pH adjustment, the waste water enters the resin adsorption unit, and macroporous alloy resin is used to remove cobalt and manganese metal ions in the waste water. The volume of the resin is 5m 3 , the flow rate of the resin adsorption column is controlled at 10BV, and after the resin unit runs for 72 hours, 4% hydrochloric acid is used fo...
Embodiment 2
[0038] A petrochemical plant PTA production plant wastewater, wastewater treatment capacity 3m 3 / h, the waste water is the waste water from the refining unit after separation of mother and solid, the water temperature is 52°C, and the indicators of various pollutants in the waste water are shown in Table 2:
[0039] The waste water is treated as follows:
[0040] 1) First, add sodium carbonate (20%) to the waste water to make the pH of the waste water reach 4.8, so as to dissolve the tiny suspended particles in the waste water, so that the waste water meets the requirements for subsequent use of the resin unit;
[0041] 2) The wastewater after adjusting the pH enters the resin adsorption unit, and ion exchange resin is used to remove cobalt and manganese metal ions in the wastewater. The volume of the resin is 4m 3 , the flow rate of the resin adsorption column is controlled at 18BV, and after the resin unit runs for 60 hours, 5% hydrobromic acid is used for elution and rege...
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Abstract
The invention discloses a method for treating pure terephthalic acid refined wastewater, which relates to the field of comprehensive treatment of industrial sewage. The method comprises the following steps of: 1. adjusting a pH value of the refined wastewater to 4 to 5 to dissolve fine suspended solids in the refined wastewater; 2. conveying the refined wastewater into a resin adsorbing unit to remove cobalt and manganese ions in water; after running the resin adsorbing unit for certain time, regenerating and recycling the cobalt and manganese ions; 3. carrying out first-stage reverse osmosis membrane treatment on the refined wastewater, carrying out second-stage reverse osmosis membrane treatment on treated producing water and draining the concentrated water into a sewage treatment plant; and 4. carrying out second-stage reverse osmosis membrane treatment on the producing water subjected to the first-stage reverse osmosis membrane treatment, returning the treated producing water to a production device system and returning the concentrated water to a first-stage reverse osmosis membrane water inlet. The method of the invention recycles the cobalt and manganese ions in the refined wastewater as by products, carries out purification treatment on the refined wastewater, recycles most of wastewater as production process water for recycling and achieves the aim of carrying out comprehensive utilization on the refined wastewater.
Description
technical field [0001] The invention relates to the field of comprehensive treatment of industrial sewage, in particular to a method for comprehensive utilization of purified wastewater from purified terephthalic acid, which belongs to a method for treating industrial wastewater, and in particular to a method for treating purified wastewater from purified terephthalic acid. Background technique [0002] Purified terephthalic acid (PTA) is an important petrochemical product, which is mainly used as a raw material for the production of polyester in industry. Its main production method is to generate crude terephthalic acid by oxidizing p-xylene with acetic acid as a solvent under the action of cobalt acetate, manganese acetate and tetrabromoethane catalysts, and then carry out hydrogenation refining on crude terephthalic acid , remove impurities, and make products after separation and drying. [0003] In the above production process, the refining unit is the main drainage uni...
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