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Alkaline solvent with new type of removing phenol by liquid membrane extraction process

by:Deyuan      2020-08-30
Extractant A101 or N503 extraction agent has high ability of removing phenol in water solubility is small, a chemical plant in the process of coking wastewater, phenol phenol content is about 2000 mg/L, the waste water quantity of 11 m3 / h. The factory with N503 A101 or 5% - 5% Diesel ( 0) As extraction agent, using a vibration extraction tower and a reverse extraction tower to deal with wastewater containing phenol. Sieve plate extraction column diameter of 1. 1 m, the effective period of 5. 6 m, plate number for the 21st. Expanding period of 2 m diameter, high three. Expanding period under 4 m, 2 m diameter, high to 2. 5 m, enough to expand can guarantee a certain diameter and height of clarification period of time, prevent oil and water entrainment. Extraction tower were the effective diameter of 1. 8 m, the high is 3. 5 m, enlarge section diameter of 2. 8 m, the high of 2. 5m。 The process is similar to the benzene - Alkali dephenolizing process. Extraction temperature is about 50 ℃, the oil-water compared to 0. 8. After processing of waste water of phenol content is 300 mg/L. Steamed ammonia extraction raffinate send section deamination and then send to biochemical treatment, satisfies the requirement of biochemical treatment of the water. Half tower lye extraction tower ( 20%NaOH) Still, reverse extraction temperature is about 50 ℃, the extraction process is continuous flow, wrong lye recycling until after free alkali content lower than 5% to phenol liquid recovery section.
the process should be paid attention to in the process of running the main prevent extraction and reverse extraction process of emulsification phenomenon. Due to the existence of tar in wastewater, easy cause emulsification extraction process, so we must strictly control the tar content in the wastewater. In addition, A101 or N503 unstable product quality liquid easy cause operation layered process, the foam layer, causing emulsification phenomenon occurred. N503, A101 as dephenolizing solvent, the solvent loss rate in the energy level of a few parts per thousand.
centrifugal extraction machine dephenolizing process, our country began to research in the 1880 s. Practice has proved that the centrifugal extraction machine dephenolizing the whole process of the remnant of extractive dose is less than the same processing power tower equipment and retain 20% of the extractant, and the extraction efficiency is as high as 99. 9%. In equipment design, centrifugal extraction machine is more compact, get rid of the traditional large mechanical area wide, set of plant height has certain requirements. Emulsifying phenomenon, because of the large centrifugal extraction machine separation factor is very small. Late equipment loading and unloading, and the maintenance more convenient. On the phenol wastewater treatment, with good prospects.
somebody puts forward 'completely extraction wastewater containing phenol treatment technology, the technology is a closed circuit circulation process, can make full utilization, wastewater containing phenol in waste water of phenol removal rate reached 99. More than 9%, do not need the biochemical treatment, to achieve discharge standard. The proposed removing phenol by liquid membrane extraction method of study. Extraction and reverse extraction at the same time, removing phenol of high efficiency and superior to the traditional extraction method.
gao, tsinghua university developed a new type of extraction agent. The extraction agent, code-named DY - 2, the boiling point at 220 ~ 280 ℃, low toxicity, waste water processing in neighbouring nitrophenol 874 mg/L, the pH value of 3 ~ 4, still contains large amounts of sodium sulfate and nitrogenous organic compounds, DY - 2 as extraction agent, 15% NaOH solution as extraction agent. In lab for extraction process, phenol natrium fluid concentration can be increased by 10%, this part of phenol natrium can back to the production process. In the practice of the factory, the level 2 extraction, adjacent nitro phenol removal rate for 98. 6%, then through activated carbon adsorption, water containing neighbouring nitrophenol below 0. 5 mg/L, after lime neutralization, pH in 6 ~ 7, can be sent to the boiler factory pool recycled water film dust removal cycle.
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