Recycling process and recycling system for purified water in methanol-to-olefin process
A methanol-to-olefins and water purification technology, applied in the field of water treatment, can solve the problems of high operating consumption and sewage discharge, inability to remove oily substances, and low filtration accuracy, and achieve long operation cycle, high degree of automation, and high filtration accuracy Effect
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Embodiment 1
[0078] Use image 3 The process flows of the process flow for methoxyl olefin process purifying water, the methanol olefin process purified water temperature 40 ° C, solid content of 18 mg / L, oil content 3 mg / L, under the promotion of the microbubble generator, mixed with nitrogen, Form a tiny bubble, enter the KMPR filter, after suction of the water pump, produce clean water, and partially produced to the anti-washing tank. The KMPR filter is a normal pressure vessel. After mixing with the feed, the fine bubbles carry the oil droplets gradually float to the surface of the membrane filter, and gradually form an oil film, and the surface oil film passes the regular squeegee or overflow. Outside the substance discharge system, to the sewage treatment plant. The concentrating contains a large amount of concentrated suspension and oil substance, and mix the floating state in the filter by the bottom aeration device.
[0079] 20 times, concentrated liquid and oil residue enter the ...
Embodiment 2
[0084] Use figure 2 The process flow of the process is treated with the methanol olefin process purification water, the methanol olefin process purified water temperature 37 ° C, solid content of 10 mg / L, oil content 1 mg / L, purified water into the KMPR filter, pumping the water pump Available water, partial water is delivered to the anti-washing tank. After the anti-washed tank reaches high level, the water is reused to olefin separation system. The concentrating contains a large amount of concentrated suspension and oil substance, and mix well in the filter through the bottom aeration device. 10 times, concentrating liquid and oil residue enter the sewage treatment plant. The membrane filter system water pump is 60 min, stops 1min, continuous feed, continuous aeration, and continuous discharge fluid. 100s anti-washing per 150min, regular chemical cleaning.
[0085] The filtrate quality and water recovery are shown in Table 2:
[0086] Table 2
[0087] Filtrate NT...
Embodiment 3
[0089] Use figure 2 The process flows of the process process to treat the methanol olefin process purification water, methanol olefin process purified water temperature 40 ° C, solid content 30 mg / L, oil content 5 mg / L, purified water and compressed air pass the microbubble generator into the KMPR filter Clean water under the suction of the water pump, partially produced to the anti-washing tank, and the water tank reaches a high level, water is produced. The concentrating contains a large amount of concentrated suspension and oil substance, and the concentrating liquid in the filter is uniformly retain the suspension in the filter through the bottom aeration device. 10 times, concentrating liquid and oil residue enter the sewage treatment plant. The membrane filter system water pump is 60 min, stops 1min, continuous feed, continuous aeration, and continuous discharge fluid. 50S counter-washing per 100min, 1 chemical cleaning per month.
[0090] The filtrate quality and water ...
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