Method for reclaiming methanol in saccharin wastewater by continuous rectification method
A rectification method and methanol technology, which is applied in the field of methanol recovery from saccharin wastewater by continuous rectification method, can solve the problems of shortening the service life of equipment, affecting the progress of production, and small amount of wastewater treatment, so as to reduce scaling and benefit Production and energy saving effects
Active Publication Date: 2013-03-20
CHINA PINGMEI SHENMA GRP KAIFENG XINGHUA FINE CHEM
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Problems solved by technology
This batch rectification method not only consumes a lot of energy, has a small amount of waste water treatment, and a low recovery rate, but also, the equipment reboiler and shell-and-tube condenser used in the batch rectification are prone to fouling during use, and the descaling Not only waste money, shorten the service life of equipment, but also affect the progress of production
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[0014] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0015] Referring to accompanying drawing, the inventive method comprises following process step:
[0016] Manually open the intake steam valve of the rectification tower still 4, inject steam into the rectification tower still 4, and observe the temperature changes in each stage of the tower still in the temperature control room of the operation room, when the tower still The temperature is in the balance of bottom temperature, middle temperature and upper temperature. When the temperature is 80-110℃, the intake steam valve is switched to automatic state. At this time, manually start the feed pump 2 and manually adjust the flow rate to 3-12m 3 / h, the saccharin waste water feed liquid containing methanol flows into the heat exchanger 3 for heat exchange, and the saccharin waste water feed liquid containing methanol that is preheated and heated...
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The invention discloses a method for reclaiming methanol in saccharin wastewater by continuous rectification method. The method can realize automatic control of continuous feed, continuous preheating for temperature rise, continuous rectification for methanol reclamation and continuous discharge of waste liquid by using the continuous rectification method in a process of reclaiming the methanol in the saccharin wastewater, saves time and labor, can obtain reclaimed methanol with stable quality, has high reclamation rate, and can reclaim about 40 tons of methanol every day. The waste hot liquid generated in the process of reclaiming the methanol is reused for heat exchange so that the waste is fully utilized, the consumption of steam can be greatly reduced and the energy can be saved. Because an evaporative condensation mode is adopted, the using amount of the condensed water can be greatly reduced, and the scaling phenomenon of equipment can be relieved. Therefore, the method can prolong the service life of the equipment and reduce equipment investment, and is favorable for normal operation of production.
Description
technical field [0001] The invention relates to a method for recovering methanol from saccharin wastewater, in particular to a method for recovering methanol in saccharin wastewater by continuous rectification. Background technique [0002] During the production of saccharin, an alkaline waste water is produced, which contains about 10% methanol. The methanol in the waste water can only be recovered from the waste water by means of rectification. Usually, the method of batch rectification is adopted to recover methanol from saccharin waste water through the processes of feeding into rectification tower, heating, distillation, extraction of low content and rectification. This batch rectification method not only consumes a lot of energy, has a small amount of waste water treatment, and a low recovery rate, but also, the reboiler and the shell-and-tube condenser used in the batch rectification are prone to fouling during use, and the descaling Time not only waste money, short...
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IPC IPC(8): C07C31/04C07C29/80
Inventor 杨国新齐枫楠程广宇袁宏祝新红齐化多王治江吴国宏李薇
Owner CHINA PINGMEI SHENMA GRP KAIFENG XINGHUA FINE CHEM