Device and method for recovering trimellitic anhydride from residual liquid in trimellitic anhydride rectifying tower kettle
A trimellitic anhydride and recovery device technology, which is applied in boiler/distillate distillation, fractional distillation, vacuum distillation, etc., can solve the problems of trimellitic anhydride yield decrease, affect the production efficiency of rectification tower, affect economic benefits, etc., and achieve the reduction of solid waste treatment The effect of pressure, improving recovery rate and increasing product yield
Pending Publication Date: 2020-08-18
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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Problems solved by technology
[0002] At present, during the continuous distillation process of the trimellitic anhydride distillation tower, the temperature of the tower bottom is getting higher and higher, and it is necessary to discharge the residual liquid of the tower bottom intermittently, otherwise the production efficiency of the distillation tower will be affected.
After the raffinate was discharged, because the raffinate was not effectively distilled, a large amount of trimellitic anhydride was not effectively recovered in the raffinate, which not only caused a decrease in the yield of trimellitic anhydride, but also produced a large amount of extra Solid waste not only affects economic benefits, but also has a certain impact on the environment
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[0046] Such as figure 1 As shown, the present invention specifically discloses a recovery device for trimellitic anhydride in the residual liquid of a trimellitic anhydride rectification tower, including a recovery kettle 20, a trimellitic anhydride rectification tower 27, a raffinate collection kettle 21, a rectification tower condenser 22, and a nitrogen storage tank 23. Low-temperature oil tank 24, hot oil furnace 25 and vacuum pump 26. The upper end of the recovery kettle is provided with a gaseous trimellitic anhydride outlet 1, a raffinate feed inlet 2, a vacuum port 3 and a nitrogen filling port 4. The right side of the recovery kettle is provided by the upper The bottom is provided with a heat transfer oil inlet 5 and a cooling oil inlet 6 in turn, and the left side of the recovery kettle is provided with a heat transfer oil outlet 7 and a cooling oil outlet 8 in turn from top to bottom, and the lower end of the recovery kettle is provided with a slag discharge port 9; ...
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The invention relates to the field of material recovery. The invention relates to a recovery device and method for trimellitic anhydride, and particularly discloses a device and a method for recovering trimellitic anhydride in trimellitic anhydride rectifying tower kettle raffinate. The device comprises a recovery kettle, a trimellitic anhydride rectifying tower, a residual liquid collecting kettle, a rectifying tower condenser, a nitrogen storage tank, a low-temperature oil tank, a hot oil furnace and a vacuum pump. The method includes: pumping the residual liquid of the trimellitic anhydriderectifying tower into a recycling kettle to distill, extracting and recycling trimellitic anhydride. According to the invention, the recovery kettle has enough time to recover trimellitic anhydride in the residual liquid of the trimellitic anhydride rectifying tower; the two recovery kettles are switched for use, so that the operation is more stable and efficient, the recovery rate of trimelliticanhydride is effectively increased, the product yield is increased, the generation of solid waste can be reduced, the solid waste treatment pressure is greatly reduced, and the related requirements of environmental protection are better satisfied.
Description
technical field [0001] The invention relates to the field of material recovery, in particular to a device and method for recovering trimellitic anhydride in the residual liquid of a trimellitic anhydride distillation tower. Background technique [0002] At present, during the continuous distillation process of the trimellitic anhydride distillation tower, the temperature of the tower bottom is getting higher and higher, and it is necessary to discharge the residual liquid of the tower bottom intermittently, otherwise the production efficiency of the distillation tower will be affected. After the raffinate was discharged, because the raffinate was not effectively distilled, a large amount of trimellitic anhydride was not effectively recovered in the raffinate, which not only caused a decrease in the yield of trimellitic anhydride, but also produced a large amount of extra Solid waste not only affects economic benefits, but also has a certain impact on the environment. [000...
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IPC IPC(8): B01D3/30B01D3/10C07D307/89B01D3/02
CPCB01D3/30B01D3/10C07D307/89B01D3/02
Inventor 蒋国强孙百亚夏海峰吴晓明赵跃周国君万鹏梁国成张晓
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD