First tower for removing orthodichlorobenzene
A technology for a dichlorobenzene tower and a vacuum unit, which is applied in the chemical industry, can solve the problems of many impurities, large fluctuations in the pressure at the top of the tower, blockage of the cooler, the working fluid circulation pipeline and the inlet and outlet gas pipelines, etc., so as to reduce the maintenance cost. , the effect of reducing labor intensity
Inactive Publication Date: 2013-06-19
蓝星化工有限责任公司
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art, and provide a first ODCB removal tower, which solves the problem that the gas extracted from the top of the tower is entrained with more impurities, causing the vacuum unit's cooler, working fluid circulation pipeline, and inlet and outlet gas phase Serious pipeline blockage and large pressure fluctuations at the top of the tower
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[0017] Such as figure 1 As shown, the first off-o-dichlorobenzene tower includes tail gas condenser 1, front separation tank 20, vacuum unit 18, rear separation tank 15, gas phase pipe 12, front separation tank connecting tail gas condenser 1 and front separation tank 20 Intake pipeline 3, the vacuum unit air intake pipeline 7 connecting the front separation tank 20 and the vacuum unit 18, the vacuum unit exhaust pipeline 8 connecting the vacuum unit 18 and the rear separation tank 15, the connection rear separation tank 15 and the gas phase pipe 12 The rear separation tank exhaust pipeline 14 is equipped with control valves on each pipeline. The gas drawn in from the tail gas condenser 1 enters the front separation tank 20 through the front separation tank intake pipeline 3, and then enters through the vacuum unit intake pipeline 7. The vacuum unit 18, the gas discharged from the vacuum unit 18 enters the rear separation tank 15 through the vacuum unit exhaust pipeline 8, and...
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The invention discloses a first tower for removing orthodichlorobenzene, comprising a tail gas condenser, a front separation tank, a vacuum unit, a rear separation tank and a gaseous phase tube. Gas exhausted from the condenser enters the vacuum unit through the front separation tank and then enters the gaseous phase tube through the rear separation tank. The front and the rear separation tanks are provided with liquid discharge devices, hand holes and bypass pipelines. The invention has the advantages of solving the problems of blockage and frequent cleanness of the vacuum unit, reducing thelabor intensity of workers, reducing the overhaul expense and ensuring that a TDI (toluene diisocyanate) device can stably run for a long term.
Description
technical field [0001] The invention relates to the field of chemical industry, in particular to a first de-o-dichlorobenzene tower. Background technique [0002] Toluene diisocyanate (abbreviated as TDI) is an important raw material in the polyurethane industry. In the production of TDI, the first off-o-dichlorobenzene (abbreviated as ODCB) tower is one of the core equipment for the production of TDI equipment. In TDI production, whether the pressure of the first ODCB tower is stable or not directly affects the normal operation of the TDI unit; the fluctuation of the tower top pressure affects the balance of the tower, and finally affects the quality of TDI products. [0003] The gas drawn by the vacuum pump in the existing first ODCB tower from the tail gas condenser at the top of the tower directly enters the vacuum unit, and the exhaust gas from the separator directly enters the gas phase main pipe. Due to the large amount of impurities entrained in the gas extracted fr...
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IPC IPC(8): B01J19/00B01D49/00C07C265/14C07C263/20
Inventor 赵晋林张沛红刘天佐崔建帮郭泰兴
Owner 蓝星化工有限责任公司