A method for recovering tail hydrogen of a disproportionation and transalkylation unit
A technology for transalkylation and recovery methods, applied in chemical instruments and methods, hydrogen separation, inorganic chemistry, etc., can solve the problem that tail hydrogen cannot be effectively recovered and run costs, and achieves reduction of hydrogen consumption, avoidance of accumulation, and significant economic benefits. Effect
Active Publication Date: 2022-04-05
SINOPEC GUANGZHOU ENG CO LTD +1
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[0007] The purpose of the present invention is to provide a new recovery method for tail hydrogen in disproportionation and transalkylation devices in view of the disadvantages of the existing technology that the tail hydrogen cannot be effectively recovered and the operating cost of the device is high.
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[0022] Such as figure 1 and figure 2 As shown, a method for recovering tail hydrogen of a disproportionation and transalkylation unit adopts a combined process of continuous reforming unit recontact system and PSA to recover tail hydrogen of a disproportionation and transalkylation unit. The disproportionation and transalkylation unit 1 uses the high-purity hydrogen 2 of the PSA unit 7 as supplementary hydrogen. After the disproportionation and transalkylation reaction, the circulating hydrogen in the disproportionation and transalkylation unit 1 is reduced to a hydrogen content of 70-85% (volume percentage) When the flow control valve is adjusted, a certain amount of high-purity hydrogen 2 is supplemented. The supplementary amount is the total amount of hydrogen consumption and tail hydrogen (according to hydrogen content) of the disproportionation and transalkylation unit. (Low score) Under the regulation of the pressure control valve, a certain amount of tail hydrogen 3 (...
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The invention discloses a method for recovering tail hydrogen of a disproportionation and transalkylation device, in order to solve the shortcomings of the prior art that the tail hydrogen cannot be recovered effectively and the operation cost of the device is high. The method is: the tail hydrogen from the disproportionation and transalkylation unit is led to the inlet or outlet of the final stage air cooler or water cooler of the reforming hydrogen compressor, or to the penultimate stage air cooler or water cooler of the reforming hydrogen compressor The inlet or outlet is mixed with the compressed gas that has passed through the reforming hydrogen compressor, and then it is in contact with the reformed oil, and then enters the recontact refrigerator for cooling and the final stage recontact tank for gas-liquid separation, and the separated liquid phase is passed through After recovering the cooling capacity, it returns to the upper contact tank or enters the product separation unit. The separated gas phase is used as the raw material gas of the pressure swing adsorption device, or part of it is used as supplementary hydrogen, and the other part is used as the raw material gas of the pressure swing adsorption device to obtain high-purity hydrogen.
Description
technical field [0001] The invention belongs to the field of petrochemical industry and relates to a method for recovering tail hydrogen of a disproportionation and transalkylation device. Background technique [0002] Hydrogen is a very precious resource for refining and chemical enterprises. Therefore, the efficient recovery and utilization of by-product hydrogen-rich tail gas in the production process of refining and chemical equipment is the continuous attention and attention of domestic and foreign scientific and technological personnel. At present, the hydrogen in the tail gas of refining and chemical units is usually recovered by membrane separation method, pressure swing adsorption (PSA) method or cryogenic separation method, among which the PSA method is more commonly used. [0003] Qu Guohua, Discussion on the low-cost strategy of hydrogen used in refineries, Petrochemical Technology Economics [J], 2007(2):19~21. It is mentioned that the PSA method is an important...
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IPC IPC(8): C01B3/52C01B3/56
CPCC01B3/52C01B3/56C01B2203/048Y02P20/10
Inventor 徐又春孙秋荣郭劲鹤李爱国董海芳
Owner SINOPEC GUANGZHOU ENG CO LTD