Device and method for collecting nitrogen gas from cyclohexane oxidized tail gas
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A technology for oxidizing tail gas and cyclohexane, applied in chemical instruments and methods, inorganic chemistry, nitrogen compounds, etc., can solve the problems of waste of resources, waste of resources, environment, pollution, etc., achieve significant social and economic benefits, reduce emissions, The effect of reducing consumption
Active Publication Date: 2016-11-09
CHONGQING HUAFON CHEM +1
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[0006] However, the current cyclohexane air oxidation device has a large amount of oxidation tail gas, and direc
Method used
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Embodiment 1
[0061] use figure 1 process and figure 2 of the reactor.
[0062] Basic parameters:
[0063] In the oxidation tail gas of the cyclohexane air oxidation device, the volume concentration of nitrogen is 96.4%;
[0064] The temperature-swinging adsorbent is activated carbon;
[0065] The catalyst is dehydrogenation catalyst, there are low-temperature type and high-temperature type, and it is mixed packing;
[0066] The pressure swing adsorbent is activated carbon.
[0067] (1) Temperature swing adsorption, the operating conditions are as follows:
[0068] The temperature is 25°C, the residence time of the oxidation tail gas in the temperature swing adsorption device 1 is 14 hours, and the pressure is 0.9MPa;
[0069] (2) The weight ratio of temperature swing adsorption gas to compressed air is: temperature swing adsorption gas:compressed air=8:1;
[0070] (3) The mixed gas of the intermediate mixer 4 partially enters the heating device 5, is heated to a temperature of 230°...
Embodiment 2
[0081] use figure 1 process and figure 2 the reactor
[0082] Basic parameters:
[0083] In the oxidation tail gas of the cyclohexane air oxidation device, the volume concentration of nitrogen is 96.4%;
[0084] The temperature-swinging adsorbent is activated carbon;
[0085] The catalyst is dehydrogenation catalyst, there are low-temperature type and high-temperature type, and it is mixed packing;
[0086] The pressure swing adsorbent is a molecular sieve.
[0087] (1) Temperature swing adsorption, the operating conditions are as follows:
[0088] The temperature is 30°C, the residence time of the oxidation tail gas in the temperature swing adsorption device 1 is 16 hours, and the pressure is 1MPa;
[0089] (2) The weight ratio of temperature swing adsorption gas to compressed air is: temperature swing adsorption gas:compressed air=10:1;
[0090] (3) The mixed gas of the intermediate mixer 4 partially enters the heating device 5, is heated to a temperature of 210° C.,...
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Abstract
The invention provides a device and method for collecting nitrogen gas from cyclohexane oxidized tail gas. The device comprises a variable temperature adsorption device, a middle mixer, a heating device, a catalytic oxidation device and a variable pressure adsorption device which are connected in series sequentially through pipelines, wherein the variable temperature adsorption device is provided with a variable temperature adsorption agent layer; the middle mixer is provided with an air inlet connected with a compressed air source; the variable pressure adsorption device is provided with a variable pressure adsorption agent layer; the variable temperature adsorption device comprises a variable temperature adsorber which is provided with a variable temperature adsorption gas outlet and an oxidized tail gas inlet communicating with an inner cavity; the catalytic oxidation device comprises a catalytic oxygenizer provided with a catalyst bed layer; the catalytic oxygenizer is provided with a catalytic oxidation gas outlet and a variable temperature adsorption gas inlet communicating with the inner cavity of the catalytic oxygenizer; the variable temperature adsorption device comprises a variable temperature adsorber which is provided with a purified gas outlet and a catalytic oxidation gas inlet communicating with the inner cavity. The device and the method have the advantages that the nitrogen gas with the volume concentration being 99.9 percent or higher can be obtained; materials can be recovered; the consumption of public works is also reduced; meanwhile, the flare gas emission quantity is reduced.
Description
technical field [0001] The invention relates to a treatment device and a treatment method for cyclohexane oxidation tail gas. Background technique [0002] Cyclohexane is an important chemical intermediate, which can be oxidized to generate cyclohexyl hydroperoxide, and then decomposed to generate cyclohexanol and cyclohexanone. Both cyclohexanol and cyclohexanone are important chemical raw materials. Further production of caprolactam and nylon-66. [0003] At present, the non-catalytic air oxidation method of cyclohexane is the most popular method, replacing the oxygen-lean oxidation of cyclohexane. Compared with the oxygen-lean oxidation, the air oxidation method has the following advantages: [0004] The types and quantities of catalysts and chemicals needed are small, the process flow is relatively simple, the number of equipment is significantly reduced, the requirements for equipment materials are low, the total investment of the device is small, the operating pressu...
Claims
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