A kind of CO-containing purified terephthalic acid tail gas pressure swing adsorption method for extracting H2
A purified terephthalic acid, pressure swing adsorption technology, applied in separation methods, chemical instruments and methods, methane capture, etc., can solve the problem that the CO conversion catalyst is easy to deactivate, the hydrogen purity or yield is low, and the CO conversion temperature is high. problems, to achieve the effects of stable device, simple method and low energy consumption of the device
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Embodiment 1
[0033] Such as figure 1 Shown, a kind of CO-containing purified terephthalic acid tail gas PSA extracts the method for H2, carries out following operation successively:
[0034] (1) Initial purification:
[0035] After the tail gas from the PTA production process is mixed, its typical components are: water: 85% (v / v, the same below); H2: 13%; N2: 0.6%; CO: 0.3%; CO2 : 0.2%; O2: 0.01%, others, including VOCs, methane, etc.: 0.69%; tail gas pressure is greater than 2.0MPa, temperature is greater than 200~250℃, and the flow rate is 3,000Nm3 / h. Thus, the raw material gas of PTA tail gas is formed and enters this process. The PTA tail gas pressure is first stabilized to 2.0MPa (the pressure requirement of the hydrogen product is 2.0MPa). Entering two evaporators respectively, the water vapor content in the raw material gas is relatively large. In order to recover this part of heat, the raw material gas is cooled by boiler water, and 0.5MPa saturated water vapor is produced by-pr...
Embodiment 2
[0045] Such as figure 2 As shown, on the basis of Example 1, a method for extracting H by pressure swing adsorption of CO-containing purified terephthalic acid tail gas, the composition and feed conditions of the CO-containing hydrogen-rich raw material gas entering the PSA system are unchanged , The PSA system is composed of 4 towers connected in parallel, using 4-1-1V mode for PSA cycle operation, that is, 1 tower is always in the adsorption state, and the other 3 towers are in each step of desorption, and the pressure is equalized once. In order to prevent the mass transfer efficiency of the adsorption-desorption cycle process from being affected by excessive pressure changes in the system, and the excessive pressure difference may also cause pulverization of the adsorbent due to excessive pressure stress, between the adsorption towers On the pressure equalization pipeline, a regulating valve and a program control valve are added in parallel to control the pressure equaliz...
Embodiment 3
[0047] Such as figure 1 Shown, on the basis of embodiment 1, a kind of CO-containing purified terephthalic acid tail gas pressure swing adsorption extracts the method for H2, and described each tail gas produced in the PTA production process and other petrochemical products produce Exhaust gas, such as coke oven gas, after mixing, its typical components are, water: 80% (v / v, the same below); H2: 15%; N2: 0.6%; CO: 0.6%; CO2: 0.2 %; O2: 0.01%, others, including VOCs, methane, etc., are 2%. Among them, in addition to various organic acids contained in PTA tail gas in VOCs, coke oven gas also contains benzene, naphthalene, H2S, etc. After mixing The raw material gas has a pressure greater than 2.0MPa, a temperature greater than 200-250°C, and a flow rate of 3,000Nm3 / h, thus forming the raw material gas of this embodiment and entering the preliminary purification process. The difference from the preliminary purification process in Example 1 is that in the original process, a benz...
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