Pretreatment method of coal hydrogenation liquefaction iron-based catalyst
A coal hydrogenation liquefaction, liquefaction iron-based technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., to reduce costs, stabilize free radicals, and improve conversion. rate effect
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[0068] The present invention is described below through examples, but the present invention is not limited thereto. And the reagents and materials used in the examples can be obtained from commercial sources unless otherwise specified.
[0069] In the following examples, the coal hydroliquefaction performance of the pretreated iron-based catalysts obtained in the examples and the iron-based catalysts of the comparative example was evaluated with coal A. The coal quality analysis is shown in Table 1. The coal hydroliquefaction reaction conditions are shown in Table 2 below.
[0070] Table 1. Properties of Raw Coal A
[0071]
Embodiment 1
[0078] Example 1: Coal hydroliquefaction reaction catalyzed by C1.
[0079] Catalyst C1 uses the catalyst D1 described in Comparative Example 1 as a fresh iron-based catalyst, and this fresh catalyst adopts the following steps to carry out pretreatment:
[0080] Stir and mix 125g of fresh catalyst D1 and 500g of hydrorefined oil as a deep-processed product of coal liquefaction products in a pretreatment reactor to prepare a pretreatment mixture, wherein the content of catalyst D1 is 20wt%.
[0081] Feed N into the pretreatment reactor 2 Gas to replace the air in the pretreatment reactor. After the replacement is completed, adjust the airflow pressure to 5MPa. Turn on the temperature control system, raise the temperature to 220°C at a rate of 0.5°C / min, and switch the pretreatment airflow to H 2 S concentration is 7.5vol% of H 2 S / H 2 The mixed gas is then pretreated at a constant temperature of 220°C for 4 hours, and then the temperature is raised to a final temperature o...
Embodiment 2
[0083] Example 2: Coal Hydroliquefaction Catalyzed by C2
[0084] Catalyst C2 uses the Fischer-Tropsch synthesis waste catalyst as a fresh iron-based catalyst, and the fresh catalyst is pretreated by following steps:
[0085] Stir and mix 500 kg of a mixture containing 48 wt % spent Fischer-Tropsch synthesis catalyst and 1500 kg of Fischer-Tropsch synthesis heavy wood in a pretreatment reactor to obtain a pretreatment mixture, wherein the content of the spent Fischer-Tropsch synthesis catalyst is 12 wt %.
[0086] Nitrogen is fed into the pretreatment reactor to replace the air in the pretreatment reactor. After the replacement is completed, adjust the gas flow pressure to 2.2MPa. With a single heating rate of 0.1°C / min, the temperature of the pretreatment mixture in the reactor was continuously raised to a final temperature of 280°C. Switch the pretreatment gas flow to hydrogen, add CS 2 , to adjust the H of the preconditioning airflow 2 The S concentration was increased ...
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