Coal liquefaction iron-base catalyst, preparation method thereof and method for improving yield of coal liquefaction oil

Abstract

The invention provides a coal liquefaction iron-base catalyst, a preparation method thereof and a method for improving yield of coal liquefied oil. The method for improving the yield of coal liquefied oil comprises the following steps: uniformly mixing a coal sample with required amount, coal liquefied iron-based catalyst and filtrate in a high pressure reaction kettle to react with H2 at 5 to 7MPa; cooling the reaction kettle to room temperature to obtain a reaction product; and extracting solid phase and liquid phase of the liquefied product by normal hexane, toluene and tetrahydrofuran in sequence by a Soxhlet extractor to separate oil, asphaltene, preasphaltene and liquefaction residuals respectively. The method still can obtain high oil yield when coal liquefaction is carried out under lower temperature and lower pressure so as to reduce the production cost, in particular coal varieties which have high content of inertinite compositions, low hydrogen carbon ratio and low volatilematter and is difficult to be qualified, such as new coal of Wucaiwan in Xinjiang.

Description

technical field [0001] The invention relates to the technical field of direct coal liquefaction, and relates to an iron-based catalyst for coal liquefaction, a preparation method thereof and a method for increasing the yield of coal liquefaction oil. Background technique [0002] Wucaiwan Coal Mine is located in the Zhundong region of Xinjiang. It is the first of the five major coal power and coal chemical industry bases in Xinjiang. It is about to be built into the largest open-pit coal mine in the world. The coal quality analysis of Wucaiwan new coal in Xinjiang is shown in Table 1. Its coal quality characteristics can be summarized as "three highs" (high moisture, high oxygen, and high inertinite content) and "three lows" (extra-low ash to low medium ash, ultra-low sulfur, and low hydrogen-to-carbon ratio). According to the national standard for coal classification (GB5751-86), this coal belongs to bituminous coal with a high degree of coalification. [0003] Coal direc...

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Problems solved by technology

[0009] In the above-mentioned prior art, there are still the following problems: the oil yield of coal liquefaction is low, and the conditions such as temperature and pressure required in the coal liquefaction process are relatively high, resulting in high cost

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