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Method for preparing liquid hydrocarbons by gentle hydropyrolysis of coal

A technology for hydropyrolysis and liquid hydrocarbons, which is applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems of inability to apply on an industrial scale, low oil yield, and inability to operate liquid hydrocarbon yields, etc. The effect of low operating costs, high oil yield and mild reaction conditions

Active Publication Date: 2019-04-02
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] It can be seen that in the previously disclosed methods of direct coal hydrogenation conversion, if the purpose of producing liquid fuels is to pursue a higher yield of liquid hydrocarbons, it is undoubtedly necessary to use harsh reaction conditions (such as in Chinese invention patent ZL200610070581.1 Need carbonization at 600-1200°C, etc.) or need to use cumbersome processes and expensive catalysts to increase the yield of liquid hydrocarbons (for example, the highest conversion rate reported in Chinese invention patent ZL200480035693.2 is 81% under harsh reaction conditions ; Chinese invention patent ZL201010192050.6 reports that the conversion rate under severe reaction conditions is 50.5%-81.8%, and the oil+gas yield is 31.5%-62.0%); at the same time, the inventor has found through research that if the above process When implemented under relatively mild reaction conditions, there is the problem that the above-mentioned process cannot be operated or the yield of liquid hydrocarbons (that is, the oil yield) is too low
Moreover, most of the currently disclosed methods of coal temperature and direct hydrogenation conversion are still in the laboratory research stage, and cannot be applied on an industrial scale

Method used

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  • Method for preparing liquid hydrocarbons by gentle hydropyrolysis of coal
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  • Method for preparing liquid hydrocarbons by gentle hydropyrolysis of coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] The lignite is ground into powder using a ball mill, and passed through a 200-mesh sieve to obtain coal powder with a particle size below 200 mesh. Before the operation of the device, the mixed crude oil, normal side oil, constant top oil, reduced side oil and coker heavy oil obtained in the following Example 5 were subjected to mixed hydrotreating and upgrading, and the distillation range obtained was between 220 ° C and 550 ° C. The oil in the range of ℃ is used as solvent oil; during the operation of the device, the mixed crude oil, normal side oil, constant top oil, reduced side oil and coking heavy oil obtained in this example are mixed and hydrogenated to obtain Oil products with a distillation range of 220°C-550°C are used as solvent oil; pyrrhotite is used as a catalyst; sulfide is used as an additive.

[0111] The above-mentioned coal powder, solvent oil, catalyst and additives are uniformly mixed in a mass ratio of 100:600:1:5 to obtain a highly dispersed oil-...

Embodiment 2

[0119] Except for the following adjustments, other reaction processes and conditions are the same as in Example 1: the catalyst is adjusted to a Ni / Mo base catalyst, the hydropyrolysis liquefaction reactor is adjusted to an ebullating bed reactor, and the temperature of the ebullating bed reactor is adjusted to 430 ℃ and the pressure is adjusted to 4MPa, the average residence time is adjusted to 60min, the mass ratio of coal powder: solvent oil: catalyst: additive is adjusted to 100:70:0.5:3, the pressure of the medium pressure flash tank is adjusted to 2MPa, the oil The outlet temperature of the coal slurry preheater is adjusted to 380°C, the operating temperature and pressure of the hot high-pressure gas-liquid separator are adjusted to 400°C and 4MPa respectively, and the operating temperature and pressure of the cold high-pressure gas-liquid separator are adjusted to 10°C and 4MPa respectively , The bottom temperatures of the atmospheric distillation tower and the vacuum di...

Embodiment 3

[0122] Except for the following adjustments, other reaction processes and conditions are the same as in Example 1: the hydropyrolysis liquefaction reactor is adjusted to an expanded bed reactor, the temperature of the expanded bed reactor is adjusted to 390°C and the reaction pressure is adjusted to 3MPa, The average residence time is adjusted to 30min, the mass ratio of pulverized coal: solvent oil: catalyst: additive is adjusted to 100:110:3:0.1, the pressure of the medium pressure flash tank is adjusted to 1MPa, and the outlet temperature of the oil-coal slurry preheater Adjusted to 330°C, the operating temperature and pressure of the hot high-pressure gas-liquid separator were adjusted to 350°C and 3MPa, respectively, and the operating temperature and pressure of the cold high-pressure gas-liquid separator were adjusted to 30°C and 3MPa.

[0123] According to the same method as in Example 1, the coal conversion rate and liquid hydrocarbon yield in Example 3 were calculated,...

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Abstract

The invention relates to a method for preparing liquid hydrocarbon through coal temperature and hydropyrolysis. The method comprises the following steps: coal, solvent oil, a catalyst and an auxiliary are subjected to mixed pulping, preheating, hydropyrolysis and liquefaction, and an obtained product is separated; a separated-out gaseous product is enriched and purified, obtained hydrogen-rich gas serving as circulating hydrogen returns to a preparation system, and obtained hydrocarbon-rich gas is used as fuel; a separated-out liquid product can be directly used as a product or be used for producing liquid hydrocarbon with different applications through further hydrofining; a separated-out solid product such as semicoke can be used for producing hydrogen through gasification or used as a product directly. Compared with the conventional method for producing a liquid product directly from coal, the method can realize high oil yield under mild reaction conditions and has the advantages of simple process, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of coal processing and production of liquid hydrocarbons. In particular, the present invention relates to a method for preparing liquid hydrocarbons by gentle hydropyrolysis of coal. Background technique [0002] As we all know, coal reserves are huge in primary energy, while oil reserves are relatively small. However, due to the ease of transportation and processing of oil, all countries in the world are eager to obtain a large amount of oil resources to meet the needs of industry, life, and national defense. With the economic development of our country, the demand for petroleum products (such as gasoline, diesel oil, etc.) has also increased day by day in recent years. However, due to our country's resource endowment rich in coal and poor in oil, the oil self-sufficiency rate has declined year by year, and the degree of external dependence has continued to increase. Therefore, the stable supply of petrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/08
CPCC10G1/002C10G1/065C10G1/083C10G1/086
Inventor 杨勇郭强李永旺
Owner SYNFUELS CHINA TECH CO LTD