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Low-rank coal alcoholysis deoxidization method

A low-rank coal, anhydrous ethanol technology, applied in the petroleum industry, solid fuel, fuel and other directions, can solve the problems of reaching 20.71%, harsh process conditions, low total coal oxygen removal rate, etc., to reduce production costs, improve quality effect

Active Publication Date: 2015-05-13
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
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Problems solved by technology

[0008] The process conditions are harsh, and the total oxygen removal rate of coal is low. Under low-temperature pyrolysis conditions, the total oxygen removal rate of Yanzhou coal is 2.98% at a temperature of 350°C and a constant temperature of 20 minutes, and that of Datong coal at a temperature of 390°C and a constant temperature of 20 minutes The total oxygen removal rate is 9.50%, while in the hydrothermal treatment test, the maximum oxygen removal rate of Huolinhe coal can only reach 20.71% at the temperature of 300 °C and the constant temperature time of 1 h.

Method used

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  • Low-rank coal alcoholysis deoxidization method

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specific Embodiment approach

[0019] Low-order coal alcohol solution deoxygenation method of the present invention, its preferred embodiment is:

[0020] Include steps:

[0021] A. Weigh 1 part by weight of dry-based low-rank coal and 3 to 10 parts by weight of absolute ethanol, mix them uniformly and pour them into an autoclave;

[0022] B. Fill the sealed autoclave with N with a purity greater than 99% 2 The oxygen in the kettle is exhausted, the stirring speed in the high-pressure reactor is 300-400rad / min, the heating rate is controlled at 5-10°C / min to the reaction temperature of 220°C-300°C, and then the temperature is kept constant for 30min-120min;

[0023] C. Cool the high-pressure reactor to room temperature, take out the reaction product and vacuum filter to obtain filtrate and filter residue respectively, and obtain deoxidized coal after vacuum drying the obtained filter residue.

[0024] In described step B, use the N that purity is greater than 99% earlier 2 After purging for 3 to 5 times,...

Embodiment 1

[0033] Example 1, the process conditions are temperature (220°C or 300°C), constant temperature time (30min or 120min), and coal dissolving ratio (3:1 or 10:1).

[0034] In the first step, weigh 1 part by weight of low-rank coal (dry basis) and 3 or 10 parts by weight of absolute ethanol, mix them uniformly, and pour them into an autoclave;

[0035] The second step is to seal the autoclave and fill it with nitrogen with a purity greater than 99% to remove the oxygen in the autoclave. The stirring speed in the autoclave is (300-400) rad / min, and the heating rate is controlled to be (5-10) ℃ / Min to the reaction temperature (220°C or 300°C) and then keep the temperature for 30min or 120min;

[0036] In the third step, the high-pressure reactor is cooled to room temperature, and the reaction product is taken out for vacuum filtration to obtain filtrate and coal sample respectively, and the obtained filter residue is vacuum-dried to obtain deoxidized coal.

Embodiment 2

[0037] Example 2, the process conditions are temperature (220-300°C), constant temperature time (30-120min), and coal-dissolving ratio (3:1-10:1).

[0038] In the first step, weigh 1 part by weight of low-rank coal (dry basis) and 3-10 parts by weight of absolute ethanol, mix them uniformly and pour them into a high-pressure reactor;

[0039] In the second step, the autoclave is sealed and filled with nitrogen with a purity greater than 99% ( figure 11) Exclude the oxygen in the kettle, the stirring speed in the high-pressure reactor is (300-400) rad / min, control the heating rate to be (5-10) °C / min to the reaction temperature (220-300 °C), and then keep the temperature for 30 minutes— 120min;

[0040] In the third step, the high-pressure reactor is cooled to room temperature, and the reaction product is taken out for vacuum filtration to obtain filtrate and coal sample respectively, and the obtained filter residue is vacuum-dried to obtain deoxidized coal.

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Abstract

The invention discloses a low-rank coal alcoholysis deoxidization method, which comprises the following steps of weighing 1 part by weight of dry basis low-rank coal and 3 to 10 parts by weight of absolute ethyl alcohol, uniformly mixing the low-rank coal and the absolute ethyl alcohol, and pouring the mixture into a high-pressure reactor; charging N2 with purity of more than 99 percent into the sealed high-pressure reactor to remove oxygen from the reactor, wherein the stirring speed in the high-pressure reactor is 300 to 400rad / min, the heating speed is controlled to be 5 to 10 DEG C per minute, and the temperature is maintained for 30 to 120 minutes after the reaction temperature reaches 220 to 300 DEG C; cooling the high-pressure reactor to room temperature, taking out a reaction product, performing vacuum suction filtration to obtain filtrate and residues respectively, and performing vacuum drying on the residues to obtain deoxidized coal. According to the method, high deoxidization rate can be achieved under the conditions of low temperature and pressure, the production cost is lowered, and the quality of lignite is improved.

Description

technical field [0001] The invention relates to a method for deoxidizing low-rank coal, in particular to a method for deoxygenating low-rank coal by alcoholysis. Background technique [0002] Low-rank coal has high oxygen content, high water content, and low calorific value, so it is not suitable for long-distance transportation and direct utilization, and its application range is limited. Direct liquefaction of low-rank coal is a way to effectively utilize low-rank coal, but high oxygen content will cause a large hydrogen consumption in the process of direct liquefaction, so pretreatment is required before direct liquefaction to remove low-rank coal Part of the oxygen and moisture in the rank coal can reduce the hydrogen consumption in the liquefaction project and reduce the production cost. Oxygen in coal mainly exists in two states of organic oxygen and inorganic oxygen. Functional groups exist in the form of carboxyl, hydroxyl, methoxy, carbonyl, and ether linkages. O...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/00
Inventor 张书陈艳巨张海永王永刚周剑林白磊徐敏
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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