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Processing method of lignite

A processing method and technology for lignite, which are applied in chemical instruments and methods, preparation of organic compounds, preparation of liquid hydrocarbon mixtures, etc., can solve the problems of harsh operating conditions, high equipment requirements, and high cost, and achieve a high degree of localization. The effect of high liquefied oil yield and low cost

Active Publication Date: 2010-07-28
ZHAOQING SHUNXIN COAL CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Japan's BCL process has disadvantages such as harsh operating conditions, high requirements for equipment, high cost, and high cost.

Method used

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  • Processing method of lignite
  • Processing method of lignite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 As shown, the lignite and methanol are mixed and soaked according to the mass ratio of 1:3, and the swelling pretreatment is carried out at normal temperature and pressure. After 4 hours of swelling pretreatment, the pH of the swollen mixture was adjusted to 8.0 with NaOH solution, and supercritical methanol extraction was carried out under the supercritical conditions of extraction temperature 260°C and pressure 9.0MPa, and the extraction time was 60 minutes to obtain the extract and raffinate The conversion of lignite to crude phenol, methyl organic acid and humic acid in this section can reach 21.31% (daf).

[0021] The raffinate is prepared into coal slurry, which is subjected to hot-melt catalytic liquefaction treatment (see ZL200710032428.4 for the specific process of hot-melt catalytic liquefaction, which discloses a hot-melt catalytic method for producing liquid fuel from lignite), and the yield of liquefied oil is 31.13% (daf), the total produ...

Embodiment 2

[0026] The lignite and methanol are mixed and soaked according to the mass ratio of 1:2, and the swelling pretreatment is carried out at normal temperature and pressure. After 4 hours of swelling pretreatment, adjust the pH of the swollen mixture to 8.0 with NaOH solution, and perform supercritical methanol extraction under the supercritical conditions of extraction temperature 260 ° C and pressure 9.0 MPa, and the extraction time is 60 minutes to obtain the extract and raffinate The conversion rate of lignite to crude phenol, organic acid methyl ester and humic acid reaches 16.24% (daf).

[0027] The raffinate is prepared into coal slurry, which is subjected to thermal solution catalytic liquefaction treatment, and the yield of liquefied oil is 32.06% (daf), and the total product yield reaches 43.09%. Compared with the single-stage hot-melt catalytic liquefaction in this embodiment, the total product yield has increased by about 12%; hydrogen consumption has been saved by abo...

Embodiment 3

[0032] The lignite and methanol are mixed and soaked according to the mass ratio of 1:5, and the swelling pretreatment is carried out at normal temperature and pressure. After 4 hours of swelling pretreatment, adjust the pH of the swollen mixture to 8.0 with NaOH solution, and perform supercritical methanol extraction under the supercritical conditions of extraction temperature 260 ° C and pressure 9.0 MPa, and the extraction time is 60 minutes to obtain the extract and raffinate The conversion rate of lignite to crude phenol, organic acid methyl ester and humic acid is 23.06% (daf).

[0033] The raffinate is prepared into coal slurry, which is subjected to thermal solution catalytic liquefaction treatment, and the yield of liquefied oil is 30.69% (daf), and the total product yield reaches 46.67%. Compared with the single-stage hot-melt catalytic liquefaction in this embodiment, the total product yield has increased by about 15%; hydrogen consumption has been saved by about 23...

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Abstract

The invention discloses a processing method of lignite, comprising the following steps: A, taking methyl alcohol as extractant to carry out supercritical extraction processing to the lignite to obtain extraction liquid and raffinate; B, carrying out hot melt catalysis liquefaction processing to the raffinate to obtain liquid fuel. The invention has the beneficial effect: 1, the invention has moderate reaction condition, simple operation technology, high liquid oil yield, high domestication degree, low input and low cost and is safe and stable, and higher conversion rate of lignite; 2, the invention can obtain humic acid, organic acid methyl ester and phenol substances (phenyl hydroxide, cresol, dimethyl phenol and the like) and increase the additional value of products; 3, the supercritical methyl alcohol adopted by the invention removes R-OH and R-COOH class micromolecule substances in the lignite, which can reduce hydrogen consumption amount in the process of hot melt catalysis liquefaction so as to reduce hydrogen consumption; meanwhile, CO2 discharge amount in the process of hot melt catalysis liquefaction can be greatly reduced so as to achieve the purpose of greenhouse gas emission reduction; and 4, the invention performs swelling pretreatment to the lignite, changes lignite micropore structure, amplifies response ratio superficial area and improves the conversion rate of the lignite.

Description

technical field [0001] The invention belongs to the technical field of coal chemical processing, and in particular relates to a method for processing lignite by combining supercritical extraction and thermal solution catalytic liquefaction. Background technique [0002] Lignite is a low-rank coal between peat and bituminous coal. It is rich in reserves in my country. The proven reserves of lignite are 131.142 billion tons, accounting for 13% of coal reserves. However, compared with other coal types, lignite has high water content and is easy to weather in the air; it contains a certain amount of primary humic acid and has low carbon content; it has high volatile content, generally 45% to 55% (daf); lignite The thermal efficiency of direct combustion is low, and the industrial application value is low. Therefore, the research on how to rationally develop and efficiently utilize lignite resources is of great significance when oil production is far from meeting social needs. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/06C10G1/04C10L1/02C07G99/00C07C67/08C07C69/003C07C37/82C07C39/04C07C39/07
CPCY02P20/52Y02P20/54Y02P30/00
Inventor 吴克陈翀段占庭吴春来沙颖逊张治林顾菁
Owner ZHAOQING SHUNXIN COAL CHEM TECH
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