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System for extracting lignite wax from pulverized coal and method thereof

A technology for montan wax and pulverized coal, which is used in the recovery/refining of mineral wax, solid solvent extraction, petroleum industry, etc., can solve the problems of low pressure, large particle size, low extraction temperature, etc., and achieves high temperature and pressure, small particle size, The effect of low solvent loss rate

Pending Publication Date: 2021-10-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The traditional lignite extractor cannot use pulverized coal (1mm), resulting in more than 50% of the wax-rich coal being unusable
[0009] (2) The higher the temperature of the extraction process, the greater the pressure, and the smaller the particle size, the higher the extraction rate. However, the traditional extraction process uses solid particle feed and high-temperature extractant feed, resulting in the extraction process being carried out under slight negative pressure. This also causes problems such as low extraction temperature, low pressure, and large particle size, resulting in low extraction rate, which generally does not exceed 75%.
[0010] In summary, the current process cannot realize the safe and efficient extraction process of lignite from pulverized coal

Method used

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  • System for extracting lignite wax from pulverized coal and method thereof
  • System for extracting lignite wax from pulverized coal and method thereof
  • System for extracting lignite wax from pulverized coal and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Preparation of a particle of less than 1 mm (4.8% pure wax content) was prepared from 50 kg, and 75 l extractant ethyl acetate was added to the mass / volume of 1: 1.5 (kg: L), and the coal paste was prepared. The slurry pump pumps the coal slurry into the tube extractor, and superheated steam is passed in the jacket. Among them, the inner diameter of the tubular extractor is 30 mm, the outer diameter is 50 mm, the single tube is about 50m, and the total length is 1200m. The extracted temperature was 110 ° C, the pressure was 0.5 MPa, and the slurry was passed in a tube extractor at a temperature of 2 m / s. After 10 minutes, the separator (sequentially passed through the positive pressure filter, tape filler, microporous filter), sequentially filtered, and the filter cake washing (washing conditions: filter cake and extractant The mass / volume of ethyl acetate is 1: 1 (kg: L), the washing temperature is 80 ° C, the time is 60 ° C) and filtered (sequentially passing the po...

Embodiment 2

[0096] The same method as in Example 1 is different in that the sieval of the brown coal (4.8% pure wax content) is prepared as less than 1 mm of particles, and the mass / volume is 1: 2 (kg: L). The 2000L extractant is prepared into a coal slurry, and the coal slurry pump is pumped into the tube extractor, and the saturated vapor is accessed 120 ° C in the jacket. After extracting for 30 minutes in the extractor, the liquid solid separation is entered into the separator, sequentially passed through filtration, filter cake washing, and filtration, resulting in an extract, after removieting drying, obtaining a brown coal wax 74.4 kg (pure wax content 54%) ), Recovering solvent 1960L.

Embodiment 3

[0098] The size of the tubular extractor is: the inner diameter is 50 mm, the outer diameter is 60 mm, the single tube length is 50m, and the total length is 1200m.

[0099] After the same method as in Example 1, the brown coal wax was finally obtained (54% pure wax content), and the solvent 73L was recovered.

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Abstract

The invention provides a system for extracting lignite wax from pulverized coal and a method thereof . The system for extracting lignite wax from pulverized coal comprises a pulping unit, an extraction unit, a filtering unit and a desolventizing unit which are connected in sequence, wherein the extraction unit comprises a tubular extractor. The method for extracting lignite wax from pulverized coal provided by the invention comprises the following steps: mixing a pulverized coal raw material with an extracting agent to obtain slurry; extracting the slurry through a tubular extractor, and obtaining the extracted slurry; filtering the extracted slurry to obtain a filter cake and filtrate a; and distilling the filtrate a to obtain the lignite wax. The method provided by the invention can realize extraction of lignite wax from pulverized coal, and is high in extraction rate and low in solvent loss rate.

Description

Technical field [0001] The present invention relates to a system and method for pulverizing coal extraction of brown coal wax. Background technique [0002] The brown coal wax is an indispensable important chemical product. The brown coal wax is also known as the Mundhamia, which is a mineral wax containing wax, resin and asphalt. The extraction of the brown coal wax is a natural mineral wax that is extracted from the extracted coal with a wax coal or peat with a solvent (benzene, gasoline, etc.). 1%, so the wax coal resources are extremely precious. However, chewing brown coal usually has a high water content and mechanical strength difference, resulting in a large amount of pulverizing coal during mining, crushing, and drying, and has more than half of the powder. The usual particle size of the usual brown coal wax extracting device is from which the coal is less than 1 mm cannot be utilized, resulting in a great waste of resources. [0003] The conventional extraction process ...

Claims

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Application Information

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IPC IPC(8): C10G73/00B01D11/02
CPCC10G73/00B01D11/02
Inventor 崔鑫张中华常彬杰张翠清郭屹
Owner CHNA ENERGY INVESTMENT CORP LTD
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