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Method and device for leaching high-quality lignite wax

A montan wax, high-quality technology, applied in the field of coal chemical industry, can solve the problems of affecting the health of operators, high consumption of stripping steam, poor solvent selectivity, etc., to reduce processing costs, reduce wax production rate, and improve quality. Effect

Active Publication Date: 2014-06-25
QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Main problems: the mixed solvents of benzene, toluene, aromatic hydrocarbons and aliphatic hydrocarbons used in the prior art are highly toxic, which not only affects the health of operators, but also pollutes the environment; High steam extraction consumption; poor solvent selectivity, high content of impurities (resin and asphalt) in wax; during production, more process wastewater is generated

Method used

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  • Method and device for leaching high-quality lignite wax
  • Method and device for leaching high-quality lignite wax

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preparation example Construction

[0030] The preparation device of the present invention also includes a solvent condensing device 4, the extractor 1 and the upper part of the wax liquid evaporation tank 2 are respectively provided with steam outlets 15, 22, and the steam outlets 15 and 22 pass through the solvent condensing device 4 and the solvent Storage tank 3 is connected.

[0031] The discharge port 14 communicates with the residual coal bunker 5, and the residual coal bunker 5 is provided with a heating device and / or a vacuum extraction device and a steam outlet 51, and the steam outlet 51 communicates with the solvent storage tank 3 through the solvent condensation device 4 .

[0032] Working principle and working process of the present invention:

[0033] Such as figure 2 As shown, the lignite is crushed, screened and dried to obtain qualified coal (1-8mm, moisture 15-25%), which is fed into the extractor 1 from the lignite feeding port 11 . The linear alkane solvent is pumped into the extractor...

Embodiment 1

[0038] Such as figure 1 As shown, the lignite produced in Zhaotong, Yunnan Province was taken, and after crushing, it was screened and intercepted through sieves with apertures of 2.0 mm and 5.0 mm to obtain lignite particles with a particle size of 2.0 to 5.0 mm, which were dried to a moisture content of 25%; 500 kg of dried lignite particles were placed in Add 1000L of No. 4 solvent oil into the leaching tank, keep the indoor temperature at 25°C and keep the pressure at 1MPa in the tank, soak the lignite for 3 hours, separate and filter to obtain the leaching solution and residual coal; put the separated leaching solution into the separation device, and heat the leaching solution to 40 The low boiling point No. 4 solvent oil is evaporated at ℃, and the montan wax is separated from the solvent; the montan wax is cooled and formed to obtain 24.8kg of the montan wax product, wherein the resin content accounts for 14.57%, and the asphalt content accounts for 2.29%; the residual w...

Embodiment 2

[0040]Take lignite produced in Yuezhou, Qujing, Yunnan, crush it, and sieve it through sieves with apertures of 1.0mm and 3.0mm to obtain lignite particles with a particle size of 1.0-3.0mm, and dry them to a moisture content of 15%; take 500kg of dried lignite particles and place them in a leaching tank 2000L of liquefied natural gas was added, and hot water was introduced into the tank wall to maintain a temperature of 35°C in the tank and a pressure of 0.5 MPa. After soaking the lignite for 4 hours, the leachate and residual coal were separated and filtered; the separated leachate was placed in a separation device, The decompression in the separation device is reduced to 50KPa (vacuum degree), so that the low boiling point liquefied natural gas in the leaching liquid is evaporated, and the montan wax is separated from the solvent; The content accounts for 1.29%; the residual coal after waxy leaching is placed in a desolventizer, and the residual coal is heated to 30°C to eva...

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Abstract

The invention discloses a method and a device for leaching high-quality lignite wax. The leaching method comprises the followings steps: smashing lignite, sieving by use of a sieve with the hole size of 1.0-8.0 millimeters, and drying until the water content is 15-25 percent; loading the dried lignite and a straight-chain paraffin solvent into a leaching device at a temperature of 0.5-1.5MPa at a material-liquid ratio of (1:2)-(1:5) (kg / L), soaking at the temperature of 10-40 DEG C for 3-6 hours, and performing material-liquid separation to obtain leach liquor and residual lignite; putting the leach liquor into a separating device, and heating to 30-60 DEG C or reducing the pressure to 30-60KPa for evaporating the solvent to obtain lignite wax and a solvent; putting the leached residual lignite into a desolventizer, and heating or evaporating the residual solvent under reduced pressure under the conditions of the step C to obtain lignite residues and the solvent. The leaching device comprises a leacher, a fluid wax evaporation-separation tank and a solvent storage tank. According to the method, low-toxicity straight-chain paraffin is taken as a leaching solvent, and a leaching process is performed at the room temperature or a temperature higher than the room temperature, so that energy conservation and environmental protection are facilitated, and the resin content and asphalt content of the wax are low.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for leaching high-quality montan wax with energy saving, environmental protection and low content of resin and bitumen. Background technique [0002] Montan wax generally refers to a mineral wax containing pure wax, resin and bitumen extracted from waxy coal (mainly lignite or some peat) with an organic solvent, also known as montan wax. Montan wax has a relatively hard texture, high melting point, acid resistance, good chemical stability, gloss and electrical insulation, is easily soluble in organic solvents, can be mixed with petroleum wax, stearic acid, etc., and has no carcinogenic effect. Therefore, it is widely used as a substitute and supplement for expensive natural animal wax and vegetable wax, and is an indispensable and important chemical product in the national economy. [0003] At present, montan wax production at home and abroad ...

Claims

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Application Information

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IPC IPC(8): C10G73/00B01D11/02
Inventor 刘长胜罗国林
Owner QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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