Low and medium temperature coal tar cold cutting separation method

A separation method, coal tar technology, applied in tar processing, tar processing by chemical method, tar processing by selective solvent extraction, etc., can solve the problem of low yield of light tar, secondary cracking of coal tar, energy consumption Large and other problems, to achieve the effect of no secondary pollution, cost reduction, and simple process

Inactive Publication Date: 2012-01-04
孙成忠 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal cutting temperature is relatively high, generally above 300°C, which consumes too much energy. If the heating temperature is too high, it will cause secondary cracking of coal tar, which will generate gas (dry gas) and cause pollution. Moreover, the molecular weight of coal tar produced today is large, High viscosity and high density, the yield of light tar (light fraction) is extremely low during thermal splitting, only 25-30%, and the density is 0.97-1.0 g / cm 3
[0003] It can be seen from the above description that the existing technology for separating light tar from coal tar has great shortcomings, and has a great disadvantage in the purification and application of light tar, which is not conducive to the full utilization of coal tar and hinders industrialization. Large-scale production, so it is of great significance to find a method that can fully separate light tar from coal tar

Method used

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  • Low and medium temperature coal tar cold cutting separation method
  • Low and medium temperature coal tar cold cutting separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The bituminous coal in Fugu, Shenmu, Shaanxi is selected as the coal for production, crushed, and then added to the retorting furnace to produce coal tar. The coal first enters the preheating zone and then enters the cracking zone, and as the temperature rises, coal tar is continuously produced, which is stored in the furnace. The tar is gaseous. When the coal is put into the furnace, a complexing agent is injected into the preheating zone of the furnace at 350-400 °C. The amount of the complexing agent added is 10% of the mass of the gaseous coal tar. The gaseous coal tar produced is in the furnace. It reacts with a complexing agent and modifies it to prevent the deep polymerization of coal tar molecules. After the reaction, the gaseous tar is added to cooling water for cooling to become liquid coal tar, and then the moisture in the coal tar is removed to less than 3% to obtain the finished coal tar.

[0029] Weigh the extractants A, B and C according to the mass ratio o...

Embodiment 2

[0031] The bituminous coal was selected as the production coal to prepare coal tar, and the method was the same as that in Example 1, except that the amount of the complexing agent used was 10% of the mass of the gaseous coal tar. Add the obtained coal tar product to the fractionation tower, add A, B, C mixed extractant with a mass ratio of 1:3:5 according to the addition amount of 8wt%, mix and stir evenly, and then stand at about 40-50 ° C for 1 -2h for stratification, and finally the mixed solution is divided into three layers, the upper layer is light tar (yield 60-80wt%, density 0.95g / cm 3 left and right), the middle part is the mixed extractant (yield 95-99wt%), the lower part is heavy tar, and the required components are obtained by separating each layer separately. The obtained light tar and heavy tar (tar pitch) can be directly sold or further modified by hydrogenation to obtain the desired components.

Embodiment 3

[0033] The peat in the Fugu area of ​​Shenmu, Shaanxi was selected as the production coal to prepare coal tar, and the method was the same as that in Example 1, except that the amount of the complexing agent used was 6% of the gaseous coal tar quality. Add the obtained coal tar product to the fractionation tower, add A, B, C mixed extractant with a mass ratio of 1:3:1.7 according to the addition amount of 6wt%, mix and stir evenly, and then stand at about 40-50 ° C for 1 -2h for stratification, and finally the mixed solution is divided into three layers, the upper layer is light tar (yield 60-80wt%, density 0.95g / cm 3 left and right), the middle part is heavy tar, the lower part is mixed extractant (yield 95-99wt%), light tar does not contain extractant, and the required components are obtained by separating each layer. The obtained light tar and heavy tar (tar pitch) can be directly sold or further modified by hydrogenation to obtain the desired components.

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Abstract

The invention discloses a low and medium temperature coal tar cold cutting separation method. The method comprises steps that: during a low and medium temperature coal tar production procedure, a complexing agent is added into a dry distillation preheating zone with a temperature of 350 to 400 DEG C through spraying, such that coal tar gas is modified; post processing is carried out on the modified coal tar gas, such that liquid state coal tar is obtained; an extracting agent is added to the liquid state coal tar, the mixture is well mixed by stirring and is stood under a temperature of 40 to50 DEG C; after standing, the mixed liquid of the coal tar and the extracting agent is divided into three layers; the components of the different layers are respectively separated, such that light tar, heavy tar and the extracting agent are obtained. The technology of the invention is simple; the added complexing agent and the extracting agent are cheap and easy to obtain; the light tar and the heavy fraction are completely separated; and the light tar is characterized by low specific weight, low density, and high yield. Also, a cold cutting technology is used in tar separation, such that theenergy consumption is low, no secondary pollution is brought in, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for separating light tar and heavy fractions of low and medium temperature coal tar, in particular to a low temperature cold cutting separation method of low and medium temperature coal tar with high yield of light tar. Background technique [0002] Coal tar is obtained by heating and dry distillation of coal isolated from air. Coal tar obtained at high temperature is called high temperature coal tar, coal tar obtained at low temperature is called low temperature coal tar, and coal tar obtained between the two temperatures is called medium temperature coal tar. Generally, the coal tar yield obtained by dry distillation is higher at low and medium temperature. The preparation temperature of low and medium temperature coal tar is below 700°C, and the desired product can be obtained by further hydroprocessing, but its composition is extremely complex, and separation and purification are difficult. In the existing process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/00C10C1/18C10C1/20C10B57/12
Inventor 孙成忠李燕波
Owner 孙成忠
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