Method for preparing refined anthracene by using coal tar as raw material
A technology of coal tar and refined anthracene, applied in the field of preparation of refined anthracene, can solve problems such as safety production and environmental protection difficulties, environmental pollution, flammability, etc., to avoid excessive loss of refined anthracene, improve economic value, and use less solvent Effect
Examples
Embodiment 1
[0019] Step 1, the coal tar after the dehydration treatment is distilled at atmospheric pressure, and the fraction between 300 and 360 °C is cut;
[0020] Step 2, cooling all the fractions obtained in the step to room temperature, standing for crystallization at 10°C for 5 hours, to obtain an anthracene-carba mixture;
[0021] Step 3: Take 100 g of the anthracene-carbaphate mixture obtained in Step 2, add 200 g of xylene solution and 100 g of potassium hydroxide, and put them into a reactor connected with a water separator, stir and heat, heat and reflux to separate water until almost no moisture out. Stop heating and stirring, cool to room temperature, and filter. The obtained 350g filtrate is a crude anthracene solution, and the filter cake is carbazole potassium; the carbazole potassium salt is hydrolyzed, and the product is repeatedly washed with water until pH = 7, and the filter cake is dried to obtain 30g Refined carbazole;
[0022] Step 4. Distill the crude anthracen...
Embodiment 2
[0025] Step 1, the coal tar after the dehydration treatment is distilled at atmospheric pressure, and the fraction between 300 and 360 ° C is cut;
[0026] Step 2, cooling all the fractions obtained in the step to room temperature, standing at 0°C for 1 hour to crystallize, and obtaining the anthracene-carba mixture;
[0027] Step 3: Take 100 g of the anthracene-carbamate mixture obtained in step 2, add 900 g of ethanol and 100 g of potassium carbonate, and put them together in a reactor connected to a water separator, stir and heat, and heat to reflux to separate water until almost no water comes out. Stop heating and stirring, cool to room temperature, and filter. The obtained 550g filtrate is a crude anthracene solution, and the filter cake is carbazole potassium; the carbazole potassium salt is hydrolyzed, and the product is repeatedly washed with water until pH = 7, and the filter cake is dried to obtain 33g Refined carbazole;
[0028] Step 4. Distill the crude anthracen...
Embodiment 3
[0031] Step 1, the coal tar after the dehydration treatment is distilled at atmospheric pressure, and the fraction between 300 and 360 ° C is cut;
[0032] Step 2, cooling all the fractions obtained in the step to room temperature, standing for crystallization at 5°C for 3 hours, and obtaining an anthracene-carba mixture;
[0033] Step 3: Take 100 g of the anthracene-carbamate mixture obtained in Step 2, add 500 g of ether and 100 g of potassium bicarbonate, and put them together into a reactor connected to a water separator, stir and heat, heat and reflux to separate water until almost no water comes out . Stop heating and stirring, cool to room temperature, and filter. The obtained 420g filtrate is crude anthracene solution, and the filter cake is carbazole potassium; the carbazole potassium salt is hydrolyzed, and the product is washed repeatedly with water until pH=7, and the filter cake is dried to obtain 28g Refined carbazole;
[0034] Step 4. Distill the crude anthrac...
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Description
Claims
Application Information
- IPC
- C07C15/28; C07C7/04; C07C7/14; C07C7/00
- Inventors
- 韩钊武