Method for preparing benzene carboxylic acids by alkali-oxygen oxidation of brown coals
A technology of benzene carboxylic acid and lignite, which is applied in the direction of chemical instruments and methods, preparation of organic compounds, carboxylate preparation, etc., can solve the problems of high production cost, difficulty in recycling, hindering the process of industrialization, etc., to avoid the consumption of acid, The effect of reducing process energy consumption and saving heat input
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Embodiment 1
[0034] This example illustrates a process in which lignite is used as raw material, the mass ratio of alkali and coal in the reaction material is 0.3:1, the reaction temperature is 300° C., and the reaction time is 1 min.
[0035] Take 1 g of Huolinhe lignite (particle size ≤ 0.074 mm), 0.3 g of sodium hydroxide, and 20 mL of deionized water in a 50 mL high-temperature and high-pressure reactor, fill with oxygen to replace the air in the reactor, and finally fill with Oxygen was injected with an initial pressure of 5.0 MPa. Put the reaction kettle into the heating furnace, turn on the stirring, and control the stirring speed to 200 r / min. When the temperature rises to 300 °C, the stopwatch starts to count. After 1 min, the stirring is stopped, and the reaction kettle is immediately taken out and placed in a cold water bath to terminate the reaction. After the reaction kettle is cooled, take out the reacted mixture, filter off the residue, and collect the water-insoluble acid p...
Embodiment 2
[0039]This example illustrates the process of using lignite as raw material, the mass ratio of alkali and coal in the reaction material is 0.8:1, the reaction temperature is 300°C, and the reaction time is 1 min. And compared with the traditional method, it shows the advantages of this method.
[0040] Take 1 g of Huolinhe lignite (particle size ≤ 0.074 mm), 0.8 g of sodium hydroxide, and 20 mL of deionized water in a 50 mL high-temperature and high-pressure reactor, fill with oxygen to replace the air in the reactor, and finally fill with Oxygen was injected with an initial pressure of 5.0 MPa. Put the reaction kettle into the heating furnace, turn on the stirring, and control the stirring speed to 200 r / min. When the temperature rises to 300 °C, the stopwatch starts timing, stop stirring after 1 min, and immediately take out the reaction kettle and put it in a cold water bath to terminate the reaction. After the reactor is cooled, take out the reacted mixture, filter off th...
Embodiment 3
[0045] In this example, lignite is used as raw material, the mass ratio of alkali and coal in the reaction material is 1.2:1, the reaction temperature is 300°C, and the reaction time is 1 min.
[0046] Take 1 g of Huolinhe lignite (particle size ≤ 0.074 mm), 1.2 g of sodium hydroxide, and 20 mL of deionized water in a 50 mL high-temperature and high-pressure reactor, fill with oxygen to replace the air in the reactor, and finally fill with Oxygen was injected with an initial pressure of 5.0 MPa. Put the reaction kettle into the heating furnace, turn on the stirring and control the stirring speed at 200 r / min, when the temperature rises to 300 °C, the stopwatch starts timing, stop stirring after 1 min, take out the reaction kettle immediately and put it in a cold water bath to terminate the reaction. After the reactor is cooled, take out the reacted mixture, filter off the residue, and acidify to obtain a water-insoluble acid precipitate and a water-soluble acid solution.
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