A kind of method that takes coal tar pitch as raw material to prepare benzene carboxylic acid
A technology for coal tar and benzene carboxylic acid, applied in the field of preparing benzene carboxylic acid, can solve the problems of high production cost, large investment, high purity of raw materials, and extremely high requirements on equipment materials, and achieves the effect of improving polarity and promoting contact
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Embodiment 1
[0021] This example illustrates that coal tar pitch taken from Datuhe Coking Plant in Shanxi Province is used as raw material (particle size <0.15mm). Take 10 g of coal tar pitch and perform Soxhlet extraction with 100 mL of methanol until the extract in the capillary is colorless. stop. The obtained raffinate was placed in a tube furnace, ventilated with air, and heated at 200 °C for 1 h to obtain a solid pyrolysis pretreated product. The solid pyrolysis pretreatment product is crushed through a 100-mesh sieve (particle size <0.15mm), and subjected to alkali-oxygen oxidation reaction. Take 2 g of sample, 10 g of sodium hydroxide, and 100 mL of deionized water in 300 mL of high-temperature and high-pressure reaction In the reactor, fill in oxygen to replace the air in the reactor, and finally fill in oxygen with an initial pressure of 5.0 MPa. Put the reaction kettle into the heating furnace, turn on the stirring, control the stirring speed to 400 r / min, wait for the temperat...
Embodiment 2
[0023] This example illustrates that coal tar pitch taken from Datuhe coking plant in Shanxi Province is used as raw material (particle size <0.15mm), and 10 g of coal tar pitch is used for 150 mL methanol and ethanol mixed solution (methanol: ethanol = 1:1). Soxhlet extraction was stopped when the extract in the capillary was colorless. The obtained raffinate was placed in a tube furnace, ventilated with air, and heated at 250 °C for 1 h to obtain a solid pyrolysis pretreated product. The solid pyrolysis pretreatment product is crushed through a 100-mesh sieve (particle size <0.15mm), and subjected to alkali-oxygen oxidation reaction. Take 2 g of sample, 8 g of sodium hydroxide, and 100 mL of deionized water in 300 mL of high-temperature and high-pressure reaction In the reactor, fill in oxygen to replace the air in the reactor, and finally fill in oxygen with an initial pressure of 6.0 MPa. Put the reaction kettle into the heating furnace, turn on the stirring, control the ...
Embodiment 3
[0025] This example illustrates that coal tar pitch obtained from Shanxi Jinyao Coking Co., Ltd. is used as raw material (particle size <0.15mm), 10 g of coal tar pitch is taken, and Soxhlet extraction is performed with 80 mL of ethanol. When the extract in the capillary is colorless stop. The obtained raffinate was placed in a tube furnace, ventilated with air, and heated at 300 °C for 0.5 h to obtain a solid pyrolysis pretreated product. The solid pyrolysis pretreatment product is crushed through a 100-mesh sieve (particle size <0.15mm), and subjected to alkali-oxygen oxidation reaction. Take 2 g of sample, 2 g of sodium hydroxide, and 100 mL of deionized water in 300 mL of high temperature and high pressure In the reactor, fill in oxygen to replace the air in the reactor, and finally fill in oxygen with an initial pressure of 4.0 MPa. Put the reaction kettle into the heating furnace, turn on the stirring, control the stirring speed to 400 r / min, wait for the temperature to...
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