Preparation method of p-hydroxybenzoic acid
A technology of p-hydroxybenzoic acid and pressure-holding chambers, which is applied in the preparation of carboxylate salts, chemical instruments and methods, and the preparation of organic compounds. It can solve problems such as poor continuity, improve reaction quality and product yield, and improve agitation. High quality and stable effect
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[0023] Such as Figure 1 to Figure 3 As shown, a reaction kettle structure with high stirring efficiency for solid-phase carboxylation includes a kettle body 1 and a kettle cover 2, and the kettle body 1 and the kettle cover 2 are connected in a detachable and sealed manner. The kettle cover 2 is provided with a stirring device extending into the kettle body 1, the kettle body 1 is provided with a feed port and a discharge port, and the outside of the kettle body 1 is provided with a first protective device respectively connected to the feed port and the discharge port. The pressure chamber 3 and the second pressure chamber 4, the first pressure chamber 3 and the second pressure chamber 4 are provided with a pressure monitoring device 5, the first pressure chamber 3 is communicated with a pressurized jet device 12, the second The pressure-holding chamber 4 is connected with a buffer chamber 6, and the kettle body 1 is also provided with a heating device 7, a cooling device 8 a...
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