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

CN114130335AActive Publication Date: 2022-03-04ZHEJIANG SHENGXIAO CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-03-04

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Abstract

The invention discloses a method for preparing p-hydroxybenzoic acid, raw materials for preparing p-hydroxybenzoic acid are reacted in a reaction kettle, the reaction kettle comprises a kettle body and a kettle cover, the kettle cover is provided with a stirring device extending into the kettle body, the kettle body is provided with a feed port and a discharge port, and the discharge port is provided with a discharge port. The outer side of the kettle body is provided with a first pressure maintaining cavity and a second pressure maintaining cavity which are respectively communicated with the feed port and the discharge port, pressure monitoring devices are arranged in the first pressure maintaining cavity and the second pressure maintaining cavity, the first pressure maintaining cavity is communicated with a pressurizing jet device, the second pressure maintaining cavity is communicated with a buffer cavity, and a heating device and a cooling device are also arranged in the kettle body; the feeding port and the discharging port are each provided with a first valve, a second valve is arranged between the pressurizing jet flow device and the first pressure maintaining cavity, and the buffering cavity and the second pressure maintaining cavity are provided with a third valve in a communicating mode. The invention provides a preparation method of p-hydroxybenzoic acid, which can perform continuous reaction, and solves the problem of poor continuity of carboxylation reaction of p-hydroxybenzoic acid in the prior art.
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Description

technical field

[0001] The application relates to the technical field of p-hydroxybenzoic acid production, in particular to a preparation method of p-hydroxybenzoic acid. Background technique

[0002] p-Hydroxybenzoic acid, or PHBA, is an important raw material for organic synthesis. Because of its unique hydroxyl and carboxyl functional groups, it has become one of the most widely used materials in organic chemical raw materials. It is used in medicine, pesticides, food, electronic communications, and polymer materials. Widely used in industry and other fields. In recent years, there has been a huge demand for PHBA in domestic and foreign markets. The existing PHBA production process is relatively backward, with complex operation, low yield, high energy consumption and large waste water production. In addition, with the continuous development of society, the demand for high-purity, low-chroma, and high-stability PHBA is increasing day by day in related downstream industri...

Examples

Embodiment

[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...