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System and method for continuously producing high-quality and high-selectivity benzaldehyde and benzoic acid by using jet loop reactor

A loop reactor, high-selectivity technology, applied in chemical instruments and methods, separation methods, preparation of organic compounds, etc., can solve problems such as application methods to be studied, and achieve short reaction residence time, high raw material utilization, and gas. The effect of sufficient liquid contact

Active Publication Date: 2020-09-01
WUHAN YOUJI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Among all kinds of reactors, the jet loop reactor uses high-speed mobile phase to entrain other phases to obtain high mixing effect with relatively low energy consumption, and sprays the mixed phase into the reactor to form an overall good circulation in it to promote the reaction. Continuous, well suited for heterogeneous reactions with limited mass transfer, but its specific application in the production of benzoic acid and benzaldehyde remains to be studied

Method used

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  • System and method for continuously producing high-quality and high-selectivity benzaldehyde and benzoic acid by using jet loop reactor
  • System and method for continuously producing high-quality and high-selectivity benzaldehyde and benzoic acid by using jet loop reactor
  • System and method for continuously producing high-quality and high-selectivity benzaldehyde and benzoic acid by using jet loop reactor

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Embodiment 1

[0048] see figure 1 , the embodiment of the present invention provides a system for continuously producing high-quality high-selectivity benzaldehyde and benzoic acid using a jet loop reactor, including a jet loop reactor 1, a toluene removal tower 2, a dividing wall tower 3 and a benzaldehyde rectification tower 4.

[0049] The jet loop reactor 1 includes a feed inlet, a high-pressure reactor 101, a loop circulation pump 102, a shell-and-tube heat exchanger 103, a Venturi ejector 104, an emergency vent valve 105, and a reaction liquid outlet 111; The tube-and-tube heat exchanger 103 is connected with the steam drum 112 for heat exchange and temperature control, removing the reaction heat in time, and promoting the reaction; the emergency vent valve 105 is located at the top of the high-pressure reactor for To ensure the safety of the reaction in the high-pressure reactor 101 ; the feed ports include a nitrogen feed port 106 , an oxygen feed port 107 , a toluene feed port 108...

Embodiment 2

[0065] Embodiment 2 provides a kind of method utilizing jet loop reactor to continuously produce high-quality high-selectivity benzaldehyde and benzoic acid, compared with embodiment 1, difference is to change the catalyst type, relative flow rate and The parameters related to the oxidation reaction are the same as the rest of the steps, and will not be repeated here.

[0066] The catalyst used in embodiment 2 is the mixture that 150g cobalt isooctanoate and 150g manganese isooctanoate form, and the mixed solution that this catalyst forms with 1000L toluene injects in the jet loop reactor with the flow velocity of 70L / h, and its jet flow velocity is 70m / s The relevant parameters of the oxidation reaction in embodiment 2 are as shown in table 1.

[0067] Oxidation reaction related parameters in the step S1 of the embodiment 2 of table 1

[0068]

[0069] The product obtained in Example 2 is analyzed, and the toluene conversion rate, product selectivity and product purity in...

Embodiment 3

[0074] Embodiment 3 provides a kind of method utilizing jet loop reactor to continuously produce high-quality high-selectivity benzaldehyde and benzoic acid. Compared with embodiment 1, the difference is that the catalyst type and oxidation reaction in step S1 are changed. parameter. Wherein, the catalyst used in step S1 of Example 3 is cobalt isooctanoate, and the oxidation reaction is carried out under the action of pure oxygen. The oxidation reaction temperature is 165° C., and the oxidation reaction time is 1 h. The remaining parameters are consistent with those in Example 1. This will not be repeated here.

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Abstract

The invention discloses a system and a method for continuously producing high-quality and high-selectivity benzaldehyde and benzoic acid by using a jet loop reactor. The system comprises a jet loop reactor, a toluene removal tower, a dividing wall tower and a benzaldehyde rectifying tower. Based on the system, toluene oxidation reaction is performed in the jet loop reactor by taking toluene as a raw material, oxygen as an oxidizing agent and organic salt as a catalyst, and oxidation liquid after reaction is subjected to product purification through the toluene removal tower, the dividing walltower and the benzaldehyde rectifying tower, so that continuous production of high-quality and high-selectivity benzaldehyde and benzoic acid is realized. By means of the mode, the selectivity of benzaldehyde can be effectively improved, and high-quality benzoic acid and benzaldehyde with high purity can be produced. The production system is simple in structure and low in equipment investment, theproduction method is simple in operation, easy to control, short in reaction time and high in raw material utilization rate, and the whole reaction process is safe, stable, green and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of organic synthesis technology, in particular to a system and method for continuously producing high-quality, high-selectivity benzaldehyde and benzoic acid using a jet loop reactor. Background technique [0002] Both benzoic acid and benzaldehyde are important fine chemical products. Among them, benzoic acid is one of the important raw materials in the organic synthesis industry. It can be used as a food preservative, a rust inhibitor for steel equipment, a mordant for dyeing and printing, and a modifier for carboxylic acid resins. It can also be used as an additive for pharmaceuticals and dyes. Intermediates with a wide range of applications; as an important and simplest aromatic aldehyde, benzaldehyde not only has high industrial added value, but also has important value in fields such as agriculture, medicine, food, and dyes. [0003] At present, benzoic acid and benzaldehyde are mainly produced by liq...

Claims

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Application Information

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IPC IPC(8): C07C45/36C07C45/81C07C45/82C07C47/54C07C51/265C07C51/43C07C51/44C07C63/06B01D3/00
CPCC07C45/36C07C45/81C07C45/82C07C51/265C07C51/43C07C51/44B01D3/009C07C47/54C07C63/06Y02P20/584
Inventor 孙波舒振操程娟代飞聂少春黄正望毛利民
Owner WUHAN YOUJI IND
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