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Benzoic acid hydrogenation continuous reaction device and method thereof

A technology of reaction device and benzoic acid, which is applied in the direction of feeding device, chemical instrument and method, chemical/physical/physicochemical fixed reactor, etc., can solve the problem that the storage of Pd/C catalyst and Ru/C auxiliary agent cannot be maintained , catalyst activity limitation, impact on production and other issues, to achieve the effect of realizing gas-liquid mass transfer capacity and material mixing capacity, reducing the probability of poisoning and deactivation, and reducing the generation of by-products

Active Publication Date: 2020-04-07
WUHAN YOUJI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that due to the limited capacity of the centrifugal separator, there are still a small amount of suspended Pd / C catalyst and Ru / C additives in the separated clear liquid, which are then discharged into the next process, thereby blocking the pipeline. It not only affects the normal production, but also has certain potential safety hazards; at the same time, it cannot maintain the reserves of Pd / C catalyst and Ru / C additive in the system, so that the activity of the catalyst is limited, and it is still necessary to regularly replenish fresh catalyst and a certain proportion of Ru / C additive

Method used

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  • Benzoic acid hydrogenation continuous reaction device and method thereof
  • Benzoic acid hydrogenation continuous reaction device and method thereof

Examples

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Embodiment 1

[0033] refer to figure 1 , a continuous reaction device for hydrogenation of benzoic acid, comprising a raw material tank 12, a reaction tank 1, a buffer tank 4, a carbon rod filter 5, and a liquid storage tank 6 connected in series in sequence, and the upper part of the reaction tank 1 is provided with a liquid inlet 8 and exhaust gas discharge port 10, the bottom of the reaction tank 1 is provided with a hydrogenation port 9 and a first discharge port, and the hydrogenation port 9 is connected to the aerator 2 through a pipeline; the first discharge port of the reaction tank 1 The mouth is directly communicated with the feed inlet of the buffer tank 4, the buffer tank 4 is provided with a spoiler assembly 401, and the overflow port of the buffer tank 4 is located below the liquid level of the reaction tank 1 when it is working; The center of the bottom of the reaction tank 1 is provided with a first stirring device connected to the first stirring motor 301; the top of the ra...

Embodiment 2

[0046] refer to figure 1 , the structure principle of this embodiment is similar to that of Embodiment 1, and the difference from Embodiment 1 is that it also includes a second stirring device arranged at the center of the top of the liquid storage tank 6 and connected to the second stirring motor 601, so The second stirring device includes a second stirring shaft 602 and a second stirring blade 603, and the second stirring blade 603 is connected to the second stirring shaft 602 through a connecting piece.

[0047] By arranging the second mechanical stirring device in the liquid storage tank 6, the circulating reaction liquid filtered through the carbon rod filter 5 can be mixed more evenly, avoiding pipeline blockage, and improving the catalyst and its auxiliary agent in the continuous reaction process of benzoic acid hydrogenation. The cyclic performance of the agent.

Embodiment 3

[0049] Continue to refer to figure 1 , the structure principle of this embodiment is similar to that of embodiment 1 or embodiment 2, the difference is that: the bottom of the reaction tank 1 is provided with a second discharge port 101, and the second discharge port 101 is connected to the The liquid storage tank 6 is connected; the top of the liquid storage tank 6 is provided with an exhaust port and communicates with the waste gas discharge port 10 through a pipeline, and the side wall of the liquid storage tank 6 is provided with a liquid discharge port, and the liquid discharge port passes through The hydraulic pump 11 communicates with the buffer tank 4 .

[0050] Further, the pipeline of the liquid inlet 8 of the reaction tank 1, the pipeline of the hydrogenation port 9, the pipeline of the first outlet, the pipeline of the second outlet 101, the overflow pipe of the buffer tank 4 Road, the liquid outlet pipeline of the liquid storage tank 6, the liquid discharge pipel...

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Abstract

The invention discloses a benzoic acid hydrogenation continuous reaction device and a method thereof. The method includes: under the action of a Pd / C catalyst and a Ru / C assistant, carrying out contact reaction on molten benzoic acid and hydrogen to generate cyclohexanecarboxylic acid, and after the reaction, depositing the mixed solution in a buffer tank to separate most of the Pd / C catalyst andthe Ru / C assistant from the mixed solution, and directly circulating the Pd / C catalyst and the Ru / C assistant back into the reaction tank for reuse; after the buffer tank is full, letting the mixed solution overflow from the top into a carbon rod filter for further separation, and circulating the separated turbid liquid containing the high-concentration Pd / C catalyst and Ru / C assistant back to a raw material tank system; and making the clear liquid of a carbon rod filter shell layer directly enter a next production procedure. The device does not discharge the catalyst and also has no need forfrequent adding of a fresh catalyst, so that the cost of the catalyst in the continuous preparation process can be saved, the processing cost of the benzoic acid hydrogenation reaction is lowered, thecatalytic hydrogenation activity of the Pd / C catalyst is improved, and the production capacity of the device is increased.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a benzoic acid hydrogenation continuous reaction device and a method thereof. Background technique [0002] Cyclohexylcarboxylic acid and its derivatives are important chemical and pharmaceutical intermediates, which can be used to synthesize photocuring agents, anti-pregnancy drugs and drugs for treating schistosomiasis, and can also be used as vulcanized rubber solubilizers, petroleum clarifiers, pesticides, dyes and other organic compounds. compounds with high application value. [0003] At present, cyclohexyl formic acid is mostly prepared by metal-selective liquid-phase catalytic hydrogenation of benzoic acid. The reaction process uses benzoic acid and hydrogen as raw materials and Pd / C as a catalyst. The main product is cyclohexyl formic acid (CCA for short). The products are CO and CO generated by the decarboxylation of the reactant benzoic acid and the reactio...

Claims

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Application Information

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IPC IPC(8): B01J19/18B01J19/00B01J4/00C07C51/36B01J23/46C07C61/08
CPCB01J19/18B01J19/0006B01J4/005B01J4/001B01J4/008C07C51/36B01J23/462C07C2601/14C07C61/08
Inventor 舒振操孙波代飞朱明伟程娟黄正望毛利民
Owner WUHAN YOUJI IND
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