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A kind of method for preparing camphor by continuous dehydrogenation of isoborneol

A technology for isoborneol and dehydrogenation, which is applied in the field of continuous dehydrogenation of isoborneol to prepare camphor, can solve the problems of unreasonable utilization of product hydrogen, unreasonable reactor design, short catalyst life, etc., and it is difficult to achieve local overheating phenomenon. , Improve the one-way conversion rate, the effect of not easy to deactivate

Active Publication Date: 2019-01-18
FUZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to provide a method for preparing camphor by continuous dehydrogenation of isoborneol, which overcomes the short catalyst life and non-renewable catalyst in the prior art, low conversion rate caused by unreasonable reactor design, high energy consumption, and no product hydrogen. Reasonable utilization and other issues, this method can achieve good catalytic effect of the catalyst and can be regenerated, the reactors are designed in series to avoid the formation of temperature gradients, realize the rational utilization of energy and the recovery and use of hydrogen, improve conversion rate and selectivity, and save energy , lower cost, higher output, etc.

Method used

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  • A kind of method for preparing camphor by continuous dehydrogenation of isoborneol
  • A kind of method for preparing camphor by continuous dehydrogenation of isoborneol
  • A kind of method for preparing camphor by continuous dehydrogenation of isoborneol

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Embodiment 1

[0053] In this implementation case, at first the isoborneol solution is a solution with a mass fraction of 30% formed after the isoborneol is dissolved in p-xylene, and is first exchanged through the discharge of the heat exchanger E-101 and the reactor R-103 Heat, after reaching the preheating temperature of 220°C, enter the series reactor from the lower part of the reactor R-101 for dehydrogenation reaction: the reactor is a tubular fixed bed reactor, and the catalyst is packed in the tube side in the form of molding, The heat transfer medium heat transfer oil is installed on the shell side; the dehydrogenation catalyst is a Cu-Zn two-component dehydrogenation catalyst DH021 developed by the Nanjing Chemical Industry Co., Ltd. Research Institute; the air for the isoborneol dehydrogenation reaction Speed ​​WHSV is 0.8h -1 , the number of reactors connected in series is 3, the reaction bed temperature is 220°C, 240°C, 260°C, the reaction pressure is 0.8 MPa, 0.9 MPa, 1.2 MPa, ...

Embodiment 2

[0056] The difference from Example 1 is that the space velocity WHSV of the isoborneol dehydrogenation reaction described in this example is 0.5h -1 .

Embodiment 3

[0058] The difference from Example 1 is that the solvent of isoborneol in this example is p-cymene.

[0059] Implementation 4

[0060] The difference from Example 1 is that the bed temperatures of the series reactors described in this example are 200° C., 220° C., and 240° C., and the reaction pressures are 0.5 MPa, 0.7 MPa, and 1 MPa sequentially.

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Abstract

The invention relates to a method for preparing camphor through continuous dehydrogenation of isoborneol.In the camphor synthetizing industry at present, the step of preparing camphor through dehydrogenation of isoborneol is critical.The method for preparing camphor through isoborneol overcomes the defects that the conversion rate is low, products are difficultly purified, a catalyst is likely to be inactivated, and hydrogen cannot be recycled due to batch operation.By adopting continuous operation, the camphor yield is high, and obtained hydrogen can be recycled; due to tubular reactors connected in series, the reaction temperature and pressure are controllable, materials are subjected to a reaction on the liquid phase condition, the conversion rate of the reversible reaction is increased, the product purification difficulty is lowered, the catalysis efficiency of the selected catalyst is high on the condition, the service life is long, the product is reproducible, and defects existing in original technologies are overcome to a large extent.

Description

technical field [0001] The invention relates to a method for preparing camphor by continuous dehydrogenation of isoborneol, which is applied to the production of camphor. Background technique [0002] Camphor has a strong cool feeling and aromatic smell, has anti-corrosion, insect repellent and insect-proof functions, and has good plasticizing properties for special materials such as nitrocellulose. Therefore, camphor is used in pharmaceutical intermediates, insect-resistant agents, spices, and incense. , industrial raw materials and other fields have a wide range of applications. [0003] Due to reasons such as lack of resources and nature protection, naturally obtained camphor has been far from meeting the growing market demand. Therefore, the industry of synthesizing camphor from turpentine has been greatly developed. In the process of producing camphor, there is a step reaction of isoborneol dehydrogenation. The original process uses basic copper carbonate as a catalys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/00C07C49/437
CPCC07C45/002C07C49/437
Inventor 郑辉东李超陈金亮吴丹邓新贵苏江波
Owner FUZHOU UNIV
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