Device and method for synthesizing 3, 5-dimethylphenol by electromagnetic heat supply method

A dimethylphenol, electromagnetic heating technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of low yield and selectivity, difficult to clean coke, etc. The effect of fast vaporization and high safety factor

Pending Publication Date: 2022-07-22
ZHEJIANG JINKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method adopts the cracking equipment as a coil and the molten salt heating method, which has certain operational risks, low yield and selectivity, and is difficult to clean coke.

Method used

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  • Device and method for synthesizing 3, 5-dimethylphenol by electromagnetic heat supply method
  • Device and method for synthesizing 3, 5-dimethylphenol by electromagnetic heat supply method
  • Device and method for synthesizing 3, 5-dimethylphenol by electromagnetic heat supply method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 100kg of isophorone, load into the raw material tank, take by weighing 1,2-dibromoethane and methyl iodide ratio to be 5:1 catalyst 1kg is loaded into the catalyst tank, and is injected into the reaction device by plunger pump section, During the process, the outlet temperature of the vaporization tube is controlled to be 430°C-450°C, the outlet temperature of the preheating tube is 480°C-500°C, the temperature of the cracking tube outlet is 540°C-550°C, the feed rate of the raw material is 200g / min, and the feed rate of the catalyst is 4g / min; the cracked gas enters the caustic washing tower kettle after being condensed by the alkaline washing tower and the condenser, and the upper organic phase is the crude 3,5-dimethylphenol. The non-condensable gas methane is evacuated after passing through the tail gas water sealing device. The organic phase was analyzed by gas phase detection results, and it was found that the conversion rate of isophorone was 100%, the sel...

Embodiment 2- Embodiment 8

[0045] Example 2-Example 8 are generally similar to Example 1, the catalyst dosage and feed rate in Example 1 are adjusted, and the remaining steps are identical to Example 1. The details of Example 2-Example 8 are as follows:

[0046]

[0047] The conversion of the obtained isophorone and the selectivity and yield of 3,5-dimethylphenol are shown in the table above.

Embodiment 9- Embodiment 11

[0049] Change the catalyst compounding ratio in Example 1, and the remaining steps are equivalent to Example 1, respectively obtain Example 9-Example 11:

[0050]

[0051] The conversion of the obtained isophorone and the selectivity and yield of 3,5-dimethylphenol are shown in the table above.

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Abstract

The invention belongs to the field of fine chemical organic synthesis, and particularly relates to a device and method for synthesizing 3, 5-dimethylphenol through an electromagnetic heat supply method, specifically, a raw material isophorone is injected into a vaporization pipe through a raw material pump, the vaporization pipe is sequentially connected with a preheating pipe and a cracking pipe, and the vaporization pipe, the preheating pipe and the cracking pipe are heated through electromagnetic heaters; a catalyst is injected between an outlet of the vaporization pipe and an inlet of the preheating pipe through a catalyst feeding pump, and the catalyst and raw materials are mixed and heated in the preheating pipe and then enter the cracking pipe to be subjected to cracking reaction. Cracked gas in the cracking pipe sequentially passes through an alkaline washing tower kettle, an alkaline washing tower for alkaline washing, a condenser for condensation and water sealing, and cracked materials are collected into the alkaline washing tower kettle. According to the method, isophorone and the catalyst are fed in a segmented manner, and the aromatization reaction is performed in an electromagnetic heating manner, so that the uniform heat supply of the reactor can be ensured, and meanwhile, the selectivity and the conversion rate of the cracking reaction of isophorone are also improved.

Description

technical field [0001] The application belongs to the field of fine chemical organic synthesis, and in particular relates to a device and method for synthesizing 3,5-dimethylphenol by electromagnetic heating. Background technique [0002] 3,5-Dimethylphenol is an important industrial intermediate of chemical raw materials, mainly used for the preparation of basic raw materials such as antioxidants, antibiotics, resin adhesives, fungicides, disinfectants, vitamin E, vitamin A, etc. In the prior art, the isophorone aromatization method is the main method for preparing 3,5-dimethylphenol at present. [0003] British Patent Publication No.: GB1197803A, title: Method for preparing 3,5-dimethylphenol, which proposes to use activated alumina Al 2 O 3 As a catalyst, it reacts at a high temperature of 550-560 °C, but the conversion rate of isophorone is only 90%, the selectivity is not ideal, and the reaction process has high requirements on equipment, requiring high temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/00B01J8/08C07C37/50C07C39/07
CPCB01J8/001B01J8/0015B01J8/087C07C37/50C07C39/07
Inventor 张纪光吴相浩殷飞魏一帆徐聪
Owner ZHEJIANG JINKE CHEM
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