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Method for producing p-cymene by continuous production and apparatus thereof

A technology for cymene and gasifier, applied in chemical instruments and methods, chemical recovery, organic chemistry, etc., can solve the problems of incapable of continuous industrialized production, small reaction scale, complicated processing process, etc., and achieve high equipment utilization rate , The effect of complete response and simple operation

Inactive Publication Date: 2009-06-24
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the shortcomings of the prior art that the reaction scale is small, industrialized continuous production cannot be produced, and the processing process is complicated, the present invention provides a method and device for continuous production of p-cymene, which have the advantages of continuous production, simple operation, and no waste material, no solvent and other reagents are needed, and the catalyst is simple and recyclable

Method used

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  • Method for producing p-cymene by continuous production and apparatus thereof
  • Method for producing p-cymene by continuous production and apparatus thereof
  • Method for producing p-cymene by continuous production and apparatus thereof

Examples

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Effect test

Embodiment 1

[0020] A method for continuous production of p-cymene from industrial dipentene, which uses industrial dipentene as a raw material, uses Pd / C as a catalyst, and undergoes a catalytic dehydrogenation reaction in a continuous reaction device to continuously produce p-cymene hydrocarbon method. like figure 1 As shown, it specifically includes the following steps:

[0021] Step 1: Add 0.1kg to 50.0kg of catalyst into the reactor, feed inert carrier gas nitrogen at a rate of 0.01L / min to 5.00L / min, turn on the heating device, and when the temperature of the reactor reaches 150°C to 400°C, Turn on the metering pump, and press the equivalent air speed of 0.5h -1 ~5.0h -1 The speed is continuously fed into the industrial dipentene raw material, preheated, gasified, and contacted with the catalyst for reaction. The above-mentioned catalyst is a Pd / C catalyst, and its palladium content is between 0.1% and 10.0%. Control the reactor temperature to be 150°C, 160°C, 170°C, 180°C, 190°...

Embodiment 2

[0024] The device for implementing the above-mentioned production method described in the present invention, such as figure 2 Shown: It is mainly composed of raw material storage tank 1, metering pump 2, preheater 3, vaporizer 4, reactor 5, condenser 6, product storage tank 7 and heating device, in the preheater 3 and raw material storage tank 1 is provided with a metering pump 2 capable of continuous constant flow feeding, and the inlet of the metering pump 2 is connected with the outlet of the raw material storage tank 1, the outlet of the metering pump 2 is connected with the inlet of the preheater 3, and then the outlet of the preheater 3 is connected with the gas The inlet of the vaporizer 4 is connected, the outlet of the vaporizer 4 is connected with the inlet of the top of the reactor 5, the outlet of the bottom of the reactor 5 is connected with the inlet of the condenser 6, the outlet of the condenser 6 is connected with the inlet of the product storage tank 7, the h...

Embodiment 3～5

[0027] Operation steps for the continuous production of p-cymene from industrial dipentene at a temperature of 260°C:

[0028] The operation steps are the same as in Example 1, except that the temperature of the reactor is controlled at 260°C, and the nitrogen flow rates are respectively set to 0.01L / min, 0.10L / min, 1.00L / min, 1.50L / min, 2.00L / min, 3.00 The feed rate of L / min, 4.00L / min or 5.00L / min and raw material is equivalent to the space velocity of 0.5h -1 ~5.0h -1 . When the reaction conditions are stable, samples are taken for chromatographic analysis, and the p-cymene content in the product is 87% to 89%. The ratio of product outlet quality to raw material inlet quality is between 0.97 and 1.00.

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Abstract

The invention discloses a method for continuously producing p-cymene and a device thereof. The method comprises the following steps: 0.1kg-50.0kg of catalyst is filled in a reactor, and the catalyst is Pd / C catalyst; inertia eluant gas is pumped into the catalyst and industrial dipentene raw material is continuously pumped in at the speed being equal to 0.5h<-1>-5.0h<-1> of the airspeed when the temperature of the reactor reaches 150-400 DEG C; the industrial dipentene raw material is preheated and gasified, and has contact reaction with the catalyst; the obtained reaction product continuously enters a condenser, and the p-cymene is obtained. The device consists of a raw material storage tank, a preheater, a gasifier, the reactor, the condenser and a product storage tank. A metering pump which can be used for continuous feeding with constant flow is arranged between the preheater and the raw material storage tank, and the inlet of the metering pump is communicated with the raw material storage tank; the metering pump is connected with the preheater and then is communicated with the top of the reactor through the gasifier, and the bottom of the reactor is connected with the product storage tank by the condenser. The invention has the advantages of simple operation, good controllability, no waste production, no solvent and other reaction reagents, recycled catalyst, purity and greening, etc.

Description

technical field [0001] The invention relates to a production method and device for preparing p-cymene, in particular to a method for continuously producing p-cymene from turpentine derivatives and a device thereof. Background technique [0002] P-cymene, namely p-cymene, is an important chemical product and a widely used intermediate in organic synthesis. P-cymene can be obtained by catalytic dehydrogenation of industrial dipentene. p-Cymene can be directly used in soft drinks, iced foods, candies, chewing gum, seasonings, used to prepare cosmetics, soap and detergent flavors; can be used to make soft capsules, used as antitussive and expectorant , to treat chronic bronchitis; at the same time, it can also be used to synthesize a variety of polycyclic musk fragrances, and other aromatic ring-containing fragrances, drugs, herbicides, fungicides, etc.; it can also be used to synthesize p-cresol and its downstream products, etc.; It can also be used as a thinner for formulati...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C5/367
CPCY02P20/584
Inventor 毕良武赵振东张秋格李冬梅古研王婧刘先章
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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