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Method for preparing methylbenzene and m-cymene from 3-carene and device thereof

A technology of m-cymene and p-cymene, which is applied in chemical instruments and methods, isomerization of hydrocarbons, hydrocarbons, etc., can solve difficult and difficult separation problems, and achieve low material loss and environmental friendliness , the effect of high product purity

Active Publication Date: 2014-01-22
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the products generated by the above methods are all mixtures of three isomers, and they are isomers of each other, which are difficult to separate by general methods. It is very difficult to obtain a single substance with high purity

Method used

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  • Method for preparing methylbenzene and m-cymene from 3-carene and device thereof
  • Method for preparing methylbenzene and m-cymene from 3-carene and device thereof
  • Method for preparing methylbenzene and m-cymene from 3-carene and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Type A catalyst Pt-Al 2 o 3 (The amount of platinum loaded is the carrier Al 2 o 3 1% of the mass, the same below, Fujian Xiamen Yongquan Group) and B-type catalyst ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 =50) (Tianjin Nanhua Catalyst Co., Ltd.) were crushed to 20-30 mesh particles, loaded with 6.3cm 3 (8cm) and 12.5cm 3 (16cm) in a quartz reaction tube with a length of 30cm and an inner diameter of 1cm; the inlet and outlet of the reaction tube are respectively connected to the reaction bottle and the condenser tube equipped with a ventilation tube, a constant pressure dropping funnel, and a temperature controller, and the flow rate of the carrier gas is adjusted. 15mL / min, heat the reaction tube to 300°C; slowly and uniformly drop 3-carene with a content of 92.6% into the reaction flask preheated to about 190°C through a constant pressure dropping funnel, 3-carene After gasification, it enters the reaction tube with the carrier gas, distills out after the reacti...

Embodiment 2

[0036] Pt-Al 2 o 3 With ZSM-5 type molecular sieve (SiO 2 / Al 2 o 3 =50) with a loading volume of 12.5cm respectively 3 (16cm) and 6.3cm 3 (8cm), the rest of the process parameters are the same as in Example 1, and the contents of toluene, xylene, methylethylbenzene and m-cymene in the distillate are 29.2%, 0.9%, 1.2% and 53.6% respectively.

Embodiment 3

[0038] Pt-Al 2 o 3 With ZSM-5 type molecular sieve (SiO 2 / Al 2 o 3 =50) the loading volume is 9.5cm 3 (12cm), all the other process parameters are the same as in Example 1, and the contents of toluene, xylene, methylethylbenzene and m-cymene in the distillate are respectively 33.1%, 1.4%, 2.2% and 51.3%.

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Abstract

The invention discloses a method for preparing methylbenzene and m-cymene from 3-carene and a device of the method. 3-carene is subjected to isomerism to be a mixture of p-cymene and m-cymene under catalysis of an A-type catalyst, wherein the A-type catalyst is one or a mixture compounded from more of supported catalysts of platinum, palladium and nickel; the mixture of p-cymene and m-cymene conducts splitting reaction on p-cymene in the mixture on presence of a B-type catalyst so as to obtain a mixture with methylbenzene and m-cymene; the mixture is rectified, separated and purified to obtain methylbenzene and m-cymene; the B-type catalyst is one or a mixture compounded from more of ZSM-5 sodium type molecular sieve and ZSM-5 hydrogen type molecular sieve of various silica-alumina ratios. The method is green, simple and efficient, raw materials are natural and reproducible, and a product has property equivalent to natural products.

Description

technical field [0001] The invention relates to the field of deep processing and utilization of turpentine oil, in particular to a process technology for synchronously preparing toluene and m-cymene from 3-carene, a component of turpentine oil, a corresponding catalyst and a process device, and toluene and m-cymene are natural equivalent products. Background technique [0002] The chemical name of 3-carene is 3,7,7-trimethylbicyclo[4.1.0]hept-3-ene and its molecular formula is C 10 h 16 , with a relative molecular mass of 136.24. 3-carene is an important monoterpene component in natural essential oils. It has a special pine aroma and can be used directly as a spice. At the same time, 3-carene has good chemical reactivity and can occur such as Oxidation, reduction, addition, isomerization, formylation, hydroboration and other reactions, a series of compounds prepared from them are widely used in spices, pesticides, medicine and other fields. [0003] Turpentine is the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/06C07C15/02C07C5/31C07C4/18
Inventor 赵振东王婧李冬梅毕良武陈玉湘古研卢言菊
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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