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Preparing method for 3,5-dimethyl phenol

A kind of xylenol, the said technology, applied in 3 fields, can solve the problems such as not easy to obtain, expensive, and higher catalytic condition requirements, and achieve the effect of reducing the dosage

Inactive Publication Date: 2005-02-23
MAOYANG CHEM IND SCI & TECH DEV SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the productive rate and the selectivity of reaction are all unsatisfactory; The second, homogeneous catalyst has better catalytic effect, can obtain larger productive rate and selectivity, but this type of catalyst is expensive, and is difficult to obtain, to The requirements for catalytic conditions are also higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In an inert atmosphere, the mixture of isophorone and liquid catalyst was passed into the reactor with solid catalyst from the top, and the reaction product was exported from the bottom of the reactor, then cooled to 0°C, and 3,5-xylenol was collected. Implementation conditions:

[0029] The solid catalyst is Cr 2 o 3 -γ-Al 2 o 3 , solid catalyst dosage: 40ml, Cr in solid catalyst 2 o 3 The mass content is 18%. The liquid catalyst is bromoalkane, the consumption is 1% of the mass of the reactant, the inert gas is nitrogen, the feed rate is 45ml / h, the water intake is 20ml / h, the reaction temperature is 540°C, and the reaction pressure is 0.2Mpa.

[0030] Test results: the conversion rate is 100%, the selectivity is 88.2%, and the yield is 88.0%.

Embodiment 2

[0032] Adopt the method identical with embodiment, its technological condition is:

[0033] The solid catalyst is NaHCO 3 -γ-Al 2 o 3 , solid catalyst dosage: 40ml, NaHCO in solid catalyst 3 The mass content is 10%. Liquid catalyst is methyl iodide, consumption is 1.5% of reactant quality, inert gas is nitrogen, feed rate 35ml / h, water inflow 15ml / h, reaction temperature is 560 ℃, and reaction pressure is normal pressure.

[0034] Test results: the conversion rate is 98%, the selectivity is 92.8%, and the yield is 90%.

Embodiment 3

[0036] Adopt the method identical with embodiment, its technological condition is:

[0037] The solid catalyst is Co-Mo-Na-γ-Al 2 o 3 , the amount of solid catalyst: 40ml, the mass content of Co—Mo—Na in the solid catalyst is 15%. The liquid catalyst is bromoalkane, the consumption is 2% of the reactant mass, the inert gas is nitrogen, the feed rate is 40ml / h, the reaction temperature is 600°C, and the reaction pressure is 0.2Mpa.

[0038] Test results: the conversion rate is 98%, the selectivity is 91%, and the yield is 89%.

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PUM

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Abstract

A process for preparing 3.5-xylenol features that the isophorone, liquid catalyst, and solid catalyst take part in reaction in inertial gas, and conventional collecting 3,5-xylenol.

Description

technical field [0001] The invention relates to a preparation method of 3,5-xylenol. Background technique [0002] 3,5-Xylenol is an important industrial intermediate. It is a white powdery solid with a boiling point of 219.5°C. It is soluble in alkali solution and miscible with ethanol. It is an important raw material used in the production of oxidant-pressed paper adhesives, and can also be used as a raw material for the production of antibacterial powder, antiseptic liquid, shampoo, etc. It is an important intermediate for pesticides, medicines, and phenolic resins. Therefore, the production of 3,5-xylenol and the optimization of its production process are an important part of improving industrial production efficiency. [0003] The traditional 3,5-xylenol is mainly derived from coal tar. But its quantity is extremely limited, can't meet the needs of industrial production at all. Moreover, it is quite difficult to separate the pure 3,5-xylenol from coal tar in a very c...

Claims

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Application Information

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IPC IPC(8): C07C37/50C07C39/07
Inventor 刘纯山
Owner MAOYANG CHEM IND SCI & TECH DEV SHANGHAI
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