Aromatic methanol alkylation method for removing oxygen-containing compound impurities

A compound and alkylation technology, applied in the direction of chemical change purification/separation, condensation between hydrocarbons and non-hydrocarbons, organic chemistry, etc., to achieve the effects of eliminating adverse effects, low equipment investment and operating costs, and increasing production

Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, methanol raw material undergoes various reactions after contacting with the catalyst under high temperature conditions, which will also bring a series of problems

Method used

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  • Aromatic methanol alkylation method for removing oxygen-containing compound impurities

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Experimental program
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Effect test

Embodiment 1

[0023] The preparation method of the methylation catalyst: 40%~90% of at least one of ZSM-5 zeolite or MCM-22 zeolite molecular sieve and 15~80% of γ-Al 2 o 3 After the binder is fully mixed, add an appropriate amount of water to knead and shape, dry and 550 o After C is calcined, the catalyst body is obtained. 0.01~5.0% of MgO, La 2 o 3 , CaO and SiO 2 At least one of them is loaded on the catalyst body to obtain the methylation catalyst.

[0024] Preparation method of oxygenate removal catalyst: 10%~95% La 2 o 3 , ZnO, ZrO 2 , CaO, MgO, TiO 2 and Cr 2 o 3 At least one of the oxides and 5~90% γ-Al 2 o 3, silicon oxide or clay binder is fully mixed, add appropriate amount of water and knead it into shape, dry and 450 o After C is calcined, the oxygen-containing compound removal catalyst is obtained.

[0025] The reactor is loaded with a toluene methylation catalyst and an oxygenate removal catalyst respectively from top to bottom, and the mass ratio of the upper ...

Embodiment 2

[0030] The reactor is filled with a benzylation catalyst and an oxygenate removal catalyst respectively from top to bottom, and the mass ratio of the upper and lower beds is 1:4. Toluene: methanol (molar ratio) = 3:1, benzene weight space velocity for 2 hours -1 , the reaction temperature is 400°C, and the reaction pressure is 1MPa; after the liquid phase product is separated by the oil-water separator, the oil phase enters the stripper for light component separation, the stripper top temperature is 124°C, and the stripper top pressure is 0.51MPa. As shown in the flow chart, the analysis results of oxygenates such as acetaldehyde, methanol, acetone, butanone and acetic acid in streams I, II and III are shown in Table 2 below.

[0031] Table 2

[0032] Stream I (wtppm) Stream II (wtppm) Stream III (wtppm) Acetaldehyde 15 13 ≤0.5 Methanol 806 65 ≤0.5 acetone ≤0.5 ≤0.5 ≤0.5 butanone ≤0.5 ≤0.5 ≤0.5 Acetic acid ≤0.5 ≤0.5 ≤0....

Embodiment 3

[0035] The reactor is filled with a toluene selective methylation catalyst and an oxygenate removal catalyst respectively from top to bottom, and the mass ratio of the upper and lower beds is 1:1. Toluene: methanol (molar ratio) = 2:1, toluene weight space velocity 4 hours -1 , reaction temperature 450 o C, the reaction pressure is 0.6MPa; after the liquid phase product is separated by the oil-water separator, the oil phase enters the stripping tower for light component separation, the temperature at the top of the stripping tower is 120°C, and the pressure at the top of the stripping tower is 0.50MPa. As shown in the flow chart, the analysis results of oxygenates such as acetaldehyde, methanol, acetone, butanone and acetic acid in streams I, II, III and IV are shown in Table 3 below.

[0036] table 3

[0037] Stream I (wtppm) Stream II (wtppm) Stream III (wtppm) Acetaldehyde 9 7 ≤0.5 Methanol 106 18 ≤0.5 acetone ≤0.5 ≤0.5 ≤0.5 b...

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Abstract

The invention relates to an arene methanol alkylation method for removing oxygen-containing compound impurities, which is mainly used for solving the problem that oxygen-containing compound impurities exist in an arene product in the prior art. The method provided by the invention solves the problem relatively well by adopting the following technical scheme: a) the mixed raw material of benzene or toluene and methanol contacts with a composite catalyst in a composite bed reactor to generate a material flow I; b) the material flow I is subjected to heat exchange and cooling before entering an oil-water separator, the lower-layer byproduct water is discharged outside, and the upper-layer oil phase overflows to the downstream part as a material flow II; c) the material flow II enters a stripping tower, the light component is discharged outside through the tower top, the heavy component is combined into an arene combination device as a material flow III, and the p-xylene is separated out. The method can be applied to the industrial production of producing mixed xylene or p-xylene through the alkylation reaction of arene such as benzene or toluene and methanol.

Description

technical field [0001] The present invention relates to a kind of aromatic hydrocarbon methanol alkylation method that removes oxygen-containing compound impurity, especially about a kind of by-product alcohols, aldehydes, ketones and carboxylate in the methylation reaction product of benzene or toluene and methanol A method for the removal of acid impurities. Background technique [0002] P-xylene is a very important basic organic raw material in petrochemical industry, and it is widely used in the fields of polyester fiber, medicine, pesticide, dyestuff and solvent. At present, the global PX production capacity has exceeded 30 million tons per year, and the production capacity is still growing rapidly. It is expected that the production capacity will exceed 40 million tons by 2011, and the production capacity and consumption demand of Asia rank first in the world. In 2011 Asia's demand for PX is expected to reach nearly 24 million tons in 2020. As the world's most import...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/08C07C2/88C07C7/148
CPCY02P20/52
Inventor 孔德金郑均林李旭光邹薇
Owner CHINA PETROLEUM & CHEM CORP
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