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Toluene selective disproportionation and carbon 9 and above arene dealkytation method

A selective and dealkylation technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as high energy consumption, large circulation volume of xylene separation unit and isomerization unit

Inactive Publication Date: 2005-01-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that in the production of p-xylene in the prior art, due to the low concentration of p-xylene in mixed xylene, there are problems such as large circulation volume and high energy consumption of xylene separation unit and isomerization unit, providing A New Method for Selective Disproportionation of Toluene and Dealkylation of C9 and Above Aromatics

Method used

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  • Toluene selective disproportionation and carbon 9 and above arene dealkytation method
  • Toluene selective disproportionation and carbon 9 and above arene dealkytation method
  • Toluene selective disproportionation and carbon 9 and above arene dealkytation method

Examples

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Embodiment 1

[0027] Separating the mixed raw materials containing benzene, toluene, C8 aromatics, C9 and above aromatics and non-aromatics to obtain C9 and above aromatics, which are used as raw materials, under the condition of hydrogen, in a fixed bed reactor Carry out the investigation of the dealkylation reaction performance of aromatic hydrocarbons with carbon nine and above. The inner diameter of the reactor is φ25 mm, the length is 1000 mm, and it is made of stainless steel. The upper and lower sides of the catalyst bed are filled with φ3 mm glass beads for air distribution and support, and the reactor is filled with 20 grams of β-zeolite catalyst containing 0.05% bismuth. Aromatic raw materials are mixed with hydrogen and then passed through the catalyst bed from top to bottom for C 9 + A dealkylation reaction to generate benzene, toluene and C 8 A, the reaction temperature is 425°C, the pressure is 3.0Mpa, and the weight space velocity is 2.0 hours -1 , the molar ratio of hydr...

Embodiment 2

[0038] C in typical reformed depentanized oil 6 A~C 10 + The composition of each substance of hydrocarbon is the basic data, investigate the present invention according to the appended figure 2 The process flow shown shows the pX and benzene production capacity and the processing scale of each unit.

[0039] Table 3 shows the composition distribution of aromatics sent out from a typical reformer and the flow rate of each component used in this example.

[0040] composition

[0041] According to attached figure 2 The aromatics flow rate (fresh feed) in the technological process of the present invention described and table 3 and embodiment 1 carbon nine and above aromatics dealkylation reaction result and toluene selective disproportionation reaction result, the reaction of toluene selective disproportionation unit The product also enters the adsorption separation device for separation. The feed and discharge data of the toluene selective disproportionation unit,...

Embodiment 3

[0048] Still using the process flow, process conditions and catalyst of Example 2, taking the raw material composition shown in Table 3 as a benchmark, the raw material throughput was increased by 29%, and the flow rate of the raw material was shown in Table 7. Based on this, re-examine the ability of the process of the present invention to produce pX and benzene. The processing scale of each unit of the aromatics complex is shown in Table 8, and the production of p-xylene and benzene is shown in Table 9.

[0049] composition

[0050]

[0051] product

[0052] Compared with embodiment 2, embodiment 3 has increased the device processing capacity of 29%, and the total output of p-xylene and benzene has increased by 31.2%, and the processing scale of each unit, except the selective disproportionation unit not established in the comparative example, The processing scales of other units have not increased, and the closest processing scale is the xylene ...

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Abstract

The invention relates to a toluene selective disproportionation and carbon 9 and above arene dealkytation method, wherein a hybrid dimethylbenzene and C9 above aromatic hydrocarbons reaction of high concentration paraxylene selective disproportionation is employed for producing benzene, toluene, and xylol combination in thermodynamic equilibrium state. The invention can be applied into industrial production of aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a method for selective disproportionation of toluene and dealkylation of aromatic hydrocarbons with carbon nine and above. Specifically, it is to pass through carbon nine and above aromatics (C 9 + A) dealkylation (hereinafter referred to as dealkylation of heavy aromatics) reacts to generate benzene (Ben), toluene (Tol) and carbon eight aromatics (C 8 A), and then by selective disproportionation of toluene and p-xylene adsorption separation or crystallization separation and C 8 A Isomerization technology, a method of producing para-xylene (pX). Background technique [0002] P-xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. The typical production method of p-xylene is from the thermodynamically balanced xylene containing ethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/12C07C6/12C07C7/12C07C7/14C07C15/08
Inventor 杨卫胜孔德金
Owner CHINA PETROLEUM & CHEM CORP
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