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Method for preparing aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in fixed bed reactor

A fixed bed reactor, methanol conversion technology, applied in the field of coal chemical industry, can solve the problems of long process, repeated equipment construction, low efficiency and so on

Active Publication Date: 2015-04-08
SHANXI FEISHI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a process has problems such as lengthy process, repeated equipment construction, and low efficiency.

Method used

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  • Method for preparing aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in fixed bed reactor
  • Method for preparing aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in fixed bed reactor
  • Method for preparing aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in fixed bed reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Refer to the accompanying drawings for the process flow diagram of methanol conversion in a fixed bed reactor to produce a BTX-rich aromatic hydrocarbon mixture in Example 1.

[0063] The inner diameter of the fixed bed reactor is 6.0m. The top is equipped with a reaction material inlet, the bottom is equipped with a reaction material outlet, and the side wall is equipped with 6 reaction material inlets. The catalyst is filled with 7 catalyst combination units. In the catalyst combination unit, methanol conversion to light olefin catalyst and light olefin aromatization catalyst Both are commercial catalysts, and the mass ratio of the two is 1.0. Among the materials entering the reactor from the top of the reactor, the mass ratio of water vapor and methanol is 5.0, and the mass ratio of circulating LPG and methanol is 1.2. Methanol mass space velocity is 0.8h -1 . The reaction pressure is 0.2 MPa.

[0064] Embodiment 1 The specific operation steps of the method for p...

Embodiment 2

[0082] All the conditions of Example 2 are the same as those of Example 1, but in the catalyst combination unit, the catalyst for converting methanol to low-carbon olefins and the catalyst for aromatizing low-carbon olefins are both commercial catalysts, and the mass ratio of the two is 2.0. Change the mass flow rate of water vapor at the top inlet of the reactor so that the mass ratio of water vapor to methanol vapor in the material entering the reactor from the top is 3.0. The mass flow rate of methanol vapor at each side wall inlet was changed accordingly to maintain the mass ratio of water to methanol entering each catalyst combination unit at 3.0. Methanol mass space velocity is 0.8h -1 , the temperature of each bed inlet material is controlled to be 400°C, and the reactor pressure is controlled to be 0.18MPa. Example 2 The loading parameters and material flow parameters of the catalyst combination unit in the fixed bed reactor are shown in Table 3.

[0083] Table 3. Th...

Embodiment 3

[0089] The inner diameter of the fixed bed reactor is 5.0m. The top is equipped with a reaction material inlet, the bottom is equipped with a reaction material outlet, and the side wall is equipped with 4 reaction material inlets. The catalyst is filled with 5 catalyst combination units. In the catalyst combination unit, methanol conversion to light olefin catalyst and light olefin aromatization catalyst Both are commercial catalysts, and the mass ratio of the two is 2.0. In the material entering the reactor from the top of the reactor, the mass ratio of water vapor and methanol is 5.0, and the mass ratio of circulating LPG and methanol is 1.5. Methanol mass space velocity is 1.0h -1 . The temperature of the inlet material of each bed is controlled to be 420°C, and the pressure of the reactor is controlled to be 0.25MPa. Example 3 The loading parameters and material flow parameters of the catalyst combination unit in the fixed bed reactor are shown in Table 5.

[0090] Tab...

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Abstract

The invention relates to a method for preparing an aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in a fixed bed reactor. The method comprises the following steps of feeding a catalyst for preparation of low-carbon olefin by conversion of methanol and a catalyst for aromatization of low-carbon olefin in the same fixed bed reactor to form a catalyst combined unit in which the lower layer is the catalyst for aromatization of low-carbon olefin and the upper layer is catalyst for preparation of low-carbon olefin by conversion of methanol; dividing methanol steam into a plurality of blasts, mixing one blast of the methanol steam, circulating LPG and water steam to obtain a mixture, feeding the mixture into the fixed bed reactor from a material inlet formed in the top of the fixed bed reactor, feeding the residual methanol steam into the fixed bed reactor from a material inlet formed in the side wall of the reactor to obtain the aromatic hydrocarbon mixture rich in BTX. The method has the advantages that the process is simple, the cost is low and the large-scale production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for preparing an aromatic hydrocarbon mixture rich in benzene, toluene and xylene by converting methanol in a fixed-bed reactor. Background technique [0002] Aromatics refer to a class of compounds containing benzene rings in their molecular structure. There are many types of such compounds, but the aromatics used on a large scale in industry refer to the so-called "triphenyls" including benzene, toluene and xylene, that is, BTX. So far, aromatics are mainly obtained from the reforming of naphtha in the petroleum processing process, and only a small amount of BTX products in the coal chemical industry come from the processing of crude benzene products in the coking process. [0003] Methanol can be obtained from coal conversion on a large scale and is an important cornerstone of the coal chemical industry. So far, a number of technologies for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C15/04C07C15/06C07C15/08C07C1/20C07C11/02C07C2/76
Inventor 李文怀张庆庚李凯旋李晓温鹏俊张西甫范辉马国强
Owner SHANXI FEISHI TECH
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