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Preparation method of xylene by alkylation of mixed crude benzene and methanol

A technology of xylene and alkylation, which is applied in the field of mixed crude benzene and methanol to produce xylene, can solve the problems of uneconomical, difficult practical application and industrialization, etc., achieve low cost, improve economic benefits and social Benefits, low energy consumption

Inactive Publication Date: 2014-08-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that the existing technology of producing toluene or xylene by alkylation of benzene and methanol uses pure benzene as the reaction raw material to produce toluene or xylene products, and the price of benzene in industry is higher than that of toluene and slightly lower than that of xylene. It is not economical to use pure benzene as a reaction raw material to produce toluene or xylene products, and it is difficult to carry out practical application and industrialization

Method used

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  • Preparation method of xylene by alkylation of mixed crude benzene and methanol

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Experimental program
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Embodiment 1

[0027] Embodiment 1: the two ends of the stainless steel fixed-bed reaction tube of inner diameter 1.5cm are loaded with appropriate amount of glass beads, and 5.0g granular 1.0%La are loaded in the middle 2 o 3 Modified acidic ZSM-5 catalyst (molecular sieve Si / Al=32, after the carrier gas is H 2 and 5h high-temperature passivation treatment at 550°C and pickling post-treatment with 0.5M oxalic acid aqueous solution for 1h at 80°C), then the carrier gas hydrogen, H 2 The molar ratio to hydrocarbons is 1:1; according to the molar ratio, the mixed crude benzene / methanol=1 / 1 is used to input the reaction raw materials with a pump; the mixed crude benzene raw material is specifically composed of 94% benzene, 5% toluene, and 1% xylene ; At a reaction temperature of 300°C, a reaction pressure of 0.1MPa, and a reaction space velocity of 0.5h -1 Under these conditions, the alkylation reaction produces xylene. The reaction product sample was analyzed by gas chromatography, and the ...

Embodiment 2

[0028]Embodiment 2: the two ends of the stainless steel fixed-bed reaction tube of internal diameter 1.5cm are loaded with appropriate amount of glass beads, and 4.0g granular 4.2%Ce are loaded in the middle 2 o 3 Modified acidic Beta catalyst (molecular sieve Si / Al=20, after the carrier gas is H 2 and 2h high temperature passivation treatment at 750°C and 3.0M oxalic acid aqueous solution pickling treatment at 60°C for 3h), and then pass the carrier gas hydrogen, H 2 The molar ratio to hydrocarbons is 5:1; according to the molar ratio, the mixed crude benzene / methanol=6 / 1 is used to input the reaction raw materials with a pump; the mixed crude benzene raw materials are specifically composed of 30% benzene, 60% toluene, 1% xylene, 1 % non-aromatics and 8% C9 aromatics; at a reaction temperature of 460°C, a reaction pressure of 5.0MPa, and a reaction space velocity of 4.0h -1 Under these conditions, the alkylation reaction produces xylene. The reaction product sample was ana...

Embodiment 3

[0029] Embodiment 3: the two ends of the stainless steel fixed-bed reaction tube of inner diameter 1.5cm are loaded with appropriate glass beads, and the acidic SAPO-11 catalyst (molecular sieve Si / Al=12 of molecular sieve Si / Al=12, H through the carrier gas 2 and 4h high-temperature passivation treatment at 650°C and pickling post-treatment with 1.5M oxalic acid aqueous solution for 2h at 70°C), and then the carrier gas carbon dioxide, CO 2 The molar ratio to hydrocarbons is 2:1; according to the molar ratio, the mixed crude benzene / methanol=3 / 1 is used to input the reaction raw materials with a pump; the mixed crude benzene raw materials are specifically composed of 40% benzene, 47% toluene, 2.4% xylene, 6 % non-aromatics and 4.6% C9 aromatics; at a reaction temperature of 380°C, a reaction pressure of 1.0MPa, and a reaction space velocity of 2.0h -1 Under these conditions, the alkylation reaction produces xylene. The reaction product sample was analyzed by gas chromatogra...

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Abstract

The invention relates to a preparation method of xylene by alkylation of mixed crude benzene and methanol. The method uses mixed crude benzene and methanol in the molar ratio of 1-6:1 as raw materials, and the mixed crude benzene comprises 30-94% of benzene, 5-60% of toluene b, 1-6% of xylene, 0-10% of non-aromatic hydrocarbons and 0-10% of C9 aromatic hydrocarbons. The raw materials are subjected to an alkylation reaction in the presence of an acidic zeolite catalyst in a fixed bed or fluidized bed reactor under the conditions of reaction temperature at 360-460 DEG C, reaction pressure of 0-5.0 MPa, carrier gas of H2, H2O steam or CO2, so as to prepare xylene. This method can utilize coking-source benzene with surplus capacity and cheap methanol to produce xylene with high industrial added value, greatly reduces the production cost of raw materials, reduces the energy consumption and material consumption, and significantly improves the economic and social benefits of xylene production by alkylation of benzene and methanol.

Description

technical field [0001] The invention relates to a production process for producing xylene through alkylation of crude benzene and methanol, and belongs to the technical field of basic organic chemical production. Background technique [0002] Paraxylene (PX) is the most widely used C8 aromatic hydrocarbon in industry, and it is the precursor of terephthalic acid (PTA). Terephthalic acid is an important raw material for polyester industry and plastics industry. In the global PX consumption structure, more than 80% of PX is used to produce PTA. Paraxylene is also widely used in fields such as medicine, pesticides, dyes and solvents. The market demand for p-xylene has been on the rise, and the capacity shortage has always existed. [0003] The traditional process of industrial production of p-xylene is the isomerization of mixed xylene, and the second is toluene and C 9 Aromatic disproportionation and transalkylation. Patent CN200610117849.2 reports a catalyst for toluene s...

Claims

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Application Information

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IPC IPC(8): C07C2/86C07C15/08
Inventor 朱志荣
Owner TONGJI UNIV
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