Industrialized production process of benzoic anhydride

A technology of phthalic anhydride and industrial naphthalene, which is applied in the field of fixed-bed gas-phase catalytic oxidation to produce phthalic anhydride, can solve problems such as easy blockage of nozzles, insufficient and uniform mixing of naphthalene and air, and incomplete vaporization of industrial naphthalene, so as to avoid clogging, easy control, and high efficiency. Yield effect

Active Publication Date: 2008-11-05
山西宏特煤化工有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is that the jet mixing nozzle in the prior art is easy to block,

Method used

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  • Industrialized production process of benzoic anhydride
  • Industrialized production process of benzoic anhydride
  • Industrialized production process of benzoic anhydride

Examples

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Embodiment Construction

[0064] The 40,000 tons / year production plant of producing phthalic anhydride with industrial naphthalene is example below, introduces the present invention in more detail.

[0065] The technical process of industrial naphthalene of the present invention producing phthalic anhydride is as figure 2 shown.

[0066] After the industrial naphthalene is heated and completely vaporized in the vaporizer, it is mixed with the heated and pressurized air through the Venturi tube and enters the naphthalene-air mixer. The fully and uniformly mixed naphthalene-air mixture enters the fixed-bed catalytic reactor for catalytic oxidation to produce Phthalic anhydride.

[0067] In order to ensure that the product phthalic anhydride yield can reach 106%, one of the key processes is complete vaporization of industrial naphthalene and sufficient mixing with air, so different vaporization and mixing methods of industrial naphthalene have a direct impact on the yield of phthalic anhydride.

[0068...

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Abstract

A method for manufacturing phthalic anhydride by industrial naphthalene includes the following steps: 1) the industrial naphthalene is heated in a carburetor until being completely vaporized; 2) the vaporized naphthalene enters a naphthalene-air mixer by a venturi tube and is fully mixed with the reaction air; 3) the fully mixed naphthalene-air mixing air enters a fixed bed vapor phase reactor for reaction, and then the phthalic anhydride is obtained. The method can be used for leading the industrial naphthalene to be completely vaporized and fully mixed with the air, thereby improving the yield of the phthalic anhydride and simultaneously being capable of solving the problem that the nozzle in the conventional ejection type vaporization technique is easy to be plugged.

Description

technical field [0001] The invention relates to a method for producing phthalic anhydride by fixed-bed gas-phase catalytic oxidation, in particular to a method for producing phthalic anhydride by fixed-bed gas-phase catalytic oxidation of industrial naphthalene as a raw material. Background technique [0002] The production process of phthalic anhydride (also known as phthalic anhydride) is divided into naphthalene method and o-xylene method (O-X) according to different raw materials. From the 1980s to the present, phthalic anhydride production in various countries in the world mostly adopts the 60-80g process technology developed by German DAVY, Lurgi and BASF companies, Italian LONZA companies, and Japanese touch coal companies, but all use o-xylene as raw material. So far, the overall process technology has not been improved much. my country's Jinling Petrochemical, Qilu Petrochemical, etc. have introduced the process technology of Lurgi Company with o-xylene as raw materi...

Claims

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Application Information

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IPC IPC(8): C07D307/89B01J19/26
Inventor 吴连生邱建中叶欲章李玉财辛文亮
Owner 山西宏特煤化工有限公司
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