One-step preparation method for tetrahydrofuran by employing maleic anhydride gas phase hydrogenation

A technology for tetrahydrofuran and maleic anhydride, applied in the field of one-step preparation of tetrahydrofuran, can solve the problems of high content of by-product butyric acid, increased investment cost of corrosion reaction equipment, expensive catalyst production cost, etc., achieves high conversion rate and selectivity, improves productivity, The effect of reducing production costs

Active Publication Date: 2012-08-01
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical process uses precious metals, resulting in expensive catalyst production costs, and high content of butyric acid as a by-product, which increases investment costs for corrosion reaction equipment

Method used

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  • One-step preparation method for tetrahydrofuran by employing maleic anhydride gas phase hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, prepare 1 mol / L copper nitrate and zinc nitrate mixed solution (Cu / Zn molar ratio = 1:1), then prepare 1 mol / L sodium carbonate solution as a precipitant, and mix copper nitrate and zinc nitrate in a 70°C water bath Add the mixed solution of the sodium carbonate solution dropwise to the sodium carbonate solution, stir, stop the dropwise addition when the pH value is 7-8, and add a certain amount of γ-Al 2 o 3 (to make the γ-Al 2 o 3 The content is 10% of the total weight of the catalyst), aged for 12h, filtered, washed, dried at 110°C for 12h, and calcined at 450°C for 4h to obtain CuO-ZnO / γ-Al 2 o 3 Catalyst (the content of each component is 45 / 45 / 10 respectively).

[0034] Fill the CuO-ZnO / γ-Al prepared above in the fixed bed reactor 2 o 3 Catalyst, using maleic anhydride as raw material for gas-phase hydrogenation reaction; process conditions: 220°C, 2.2MPa, maleic anhydride liquid weight space velocity 0.05h -1 , the reaction results are shown in Table...

Embodiment 2

[0036] First, prepare 1 mol / L copper nitrate and zinc nitrate mixed solution (Cu / Zn molar ratio = 1:1), then prepare 1 mol / L sodium carbonate solution as a precipitant, and mix copper nitrate and zinc nitrate in a 70°C water bath Add the mixed solution of the solution dropwise to the sodium carbonate solution, stir, stop the dropwise addition when the pH value is 7 to 8, add a certain amount of SAPO-11 molecular sieve (make the content of the molecular sieve be 10% of the total weight of the catalyst), aging for 12h, Filter, wash, dry at 110°C for 12 hours, and bake at 450°C for 4 hours to obtain a CuO-ZnO / SAPO-11 catalyst (the content ratio of each component is 45 / 45 / 10).

[0037] Fill the CuO-ZnO / SAPO-11 catalyst prepared above in the fixed-bed reactor, and use maleic anhydride as raw material to carry out gas-phase hydrogenation reaction; the process conditions are: temperature 220 ° C, pressure 2.2 MPa, maleic anhydride liquid weight space velocity 0.05 h -1 , the reactio...

Embodiment 3

[0039] First, prepare 1 mol / L copper nitrate and zinc nitrate mixed solution (Cu / Zn molar ratio = 1:1), then prepare 1 mol / L sodium carbonate solution as a precipitant, and mix copper nitrate and zinc nitrate in a 70°C water bath Add the mixed solution dropwise to the sodium carbonate solution, stir, stop the dropwise addition when the pH value is 7 to 8, add a certain amount of β molecular sieve (making the content of the molecular sieve be 10% of the total weight of the catalyst), aging for 12h, filter, Washing, drying at 110° C. for 12 hours, and calcining at 450° C. for 4 hours to obtain a CuO-ZnO / β molecular sieve catalyst (the content ratio of each component of the catalyst is 45 / 45 / 10).

[0040] Fill the CuO-ZnO / β catalyst prepared above in a fixed-bed reactor, and use maleic anhydride as a raw material to carry out gas-phase hydrogenation reaction; the process conditions are: temperature 220°C, pressure 2.2MPa, maleic anhydride liquid weight space velocity 0.05h -1 , t...

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Abstract

The invention relates to a one-step preparation method for tetrahydrofuran, the method comprises the following steps: taking maleic anhydride as a raw material, under the condition of a hydrogenation-dehydration bifunctional catalyst, carrying out a maleic anhydride hydrogenation preparation to obtain tetrahydrofuran, the hydrogenation-dehydration bifunctional catalyst is CuO-ZnO / solid acid, wherein the solid acid is ZSM-5, beta or Y, SAPO-11 molecular sieve, gamma-Al2O3 and the like; the invention also provides an application of the ydrogenation-dehydration bifunctional catalyst in above reaction. The method of the invention has the advantages of complete conversion rate of maleic anhydride, high selectivity of tetrahydrofuran, simple reaction process and the like.

Description

technical field [0001] The invention relates to a method for preparing tetrahydrofuran in one step. Specifically, the invention relates to a method for producing tetrahydrofuran in one step through gas-phase hydrogenation using maleic anhydride (ie maleic anhydride) as raw material. Background technique [0002] Tetrahydrofuran is an important organic chemical intermediate. Due to its high polarity, low boiling point (66°C) and low toxicity, it is usually used as an excellent solvent and can dissolve all polymers except polyethylene, polypropylene and fluororesin. , especially suitable for PVC, polyvinylidene fluoride resin and butylaniline; at the same time, it is widely used in the preparation of surface coatings, anti-corrosion coatings and film coatings, as well as in organic chemical reactions such as polymerization and esterification. Another important use of tetrahydrofuran is for the production of polytetramethylene ether glycol (PTMEG) and the manufacture of polyure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/08B01J23/80B01J29/46B01J29/76B01J29/14B01J29/85
Inventor 朱玉雷丁国强李永旺周明君
Owner SYNFUELS CHINA TECH CO LTD
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