Method for producing tetrahydrofuran

A technology of tetrahydrofuran and hydrogen esters, which is applied in the field of tetrahydrofuran production, can solve the problems of catalyst deactivation, low hourly space velocity of ester liquid, and increased selectivity of by-products, and achieve high catalytic activity and good selectivity

Active Publication Date: 2010-11-24
HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this technology are: (1) The reaction pressure and hydrogen ester molar ratio are high, and the hourly space velocity of the ester liquid is too low; (2) The temperature rise of the catalyst bed is easy to be too large during the one-step hydrogenation reaction process, resulting in the selectivity of by-products increase and deactivation of the catalyst

Method used

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  • Method for producing tetrahydrofuran
  • Method for producing tetrahydrofuran
  • Method for producing tetrahydrofuran

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11

[0020] according to the invention figure 1 The technological process of this method uses different catalysts and cooperates with suitable technological conditions to carry out hydrogenation reaction with dimethyl maleate as a raw material. The specific conditions and reaction results are shown in Table 1, Table 2 and Table 3.

[0021] Table 1 Catalysts of Examples 1 to 11

[0022]

[0023]

[0024] .

Embodiment 12

[0026] Adopt the catalyzer of embodiment 3, dimethyl maleate is hydrogenated to produce tetrahydrofuran reaction and investigate, through 1500 hours of life test, catalyst activity and stability all maintain at relatively high level, and catalyst bed temperature rise is little and The n-butanol by-product is effectively controlled.

[0027]

[0028] Note: (1) Dimethyl maleate is completely converted into dimethyl succinate, and the conversion rate in the table refers to the conversion rate of dimethyl succinate; (2) The ester space velocity is 0.38g / (ml .h), the hydrogen ester molar ratio is 40, and the pressure is 3.0MPa.

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Abstract

The invention discloses a method for producing tetrahydrofuran by using dimethyl maleate as a raw material and adopting two sections of hydrogenation processes. In a first hydrogenation section, a supported hydrogenation catalyst taking VIII-group metals as active ingredients is adopted; and in a second hydrogenation section, a supported CuO catalyst is adopted. The method has the advantages of high catalytic reactivity, relatively higher catalyst stability, high tetrahydrofuran selectivity, low byproduct selectivity and the like; when continuously operated for not longer than 1,500 hours, the percent conversion of the raw material reaches 100 percent, the tetrahydrofuran selectivity reaches over 95 percent, and the selectivity of a byproduct normal butanol is below 4 percent.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a method for hydrogenating dimethyl maleate to produce tetrahydrofuran. Background technique [0002] Tetrahydrofuran (THF) has the characteristics of low toxicity, low boiling point, and good fluidity. It is an important raw material for organic synthesis and an excellent solvent, and has a wide range of uses. The most important use of THF is to produce polytetrahydrofuran glycol (PTMEG). According to rough statistics, more than 80% of THF in the world is used to produce PTMEG, and PTMEG is mainly used to produce elastic spandex fibers. Since the domestic spandex anti-dumping, the domestic spandex industry has begun to recover, coupled with the rise in product prices has attracted domestic enterprises to accelerate the pace of production capacity expansion, currently PTMEG is in short supply. [0003] CN 1762586A, CN 1743068A disclose the supported Cu-B catalyst prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/08B01J23/755B01J23/889B01J23/89B01J23/44B01J23/80B01J23/83B01J23/86B01J27/224B01J23/72
Inventor 李庆华向明林
Owner HUNAN CHANGLING PETROCHEM SCI & TECH DEV CO LTD
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