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New method for preparing isosorbide through cellulose

A technology for isosorbide and cellulose is applied in the field of reaction technology for catalyzing cellulose to prepare isosorbide, which can solve the problems of difficult industrialized production, high equipment requirements and high added value, and achieves a simplified purification process and reduced costs. Effect

Inactive Publication Date: 2013-06-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But all there is common deficiency in these methods: raw material all is the higher sorbitol of added value
Although this system prepares isosorbide directly from cellulose, it involves the use of inorganic liquid acids, which requires high equipment and is difficult to apply to industrial production

Method used

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  • New method for preparing isosorbide through cellulose
  • New method for preparing isosorbide through cellulose
  • New method for preparing isosorbide through cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0031] In eight different reactors, 150g of pure water was added, then 10g of cellulose was added, and catalyst Ru / ZrPO was added separately 41g each, tighten the screw of the reactor, fill with hydrogen 4MPa, place in eight different heating mantles respectively, raise the heating mantles to 170°C respectively, keep the temperature constant, stir, and stop the reaction after 24 hours of reaction. Cool the reaction system to room temperature, separate the reaction liquid through a liquid phase pump and introduce it into a fixed-bed reactor equipped with solid acid. The catalyst contained in the bed is 2g, and nitrogen is used as the balance gas, and the temperature is raised to 210°C , The collected reaction solution was quantitatively analyzed by high performance liquid chromatography and differential detector, and the results obtained by reacting with different solid acid catalysts are shown in Table 1.

[0032] Table 1 Different solid acid catalysts catalyze the yield of ge...

Embodiment 9-14

[0035] Add 150g of pure water into six different reactors, then add 10g of cellulose, add the catalyst Ru / ZrPO respectively 4 1g each, tighten the screw of the reactor, fill with hydrogen 4MPa, place in six different heating mantles respectively, raise the heating mantles to 170°C, keep the temperature constant, stir, and stop the reaction after 24 hours of reaction. The reaction system is cooled to room temperature, and the reaction liquid is separated and introduced into a fixed-bed reactor equipped with a solid acid through a liquid-phase pump. The catalyst contained in the bed is 2 g, and nitrogen is used as the balance gas. The bed temperature is respectively Rising to 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, the collected reaction solution was quantitatively analyzed by high-performance liquid chromatography and differential detector, and the results of the reaction at different reaction temperatures are shown in Table 3 Show.

[0036] The yield of isosorbide under tab...

Embodiment 15-20

[0040] Add 150g of pure water to the reactor, then add 10g of cellulose, add the catalyst Ru / ZrPO respectively 4 1g each, tighten the screw of the reactor, fill with hydrogen 4MPa, place in the heating mantle, raise the heating mantle to 170°C, keep the temperature constant, stir, and stop the reaction after 24 hours of reaction. Cool the reaction system to room temperature, separate the reaction solution and introduce it into a fixed-bed reactor equipped with solid acid through a liquid-phase pump. The catalyst contained in the bed is 2g, and nitrogen is used as the balance gas, and the temperature is raised to 230°C . The reaction solution was collected regularly, and quantitatively analyzed by high performance liquid chromatography and differential detector. The results obtained under different reaction times are shown in Table 4.

[0041] The yield of isosorbide under the different reaction times of table 4

[0042]

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Abstract

The invention relates to a method for preparing isosorbide through cellulose, and belongs to the preparation field of synthesizing renewable energy sources and chemicals by utilizing of biomasses. The method comprises a step of hydrolyzing the cellulose under a dual-function catalyst of metal-solid acid and adding hydrogen to obtain reaction liquid containing sorbitol, and a step of catalyzing and dehydrating the reaction liquid containing the sorbitol through the solid acid to obtain the isosorbide. According to the method, liquid acid does not need to be added, the reaction liquid containing the sorbitol does not need to be separated and purified, wherein the reaction liquid is obtained by hydrolyzing the cellulose and adding the hydrogen. The method has the advantages that raw material is the cellulose which is abundant, low in cost and environment-friendly, the yield of the isosorbide reaches up to 56.3%, the catalyst is easy to separate and recycle, a very valuable new channel is provided for transferring the cellulose into high value-added chemicals, and the method has a good industrialization application prospect.

Description

technical field [0001] The invention relates to a method for preparing isosorbide from cellulose, which belongs to the field of utilizing biomass to synthesize renewable energy and chemical preparation. More specifically, it relates to a reaction process for preparing isosorbide from catalyzed cellulose. Background technique [0002] Today, major fossil fuels such as coal, oil, and natural gas are increasingly depleted, and biomass resources have attracted widespread attention because of their sustainability, cleanliness, wide range of sources, and safety. Including the production of renewable energy and the synthesis of high value-added chemicals. Cellulose is the most productive renewable resource on the earth, with abundant sources. The world produces up to 150 billion tons of dry matter through photosynthesis of plants every year, of which cellulose and hemicellulose account for two-thirds of the total. In terms of chemical composition, cellulose is a linear macromolec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D493/04
Inventor 王艳芹席金旭金铃卢冠忠刘晓晖任家文郭耘郭杨龙王筠松张志刚龚学庆
Owner EAST CHINA UNIV OF SCI & TECH
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