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Method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic conversion on corn cobs

A catalytic conversion and corn cob technology, applied in the preparation of propylene glycol and glycerol, and the field of ethylene glycol, can solve the problems of environmental pollution, difficult to carry out, large acid concentration and dosage, and achieve sustainable utilization and pressure relief. Effect

Active Publication Date: 2010-05-12
JIANGSU SOPO GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction is not easy to carry out at room temperature, and high temperature and high pressure conditions are especially required in actual production; in the process of producing furfural from corncobs, multiple dehydration is required, the energy consumption is high, and the yield of furfural is relatively low; The concentration and dosage are relatively large, causing serious environmental pollution

Method used

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  • Method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic conversion on corn cobs
  • Method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic conversion on corn cobs
  • Method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic conversion on corn cobs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 Production of xylose by acid hydrolysis of corncobs

[0014] Add 200ml of a certain concentration of dilute acid to 25g of 80-100mesh corn cobs, heat to 100°C under constant stirring, and the hydrolysis time is 5h. After hydrolysis, centrifuge the solution, transfer the supernatant to a 500ml volumetric flask, collect the residue after centrifugation and the residue on the filter paper, wash with deionized water, and transfer the washing liquid to the volumetric flask. Finally, the volume was adjusted to 500ml. The residue was dried in a vacuum oven and weighed. The concentration of xylitol is quantitatively analyzed by high-performance liquid chromatography, and the yield of xylose reaches more than 30%.

[0015] The xylose aqueous solution with constant volume for the first time is used as the washing solution for the residue after the second corncob hydrolysis. After the second corn cob hydrolysis, the solution was centrifuged, the supernatant was transf...

Embodiment 2

[0016] Embodiment 2 Preparation of hydrogenation and cracking catalyst

[0017] After dissolving a certain quality of the two metal salt solutions in water, add the dried carrier, stir into a uniform muddy state, immerse at room temperature for 24 hours, and then dry for 12 hours. The prepared catalyst is used for the next conversion experiment after hydrogen reduction or chemical reduction.

[0018] See Table 1 for details of all prepared catalysts.

[0019] Table 1

[0020] Catalyst number

Embodiment 3

[0021] Example 3 Preparation of xylitol by hydrogenation of xylose aqueous solution

[0022] In this example, the catalytic performance of the prepared catalyst for producing xylitol from xylose at a relatively low temperature was studied.

[0023] Experimental process: 5 g of catalyst and 150 g of 10% xylose aqueous solution were added to a 600 ml autoclave, and the air was replaced 5 times after sealing. Heat the reaction vessel, and when the temperature reaches 90°C, fill it with hydrogen at a pressure of 5 MPa, stir rapidly, and start timing the reaction. After 4 hours, the stirring was stopped, and the hydrogen gas was released after the temperature of the reaction kettle was lowered to room temperature. Sampling analysis, quantitative analysis of xylose and xylitol using liquid chromatography-differential refractive index detector analysis. The catalyst evaluation results are shown in Table 2.

[0024] Table 2

[0025] Numbering

[0026] Numbering ...

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PUM

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Abstract

Corn cobs are important biomass resources. For a long time, the corn cobs have low chemical utilization ratio or cannot be utilized sufficiently to cause a great waste of resources. The invention develops a method for preparing ethylene glycol, propylene glycol and glycerine by carrying out catalytic hydrocracking conversion on the corn cobs, wherein the product is an important polyester synthetic chemical raw material. The corn cobs are efficiently converted into low carbon polyol products by the processes of acid-catalyzed hydrolysis, catalytic hydrogenation conversion and cracking. The yield of xylose in the hydrolytic process reaches over 30 percent; the conversion rate in the hydrogenation process reaches over 90 percent; and the selectivity in the hydrogenation process reaches over 90 percent.

Description

technical field [0001] The invention relates to a preparation method of ethylene glycol, propylene glycol and glycerin, in particular to a method for preparing ethylene glycol, propylene glycol and glycerin by catalytic conversion of corn cobs. Background technique [0002] Corncob is an important biomass resource. As a by-product of corn, there is an annual output of about 20 million tons. For a long time, corn cobs have been used as agricultural wastes, which are directly burned, and the chemical utilization rate is very low, or cannot be fully utilized, resulting in a great waste of resources. Therefore, it is necessary to develop a new way of chemical utilization of corn cob, make full use of this renewable resource to produce commonly used chemical raw materials and chemicals, effectively alleviate the pressure of fossil resources such as petroleum and improve the utilization efficiency of renewable resources. [0003] There are many reports on the study of corn cob by...

Claims

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Application Information

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IPC IPC(8): C07C29/00C07C31/20C07C31/22B01J23/83B01J23/755B01J23/75B01J23/72B01J23/80
CPCY02P20/52
Inventor 徐杰于维强宋勤华苗虹邵守言高进凌晨黄义争曹宏兵
Owner JIANGSU SOPO GRP
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