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Method and device for preparing sorbitol through continuous hydrogenation of glucose

A technology of sorbitol and glucose, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as hydrogen loss, achieve low unit consumption, good effect, and stable system operation

Pending Publication Date: 2019-02-05
吉林省石油化工设计研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The released gas is hydrogen and water vapor. Although the danger is reduced by means of flame arresters and high-altitude emissions, it is still a source of danger and at the same time causes hydrogen loss.

Method used

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  • Method and device for preparing sorbitol through continuous hydrogenation of glucose
  • Method and device for preparing sorbitol through continuous hydrogenation of glucose
  • Method and device for preparing sorbitol through continuous hydrogenation of glucose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Step 1, prepare 80°C glucose solution with 40wt% concentration (containing about 100ppm Na+ and 220ppm Cl - impurities), and adjust the pH to 6-7 with HCl;

[0080] In the second step, the glucose solution and hydrogen are added to the fixed bed reactor to carry out the first hydrogenation reaction; RaneyNi catalyst is used, the reactor pressure is 10.5MPa, the temperature is controlled at 90°C, and the material residence time is 1 hour;

[0081] In the third step, the reaction solution obtained in the first hydrogenation reaction is added to the slurry bed reactor to carry out the second hydrogenation reaction; an activated carbon-supported Ru catalyst is used; the reactor pressure is 11.0MPa, and the temperature is controlled at 100°C. Material residence time 1 hour

[0082] In the 4th step, the temperature of the reaction liquid obtained in the second hydrogenation reaction is lowered, and the hydrogen is recovered, and after the catalyst is removed, the crude produ...

Embodiment 2

[0085] Step 1, prepare 90°C glucose solution with 50wt% concentration (containing about 100ppm Na+ and 220ppm Cl - impurities), and adjust the pH to 6-7 with HCl;

[0086] In the second step, glucose liquid and hydrogen are added to the fixed bed reactor to carry out the first hydrogenation reaction; RaneyNi catalyst is used, the reactor pressure is 12.5MPa, the temperature is controlled at 130°C, and the material residence time is 3 hours;

[0087] In the third step, the reaction liquid obtained in the first hydrogenation reaction is added to the slurry bed reactor to carry out the second hydrogenation reaction; an activated carbon-supported Ru catalyst is used; the reactor pressure is 13.5MPa, and the temperature is controlled at 140°C. Material residence time 1 to 3 hours

[0088]In the 4th step, the temperature of the reaction liquid obtained in the second hydrogenation reaction is lowered, and the hydrogen is recovered, and after the catalyst is removed, the crude produc...

Embodiment 3

[0091] Step 1, prepare 85°C glucose solution with 45wt% concentration (containing about 100ppm Na+ and 220ppm Cl - impurities), and adjust the pH to 6-7 with HCl;

[0092] In the second step, glucose liquid and hydrogen are added to the fixed-bed reactor to carry out the first hydrogenation reaction; RaneyNi catalyst is used, the reactor pressure is 11.5MPa, the temperature is controlled at 120°C, and the material residence time is 2 hours;

[0093] In the third step, the reaction solution obtained in the first hydrogenation reaction is added to the slurry bed reactor to carry out the second hydrogenation reaction; the Ru catalyst supported by activated carbon is used; the reactor pressure is 12.0MPa, and the temperature is controlled at 125°C. Material residence time 2 hours

[0094] In the 4th step, the temperature of the reaction liquid obtained in the second hydrogenation reaction is lowered, and the hydrogen is recovered, and after the catalyst is removed, the crude prod...

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Abstract

The invention relates to a method and a device for preparing sorbitol through continuous hydrogenation of glucose, and belongs to the technical field of hydrogenated production of sorbitol. A new process for producing the sorbitol through continuous flowing hydrogenation is provided, the key problems in continuity and upsizing of large-scale sorbitol production equipment are effectively solved, and the hydrogenation reaction is more safe, reliable and thorough; the method and the device are widely applied to production of biomass chemical alcohols, the method is superior to intermittent and semi-continuous methods in conventional processes, and the reaction efficiency is improved greatly; the method and the device are applied to production of the biomass chemical alcohols such as sorbitol,xylitol and mannitol.

Description

technical field [0001] The invention relates to a method and a device for continuously hydrogenating glucose to prepare sorbitol, and belongs to the technical field of hydrogenating sorbitol. Background technique [0002] Sorbitol, mannitol, xylitol, and maltitol are all edible sugar alcohols, and they are also raw materials for the production of vitamin C, span, tween, and phytochemical alcohols, and have a wide range of uses. At present, sorbitol has been widely used in medicine, surfactant, daily chemical industry, food processing and other industries. [0003] The industrial production of sorbitol is mainly based on the hydrogenation of glucose: in the presence of a catalyst at a certain temperature, hydrogen gas undergoes a reduction reaction with glucose liquid in a reactor to form sorbitol. During the hydrogenation process of glucose, a large amount of heat will be released, and the expansion of the gas in the kettle will cause the system to overpressure, which wil...

Claims

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Application Information

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IPC IPC(8): C07C29/141C07C31/26B01J23/89
CPCC07C29/141B01J23/892C07C31/26Y02P20/129
Inventor 金智慧张海云赵晶毅李雪赵长明徐光刘瑞王楠王国俊王世君
Owner 吉林省石油化工设计研究院
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