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Hydrogenation technology of sugar alcohol

A process and technology of sugar alcohol, which is applied in the field of sugar alcohol preparation, can solve the problems of difficult availability of supported catalysts, limited solubility of lime and magnesium oxide, etc., and achieve the effects of low cost, reduced nickel ions, and improved operating efficiency

Inactive Publication Date: 2019-02-15
ZHEJIANG HUAKANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this technical method: (1) adding several times or continuously; (2) the solubility of lime and magnesium oxide in water is limited
The main disadvantage of this method: the supported catalyst is not easy to obtain and needs to be customized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The hydrogenation process of the first described sugar alcohol of the present invention comprises the following steps:

[0034] (11) Prepare the maltose syrup as a maltose solution with a refractive index of 54% and a pH of 4.

[0035] (12) Take 10L of maltose solution, add 700g of skeleton nickel, and add magnesium powder at 0.0625% of the skeleton nickel.

[0036] (13) Then heat up the maltose solution and add hydrogen, the pressure is controlled at 5.5MPa~6.0MPa, the hydrogenation temperature is controlled at 130°C, the reaction time is 60min~70min, and when the temperature is 100°C~130°C, the stirring speed is 100rpm.

[0037] (14) Discharge after completing the follow-up process.

Embodiment 2

[0039] The hydrogenation process of the second described sugar alcohol of the present invention comprises the following steps:

[0040] (21) Prepare xylose as a xylose solution with a refractive index of 56% and a pH of 5.

[0041] (22) Take 20L of xylose solution, add 900g of skeleton nickel, and add magnesium powder at 1.5% of the skeleton nickel.

[0042] (23) Then heat up and hydrogenate the xylose solution. The pressure is controlled at 8.5MPa~9.5MPa, the hydrogenation temperature is controlled at 135°C, the reaction time is 150min~160min, and the stirring speed is 100rpm when the temperature is 100°C~130°C.

[0043] (24) Discharge after completing the follow-up process.

Embodiment 3

[0045] The hydrogenation process of the third described sugar alcohol of the present invention comprises the following steps:

[0046] (31) Configure the glucose as a glucose solution with a refractive index of 55% and a pH of 4.5.

[0047] (32) Take 15L of glucose solution, add 800g of skeleton nickel, and add magnesium powder according to 1% of the amount of skeleton nickel.

[0048] (33) Then heat up the glucose solution and add hydrogen, the pressure is controlled at 7.0MPa~8.0MPa, the hydrogenation temperature is controlled at 130°C, the reaction time is 110min~120min, and when the temperature is 100°C~130°C, the stirring speed is 100rpm.

[0049] (34) Discharge after completing the follow-up process.

[0050] The sugar alcohol finished product that above-mentioned each embodiment prepares finally is measured, draws: the maltitol content that embodiment 1 obtains improves 2.1%, conversion rate improves 0.12%, nickel ion content reduces 75.4%; The xylitol that embodiment ...

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Abstract

The invention relates to a hydrogenation technology of sugar alcohol. The hydrogenation technology comprises the processes of sequentially adding a catalyst and hydrogen into a sugar solution and raising the temperature. The hydrogenation technology is characterized by comprising the following steps: after adding the catalyst into the sugar solution and before raising the temperature of the sugarsolution and adding the hydrogen, adding magnesium powder of which the weight is 0.05 to 1.5 percent of the weight of the catalyst into the sugar solution and controlling the pH value of the sugar solution within the variation range of 5.5 to 7.0. According to the hydrogenation technology disclosed by the invention, by adding the magnesium powder when the sugar solution is hydrogenated, the pH value of the reaction process is stabilized, the content is improved, the catalyst loss in the reaction process is reduced, the quality of hydrogenated liquid is improved and refining purification is facilitated.

Description

technical field [0001] The invention belongs to the technical field of sugar alcohol preparation, in particular to a hydrogenation process of sugar alcohol. Background technique [0002] In the fields of food and chemical industry, cellulose and its derivatives, sugar and sugar alcohol, are widely used as raw materials and processed into various products. Among them, catalytic hydrogenation is a common process, and pH stability in the hydrogenation process has a great impact on the catalytic activity of metal catalysts. It has a great influence on the substrate conversion rate. By injecting liquid caustic soda, the pH of the sugar solution is raised, the hydrogenation process is unstable, and the pH is unstable; the large amount of lye used inevitably intensifies some side reactions, and the storage of liquid caustic also increases the equipment cost of the production process. [0003] There are many existing methods for maintaining pH stability. For example, the British...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H15/04C07H1/00C07C31/26C07C29/132C07C31/18
CPCC07C29/132C07H1/00C07H15/04C07C31/26C07C31/18
Inventor 安延龙谢绍勋罗家星毛宝兴毛学军
Owner ZHEJIANG HUAKANG PHARMA
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