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Method for preparing 1,2-propanediol using biomass derivative lactic acid

A technology for derivatives and propylene glycol, applied in the field of preparing 1,2-propylene glycol, can solve the problems of low yield of 1,2-propylene glycol, harsh reaction conditions, depletion of reserves, etc., to reduce reaction energy consumption, reduce reaction by-products, The effect of less environmental pollution

Inactive Publication Date: 2016-09-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the 1,2-propanediol synthesis method widely used in industry at home and abroad is mainly produced by catalytic hydration of propylene oxide. This process mainly has follow-up equipment (evaporation, rectification) long process or harsh reaction conditions, high energy consumption, 1,2-propanediol has disadvantages such as low yield, and due to the non-renewability of petroleum resources, reserves are bound to be exhausted day by day, so it is imperative to produce 1,2-propanediol with renewable raw materials

Method used

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  • Method for preparing 1,2-propanediol using biomass derivative lactic acid
  • Method for preparing 1,2-propanediol using biomass derivative lactic acid
  • Method for preparing 1,2-propanediol using biomass derivative lactic acid

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Embodiment 1

[0040] This example relates to a method for preparing 1,2-propanediol by hydrothermal conversion of metal element (Zn powder) and metal oxide (CuO powder) to lactic acid. The reaction equation is as follows:

[0041]

[0042] The method comprises the steps of:

[0043] Lactic acid (75mg, reaction concentration is 7.14g / L), Zn powder (30mmol) and CuO powder (5mmol) are packed in the hydrothermal reactor of Teflon liner successively, add water and make reactor filling rate 35%, to reaction Fill the reactor with nitrogen to eliminate the interference of air and seal it. Put the reactor into an oven to make the reaction temperature 250°C, and the reaction time is 120 minutes. After the reaction, take out the mixture and filter to obtain 1,2-propanediol.

[0044] After the reaction, the product was characterized by GC / MS (see figure 1 ) and HPLC quantitative analysis (see figure 2 ), GC / MS qualitative analysis shows that 1,2-propanediol is the main product, and HPLC quantitat...

Embodiment 2

[0046] This embodiment relates to a method for preparing 1,2-propanediol by hydrothermal conversion of metal element (Zn powder) and metal oxide (CuO powder) to lactic acid. The method includes the following steps:

[0047] Lactic acid (75mg, reaction concentration is 10g / L), Zn powder (30mmol) and CuO powder (5mmol) are packed in the hydrothermal reactor of Teflon liner successively, add water to make the reactor filling rate 25%, add to reactor Fill the reactor with nitrogen to eliminate the interference of the air and seal it. Put the reactor into an oven to make the reaction temperature 250°C, and the reaction time is 120 minutes. After the reaction, take out the mixture and filter to obtain 1,2-propanediol.

[0048] GC / MS qualitative analysis and HPLC quantitative analysis were performed on the reacted product. GC / MS qualitative analysis showed that 1,2-propanediol was the main product, and HPLC quantitative analysis showed that the yield could reach up to 86%.

Embodiment 3

[0050] This embodiment relates to a method for preparing 1,2-propanediol by hydrothermal conversion of metal element (Zn powder) and metal oxide (CuO powder) to lactic acid. The method includes the following steps:

[0051] Lactic acid (75mg, reaction concentration is 25g / L), Zn powder (30mmol) and CuO powder (3mmol) are packed in the hydrothermal reactor of Teflon liner successively, add water to make the reactor filling rate 10%, add to reactor Fill the reactor with nitrogen to eliminate the interference of the air and seal it. Put the reactor into an oven to make the reaction temperature 250°C, and the reaction time is 120 minutes. After the reaction, take out the mixture and filter to obtain 1,2-propanediol.

[0052]GC / MS qualitative analysis and HPLC quantitative analysis were performed on the reacted product. GC / MS qualitative analysis showed that 1,2-propanediol was the main product, and HPLC quantitative analysis showed that the yield could reach up to 90%.

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Abstract

The invention discloses a method for preparing 1,2,-propylene glycol by use of a biomass derivative; the method comprises the following steps: sequentially adding a reducing agent, a catalyst and a lactic acid solution into a hydrothermal reactor; filling nitrogen into the hydrothermal reactor and sealing the hydrothermal reactor; putting the hydrothermal reactor at 150 to 300 DEG C to react for 30-210min; after the reaction, filtering to obtain the 1, 2-propylene glycol. According to the method, the 1, 2-propylene glycol can be efficiently and highly-selectively synthesized, a renewable biomass derivative widely existing in the nature is used as a raw material, consumption of a large amount of conventional fossil fuels can be avoided, the need to prepare a complex high efficiency catalyst is eliminated, the method has the advantages of simple operation, high conversion rate, no need of pure hydrogen, and little pollution to the environment due to use of water as a hydrogen source and reaction solvent, and is beneficial to industrial production.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and in particular relates to a method for preparing 1,2-propanediol by utilizing a biomass derivative lactic acid. Background technique [0002] Since the beginning of the 21st century, with the pace of global modernization, fossil fuels have a potential energy shortage crisis, especially gasoline refined from petroleum, which is one of the reasons for the global oil crisis. Therefore, reducing dependence on fossil fuels and developing new renewable clean energy sources have attracted more and more attention. At present, the 1,2-propanediol synthesis method widely used in industry at home and abroad is mainly produced by catalytic hydration of propylene oxide. This process mainly has follow-up equipment (evaporation, rectification) long process or harsh reaction conditions, high energy consumption, 1,2-propanediol has disadvantages such as low yield, and due to the non-renew...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/147C07C29/149
CPCC07C29/147C07C29/149C07C31/205
Inventor 霍志保肖杰锋任德章罗将李路金放鸣
Owner SHANGHAI JIAOTONG UNIV
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