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A method for preparing propylene glycol type antifreeze from natural lignocellulosic raw materials

A technology of lignocellulose and propylene glycol, which is applied in hydrogenation preparation, hydroxyl elimination preparation, sugar derivative preparation, etc., can solve the problems of ethylene glycol toxicity, difficult separation of products, low reaction efficiency, etc. High price and high conversion efficiency

Active Publication Date: 2019-11-05
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction efficiency of directly using crops to prepare diols is generally very low, and the obtained products are complex and difficult to separate. Therefore, in order to obtain pure diol final products, multiple complex and energy-consuming separation steps are required.
[0009] The current domestic market is mainly based on antifreeze solutions rich in ethylene glycol, but ethylene glycol is toxic, and its metabolites are glycolaldehyde, glycolic acid and glyoxylic acid are relatively toxic, and it is easy to cause accidental ingestion. poisoned

Method used

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  • A method for preparing propylene glycol type antifreeze from natural lignocellulosic raw materials
  • A method for preparing propylene glycol type antifreeze from natural lignocellulosic raw materials
  • A method for preparing propylene glycol type antifreeze from natural lignocellulosic raw materials

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Experimental program
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Embodiment 1

[0038] Pretreatment of natural lignocellulosic feedstock:

[0039] The straw is added into the NaOH solution, the NaOH solution is heated to 80° C., and the straw is heat-treated in the NaOH solution for 10 to 80 hours. adding the straw heat-treated in the NaOH solution into the triethylamine solution, heating the triethylamine solution to 90° C., and heat-treating the straw in the triethylamine solution for 100 h.

Embodiment 2

[0041] Weigh 2g of platinum tetrachloride and dissolve it in 50ml of deionized water, add an activated carbon carrier prepared from dried coconut shells, and add nickel nitrate at the same time, rotate and evaporate at room temperature until there is no water, and then place it in a vacuum drying oven for drying. Put the dried solid into the reaction kettle, and carry out reduction reaction with the incoming hydrogen, the reduction temperature is 350° C., and the reduction time is 4 hours, to obtain the catalyst Pt-Ni / C (coconut shell).

Embodiment 3

[0043] After mixing 40g of pretreated stalks and 100ml of water, add them to a slurry bed reactor, add 0.5g of catalyst Pt-Ni / C (graphene) at the same time, and feed 3MPa hydrogen; after heating to 240°C, The reaction was maintained for 1 h, nitrogen was replaced three times, and the stirring speed was 650 rpm to obtain a mixed solution mainly composed of propylene glycol; after the mixed solution was cooled to room temperature, the stirring was stopped and the gas was discharged.

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Abstract

The invention provides a method for preparing a propylene glycol type antifreezing solution from natural lignocellulose raw materials. Straw, corn cobs, and other lignocellulose biomass are used as raw materials, an aqueous solution is added into a slurry bed reactor, and with the effects of a catalyst, an aqueous solution product whose main component is propylene glycol is obtained; distillation or membrane separation and other methods are used for changing the concentration of the aqueous solution of propylene glycol in order to blend the high-quality propylene glycol type antifreezing solution with green and environmental protection. The method has the advantages of cheap and easily available raw materials, high product value, mild reaction process, and high conversion efficiency; waste biomass is used for reaction, and application values of waste lignocellulose materials are substantially improved.

Description

technical field [0001] The invention specifically relates to a method for preparing propylene glycol type antifreeze from lignocellulosic waste crops. Background technique [0002] With the continuous development and utilization of fossil resources such as oil, coal, and natural gas, a series of problems such as shortage of energy chemicals and environmental pollution have arisen. Based on the needs of environmental protection and sustainable development, waste crops, as raw materials for sustainable regeneration, are receiving more and more attention and research because of their extremely cheap and easy availability. Waste biomass includes waste and residues from agricultural production, forest and forestry processing waste, grasses and other plants. It is the most abundant renewable resource on the earth. Partial composition. Among the waste plants from various sources, generally cellulose accounts for 40-60%, lignin accounts for 20-30%, and hemicellulose accounts for 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/20C07C29/141C07C29/145C07C29/60C07C29/17C07C31/20B01J23/89
CPCB01J23/892C07C29/141C07C29/145C07C29/172C07C29/60C07C45/59C07H1/00C07H3/02C09K5/20C07C31/205C07C47/19C07C49/17
Inventor 赵晨骆治成褚大旺郑朝霞
Owner EAST CHINA NORMAL UNIV
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