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Method for preparing methyl levulinate by utilizing plant straws

A technology of methyl levulinate and plant straw, applied in the field of preparation of methyl levulinate

Inactive Publication Date: 2014-01-08
INNER MONGOLIA JINDI BIOMASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013]The method of using solid acid as a catalyst to catalyze plant straw to prepare levulinic acid can improve the corrosion of equipment and environmental pollution to a certain extent, but the The yield of levulinic acid produced by the method is still very low, and the solid acid catalyst cannot be separated from the woody residue, and remains in the woody residue, which limits the reuse of the woody residue to a large extent.

Method used

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  • Method for preparing methyl levulinate by utilizing plant straws
  • Method for preparing methyl levulinate by utilizing plant straws
  • Method for preparing methyl levulinate by utilizing plant straws

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Preparation of raw materials:

[0049] Crushing wheat stalks with a water content of 15% into 5-10mm straw fragments for later use;

[0050] 2. Acid hydrolysis

[0051] Mix the wheat straw fragments with the heavy superphosphate solution and stir evenly to form a straw slurry, wherein the mass percent concentration of the heavy superphosphate solution is 5%, and the weight ratio of the straw fragments to the heavy superphosphate solution is 1:0.3 ;

[0052] The straw pulp is pressed into the first reactor with a high-pressure screw pump, and at the same time, high-pressure steam is introduced into the first reactor to increase the temperature and pressure in the first reactor, and the first stage of acid hydrolysis treatment is carried out. Obtain the first acid hydrolysis mixture, wherein, the temperature of the high-pressure steam is 230°C, the absolute pressure is 2.6MPa, the acid hydrolysis treatment temperature of the first stage is controlled to be 230°C, the...

Embodiment 2

[0074] 1. Preparation of raw materials:

[0075] The sunflower seed shells with a water content of 5% are crushed into 1-3mm sunflower shell fragments for later use;

[0076] 2. Acid hydrolysis

[0077] Mix sunflower husk fragments with heavy superphosphate solution, stir evenly to form straw slurry, wherein the mass percent concentration of heavy superphosphate solution is 8%, and the weight ratio of straw fragments to heavy superphosphate solution is 1: 0.1;

[0078] The straw pulp is pressed into the first reactor with a high-pressure screw pump, and at the same time, high-pressure steam is introduced into the first reactor to increase the temperature and pressure in the first reactor, and the first stage of acid hydrolysis treatment is carried out. Obtain the first acid hydrolysis mixture, wherein the temperature of the high-pressure steam is 240°C, the absolute pressure is 3.1MPa, the pressure treatment temperature is controlled to be 235°C, the absolute pressure is 3.0...

Embodiment 3

[0096] 1. Preparation of raw materials:

[0097] The reed stalks with a water content of 10% are crushed into straw fragments of 3-5 mm for later use;

[0098] 2. Acid hydrolysis

[0099] Mix reed stalk fragments with heavy superphosphate solution, stir evenly to form straw pulp, wherein the mass percent concentration of heavy superphosphate solution is 6.5%, and the weight ratio of straw fragments to heavy superphosphate solution is 1:0.2 ;

[0100] The straw pulp is pressed into the first reactor with a high-pressure screw pump, and at the same time, high-pressure steam is introduced into the first reactor to increase the temperature and pressure in the first reactor, and the first stage of acid hydrolysis treatment is carried out. Obtain the first acid hydrolysis mixture, wherein the temperature of the high-pressure steam is 245°C, the absolute pressure is 2.2MPa, the acid hydrolysis treatment temperature of the first stage is controlled to be 240°C, the absolute pressure...

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Abstract

The invention discloses a method for preparing methyl levulinate by utilizing plant straws, comprising the steps of: (1) leading the plant straws and triple superphosphate to undergo acid hydrolysis reaction to prepare levulinate; and (2) undergoing esterification reaction on the levulinate and methyl alcohol. For the methyl levulinate prepared with the method, the yield is high, the purity of products is high, the yield of levulinic acid as an intermediate product prepared by reaction of the straws and the triple superphosphate and hydrolysis under the conditions of high temperature and high pressure is high, the triple superphosphate is degraded gradually in reaction to form acidity in medium, H<+> ions are softly released, the polymerization and the coking of reactants are effectively inhabited, the yield of the levulinic acid as an intermediate product is high, the corrosion to the equipment is less, the process is simple and the environmental pollution is less.

Description

technical field [0001] The invention relates to a carboxylic acid ester and a preparation method thereof, in particular to a preparation method of methyl levulinate prepared by reacting levulinic acid with hydroxyl groups of organic compounds. Background technique [0002] Methyl levulinate is a light yellow, transparent oily compound, a high-efficiency diesel additive, and can also be used alone as a clean fuel. The product quality meets the requirements of the EN590 standard, and the emission meets the requirements of the ULSD standard. This product can reduce greenhouse gas emissions by 96%, and is allowed to be blended with petroleum diesel at a ratio of 65% in Europe. Compared with grease biodiesel, the cost is reduced by 50%, but the sales price is more than 30%. And it has the characteristics of biodegradability, low condensation, good oxidation stability, etc., and it is the development direction of high-grade diesel fuel. [0003] The structural formula of methyl ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/716C07C67/08C07C59/185C07C51/00
Inventor 王建钢
Owner INNER MONGOLIA JINDI BIOMASS
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