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Method for preparing acetylpropionic acid by solid superacid catalysis of stalk

A technology of solid super acid and levulinic acid, which is applied in the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds. It can solve problems such as difficult operation, pollution, and environmental pollution, and achieve safe operation and no environmental pollution. , no corrosion effect

Inactive Publication Date: 2009-01-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the pollution, corrosion, difficult operation, polluted environment etc. Problem, propose a method of using solid superacid catalyst to convert straw to prepare levulinic acid, which can partially replace fossil energy and improve the utilization value of straw

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The rice straw is mechanically crushed to below 60 mesh, the solid-liquid ratio of rice straw and water: 10% (g / g); reaction temperature: from room temperature 25 ℃ to 210 ℃; reaction time: 5min; heating time: 50min; solid super Strong Acid S 2 o 8 2- / ZrO 2 -SiO 2 -Sm 2 o 3 Mass ratio with straw: 100% (g / g); stirring speed 180r / min. The yield of levulinic acid (based on the carbohydrate content in the substrate) was 17.1%.

Embodiment 2

[0028] After the steam-exploded rice straw is mechanically pulverized, the solid-liquid ratio of the steam-exploded rice straw and water: 6% (g / g); reaction temperature: from room temperature 25 ℃ to 210 ℃; reaction time: 10min; heating time: 50min; solid super Strong Acid S 2 o 4 2- / ZrO 2 -SiO 2 -Sm 2 o 3 Mass ratio to steam-exploded rice straw: 200% (g / g); stirring speed 180r / min. The yield of levulinic acid (based on the carbohydrate content in the substrate) was 44.2%.

Embodiment 3

[0030] The steam-exploded rice straw is ultra-finely crushed to a micron-sized steam-exploded rice straw ultra-fine powder. The solid-to-liquid ratio of the steam-exploded straw ultra-fine powder to water is 10% (g / g); the reaction temperature starts to rise from room temperature at 29°C To 140°C; Reaction time: 5min; Heating time: 40min; Solid superacid S 2 o 8 2- / ZrO 2 -SiO 2 The mass ratio to the steam-exploded rice straw superfine powder is: 6% (g / g); the stirring speed is 200r / min. The yield of levulinic acid (based on the carbohydrate content in the substrate) was 20.0%.

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PUM

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Abstract

The invention belongs to the resource utilization field of crop straw wastes, aiming to adopt a solid super acidic catalyst to replace a liquid inorganic acid catalyst and convert solid straw fiber component to prepare an acetylpropionic acid compound. Moreover, the invention is helpful to solve the problems of pollution, corrosion, difficult operation and environmental pollution during preparing acetylpropionic acid through adopting liquid inorganic acid to carry out catalytic conversion of a fiber material in the prior production of acetylpropionic acid. The invention adopts solid super strong acid to convert solid straw, and has the advantages of no equipment corrosion, simple operation and no danger; according to the characteristics that straw structure is not uniform, the invention adopts a steam-explosion straw wet method to realize superfine grinding so as to obtain a fibrous structure rich in fibrous cells after separation; moreover, respectively taking original straw, steam-explosion straw, steam-explosion straw superfine powder and steam-explosion straw fibrous structure part as a raw material, the invention adopts the solid super strong acid as a catalyst to convert straw fiber component, thereby preparing an acetylpropionic acid compound. The invention solves the problems of pollution, corrosion, difficult operation and environmental pollution during preparing acetylpropionic acid through adopting liquid inorganic acid to carry out catalytic conversion of the fiber material.

Description

technical field [0001] The invention belongs to the fields of utilization of crop straw waste resources and preparation of platform compounds, and in particular relates to a method for preparing green platform compound levulinic acid based on straw biomass resources by converting straws with a clean solid superacid catalyst. Background technique [0002] Levulinic acid (Levulinic acid, CH 3 COCH 2 CH 2 COOH), is an important platform compound, its active groups are carboxyl and ketone groups, which can synthesize various chemicals through chemical reactions such as esterification, halogenation, hydrogenation, dehydrogenation, and condensation, such as: plastics Modifiers, organic synthesis intermediates, antioxidants, fuel additives, cosmetic additives, pharmaceuticals, chiral reagents, photodynamic drugs and agricultural chemicals, bioactive materials, polymers, lubricants, adsorbents, coatings, batteries, Ink, electronic products, etc., have a very wide range of applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/185C07C51/00
Inventor 陈洪章靳胜英
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI