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A method for the catalytic synthesis of biodiesel by short mesoporous solid base molecular sieves

A synthetic biology, short mesoporous technology, applied in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of difficult separation of ionic liquids, large amount of ionic liquids, and difficult separation of products, and achieve low operating costs , short reaction time and less dosage

Active Publication Date: 2020-10-30
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ionic liquids have disadvantages such as large dosage, high cost, certain viscosity, and difficulty in separating from the product.
Kong Jie (Grain and Oil Processing, 2010, 3:31-33) used basic ionic liquid [Bmin]OH to catalyze the transesterification reaction of sunflower oil and methanol to prepare biodiesel, the product quality yield was high, but the ionic liquid was separated from the product difficulty
This prompts the study of immobilized ionic liquids with high activity and easy separation, in order to overcome the disadvantages of large amount of ionic liquids, high cost, certain viscosity, and difficult separation and recovery.

Method used

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  • A method for the catalytic synthesis of biodiesel by short mesoporous solid base molecular sieves
  • A method for the catalytic synthesis of biodiesel by short mesoporous solid base molecular sieves
  • A method for the catalytic synthesis of biodiesel by short mesoporous solid base molecular sieves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Short Mesoporous Solid Base Molecular Sieve [Smim]CO 3 - Preparation of Zr-SBA-15

[0041] 1) Mix methylimidazole, silane coupling agent 3-chloropropyltriethoxysilane (CPTES), and toluene at a mass ratio of 1:3.05:20 at 110°C, condense and reflux for 24 hours with N2 to achieve formazan Imidazole N-alkylation reaction, after steaming the organic solvent toluene under reduced pressure, a kind of organosilicon ionic liquid compound [Smim]Cl (1-propyl (triethoxysilyl)-3-methyl imidazolium chloride), the organic solvent toluene used should be dehydrated with anhydrous magnesium sulfate before use to avoid hydrolysis of silane coupling agent (3-chloropropyltriethoxysilane) in water, ethoxy Water breakage occurs.

[0042] 2) At 40 °C, the surfactant polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) was mixed with ZrOCl 2 ·8H 2 O was added to 1.6mol / L HCl solution and stirred until P123 was completely dissolved to form a mixed solution,...

Embodiment 2

[0048] Example 2 The operation steps are the same as in Example 1, but the basic substance K exchanged with [Smim]Cl / Zr-SBA-15 anion 2 CO 3 Change to CH 3 COOK, a Short Mesoporous Solid Base Molecular Sieve [Smim]CH 3 COO / Zr-SBA-15, whose basicity pKa is 7.2~9.8, is used to catalyze the synthesis of biodiesel, and the mass yield of biodiesel product is 23.4%.

Embodiment 3

[0049] Example 3 The operation steps are the same as in Example 1, but the basic substance K exchanged with [Smim]Cl / Zr-SBA-15 anion 2 CO 3 Change it to KOH to make a short mesoporous solid base molecular sieve [Smim]OH / Zr-SBA-15, whose basicity pKa is 7.2~15.0, which is used to catalyze the synthesis of biodiesel, and the mass yield of the biodiesel product is 94.6%.

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Abstract

The invention discloses a method for adopting a short-mesoporous solid-base molecular sieve for catalyzing synthesis to obtain biodiesel. According to the method, methylimidazole and a silane couplingagent are put into an organic solvent to achieve a methylimidazole-N-alkylation reaction to obtain organic silicone ionic liquid [Smim]Cl, then the liquid is grafted to a short-mesoporous Zr-SBA-15 molecular sieve carrier, and finally the carrier conducts anion exchange with an alkaline substance to prepare the novel short-mesoporous solid-base molecular sieve [Smim]X / SBA-15 catalyst used for catalyzing synthesis of grease and alcohol materials to obtain the biodiesel, wherein the reaction temperature is 65-85 DEG C, and the reaction time is 6-10 hours. The catalyst is high in reusability, byusing saturated salt water to carry out demulsification separation on coarse biodiesel products, the cost for refined manufacturing is low, the yield of the biodiesel reaches 97.6%, the material components can be recycled, and the process is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of fine chemical bioenergy, and relates to a method for synthesizing biodiesel by a novel short mesoporous molecular sieve immobilized alkaline ionic liquid catalyst [Smim]Y / Zr-SBA-15 by catalyzing the transesterification reaction of oil and methanol. Background technique [0002] As a clean and renewable energy, biodiesel has good combustion, environmental protection, less sulfur and nitrogen compound emissions, and is flexible and convenient to use. It is still a research hotspot, especially the utilization of waste oil has important social and environmental protection significance. Alkali catalysis is usually used to prepare biodiesel, such as KOH, NaOH, K2CO3, NaCO3, etc., but there are problems such as corrosion of equipment and the need for acid-base neutralization, homogeneous lye catalysis is easy to saponify and produce a large amount of waste water, causing secondary pollution to the environment. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C10L1/02C11C3/10
CPCB01J31/38C10L1/02C11C3/10Y02E50/10
Inventor 刘跃进王亮刘宁余琼李姗姗潘浪胜李勇飞骆战涛唐红娟
Owner XIANGTAN UNIV
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