Method for producing biogas through coupling biodiesel oil byproduct crude glycerine purification and pretreated agriculture and forestry residue fermentation

A technology for biodiesel and crude glycerol, which is applied in fermentation, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of production cost, low recovery rate and purity of glycerol, and inability to achieve high economic benefits for enterprises, and achieves low cost , Good economic and environmental benefits, and the effect of recyclability

Active Publication Date: 2018-10-12
汕头市利利新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The source of raw materials is complex, and its by-product crude glycerin generally has poor quality, low purity, many impurities, complicated processing, and production problems
It can be seen that the sim

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The crude glycerin comes from a biodiesel enterprise that uses waste oil to produce 10,000 tons of biodiesel per year, and the concentration of the crude glycerin is measured to be 45%.

[0022] Get this crude glycerol 500 grams, under the condition of stirring, add the mass fraction of the phosphoric acid that adds deployment and be 150 grams of phosphoric acid methanol solution of 3.5%, add 50 grams of pulverized agricultural and forestry residues, and stir to obtain crude glycerin liquid, crude The pH of the glycerin solution is 2, the agricultural and forestry residues are a mixture of peanut shells, straw and eucalyptus wood, the mass ratio of peanut shells, straw and eucalyptus wood is 1:1:1, the moisture content of agricultural and forestry residues is 7.5%, and the mesh size is 40 head.

[0023] Seal the uniformly stirred crude glycerol solution and place it in a constant temperature water bath at 55°C for 24 hours, press the crude glycerin solution with a small...

Embodiment 2

[0038] Get 800 grams of this crude glycerin, under the condition of stirring, add the mass fraction of the phosphoric acid that is deployed and be 160 grams of phosphoric acid methanol solution of 2.5%, add 80 grams of pulverized agricultural and forestry residues, and stir to obtain crude glycerin liquid, crude The pH of the glycerol solution is 2, the agricultural and forestry residue is a mixture of bagasse and corncob, the mass ratio of bagasse and corncob is 1:1, the moisture content of the agricultural and forestry residue is 7.5%, and the mesh size is 40 mesh.

[0039] Seal the uniformly stirred crude glycerol solution and place it in a constant temperature water bath at 55°C for 24 hours, press the crude glycerin solution with a small bag filter press until no liquid drips out, separate the solid phase and the liquid phase, and the solid phase is processed After processing agricultural and forestry residues, mix the processed agricultural and forestry residues into anae...

Embodiment 3

[0045] Get this crude glycerol 1200 grams, under the condition of stirring, add the mass fraction of the phosphoric acid that is deployed and be 480 grams of phosphoric acid methanol solution of 2.5%, add 60 grams of pulverized agricultural and forestry residues, and stir to obtain crude glycerin liquid, crude The pH of the glycerin solution is 2, the agricultural and forestry residues are a mixture of bagasse, corn cobs, and peanut shells, and their mass ratio is 2:1:2, the moisture content of the agricultural and forestry residues is 6%, and the mesh size is 40 mesh.

[0046] Seal the uniformly stirred crude glycerol solution and place it in a constant temperature water bath at 60°C for 24 hours, press the crude glycerin solution with a small bag filter press until no liquid drips out, separate the solid phase and liquid phase, and the solid phase is processed After processing agricultural and forestry residues, mix the processed agricultural and forestry residues into anaero...

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Abstract

The invention provides a method for producing biogas through coupling biodiesel oil byproduct crude glycerine purification and pretreated agriculture and forestry residue fermentation. The method comprises the following steps: adding a methanol solution of phosphoric acid into biodiesel oil byproduct crude glycerine, meanwhile, adding agriculture and forestry residues, carrying out uniform stirring so as to obtain a crude glycerine solution, subjecting the crude glycerine solution to standing, carrying out filter pressing so as to separate out a solid phase, i.e., treated agriculture and forestry residues and a liquid phase, subjecting the treated agriculture and forestry residues to anaerobic fermentation to produce the biogas, subjecting the liquid phase to standing layering so as to obtain an upper layer, i.e., a methanol phase and a lower layer, i.e., a glycerine phase, recycling methanol, neutralizing glycerine until the glycerine is neutral, adsorbing the neutral glycerine solution with activated charcoal, then, filtering the glycerine solution, and subjecting the filtered filter liquor to ion exchange and concentration, thereby obtaining purified glycerine. According to themethod, biodiesel oil crude glycerine purification and agriculture and forestry residue pretreatment are treated in a cooperated manner, available ingredients are effectively recovered from the biodiesel oil byproduct crude glycerine, and thus, the recoverable utilization of resources is achieved, so that the method has good economic and environmental benefits.

Description

Technical field: [0001] The invention belongs to the technical field of biomass purification and pretreatment methods, and in particular relates to a method for biodiesel by-product crude glycerol purification coupled with pretreatment for fermentation of agricultural and forestry residues to produce biogas. Background technique: [0002] Glycerin is widely used in medicine, food and tobacco because of its high viscosity, strong hygroscopicity, high boiling point, water solubility, non-toxicity, low freezing point, good water holding capacity, easy decomposition by microorganisms, and three hydroxyl groups that can be made into some derivatives. It is an important light chemical raw material for more than 1,700 products in industries such as cosmetics, ink, national defense, leather, printing and dyeing, paint, synthetic resin, pesticide, toothpaste, and microbial fermentation. [0003] In my country, almost all high-purity medical glycerin (more than 99.5%) relies on import...

Claims

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Application Information

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IPC IPC(8): C07C29/74C07C29/76C07C29/86C07C29/80C07C31/22C12P5/02
CPCC07C29/74C07C29/76C07C29/80C07C29/86C12P5/023C07C31/225Y02E50/30
Inventor 李惠文苗长林李志兵杨玲梅罗文王治元付俊鹰吕鹏梅
Owner 汕头市利利新能源科技有限公司
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