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Continuous preparation method of biodiesel

A biodiesel, animal and vegetable oil technology, applied in the fields of biofuel, petroleum industry, fatty acid esterification, etc., can solve the problems of unseen invention and application, reduce labor intensity, avoid serious equipment corrosion, and save costs.

Inactive Publication Date: 2012-12-12
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although there are many reports on the preparation of biodiesel with cation and anion exchange resins as catalysts, due to various technical and technological reasons, the technology of combining cation and anion exchange resins for esterification and continuous transesterification to prepare biodiesel has not yet been seen. invention and application

Method used

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  • Continuous preparation method of biodiesel

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The flow chart of the process used is attached figure 1 shown. First remove solid impurities and colloids in the raw food waste oil by plate and frame filtration at 50°C, then remove moisture from the raw material by vacuum distillation for 30 minutes, and store it in the raw material tank 1. Get 900 grams of catering garbage oil with a free fatty acid content of 10% through removal of impurities, add 100 grams of methanol therein, stir evenly, and preheat to 65 ° C; the reactant is added to the cation exchange resin (001 × 7) by a feed pump In the first fixed-bed reactor 3, the reactant temperature is kept at 65°C with a circulating water bath, and the space velocity of the reactor is adjusted to be 0.25h -1 , allowing the free fatty acid in the food waste oil to undergo esterification reaction with methanol to obtain fatty acid methyl ester and water. The product flowing out is collected in the separation tank 5 and left to stand for stratification. The upper layer...

Embodiment 2

[0036] The flow chart of the process used is attached figure 1 shown. Get 1200 grams of waste frying oil with a free fatty acid content of 50% through removal of impurities, add 600 grams of ethanol therein, stir evenly, and preheat to 78 ° C; the reactant is added to the cation exchange resin (NKC-9 ) in the first fixed-bed reactor 3, keep the reactant temperature at 78°C with a circulating water bath, and adjust the reactor space velocity to 0.1min -1 , let the free fatty acid in waste frying oil undergo esterification reaction with ethanol to obtain fatty acid ethyl ester and water. The product flowing out is collected in the separation tank 6 and left to stand for stratification. The upper layer of the separation tank 6 is a mixture of ethanol, unreacted free fatty acid and generated water, and ethanol and free fatty acid can be recovered after separation. The lower layer is a mixture of fatty acid glycerides and fatty acid ethyl esters, which is stored in the intermedi...

Embodiment 3

[0039] The flow chart of the process used is attached figure 1 shown. Get 1000 grams of acidified oil with a free fatty acid content of 90% after removal of impurities, add 500 grams of propanol therein, stir evenly, and preheat to 97 ° C; the reactant is added to the first stage of the cation exchange resin (D61) by a feed pump In a fixed bed reactor 3, a circulating water bath is used to keep the temperature of the reactants at 97°C, and the space velocity of the reactor is adjusted to be 0.08min -1 , let the free fatty acid in the acidified oil undergo esterification reaction with propanol to obtain fatty acid propyl ester and water. The product flowing out is collected in the separation tank 6 and left to stand for stratification. The upper layer in the separation tank 6 is a mixture of propanol, unreacted free fatty acid and generated water, and propanol and free fatty acid can be recovered after separation. The lower layer is a mixture of fatty acid glyceride and fatt...

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Abstract

The invention relates to a continuous preparation method of biodiesel, which uses waste animal and vegetable grease as the raw material and mainly comprises the following steps: (1) removing impurities and moisture in the raw material; (2) performing continuous esterification reaction in a cation exchange resin fixed bed reactor; (3) separating the esterification product; and (4) performing continuous ester exchange reaction and separation in an anion exchange resin fixed bed reactor. The invention overcomes the problems of severe equipment corrosion, difficult product separation, serious environmental pollution caused by waste acid liquid, failure to realize continuous preparation and the like in the homogeneous catalysis process, is low in cost, high in yield and friendly to environment, and has important market application prospects.

Description

technical field [0001] The invention belongs to the technical field of bioenergy, and relates to a method for preparing biodiesel, in particular to a continuous preparation method for preparing biodiesel from waste animal and vegetable oils. Background technique [0002] With the continuous aggravation of the energy crisis, the development of new energy has become the focus of research in various countries. Biodiesel, that is, free fatty acid mono-chain alkyl esters, has become an ideal substitute for petrochemical diesel due to its advantages of renewable, environmental friendliness, wide range of sources and low price. [0003] At present, the preparation methods of biodiesel are mainly divided into physical method and chemical method. Physical method includes direct mixing method and microemulsion method; chemical method includes high temperature thermal cracking method, esterification and transesterification method. Among them, the esterification and transesterification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/10C10L1/02
CPCY02E50/13Y02E50/10
Inventor 何本桥李建新任衍彪冯耀辉
Owner TIANJIN POLYTECHNIC UNIV
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