Method for preparing attapulgite solid alkali for synthesizing biodiesel from waste oil and fat

A technology of attapulgite and synthetic biology, which is applied in the field of preparation of solid alkali catalysts, can solve problems such as easy saponification, complex process, and low quality of waste oil, and achieve the effects of increasing affinity, simple preparation process, and reducing poisoning

Inactive Publication Date: 2014-04-09
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many studies on the solid base used for biodiesel preparation, the publication number is CN101024189A "a magnetic solid base catalyst and its preparation method and application", and the application publication number is CN101811038A's patent "A Method and Application of Solid Gold Catalyst for Synthesizing Biodiesel" and the like have all studied the solid base used for biodiesel preparation, but there are many solid base catalysts used to catalyze the synthesis of biodiesel from waste oil The following defects: the quality of waste oil is low, often contains more fatty acids, it is easy to saponify during the transesterification process, a small amount of water is produced, and the solid alkali is easy to absorb H2O and CO2 "Poisoned" by acidic molecules
Therefore, solid base catalysts are mostly used in the preparation of biodiesel from oils with better catalytic quality, and acid catalysis or two-step acid-base catalysis are mostly used in the preparation of biodiesel from waste oils and fats, and the process is more complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: prepare attapulgite solid alkali according to the following steps

[0014] 1) Purification of attapulgite: Take 50g of attapulgite, add 400ml of deionized water, stir at 100r / min at room temperature for 24h, let it settle for 24h, pour off the bottom impurity and supernatant, then add 250ml of deionized water, Stir at 100r / min for 24 hours, then let stand for 24 hours, pour off the supernatant and lower impurities, filter with suction, dry at 105°C, pulverize, and pass through a 80-mesh sieve to obtain purified attapulgite;

[0015] 2) Acid-modified attapulgite: Take 40g of purified attapulgite, add 320ml of sulfuric acid solution with a concentration of 60% (v / v), stir at room temperature for 24h at a speed of 100r / min, filter with suction, and wash the filter cake with water Until the water is neutral, the filter cake is dried at 105°C, crushed, and passed through an 80-mesh sieve to obtain acid-modified attapulgite;

[0016] 3) Coupling agent modified ...

Embodiment 2

[0018] Example 2: Prepare attapulgite solid alkali according to the following steps

[0019] 1) Purification of attapulgite: Take 200g of attapulgite, add 1600ml of deionized water, stir at 100r / min at room temperature for 24h, let it settle for 24h, pour off the bottom impurity and supernatant, then add 1000ml of deionized water, Stir at 100r / min for 24 hours, then let stand for 24 hours, pour off the supernatant and lower impurities, filter with suction, dry the filter cake at 105°C, pulverize, and pass through a 80-mesh sieve to obtain purified attapulgite;

[0020] 2) Acid-modified attapulgite: Take 180g of purified attapulgite, add 1440ml of sulfuric acid solution with a concentration of 60% (v / v), stir at a speed of 100r / min for 24h at room temperature, filter with suction, and wash the filter cake with water Until the water is neutral, the filter cake is dried at 105°C, crushed, and passed through an 80-mesh sieve to obtain acid-modified attapulgite;

[0021] 3) Coupl...

Embodiment 3

[0023] Example 3: Prepare attapulgite solid alkali according to the following steps

[0024] 1) Purification of attapulgite: take 500g of attapulgite, add 4000ml of deionized water, stir at 100r / min at room temperature for 24h, let it settle for 24h, pour off the bottom impurity and supernatant, then add 2500ml of deionized water, Stir at 100r / min for 24 hours, then let stand for 24 hours, pour off the supernatant and lower impurities, filter with suction, dry the filter cake at 105°C, pulverize, and pass through a 80-mesh sieve to obtain purified attapulgite;

[0025]2) Acid-modified attapulgite: Take 450g of purified attapulgite, add 3600ml of sulfuric acid solution with a concentration of 60% (v / v), stir at a speed of 100r / min for 24h at room temperature, filter with suction, and wash the filter cake with water Until the water is neutral, the filter cake is dried at 105°C, crushed, and passed through an 80-mesh sieve to obtain acid-modified attapulgite;

[0026] 3) Coupl...

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PUM

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Abstract

The invention discloses a method for preparing attapulgite solid alkali for synthesizing biodiesel from waste oil and fat. The method for preparing the attapulgite solid alkali sequentially includes steps of purifying attapulgite; modifying the attapulgite by acid; modifying the attapulgite by coupling agents; and preparing the attapulgite solid alkali. Raw materials of the attapulgite solid alkali are low in cost, a preparation process is simple, the obtained attapulgite solid alkali is used for synthesizing the biodiesel from the waste oil and fat, a little amount of water generated in a reaction process can be effectively absorbed, the frequency of 'poisoning' of the solid alkali caused by acidic molecules such as CO2 is reduced, the service life of the solid alkali is prolonged, the solid alkali can be separated from a product easily, and higher than 80% of the activity of the solid alkali is kept after the solid alkali is reused by five times.

Description

technical field [0001] The invention relates to a preparation method of a solid base catalyst, in particular to a preparation method of an attapulgite solid base used for synthesizing biodiesel from waste oil. Background technique [0002] The transesterification method is currently the main method for producing biodiesel. The most common catalysts used are homogeneous acid and basic catalysts. There are catalysts that seriously corrode the equipment, cannot be reused, the product needs to be washed many times, and the process is relatively complicated. Disadvantages such as producing a large amount of waste liquid. The solid catalyst has the advantages of easy separation of the catalyst from the reaction system, easy regeneration of the catalyst after the reaction, and little corrosion of the catalyst to the reaction equipment. [0003] There have been many studies on the solid base used in the preparation of biodiesel. The publication number is CN101024189A "a magnetic so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/04C11C3/10C10L1/02
CPCY02E50/13Y02E50/10
Inventor 游庆红尹秀莲杨勇钱运华
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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