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A method for microalgae catalytic pyrolysis

A technology for catalytic pyrolysis and microalgae, which is used in the preparation of liquid hydrocarbon mixtures, special forms of dry distillation, petroleum industry, etc., can solve the problems of catalyst deactivation, inability to contact solid catalysts, and the liquid yield needs to be further improved. Liquid content, interaction-promoting effect

Active Publication Date: 2015-08-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although catalytic pyrolysis reduces the pyrolysis temperature and improves pyrolysis efficiency to a certain extent, microalgae exist in solid form for a long time during the pyrolysis process, so they cannot fully contact with the solid-state catalyst, and it is difficult to start to the catalytic effect, and the solid algae powder can easily block the active site of the catalyst, resulting in catalyst deactivation
Therefore, in order to enhance the fluidity of the reaction system and improve the efficiency of catalytic pyrolysis, Chinese patent CN101984025A mentioned a kind of organic solvent as auxiliary agent, and CO 2 As a filling gas, the system pressure is maintained at 2~4MPa, the temperature is raised to 300~450°C, and the reaction is carried out under the action of a Lewis acid catalyst for 20~60 minutes to perform catalytic pyrolysis on microalgae, but this method can obtain less liquid products. The liquid yield of microalgae needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Select a kind of chlorella vulgaris and culture it in a 20L tank for 15 days. At the later stage of microalgae culture, according to the established relationship between OD and cell dry weight, the concentration of microalgae is calculated to be 1.82g / L (dry weight meter);

[0024] (2) Use NaOH to adjust the pH of the microalgae culture solution to 12, let it stand for 30 minutes, and take the algae liquid from the bottom of the culture tank for centrifugation to obtain algae sludge state cell aggregates;

[0025] (3) Put the algae mud obtained in step (2) into an oven, dry at 90°C for 24 hours, and use a grinder to crush the dried microalgae into 500-mesh powder particles;

[0026] (4) Take 30 grams of microalgae powder treated in step (3), add 400 ml of methanol (methanol content is 99.5%) to it, stir and mix, and add 2 grams of activated aluminum oxide as a catalyst;

[0027] (5) Put the mixture in step (4) into the autoclave, replace the air repeatedly 5 ti...

Embodiment 2

[0031] (1) Select a botrytis (Botryococcus braunii) and culture it in a 20L tank for 20 days. At the later stage of microalgae culture, according to the established relationship between OD and cell dry weight, the concentration of microalgae is calculated to be 1.94g / L ( dry weight meter);

[0032] (2) Use NaOH to adjust the pH of the microalgae culture solution to 12, let it stand for 30 minutes, and take the algae liquid from the bottom of the culture tank for centrifugation to obtain algae sludge state cell aggregates;

[0033] (3) Put the algal slime cell aggregate obtained in step (2) into an oven, dry at 90°C for 24 hours, and use a grinder to crush the dried microalgae into 200-mesh powder particles;

[0034] (4) Take 25 grams of microalgae powder treated in step (3), add 1250 ml of n-hexanol (n-hexanol content is 99.5%) to it, stir and mix, and add 2.5 g of activated zeolite molecular sieve catalyst;

[0035] (5) Put the mixture in step (4) into the autoclave, replace...

Embodiment 3

[0038] (1) Select a diatom (Bacillariophyceae) and culture it in a 20L tank for 30 days. At the later stage of microalgae culture, according to the established relationship between OD and cell dry weight, the concentration of microalgae is calculated to be 2.56g / L (dry recalculated);

[0039] (2) Use NaOH to adjust the pH of the microalgae culture solution to 12, let it stand for 30 minutes, take the algae solution from the bottom of the culture tank for centrifugation, control the centrifugal speed at 5000rpm, and centrifuge for 5 minutes;

[0040] (3) Put the algal slime cell aggregate obtained in step (2) into an oven, dry at 90°C for 24 hours, and use a grinder to crush the dried microalgae into 300-mesh powder particles;

[0041] (4) Take 40 grams of microalgae powder treated in step (3), add 2800 ml of n-hexanol (n-hexanol content is 99.5%) to it, stir and mix, and add 1 g of aluminum chloride;

[0042] (5) Put the mixture in step (4) into the autoclave, replace the air...

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Abstract

The invention discloses a method for catalytic pyrolysis of microalgae, which comprises the following steps: well mixing algae powder particles, an organic solvent, and a catalyst in a reactor; heating to 70-100 DEG C at a pressure of 3-8 MPa, maintaining the temperature for 20-60 min, then continuing to heat to 230-500 DEG C, maintaining the temperature for 1-3 hours; after the reaction, performing separation to obtain the pyrolytic liquid product. The method of the invention divides the catalytic pyrolysis process into a low temperature and a high temperature heating phase. Through proper treatment of microalgae with the organic solvent, the liquid content of the catalytic pyrolysis product is improved; when compared with the prior art, the method of the invention increases the liquid yield from 29.2% to 35.3%.

Description

technical field [0001] The invention belongs to the field of biological energy, and mainly relates to a method for catalytic pyrolysis of microalgae. Background technique [0002] With the pressure of shortage of resources in human society and the increasingly serious environmental problems, the development of biodiesel and some fossil energy substitutes using microalgae has become a research hotspot. In terms of the utilization of microalgae, the current research is mostly on the extraction of oil from microalgae. The oil content in microalgae is relatively high, and its oil content generally accounts for 20% to 50% of the dry weight of cells. However, oil is the cell content, and its extraction process generally adopts organic phase extraction and other methods, which is not conducive to large-scale application. In addition, the microalgae cell body also contains a variety of long-chain organic compounds, so it can be considered to heat treat the microalgae to obtain usef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00C10B53/00
CPCY02E50/32Y02E50/30
Inventor 张霖师文静廖莎李晓姝王领民
Owner CHINA PETROLEUM & CHEM CORP