influence of the amount of catalyst on … acid acetic acid is a commodity chemical that is used in...

INFLUENCE OF THE AMOUNT OF CATALYST ON ACETIC ACID FORMATION FROM BIRCH

WOOD IN BIOMASS PRETREATMENT PROCESS

M.sc., Prans Brazdausks [email protected]

Dr.hab.chem., Nikolais Vedernikovs

Dr.chem.ing., Maris Puke

M.sc., Irena Kruma

Interdisciplinary Research for Higher Socioeconomic Value of Forests International Scientific Conference, June 10-12, 2013, Riga, Latvia

Introduction

The growing demand for energy resources, reduction of fossil energy stocks and the need to take care of the quality of the environment are put forward sustainable principles of development as one of the main directions of the future development

Therefore, research, development and industrialisation of renewable energy are currently moving at a rapid pace worldwide

2 International Scientific Conference, June 10-12, 2013, Riga, Latvia

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Acetic Acid Acetic acid is a commodity chemical that is used in a variety of industrial processes, for example, in the vinyl acetate monomer, purified terephthalic acid, cellulose acetate production, and so on

In the last year, the global production amount of Acetic Acid is approximately 9,5 millions tons

The demand for Acetic Acid is increasing by approximately 3 to 4% per year

80% of produced amount of Acetic Acid obtained from petrochemical feedstock

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International Scientific Conference, June 10-12, 2013, Riga, Latvia

Why From Birch Wood? • Birch have high content of cellulose (~40%, o.d.w.) and

hemicelluloses (~25%, o.d.w.)

• Birch wood contains about 3-4% acetyl groups on a dry

mass basis

• Birch is the most widespread deciduous species in Latvia

• Birch wood is a potential raw material source, because it is

renewable

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Info from : http://www.vmd.gov.lv


Main Goal of Study

Develop wasteless technology for obtaining bioethanol and other valuable products from

birch wood

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Subgoal of Study

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Determine the influence of the amount of dilute sulfuric acid as catalyst on the formation of acetic acid dynamics and

its yields from birch wood in pretreatment process


Pretreatment of Lignocellulosic Biomass 7

Birch wood saw logs

Chipping

Birch wood chips

Transfer to LSIWC

•Dry to room moisture

•Sieve to a size between 10..20 mm

•Store in sealed plastic barrels

Preparation of raw material Add catalyst solution

Paddle mixer with

birch wood chips

Reactor of original

pilot plant

Loading

Lignocellulose Hydrolysis

Hydrolysate

Condensation

To GC


Component Yield basis on a

dry mass of wood Literature data

Extractives 4.0% 3.4 – 4.5%

Hemicelluloses 26.3% 26.5 – 28.7%

Cellulose 44.9% 35.4 – 43.9%

Lignin 23.8% 19.1 – 25.8%

Ashes 0.3% 0.2 – 0.3%

Acetyl groups 4.2% 3.9 – 4.3%

Theoretical furfural yield 14.7% 14.4 – 16.6%

Theoretical acetic acid yield 5.9% 5.4 – 6.0%

Chemical Composition Analysis of Birch Wood 8


Formation Dynamics of Acetic Acid From Birch Wood

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0,0

0,5

1,0

1,5

2,0

2,5

3,0

10 10 10 10 10 10 10 10 10

Am

ou

nt o

f a

ce

tic a

cid

, %

fro

m .

o.d

.w.

Time period, min

1,5%

2,0%

2,5%

3,0%

3,5%

4,0%


Influence of Catalyst Amount on Yield of Acetic Acid From Birch Wood

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Amount of catalyst,

% from o.d.w. 1.5 2.0 2.5 3.0 3.5 4.0

Time, min Yield of acetic acid, % from o.d.w.

10 2.04 2.21 2.17 2.28 2.56 2.77

20 3.29 3.52 3.44 3.61 3.90 4.17

30 3.94 4.44 4.37 4.55 4.69 4.80

40 4.38 4.94 4.78 4.94 5.00 5.12

50 4.67 5.19 5.10 5.27 5.23 5.31

60 4.86 5.34 5.30 5.50 5.41 5.48

70 5.01 5.45 5.46 5.64 5.53 5.60

80 5.13 5.53 5.58 5.73 5.64 5.71

90 5.22 5.58 5.65 5.80 5.73 5.79


Conclusions

1. Theoretical yield of acetic acid, which can be obtained from birch wood, is 5.94%, calculated on oven-dried wood.

2. Increasing the amount of catalyst by 0.5%, in the range from 1.5% to 4.0%, calculated on o.d.w., the total yield of acetic acid increased from 5.22% to 5.80%, what respectively from theoretically possible amount is 87.9% to 97.6% and can be considered as a very good result.

3. The highest yield of acetic acid of 5.8%, which is 97.8% from the theoretical yield, can be obtained at the amount of catalyst of 3.0% after 90 min from the beginning of pre-treatment process.

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Thank You for

Your Attention!

Acknowledgement

This work has been financed by European Regional Development Fund

contract No: 2010/0288/2DP/2.1.1.1.0/10/APIA/VIAA/038


influence of the amount of catalyst on … acid acetic acid is a commodity chemical that is used in...

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