The Effects of Wood Storage on the Chemical Composition and Indigenous Microflora of Eucalyptus species Used in the Pulping Industry

Ramnath, Lucretia; Sitholé, Bruce; Govinden, Roshini

doi:10.15376/biores.13.1.86-103

Cited by 7 publications

(6 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the results found for A. mearnsii are slightly higher than that found for eucalyptus wood, it should be considered that the storage time, genetic improvement, geographical and climatic conditions have a direct influence on the extract concentration. 16,28 In a study carried out for eucalyptus, the authors showed that the storage time of 180 days can reduce up to 70% of lipophilic extracts due to biological decomposition and exposure to weathering. 13 In this context, we considered that the A. mearnsii lipophilic extracts were analyzed from the fresh material without remaining in stock.…”

Section: Resultsmentioning

confidence: 99%

Characterizing the Chemical Composition of Lipophilic Extracts from Acacia mearnsii Wood

Oliveira¹,

Grasel²,

Pinho³

et al. 2020

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

The chemical composition of Acacia mearnsii wood extract is described in this paper for the first time. This wood is cultivated in Brazil and has been used to complement the demand for hardwood in the pulp industry. In this study, we performed extractions with acetone (total extracts) and dichloromethane (lipophilic extracts responsible for the pitch formation), with the obtained percentages being 1.68 and 0.68%, respectively. The lipophilic extracts were derivatized and analyzed by Fourier transform infrared spectroscopy (FTIR) and gas chromatographymass spectrometry (GC-MS) before and after alkaline hydrolysis. The results showed that 57 compounds were detected in the lipophilic extracts and these are mainly constituted by fatty acids ca. 32.8 mg kg-1 and sterols 26.9 mg kg-1. These chemical classes have always been present in pitch deposits in the pulp industry. Therefore, these results may be used by pulp mills to establish strategies for pitch control and represent an important advance in the knowledge of A. mearnsii.

show abstract

Section: Resultsmentioning

confidence: 99%

Characterizing the Chemical Composition of Lipophilic Extracts from Acacia mearnsii Wood

Oliveira¹,

Grasel²,

Pinho³

et al. 2020

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…They showed that storing the chips at − 20 °C had similar effects on the decrease of lipophilic wood extractives than seasoning does. During six months of storage, 25-44% reduction of lipophilic extractives was observed [118].…”

Section: Wood Storage and Biological Treatmentmentioning

confidence: 99%

“…Otherwise, chip deterioration and wood decay due to sap stain and a fungal attack occur [104]. Ramnath et al [118] even found variations in bacterial and fungal communities on frozen stored wood chips. They showed that storing the chips at − 20 °C had similar effects on the decrease of lipophilic wood extractives than seasoning does.…”

Section: Wood Storage and Biological Treatmentmentioning

confidence: 99%

Removal of wood extractives as pulp (pre-)treatment: a technological review

2021

View full text Add to dashboard Cite

Wood extractives usually do not exceed five percent of dry wood mass but can be a serious issue for pulping as well as for the pulp itself. They cause contamination and damages to process equipment and negatively influence pulp quality. This paper addresses not only the extractives-related problems but also different solutions for these issues. It is an extensive review of different technologies for removing wood extractives, starting with methods prior to pulping. Several wood yard operations like debarking, knot separation, and wood seasoning are known to significantly decreasing the amount of wood extractives. Biological treatment has also been proven as a feasible method for reducing the extractives content before pulping, but quite hard to handle. During pulping, the extractives reduction efficiency depends on the pulping method. Mechanical pulping removes the accessory compounds of wood just slightly, but chemical pulping, on the other hand, removes them to a large extent. Organosolv pulping even allows almost complete removal of wood extractives. The residual extractives content can be significantly reduced by pulp bleaching. Nevertheless, different extraction-based methods have been developed for removing wood extractives before pulping or bleaching. They range from organic-solvent-based extractions to novel processes like supercritical fluid extractions, ionic liquids extractions, microwave technology, and ultrasonic-assisted extraction. Although these methods deliver promising results and allow utilization of wood extractives in most cases, they suffer from many drawbacks towards an economically viable industrial-scale design, concluding that further research has to be done on these topics. Graphical abstract

show abstract

“…During the wood storage, the extractives degraded, which resulted in changes in percentages, especially at the beginning of storage. A decrease in extractives the storage was observed by the authors Ramnath et al [32], Günther et al [33], and Giesel et al [34] as well.…”

Section: Resultsmentioning

confidence: 63%

Dry-Matter Loss and Changes in the Chemical Composition of Spruce Wood after Long-Term Storing in the Form of Roundwood

2022

View full text Add to dashboard Cite

Wood stock in a warehouse is a necessary precondition for reliable manufacturing. However, wood can degrade and lose the matter during storage. “Dry-matter loss (DML)” is used to quantify the degradation following the changes in weight of a wood substance. The proposed calculation of DML is based on using parallel figures. The calculated loss of spruce wood substance harvested in winter during a six-month period was 4.5%. The estimated annual loss of wood substance was 5.7%. The loss was caused by a factor with a gradually eliminated effect. The changes in the chemical composition of wood substance were not proportional to the original amount of the isolated chemical substances. Hemicelluloses and lignin suffered from the loss faster than there was a change in the DML of spruce wood. Hemicelluloses were the most unstable isolated compound, with an increased rate of change during the first four months. The number of extractive substances significantly decreased during two months of storage. However, there was an increase in the number of extractive substances after six months of storage. The loss of cellulose was similar to the DML of spruce wood during the whole time of storage. The FTIR analysis confirmed a decrease in the total crystalline index (TCI) and lateral order index (LOI) of cellulose due to the storage of roundwood.

show abstract

The Effects of Wood Storage on the Chemical Composition and Indigenous Microflora of Eucalyptus species Used in the Pulping Industry

Cited by 7 publications

References 39 publications

Characterizing the Chemical Composition of Lipophilic Extracts from Acacia mearnsii Wood

Characterizing the Chemical Composition of Lipophilic Extracts from Acacia mearnsii Wood

Removal of wood extractives as pulp (pre-)treatment: a technological review

Dry-Matter Loss and Changes in the Chemical Composition of Spruce Wood after Long-Term Storing in the Form of Roundwood

Contact Info

Product

Resources

About