scholarly journals Bioconversion of wood waste to bio-ethylene: A review

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4411-4437
Author(s):  
Carolina Mónica Mendieta ◽  
Rocío Elizabet Cardozo ◽  
Fernando Esteban Felissia ◽  
Nicolás Martín Clauser ◽  
María Evangelina Vallejos ◽  
...  
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Raw Material ◽  
Manufacturing Processes ◽  
Ethanol Dehydration ◽  
Industrial Plants ◽  
Environmental Considerations ◽  
Ethanol Recovery ◽  
Ethanol Ethanol ◽  
Hydrolysis Of

Bio-based ethylene produced by bioethanol dehydration is an environmentally friendly substitute for oil-based ethylene. It is a low-pollution raw material that can be used to produce high-value bio-based materials. Currently, some industrial plants use first-generation (1G) bioethanol to produce bio-ethylene. However, second-generation (2G) bioethanol is not currently used to produce bio-ethylene because the manufacturing processes are not optimized. The conversion of lignocellulosic biomass to bio-ethylene involves pretreatment, enzymatic hydrolysis of carbohydrates, the fermentation of sugars to ethanol, ethanol recovery by distillation, and ethanol dehydration to ethylene. This work presents a review of second-generation (2G) bio-ethylene production, analyzing the stages of the process, possible derivatives, uses, and applications. This review also contains technical, economic, and environmental considerations in the possible installation of a biorefinery in the northeast region of Argentina (NEA).

scholarly journals Second Generation Biobutanol: An Update

REAKTOR ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 101-110
Author(s):  
Dian Burhani ◽  
Eka Triwahyuni ◽  
Ruby Setiawan
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Cost Effective ◽  
Production Method ◽  
Raw Material ◽  
Food Crops ◽  
Butanol Production ◽  
Clostridium Species ◽  
Food Scarcity ◽  
Absolute Requirement

Butanol, a rising star in biofuel, can be produced by two approaches, petrochemically and biologically. Currently, the most promising route for butanol production is by fermentation using Clostridium species through an anaerobic condition. However, similar to other biofuels, feedstock has greatly influenced the production of biobutanol and the search for inexpensive and abundant raw material is an absolute requirement for a cost-effective process. Second-generation biobutanol which is produced from lignocellulosic biomass of agricultural and forestry waste not only meets the requirement but also alleviates competition with food crops and thereby solves the problems of food scarcity from the first generation biobutanol. This paper delivered the latest and update information regarding biobutanol production specifically second-generation biobutanol in terms of production method, recovery, purification, status, and technoeconomic.  Keyword: biobutanol, lignocellulose, purification, recovery, technoeconomic

scholarly journals BIOETHANOL PRODUCTION FROM COCONUT HUSK USING THE WET GAMMA IRADIATION METHOD

2021 ◽  
Vol 14 (2) ◽  
pp. 43
Author(s):  
Putra Oktavianto ◽  
Risdiyana Setiawan ◽  
Ilhami Ariyanti ◽  
Muhammad Fadhil Jamil
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Cellulose Hydrolysis ◽  
Raw Material ◽  
Bioethanol Production ◽  
Coconut Husk ◽  
Hydrolysis Process ◽  
Hydrolysis Of Cellulose ◽  
Ethanol Ethanol ◽  
Hydrolysis Of ◽  
Low Dosage

BIOETHANOL PRODUCTION FROM COCONUT HUSK USING the WET GAMMA IRRADIATION METHOD. The use of coconut husk has only been used as a material for making handicrafts such as ropes, brooms, mats, and others or just burned. The combustion of coconut husk can cause air pollution. In fact, coconut husk can be used as a raw material for bioethanol production so that the beneficial value of coconut husk will also increase. One way of bioethanol production from coconut husk is by irradiating the coconut husk. The coconut husk irradiation technique to be carried out in this study is the wet irradiation technique. Wet irradiation is carried out to accelerate the process of bioethanol production because at the time of irradiation, cellulose has been hydrolyzed and glucose has been formed so that it is more efficient in time and use of the material so that the cellulose hydrolysis process is not necessary. The coconut husk samples were wet because they were mixed with 4% NaOH and were irradiated using a gamma irradiator from STTN-BATAN Yogyakarta with a dose of 30 kGy and 50 kGy and 0 kGy (or without irradiation). Then the sample is fermented with the fungus Saccharomyces Cerevisiae from tape yeast to form ethanol. Ethanol is purified and then analyzed for concentrations using pycnometric and refractometric methods. The result is that the highest ethanol content is without irradiation (0 kGy), this is due to the low dosage used. However, the main point in this wet method research is evidence of hydrolysis of cellulose by the formation of gluoxane after irradiated wet coconut husk, and with Fehling A and B analysis, brown deposits are seen proving that glucose has been formed.

scholarly journals Integration of First- and Second-generation Bioethanol Production from Beet molasses and Distillery Stillage After Dilute Sulfuric Acid Pretreatment

2021 ◽  
Author(s):  
D. Mikulski ◽  
G. Kłosowski
Keyword(s):  
Ethanol Production ◽  
First Generation ◽  
Second Generation ◽  
Raw Material ◽  
Dilute Acid Pretreatment ◽  
Acid Pretreatment ◽  
Fourfold Increase ◽  
Beet Molasses ◽  
Dilute Sulfuric Acid Pretreatment ◽  
By Products

AbstractThe possibility of using waste distillery stillage (first-generation technology) after dilute acid pretreatment, as a medium for the preparation of beet molasses mash, for ethanol production according to the simultaneous saccharification and fermentation (SSF) technology, was assessed. The combination of lignocellulosic hydrolysates made from acid-pretreated stillage with sugar-rich beet molasses is an effective way of utilizing the first-generation ethanol production by-products in the second-generation ethanol production technology. It was demonstrated that the final ethanol concentration could be as high as 90 g/L. The process yield was over 94% of the theoretical yield when the molasses was diluted using acid-pretreated maize distillery stillage. An attempt to increase the pool of fermentable sugars by using cellulases to hydrolyze cellulose failed due to product inhibition in the fermentation medium with a high glucose concentration. A more than threefold increase in the concentration of ethyl acetate (even up to 924.4±11.8 mg/L) was observed in the distillates obtained from the media incubated with cellulases. The use of beet molasses combined with the hydrolysate of pretreated distillery stillage also changed the concentration of other volatile by-products. An increase in the concentration of aldehydes (mainly acetaldehyde to a concentration of above 1500 mg/L), methanol, 1-propanol, and 1-butanol was observed, while the concentration of higher alcohols (isobutanol, 2-methyl-1-butanol, 3-methyl-1-butanol) decreased. Interestingly, the use of cellulases in fermentation media from molasses and stillage hydrolysates resulted in an average fourfold increase in the concentration of this ester to a maximum level of 924.4±11.8 mg/L. Hydrolysates made from acid-pretreated distillery stillage, combined with sugar-rich beet molasses to boost the efficiency of the conversion process, can be successfully used in the production of second-generation fuel ethanol. However, further optimization of the cellulose enzymatic hydrolysis process is required for efficient use of the raw material.

scholarly journals Development opportunities of biomass-based ethanol production in relation to starch- and cellulosebased bioethanol production

2013 ◽  
pp. 71-75
Author(s):  
Zoltán Balla
Keyword(s):  
Ethanol Production ◽  
Life Cycle Analysis ◽  
Liquid Fuel ◽  
First Generation ◽  
Second Generation ◽  
Point Of View ◽  
Raw Material ◽  
Bioethanol Production ◽  
Fuel Production ◽  
Second Generation Bioethanol

The biomass is such a row material that is available in large quantities and it can be utilizied by the biotechnology in the future. Nowadays the technology which can process ligno cellulose and break down into fermentable sugars is being researched. One possible field of use of biomass is the liquid fuel production such as ethanol production. Based on the literary life cycle analysis, I compared the starch-based (first generation) to cellulose-based (second generation) bioethanol production in my study considering into account various environmental factors (land use, raw material production, energy balance). After my examination I came to the conclusion that the use of bioethanol, independent of its production technology, is favorable from environmental point of view but the application of second generation bioethanol has greater environmentally benefits.

scholarly journals Content of essential elements in fig fruits of foreign selection cultivars

2019 ◽  
pp. 50-58
Author(s):  
E. V. Dunaevskaya ◽  
E. L. Shishkina
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Essential Elements ◽  
Raw Material ◽  
Early Maturity ◽  
Two Generations ◽  
Health Products ◽  
Emission Mode ◽  
First Time ◽  
Absorption Mode

Objective. Fruits of figs from the collection of the Nikitsky Botanical Gardens: Figue Grise, Randino and Fig Blanche were studied for use as raw material for health products. Methods. The content of elements was determined using AAS “Kvant 2MT” in the emission mode (K) and in the absorption mode (Ca, Mg, Fe, Mn, Cu, Zn). Results. The content of seven essential elements in the fruits of two generations (yields) was studied for the first time. It was revealed that the fruits of the studied fig cultivars contain high quantities of potassium, calcium and magnesium, and satisfactory quantity of ferrum. In the first generation of fruits, the ferrum content is higher by 72-73%, potassium by 4.5-18.4%, than in the second generation of fruits. The fruits of the second generation accumulate more calcium (by 28-31%), magnesium (by 11.6-26.8%), zinc (by 9.9-23.3%) and manganese (by 5.2-17.7 %). Conclusion. The cultivar of early maturity Fig Blanche, in which the fruits of two generations are characterized by the maximum of three cultivars of potassium (15970 mg / kg in the I-st generation, 13020 mg / kg - in the II-nd generation), magnesium (2520 mg / kg and 2810 mg / kg), ferrum (15.54 mg / kg and 9.05 mg / kg), zinc (1.51 mg / kg and 1.69 mg / kg), cuprum (2.24 mg / kg and 1.93 mg / kg) and manganese (2.38 mg / kg and 2.51 mg / kg) content.

scholarly journals Efek Pretreatment Microwave-NaOH Pada Tepung Gedebog Pisang Kepok terhadap Yield Selulosa

2018 ◽  
Vol 38 (2) ◽  
pp. 133
Author(s):  
Dewi Maya Maharani ◽  
Khulafaur Rosyidin
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Carbon Sources ◽  
Time Variable ◽  
Raw Material ◽  
Cellulose Content ◽  
Bioethanol Production ◽  
The Third ◽  
Pretreatment Time ◽  
Solvent Volume

Carbon sources in the form of sugar to be converted into bioethanol are rapidly developed, they are so called as the first generation, the second generation, and the third generation. The petiole of banana is the second generation of lignocellulose which is a waste and potential in Indonesia to be used as the raw material of bioethanol production. This study aimed to determine the effect of the microwave to the content of petiole`s flour of “gepok” varieties and to know the effect of pretreatment time as well as the ratio of petiole mass to the resulted flour with the solvent of NaOH for bioethanol production. The 20 g of petiole with the size of 60 mesh was dissolved into NaOH 0.5 M with the variation of solvent volume 150 mL, 200 mL and 250 mL then was pretreated with microwave as long as 20, 30, and 40 minutes. Annova resulted that time variable affected the cellulose content however the volume didn`t. Cellulose is a compound which is going to be converted into glucose. Hence, in this study, the lowest decrease of cellulose 350,20 mg/g was chosen from the microwave pretreatment with a yield of 93,10% at 20 g: 250 mL for 30 minutes.  ABSTRAKSumber karbon dalam gula untuk dikonversi menjadi bioetanol banyak mengalami perkembangan, mulai dari sumber bioetanol generasi satu, generasi dua dan generasi tiga. Gedebog pisang merupakan salah satu limbah berlignoselulosa generasi dua yang potensial di Indonesia dan memiliki kandungan selulosa tinggi yang dapat dimanfaatkan sebagai bahan baku produksi bioetanol. Penelitian ini bertujuan untuk mengetahui pengaruh gelombang microwave terhadap kandungan selulosa tepung (gedebog) pisang kepok dan mengetahui pengaruh lama pretreatment serta perbandingan massa bahan dengan volume pelarut NaOH terhadap kandungan selulosa tepung (gedebog) pisang kepok pada proses pretreatment yang dimanfaatkan untuk produksi bioetanol. Gedebog pisang ukuran 60 mesh sebanyak 20 g dilarutkan pada larutan NaOH 0,5 M dengan variasi volume pelarut 150 mL, 200 mL, dan 250 mL, selanjutnya diberi perlakuan (pretreatment) gelombang microwave dengan variasi waktu 20, 30 dan 40 menit. Pada hasil uji lanjut Annova menyatakan bahwa variabel waktu memberikan pengaruh nyata terhadap kandungan selulosa sedangkan interaksi antara variabel dan volume tidak memberikan pengaruh nyata terhadap kandungan selulosa. Selulosa merupakan senyawa yang akan dikonversi lebih lanjut menjadi glukosa. Sehingga pada penelitian ini memilih penurunan selulosa terendah yaitu menjadi 350,20 mg/g akibat pretreatment microwave-NaOH dengan rendemen 93,10% pada perlakuan massa bahan dengan volume pelarut 20 g:250 mL dengan waktu 30 menit.

Do remittances differ depending on migration pathway and length of stay?

2016 ◽  
Vol 1 (1) ◽  
pp. 105-118
Author(s):  
Anita Pugliese ◽  
Julie Ray ◽  
Neli Esipova
Keyword(s):  
Length Of Stay ◽  
First Generation ◽  
Second Generation ◽  
Global Analysis ◽  
Large Sample ◽  
Migration Pathway ◽  
First Generation Migrants ◽  
Second Generation Migrants

This paper reports the results from Gallup’s global analysis of the likelihood of first-generation migrants, second-generation migrants and the native-born to send financial help in the form of money or goods to others inside or outside their respective country of residence. The findings in this paper are based on more than 450,000 interviews conducted through Gallup’s World Poll in 157 countries in 2012, 2013 and 2014. The sample includes more than 26,000 first-generation migrants and more than 20,000 second-generation migrants. The large sample enables Gallup to analyze first-generation migrants by the duration of their stay in their adopted country and compare their remittance behaviors with second-generation migrants and the native-born.

Marcuse and Habermas's Political Ideas in English

2019 ◽  
pp. 215
Author(s):  
Asaad Abdullwahab AbdulKarim ◽  
Waleed Massaher Hamad ◽  
Salah Ibrahim Hamadi
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Frankfurt School ◽  
Western Thought ◽  
Political Ideas ◽  
Important Impact

Abstract     The Frankfurt School is characterized by its critical nature and it is the result of the Marxist socialist thought as it contributed to the development of the German thought in particular and the Western thought in general through important ideas put forward by a number of pioneers in the various generations of the school and most notably through the leading pioneer in the first generation, Marcuse, and the leading pioneer of the second  generation, Habermas, whose political ideas had an important impact on global thinking and later became the basis of the attic of many critical ideas. In spite of the belief of the school members in the idea of the criticism of power and community, each had his own ideas that distinguish him from the others.

Pharmakotherapie update

2020 ◽  
Vol 25 (1) ◽  
pp. 23-32
Author(s):  
Gerd Laux
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Therapeutische Maßnahmen ◽  
Second Generation Antipsychotics

Für die Therapie schizophrener Erkrankungen sind seit fast 60 Jahren Antipsychotika/Neuroleptika aufgrund ihrer antipsychotischen Wirkung von zentraler Bedeutung. Die Einteilung kann unter verschiedenen Gesichtspunkten erfolgen (chemische Struktur, neuroleptische Potenz, Rezeptorprofil), heute werden üblicherweise unterschieden typische (traditionelle, klassische, konventionelle) Antipsychotika der ersten Generation ‒ »First Generation Antipsychotics« (FGA) ‒ und sog. atypische (»neuere«) Neuroleptika bzw. Antipsychotika der zweiten Generation ‒»Second Generation Antipsychotics« (SGA). Hierzu zählen Aripiprazol, Asenapin, Cariprazin, Clozapin, Olanzapin, Quetiapin, Risperidon, Sertindol und Ziprasidon. Hierbei handelt es sich um keine homogene Gruppe – sowohl neuropharmakologisch (Wirkmechanismus), als auch hinsichtlich klinischem Wirkprofil und dem Nebenwirkungsspektrum bestehen z. T. erhebliche Unterschiede. Neben der Akut-Medikation ist eine Langzeitmedikation bzw. Rezidivprophylaxe mit Antipsychotika für die Rehabilitation vieler schizophrener Patienten im Sinne eines »Stresspuffers« von grundlegender Bedeutung. In Placebo-kontrollierten Studien trat bei Patienten, die über ein Jahr behandelt wurden, bei etwa 30% unter Neuroleptika ein Rezidiv auf, unter Placebo bei mehr als 70%. Für die Langzeitbehandlung bietet sich der Einsatz von Depot-Neuroleptika an, neu entwickelt wurden Langzeit-Depot-Injektionen mit Intervallen von bis zu 3 Monaten. Grundsätzlich ist die niedrigstmögliche (wirksame) Dosis zu verwenden. Im Zentrum der Nebenwirkungen (UAW) standen lange Zeit extrapyramidal-motorische Bewegungsstörungen (EPMS), mit der Einführung von Clozapin und anderen atypischen Antipsychotika der zweiten Generation gewannen andere Nebenwirkungen an Bedeutung. Hierzu zählen Gewichtszunahme, Störungen metabolischer Parameter und ein erhöhtes Risiko für Mortalität und zerebrovaskuläre Ereignisse bei älteren Patienten mit Demenz. Entsprechende Kontrolluntersuchungen sind erforderlich, für Clozapin gibt es aufgrund seines Agranulozytose-Risikos Sonderbestimmungen. Immer sollte ein Gesamtbehandlungsplan orientiert an der neuen S3-Praxisleitlinie Schizophrenie der DGPPN aufgestellt werden, der psychologische und milieu-/sozial-therapeutische Maßnahmen einschließt. Standard ist heute auch eine sog. Psychoedukation, für Psychopharmaka liegen bewährte Patienten-Ratgeber vor.

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