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公开(公告)号：US20220064199A1
公开(公告)日：2022-03-03
申请号：US17411722
申请日：2021-08-25
发明人： Alok SATLEWAL , Ruchi AGRAWAL , Ravindra KUMAR , Ravi Prakash GUPTA , Suresh Kumar PURI , Deepak SAXENA , Sankara Sri Venkata RAMAKUMAR
摘要： An integrated approach for utilizing waste products of 2G bio-refineries to fractionate the lignin of high purity. The present invention also provides a method of recycling of two waste products (2-G ethanol residue as the substrate (LRBR) and fusel oil/synthetic fusel oil (SFO) as one of the solvent) of the biorefineries in a beneficial manner to fractionate the lignin of high purity. The present method of separating high purity lignin comprises fractioning extractive-free lignin rich residue with a solvent, wherein the solvent is a mixture of SFO/Fusel oil and Formic acid. An optimized ratio of waste fusel oil and formic acid gave more than >85% yields of high purity lignin.
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2.发明申请公开(公告)号：US20190248962A1
公开(公告)日：2019-08-15
申请号：US16271423
申请日：2019-02-08
发明人： Alok SATLEWAL , Ruchi AGRAWAL , Ravindra KUMAR , Anshu Shanker MATHUR , Ravi Prakash GUPTA , Biswajit BASU , Deepak Kumar TULI
摘要： The present invention relates to an additive or additive composition for improved production of fermentable sugars from lignocellulosic biomass during enzymatic hydrolysis. More particularly, the present invention discloses petrochemical waste as an additive or an additive composition containing one or more ethylene glycol oligomers and one or more metal ions which are useful for improved production of fermentable sugars from lignocellulosic biomass during enzymatic hydrolysis.
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公开(公告)号：US20240343884A1
公开(公告)日：2024-10-17
申请号：US18620971
申请日：2024-03-28
发明人： Alok SATLEWAL , Ruchi AGRAWAL , Prakram Singh CHAUHAN , Ravindra KUMAR , Ravi Prakash GUPTA , Sankara Sri Venkata RAMAKUMAR
CPC分类号： C08J11/16 , C07C51/44 , C07C51/47 , C07C51/48 , C07C59/185 , C08J11/105 , C12P7/22 , C12P2201/00
摘要： The present invention relates to a novel integrated process to extract and purify levulinic acid (LA) produced from the technical lignin waste (2-G residue) generated after second generation (2-G) ethanol production from biomass. In this process, liquid-liquid extraction was carried out using fusel oil as an organic extractant to yield a LA rich organic phase and an acidic aqueous phase (raffinate). In addition, selected amines improved the LA yields by acting synergistically. Further fractional distillation was carried out to purify LA. The acidic raffinate is recycled back to the reaction in multiple times, which reduce the use of additional catalyst and make the overall process cost effective. The process is very simple and suitable to remove any colour and humins (soluble tar), which would otherwise form a problem in subsequent process step, particularly in distillation. At optimized process conditions 95% LA is recovered with 98% purity.
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公开(公告)号：US20220290195A1
公开(公告)日：2022-09-15
申请号：US17691912
申请日：2022-03-10
发明人： Periyasamy SIVAGURUNATHAN , Alok SATLEWAL , Tirath RAJ , Ravindra KUMAR , Ravi Prakash GUPTA , Suresh Kumar PURI , Sankara Sri Venkata RAMAKUMAR
摘要： The present invention provides an improved process for high titer lactic acid production using simultaneous saccharification and co-fermentation process using acid treated lignocellulosic biomass. The process comprises of pretreating lignocellulosic biomass comprising C5 and C6 sugars with dilute acid and superheated steam at a temperature ranging from 150-210° C.; neutralizing the pretreated lignocellulosic biomass of step (i) with NaOH pellets; and adding cellulase enzyme in the range of 1.5 to 10 FPU/g, bacteria, nutrients and buffering agent to the neutralized slurry obtained in step (ii) for hydrolysis and co-fermentation of C5 and C6 sugars at a temperature ranging from 40-45° C. for a period of 120-144 hours to obtain lactic acid. The process of the present invention requires simple nutrients and results in high titer lactic acid production within shortest duration of time.
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公开(公告)号：US20200002778A1
公开(公告)日：2020-01-02
申请号：US16452243
申请日：2019-06-25
发明人： Ravindra KUMAR , Surbhi SEMWAL , Alok SATLEWAL , Ravi Prakash GUPTA , Suresh Kumar PURI , Sankara Sri Venkata RAMAKUMAR
摘要： An advantageous process for pre-treating lignocellulosic biomass to hydrolysable polysaccharide enriched biomass with reduced amount of inhibitors of catalysis comprising steps of: providing a feedstock comprising cellulosic biomass; chopping of cellulosic biomass to have a cellulosic biomass feed material of uniform size; feeding of uniform sized feed material to a horizontal counter current extraction unit; removing excess of water from the feed material obtained from the extraction unit; soaking the extruded feed material obtained from the extraction unit; optionally removing excess of water from the feed material obtained after acid soaking; steam pre-treating the feed material obtained after removing excess of water from the acid soaked feed material; neutralizing the slurry obtained from the steam pre-treating; and optionally saccharifying the neutralized slurry.
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公开(公告)号：US20230339838A1
公开(公告)日：2023-10-26
申请号：US18135054
申请日：2023-04-14
发明人： Alok SATLEWAL , Ruchi AGRAWAL , Ravindra KUMAR , Ravi Prakash GUPTA , Sankara Sri Venkata RAMAKUMAR
IPC分类号： C07C51/487
CPC分类号： C07C51/487
摘要： The present disclosure relates to a process for producing levulinic acid from the technical lignin. The technical lignin is rich in lignin and ash and do not have any other use and usually incinerated as a waste management strategy. During the incineration process, the cellulose also gets burnt and wasted. In the present disclosure, there is provided an economical and environmentally friendly process to produce levulinic acid from the technical lignin by using a synergistic combination of catalysts for high yields and high titer with acid recycling in a cost-effective manner
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公开(公告)号：US20190284545A1
公开(公告)日：2019-09-19
申请号：US16353533
申请日：2019-03-14
发明人： Alok SATLEWAL , Ruchi AGRAWAL , Ravindra KUMAR , Ravi Prakash GUPTA , Suresh Kumar PURI , Sankara Sri Venkata RAMAKUMAR
摘要： The present invention relates to a formulation to stabilize lignocellulolytic enzyme mixture. This invention in particular relates to a formulation composed of lignocellulolytic enzyme with critical dosages of molasses either with petrochemical waste or glycerol as an additive to improve enzyme stability in a synergistic manner.
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8.发明申请公开(公告)号：US20220003698A1
公开(公告)日：2022-01-06
申请号：US17364203
申请日：2021-06-30
发明人： Ravindra KUMAR , Sujit MONDAL , Christopher JAYARAJ , Gurpreet Singh KAPUR , Sankara Sri Venkata RAMAKUMAR
IPC分类号： G01N24/08
摘要： The present invention relates to a method based on proton NMR technique to differentiate genuine and spurious Hand-rub formulations. This method identifies and estimates all four components present in WHO-recommended Hand-rub formulations. Further, this method also identifies the presence of non-recommended/additional components present in WHO-recommended Hand-rub formulations. The method described in this invention utilizes experimental parameters and derived equations to quantify all four components in just fifteen minutes without using any organic solvents.
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