公开(公告)号：WO2011082469A8

公开(公告)日：2011-10-27

申请号：PCT/CA2010001963

申请日：2010-12-13

Applicant: CA NAT RESEARCH COUNCIL ,  KUMAR ASHWANI ,  SAIMANI SUNDAR ,  DAL-CLN MAURO MARIO

Inventor： KUMAR ASHWANI ,  SAIMANI SUNDAR ,  DAL-CLN MAURO MARIO

IPC: C08L79/08 ,  C08J3/24 ,  C08K5/3415

CPC classification number: C08G73/12 ,  B01D53/228 ,  B01D71/64 ,  C08G73/1039 ,  C08G73/1042 ,  C08G73/1046 ,  C08J3/246 ,  C08K5/3415 ,  C08L79/08 ,  C08L79/085 ,  C08L2205/02 ,  C10L3/104 ,  Y02P20/152 ,  C08L2666/20

Abstract: Commercially available linear thermoplastic polymers (for example polyetherimide), that are modified b\ cross-linked bismaleimide networks ha\ing cardo groups (for example bispheml fluorene groups), to produce semi-interpenetrating networks (semi-IPNs), for use in asymmetric membranes that ha\e excellent gas separation properties, particular!} for the separation of carbon dioxide from nitrogen

Abstract translation: 市售的线性热塑性聚合物（例如聚醚酰亚胺），其是具有卡片基团（例如双巯基芴基团）的改性双交联双马来酰亚胺网络，以产生半互穿网络（半IPN），用于不对称 具有优异的气体分离性能的膜，特别是用于二氧化碳与氮气的分离

公开(公告)号：CA2600808C

公开(公告)日：2013-07-16

申请号：CA2600808

申请日：2006-03-10

Applicant: CA NAT RESEARCH COUNCIL

Inventor： KUMAR ASHWANI ,  KURDI JAMAL

IPC: C08L79/08 ,  B01D53/22 ,  B01D71/40 ,  B01D71/64 ,  C08F283/04 ,  C08G73/12 ,  C08J5/22 ,  C08J5/24 ,  C08L39/04 ,  C08L81/06

Abstract: In order to synthesize semi-interpenetrating polymer networks (semi-IPNs) with molecular sieve characteristics, polyetherimide/bismaleimide (PEI/BMI) chromophore composites were made through sol-gel technique. A tunable and compatible chemical structure with fine morphology was obtained through in situ controlled sol-gel polymerization, crosslinking, chemical modification and membrane fabrication. The novel semi-IPN, synthesized and assembled by using ethanol as polar protic modifier and pore former, had a superior structure and morphology suitable for making gas separation membranes. These semi-IPN membranes gave fifteen times higher gas flux without significant decrease in their gas permselectivity than membranes prepared from pure PEL The chemical structures of these novel semi-IPNs were characterized by using FTIR, XPS and SEM. It was discovered for the first time that in situ simultaneous ethoxylation, anionic polymerization of BMI and imide modifications were responsible for creating the new chemical structure and molecular morphology that was different from traditional BMI resins. In addition to the superior structure, this chemical processes have the advantages of using simple green chemistry, ambient temperature and does not require initiators for polymerization.

公开(公告)号：CA2600808A1

公开(公告)日：2006-09-14

申请号：CA2600808

申请日：2006-03-10

Applicant: CA NAT RESEARCH COUNCIL

Inventor： KURDI JAMAL ,  KUMAR ASHWANI

IPC: C08L79/08 ,  B01D53/22 ,  B01D71/40 ,  B01D71/64 ,  C08F283/04 ,  C08G73/12 ,  C08J5/22 ,  C08J5/24 ,  C08L39/04 ,  C08L81/06

Abstract: In order to synthesize semi-interpenetrating polymer networks (semi-IPNs) with molecular sieve characteristics, polyetherimide/bismaleimide (PEI/BMI) chromophore composites were made through sol-gel technique. A tunable and compatible chemical structure with fine morphology was obtained through in situ controlled sol-gel polymerization, crosslinking, chemical modification and membrane fabrication. The novel semi-IPN, synthesized and assembled by using ethanol as polar protic modifier and pore former, had a superior structure and morphology suitable for making gas separation membranes. These semi-IPN membranes gave fifteen times higher gas flux without significant decrease in their gas permselectivity than membranes prepared from pure PEL The chemical structures of these novel semi-IPNs were characterized by using FTIR, XPS and SEM. It was discovered for the first time that in situ simultaneous ethoxylation, anionic polymerization of BMI and imide modifications were responsible for creating the new chemical structure and molecular morphology that was different from traditional BMI resins. In addition to the superior structure, this chemical processes have the advantages of using simple green chemistry, ambient temperature and does not require initiators for polymerization.

公开(公告)号：AU2605199A

公开(公告)日：2000-09-14

申请号：AU2605199

申请日：1999-02-26

Applicant: CA NAT RESEARCH COUNCIL

Inventor： KUTOWY OLEH ,  ZHANG SHI QIU ,  KUMAR ASHWANI

IPC: A23L27/30 ,  A23L1/22 ,  C07H15/24 ,  B01D61/14

Abstract: The invention disclosed relates to a process for the extraction of sweet compounds from Stevia rebaudiana Bertoni, by column extraction, followed by purification by filtration. The extraction is at temperatures in the range of 0 to 25 DEG C. Preferably, a pre-treatment step of microfiltration is used to clarify the extract. Purification is by ultrafiltration followed by nanofiltration. The filtration conditions are controlled to optimize the recovery of the sweet compounds.