Abstract:
This document describes polypeptides with dual CoA transferase and β-ketothioiase activities and variants thereof, use of such polypeptides in biosynthetic methods, and non-naturally occurring hosts comprising such polypeptides.
Abstract:
Processes for forming synthetic fibers from polymer melts containing a first fiber forming polymer, a spin assist additive, and optionally a pigment additive are provided. Also provided are synthetic fibers of a first fiber forming polymer, a spin assist additive, and optionally a pigment additive, as well as articles of manufacture such as yarns, carpets and fabrics made up of these synthetic fibers.
Abstract:
Systems and processes are described herein for drying polyamide pellets. The system can include a spin dryer that removes a majority of surface water from wet polyamide pellets to generate partially dried pellets. The system can also include a fluid bed dryer that dries and transports the partially dried pellets from the spin dryer to produce dried polyamide pellets.
Abstract:
The present disclosure relates to systems and methods for recovering water from a condensation reaction of at least one carboxylic acid and at least one diamine to make polyamide. The method can include obtaining, from an evaporator, an aqueous mixture comprising a partially polymerized polyamide and at least one of a carboxylic acid and diamine; passing the aqueous mixture through a tubular reactor comprising subjecting the aqueous mixture to a temperature and pressure sufficient to further polymerize the partially polymerized polyamide by condensation of the carboxylic acid and diamine, thereby producing water having a substantially gaseous phase; passing the water having a substantially gaseous phase into a rectification column thereby removing one or more of a diamine, a carboxylic acid and polyamide to provide purified water having a substantially gaseous phase; and condensing the purified water having a substantially gaseous phase into purified water having a substantially liquid phase. The system can include, among other things, a tubular reactor, a rectification column, a condensation assembly, and a conduit network.
Abstract:
This document describes biochemical pathways for producing pimelic acid, 7-aminoheptanoic acid, 7-hydroxyheptanoic acid, heptamethylenediamine or 1,7-heptanediol by forming two terminal functional groups, comprised of carboxyl, amine or hydroxyl group, in a C7 aliphatic backbone substrate. These pathways, metabolic engineering and cultivation strategies described herein rely on enzymes or homologs accepting methyl ester shielded dicarboxylic acid substrates.
Abstract:
This document describes biochemical pathways for producing pimelic acid, 7-aminoheptanoic acid, 7-hydroxyheptanoic acid, heptamethylenediamine or 1,7-heptanediol by forming two terminal functional groups, comprised of carboxyl, amine or hydroxyl group, in a C7 aliphatic backbone substrate. These pathways, metabolic engineering and cultivation strategies described herein rely on the fatty acid synthesis pathway and oxidative cleavage of long chain acyl-[acp] intermediates by a monooxgenase (e.g., cytochrome P450) such as that encoded by BioI from microorganisms such as Bacillus subtillis .
Abstract:
The system and methods described herein solve problems of inaccurate flow control, loss of optimum reactant gas feed ratios, and the associated inefficiencies brought on by variable humidity in reactant feedstream gases during production of hydrogen cyanide by an Andrussow process.
Abstract:
This document describes biochemical pathways for producing adipic acid, caprolactam, 6-aminohexanoic acid, 6-hydroxyhexanoic acid, hexamethylenediamine or 1,6-hexanediol by forming two terminal functional groups, comprised of carboxyl, amine or hydroxyl groups, in a C6 aliphatic backbone substrate. These pathways, metabolic engineering and cultivation strategies described herein rely on CoA-dependent elongation enzymes or analogues enzymes associated with the carbon storage pathways from polyhydroxyalkanoate accumulating bacteria.
Abstract:
In the hydrocyanation reaction of butadiene proceeding through pentenenitriles to adiponitrile, catalysis by complexes of zerovalent nickel with bidentate phosphorus-based ligands of the NiL 2 A type wherein L 2 is a bidentate ligand and A is an unsaturated compound, can be rate-limited by the solubility of the catalytic complex. The present invention concerns solvent compositions for the nickel-ligand complex comprising mixtures of unsaturated nitriles that provide for increased metal solubility, particularly in the absence of a Lewis acid promoter, resulting in higher hydrocyanation reaction rates in an industrial-scale process for production of important nylon manufacturing intermediates. The mixed nitrile solvent compositions can include mixtures of pentenenitriles and/or methylbutenenitriles. The mixtures of mixed unsaturated nitriles can be, at least in part, from recycle streams from the hydrocyanation reaction for which the nickel-bidentate ligand complexes are used as catalysts.
Abstract:
The invention includes needle punched composite fabrics that provide separate finish systems. A first finish is applied to the fiber batt prior to preparation of the composite. A second "overlay fiber finish" is provided subsequent to a needling process.