摘要:
Reactors including a chamber having a mixing apparatus within the chamber are provided. Reactors are also provided that include a chamber with a separation apparatus and/or a catalyst apparatus within the chamber. Reactor assemblies are provided that can include: a base configured to define at least a portion of a reaction chamber volume, a separation apparatus within the reaction chamber volume, a catalyst apparatus within the reaction chamber volume, and a lid coupled to both the separation and catalyst apparatuses. Production processes are provided that can include combining at least two reactants within a chamber to form a gas-phase reaction mixture and mechanically mixing the mixture within the chamber to form a product.
摘要:
The present invention includes chemical production processes and systems as well as methods for monitoring and altering reactor conditions. A method for monitoring reactor conditions includes monitoring reactant recovery stream density and altering the condition when the density reaches a predetermined amount. A chemical production system is provided that includes a reactor unit receiving a reactant recovery stream from a separation unit where the stream can be monitored by a density monitor. A chemical process is also provided that includes reacting a reactant and a starting material in a reactor unit having reactor parameters and producing a product stream that includes the reactant, a product, and a by-product. A recycle stream comprising the reactant and the by-product can be separated from the product stream and returned to the reactor unit. The recycle stream density can be monitored at least periodically and the reactor parameters altered as the density indicates an increased concentration of the by-product in the recycle stream.
摘要:
A method for preparing tetrabromobenzoate ester from a tetrabromophthalic anhydride including the steps of reacting the tetrabromophthalic anhydride with a catalyst and an alcohol at a temperature that favors partial esterification over complete esterification of the tetrabromophthalic anhydride to form a tetrabromophthalate half-ester reaction mixture; and feeding the half-ester reaction mixture to at least one reactor having and maintaining a temperature that favors decarboxylation over esterification to produce a tetrabromobenzoate ester-containing product. The temperature favoring partial esterification of the tetrabromophthalic anhydride is between about 70°C and 130°C. The temperature favoring decarboxylation over esterification is between about 190°C and 205°C. The tetrabromobenzoate ester-containing product comprises at least about 85% tetrabromobensoate ester. The at least one reactor may include two or more reactors connected to one another in series.
摘要:
A method of improving the rate of dissolution in water of low solubility compounds by combining a low solubility compound with a rheology additive that is made of platelets or particles which orient together with ionic or hydrogen bonds. The inventive method also may improve the hydrolytic stability of hydrolitically unstable low solubility compounds.
摘要:
A method of inhibiting the autooxidation of fatty acids in a paper product made from pulp fiber is accomplished by adding to the pulp fiber between about 2 moles/metric ton and about 10 moles/metric ton of an oxidizing halogen.
摘要:
A water-scavenging solvent, such a polyphosphoric acid, can be used for the synthesis of cyclopentyl 2-thienyl ketone by the direct acylation of cyclopentanecarboxylic acid without first reacting the cyclopentanecarboxylic acid with thionylchloride to form the acid chloride, while achieving new and unexpected yields. A tiletamine-free base can be made from the cyclopentyl 2-thienyl ketone with a halide in the presence of a solvent for the cyclopentyl 2-thienyl ketone to form a halogenated cyclopentane 2-thienyl ketone; aminating the halogenated cyclopentane 2-thienyl ketone by reaction with an amine; and subjecting the reaction product to thermal rearrangement, in a suitable solvent, and at a sufficient temperature to form tiletamine free base. Each step for the formation of tiletamine free base can be accomplished using the same solvent, e.g., dichlorobenzene so that intermediates need not be isolated between reactions.
摘要:
The present invention provides novel esters synthesized from organic alcohols and tetrahalophthalic anydride or tetrahalophthalic acid, processes to make such esters, and novel uses of these esters. The invention provides three Groups of dialkyltetrahalophthalate compositions which exhibit surprisingly advantageous features, including excellent plasticizing functionality and low smoke generation. The esters may be symmetrical, in that both alcohols of the ester are the same, or they may be unsymmetrical with both alcohols of the derived phthalate ester different, or they may be mixtures of symmetrical and unsymmetrical esters. Inventive esters are useful as flame-retardant plasticizers in PVC or other polymeric systems.
摘要:
A process for producing n-propyl bromide during the bromination of bis- of trisphenols uses non-aqueous n-propanol as the bromination solvent, providing salable yields of n-propyl bromide to accompany the brominated bisphenol or trisphenol.