Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring
Subclass of:
549 - Organic compounds -- part of the class 532-570 series
549000000 - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1)
549000000 - HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1)
549200000 - Oxygen containing hetero ring (e.g., dioxirane, etc.)
549429000 - The hetero ring is five-membered
Patent class list (only not empty are listed)
Deeper subclasses:
Class / Patent application number | Description | Number of patent applications / Date published |
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549484000 | The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens | 60 |
549488000 | Additional chalcogen attached indirectly to the hetero ring by nonionic bonding | 38 |
549489000 | Preparation of furfural (i.e., furan-2-aldehyde) | 32 |
549490000 | Purification or recovery of furfural | 2 |
20110105770 | ADSORPTION SEPARATION PROCESSES FOR IONIC LIQUID CATALYTIC PROCESSES - Presently disclosed are methods and apparatus for separation of reaction products from reaction mixtures in an ionic liquid catalysis process, particularly in conversion of biomass, cellulose, and sugars into chemical intermediates such as 5-hydroxymethylfurfural (HMF). In one embodiment an ion exclusion adsorption mechanism is used for the separation process. The process comprises (i) mixing the ionic liquid-containing reaction mixture with de-ionized water, (ii) flowing the water solution mixture into an adsorption column, (iii) eluting the column with a water- and/or alcohol-based fluid, and (iv) collecting separated fractions at different elution times. | 05-05-2011 |
20140275581 | METHOD AND AN ARRANGEMENT FOR SEPARATING AT LEAST ONE CARBOXYLIC ACID AND FURFURAL FROM A DILUTE AQUEOUS MIXTURE THEREOF - The present invention relates to a method and an arrangement for separation and recovery of at least one carboxylic acid and furfural from a dilute aqueous mixture thereof. In the method of the present invention a dilute aqueous mixture comprising at least one carboxylic acid and furfural is extracted with methyltetrahydrofurane, and at least one carboxylic acid and furfural are recovered. The arrangement of the present invention comprises an extraction unit | 09-18-2014 |
Entries | ||
Document | Title | Date |
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20140187802 | Efficient, high-yield conversion of saccharides in a pure or crude form to 5-(chloromethyl)-2-furaldehyde - The present invention describes methods and apparatuses for the synthesis of 5-(chloromethyl)-2-furaldehyde (CMF) from saccharides in pure or crude form, the method comprising: (a) continuously contacting saccharides in pure or crude form, hydrochloric acid, and an organic solvent, by way of a continuous, biphasic-flow reactor assembly at a temperature from about 60 degrees C. to about 200 degrees C. and pressures from about 1 atmosphere to about 20 atmospheres, such that CMF is produced; (b) separating 5-(chloromethyl)-2-furaldehyde by liquid/liquid and solid/liquid phase separation; (c) producing at least five kilograms per day with at least 50% yield. Embodiments of the present invention can produce CMF in a continuous fashion, with high yield and without degradation of CMF to such side products as 5-(hydroxymethyl)furfural (HMF), 2-(2-hydroxyacetyl)furan (HAF) and levulinic acid (LA). | 07-03-2014 |
20160002190 | SOLID FORMS OF 5-(HALOMETHYL)FURFURAL AND METHODS FOR PREPARING THEREOF - Provided are solid forms of 5-(halomethyl)furfural, including a crystalline form of 5-(chloromethyl)furfural. Provided are also methods for preparing solid forms of 5-(halomethyl)furfural by crystallization using certain solvents. | 01-07-2016 |
20160002191 | METHODS FOR PURIFYING 5-(HALOMETHYL)FURFURAL - The present disclosure provides methods for purifying a 5-(halomethyl)furfural composition, including 5-(chloromethyl)furfural, at operating conditions that decrease or minimize the decomposition or degradation of 5-(chloromethyl)furfural during the process. The methods may employ certain solvents, operating conditions, and/or techniques (e.g., gas stripping). The gaseous 5-(halomethyl)furfural produced from the process can be condensed or deposited to yield 5-(halomethyl)furfural in liquid or solid form. The solid 5-(halomethyl) furfural may be amorphous or crystalline. | 01-07-2016 |
20190144408 | METHODS FOR PRODUCING 5-(HALOMETHYL)FURFURAL | 05-16-2019 |