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1. CN1261817 - Electrochemical methods for recovery of ascorbic acid

Office Chine
Numéro de la demande 98806723.4
Date de la demande 30.06.1998
Numéro de publication 1261817
Date de publication 02.08.2000
Numéro de délivrance 1102073
Date de délivrance 26.02.2003
Type de publication C
CIB
B01D 61/46
BTECHNIQUES INDUSTRIELLES; TRANSPORTS
01PROCÉDÉS OU APPAREILS PHYSIQUES OU CHIMIQUES EN GÉNÉRAL
DSÉPARATION
61Procédés de séparation utilisant des membranes semi-perméables, p.ex. dialyse, osmose ou ultrafiltration; Appareils, accessoires ou opérations auxiliaires, spécialement adaptés à cet effet
42Electrodialyse; Electro-osmose
44Electrodialyse à sélectivité ionique
46Appareils à cet effet
B01D 61/44
BTECHNIQUES INDUSTRIELLES; TRANSPORTS
01PROCÉDÉS OU APPAREILS PHYSIQUES OU CHIMIQUES EN GÉNÉRAL
DSÉPARATION
61Procédés de séparation utilisant des membranes semi-perméables, p.ex. dialyse, osmose ou ultrafiltration; Appareils, accessoires ou opérations auxiliaires, spécialement adaptés à cet effet
42Electrodialyse; Electro-osmose
44Electrodialyse à sélectivité ionique
CPC
C25B 3/00
CCHEMISTRY; METALLURGY
25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
BELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
3Electrolytic production of organic compounds
B01D 61/44
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
61Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis, ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
42Electrodialysis; Electro-osmosis ; Electro-ultrafiltration
44Ion-selective electrodialysis
B01D 61/445
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
61Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis, ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
42Electrodialysis; Electro-osmosis ; Electro-ultrafiltration
44Ion-selective electrodialysis
445with bipolar membranes; Water splitting
C07D 307/62
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
307Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02not condensed with other rings
34having two or three double bonds between ring members or between ring members and non-ring members
56with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
62Three oxygen atoms, e.g. ascorbic acid
Déposants Electrosynthesis Co., Inc.
电合成公司
Inventeurs J. David Genders
J·戴维·让德斯
Dan M. Hartsough
丹·M·哈特索
Mandataires wang weiyu
中原信达知识产权代理有限责任公司
中原信达知识产权代理有限责任公司
Données relatives à la priorité 60/051,199 30.06.1997 US
Titre
(EN) Electrochemical methods for recovery of ascorbic acid
(ZH) 回收抗坏血酸的电化学方法
Abrégé
(EN)
The present invention relates to electrochemical methods for the recovery of ascorbic acid from an ascorbate salt without the co-generation of a waste salt stream and while maintaining high conductivity of the electrochemical cell thereby providing for quantitative conversion of the salts to ascorbic in both batch and continuous mode processes. In one embodiment the feed stream comprising an ascorbate salt is dissociated under the influence of an electric field and subjected to water splitting electrodialysis. The ascorbate ion combines with a proton and the salt cation combines with a hydroxyl ion to form ascorbic acid and base, respectively. The feed stream further comprises an inorganic salt which maintains high conductivity in the cell, facilitates quantitative conversion of ascorbate salts to ascorbid acid in both batch and continuous mode processes, and promotes precipitation and crystallization of ascorbid acid as a fine powder. Electrochemical cells useful in the methods include arrangements with a combination of at least one cation membrane, and at least one bipolar membrane in combination with at least one cation membrane.

(ZH)

本发明是关于从抗坏血酸盐中回收抗坏血酸而没有共生的废盐液流,并在维持电化学电池的高导电率时,提供了定量转换抗坏血酸盐成抗坏血酸的成批和连续生产的电化学方法。在一个实施方案中,含抗坏血酸盐的进料液流在电场的影响下被离解并经水离解电渗析的处理。抗坏血酸盐离子与质子结合而盐阳离子与羟基离子结合分别形成抗坏血酸和碱。进料液流另外含有维持电池内高导电率的无机盐,这助长了抗坏血酸盐成批或连续定量转换成抗坏血酸,还促进了抗坏血酸沉淀和结晶为细粉。用于所述这些方法的电化学电池包括具有至少一个阳离子膜和至少一个双极性膜的组合与至少一个阳离子膜联合在一起的装置。