Abstract:
A method for preparing a controlled-release composition for biologically active materials, the composition consisting of amphiphilic substances capable of forming liquid crystalline phases, especially cubic phases, in aqueous medium. The bioactive material is either dissolved or dispersed in the liquid crystalline phase, or alternatively, coated by the liquid crystalline phase. The invention is advantageous from thermodynamical and mechanical points of view, and a rich variety of applications exists.
Abstract:
Dispersion which comprises water, pulverized coal and additive and is stable in storage, can be pumped and can be burnt by conventional technique. The coal content of the dispersion ranges from 60 to 85% by weight and the dispersion contains at least one substance adsorbed to the surfaces of the coal particles, which provides repulsion between the coal particles by hydration forces.
Abstract:
Method for handling a coal-water suspension to be stored in a tank (10) connected to a burner (12), and to be supplied to the burner for combustion therein. In order to avoid the necessity of storing the coal-water suspension in the tank under continuous stirring, said suspension is stored in a heavy condition in the tank. Then, a defined volume of the coal-water suspension is being stirred and after dilution water is supplied in a more fluid, well suspended homogenized condition to the burner for combustion. The invention also relates to a stirring tank (13) for receiving the defined volume while stirring said volume.
Abstract:
Dispersion containing water, pulverized coal and additives, which is stable for storage, pumpable and combustible by conventional technique applied for liquid fuels. The coal content amounts to at least 55 % by weight. The dispersion contains as an additive a ionic surfactant polymer with at least one hydrophobic part with great affinity to the coal surface and at least one hydrophilic part based on ethylene oxide with the mole weight exceeding 1,000. The charge of the polymer is preferably zwitterionic or cationic.
Abstract:
Dispersion which comprises water, pulverized coal and additive and is stable in storage, can be pumped and can be burnt by conventional technique. The coal content of the dispersion ranges from 60 to 85 % by weight and the dispersion contains at least one substance adsorbed to the surfaces of the coal particles, which provides repulsion between the coal particles by hydration forces.
Abstract:
Liquid fuel based on pulverized coal, water and additives, the coal content being at least 55 %. The fuel is suitable for transport in pipelines or direct combustion. A heavily increased dispersion effect as compared with prior art additives is achieved by chemical addition or connection of several aromatic rings to a hydrophilic polymer chain. The polymer chain preferably comprises an anionic or non-ionic graft block copolymerisate.
Abstract:
Dispersion which comprises water, pulverized coal and additives and is stable in storage, can be pumped and can be burned by conventional technique. The coal content of the dispersion ranges from 60 to 80% by weight and the dispersion contains at least one amphiphile substance adsorbed to the surfaces of the coal particles, which provides repulsion between the coal particles by hydration forces, and also polymers cooperating with said substance, at least one of said polymers containing segments of hydrophobic as well as hydrophilic character.
Abstract:
A dispersing agent for solid, hydrophobic particles in water, comprising polymerized fatty acids, polymerized rosin acids and/or optionally polymerized fatty or rosin acid derivatives, which have been partially esterified with a polyalkylene glycol or a monoester or monoether thereof, having a residual acid value higher than 3.
Abstract:
The dispersion contains: (i) at least 55 wt.% pulverised coal, the surface of which has been modified by adsorption of switterionic or other hydrophobising substances, added during flotation and/or dewatering; (ii) water; and (iii) as dispersant, an additive whose mol. has a hydrophobic segment with a strong affinity for the coal surface, contg. at least 2 aromatic rings, and attached to it an anionic or nonionic hydrophilic polymer chain or an anionic or nonionic graft copolymer with amphiphilic properties. Coal flotation may be effected with the addn. of one or more of aliphatic alcohols, frothing agents, zwitterionic surfactants (e.g. lecithin) and alkyl sulphosuccinates. Surfactants which may be added during dewatering are alkylaryl sulphonates and alkylsulphosuccinates. The dispersion is useful for transporting coal, and as an alternative to oil for steam prodn. or heating. Only half the concn. of dispersant is needed for the same effect on rheology as of conventional dispersants.
Abstract:
METODO DE PRODUCCION DE DISPERSIONES DE CARBON-AGUA, QUE TIENEN AL MENOS 55 DE CARBON.CONSISTE EN LA MODIFICACION DE LA SUPERFICIE DEL CARBON POR ABSORCION SOBRE LA MISMA DE ADITIVOS SWITTERIONICOS O HIDROFOBIZANTES, QUE CONSTAN DE AL MENOS UNA CADENA POLIMERICA HIDROFILA ANIONICA O NO IONICA O UN COPOLIMERO DE INJERTO-BLOQUE ANIONICO O NO IONICO, CON PROPIEDADES ANIFILICAS, ENLAZADO A, POR LO MENOS, UN SEGMENTO DE PARTE HIDROFOSA.ESTAS DISPERSIONES TIENEN APLICACIONES COMO COMBUSTIBLES LIQUIDOS.