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    • 3. 发明授权
    • Freezing process with a low pressure ice-making and a high pressure ice-melting operation
    • 具有低压制冰和高压冰淇淋操作的冷冻过程
    • US3690116A
    • 1972-09-12
    • US3690116D
    • 1967-12-06
    • CHENG CHEN YENSING WANG CHENG
    • CHENG CHEN-YENCHENG SING-WANG
    • C02F1/22B01D9/04
    • C02F1/22C02F2103/08Y02A20/132
    • The present invention relates to freezing processes, each one of which consists of a low pressure ice-making operation and a high pressure ice-melting operation. In the low pressure freezing step, water is flash vaporized from an aqueous solution under a vacuum to simultaneously produce ice crystals. The low pressure water vapor at pressures below triple point is either desublimed to form solid ice or absorbed into an aqueous solution at a temperature lower than 0* C. The separated ice crystals are melted under a high pressure to lower its melting point sufficiently so that the melting temperature becomes lower than the temperature at which the low pressure water vapor is either desublimed or absorbed in an aqueous solution. The low pressure water vapor and the separated ice crystals are in indirect heat exchange relation during these operations so that the heat released in the desublimation or absorption operation is utilized in the melting of ice crystals. The low pressure water vapor may also be brought into direct contact with a heat exchange medium which is at least partly in solid state to thereby simultaneously convert the water vapor into solid ice and melt the heat exchange medium.
    • 本发明涉及冷冻方法,其中每一种都包括低压制冰操作和高压冰融化操作。 在低压冷冻步骤中,水在真空下从水溶液中闪蒸,同时产生冰晶。 在低于三重点的压力下的低压水蒸气要么公开化以形成固体冰,或者在低于0℃的温度下吸收到水溶液中。将分离的冰晶体在高压下熔化以足以降低其熔点,使得 熔融温度变得低于低压水蒸汽在水溶液中公布或吸收的温度。 在这些操作过程中,低压水蒸汽和分离的冰晶体间接地具有热交换关系,从而在冰晶熔化中利用在发散或吸收操作中释放的热量。 低压水蒸气也可以与至少部分为固体状态的热交换介质直接接触,从而同时将水蒸汽转化成固体冰并熔化热交换介质。
    • 5. 发明授权
    • Indirect-freezing process with heat reuse by an auxiliary working medium
    • 通过辅助工作介质进行热再循环的间接冷冻过程
    • US3667243A
    • 1972-06-06
    • US3667243D
    • 1968-07-10
    • CHENG CHEN YENSING WANG CHENG
    • CHENG CHEN-YENCHENG SING-WANG
    • B01D9/04C02F1/22
    • C02F1/22B01D9/04C02F2103/08Y02A20/132
    • The present invention is related to a separation process by which a substance can be separated in a more or less purified state from a solution containing it. In the process, the solution is partially solidified by an indirect contact cooling operation and the deposited solid is then melted in situ to yield the purified substance. High quality deposit is obtained by maintaining an appropriate flow of the solution over the surface of the deposited solid during the solidification operation and by growing the deposit at a low growth rate. Heat reuse in these operations is accomplished by the help of an auxiliary working medium which undergoes a cyclic change. The medium undergoes an endothermic transformation, such as melting, vaporization, etc., to absorb the heat liberated during the partial solidification operation and undergoes the corresponding reverse operation, which is exothermic, to supply the heat required in melting the deposited solid. Since the transformation temperatures of both the main system and the auxiliary system during the operations described above are functions of the respective applied pressures, the temperature differentials required in these heat exchange operations between the main and the auxiliary systems can be obtained by selecting a suitable working medium and by maintaining the pressure applied to these systems during the operations or appropriate values. Work is supplied to the process through the necessary pressurization operations. The working medium used may undergo a set of solid liquid transformations, a set of liquid vapor transformations, or any other reversible transformations. When a rigid wall is used to separate the medium from the main system, the pressures applied to them may be different at a given time. However, when a deformable vessel is used to separate the two systems. both systems are maintained substantially at the same pressure at any given time. The processes of the present invention are classified according to the nature of transformations of the working medium and the nature of the wall separating the two systems. The equipments which can be used in these processes are also described.
    • 本发明涉及一种分离方法,通过该方法,物质可以或多或少地从含有它的溶液中分离出来。 在该过程中,通过间接接触冷却操作将溶液部分固化,然后将沉积的固体原位熔化,得到纯化物质。 通过在固化操作期间保持溶液在沉积的固体的表面上的适当流动并且以低生长速率生长沉积物来获得高质量的沉积物。 这些操作中的热再利用是通过经历周期性变化的辅助工作介质来实现的。 介质经历吸热转化,例如熔化,汽化等,以吸收部分凝固操作期间释放的热量,并进行相应的反应,这是放热的,以提供熔化沉积的固体所需的热量。 由于在上述操作期间主系统和辅助系统的转换温度是相应施加压力的函数,所以主系统和辅助系统之间的这些热交换操作所需的温差可以通过选择合适的工作 并且通过维持在操作期间施加到这些系统的压力或适当的值。 通过必要的加压操作将工作提供给过程。
    • 6. 发明授权
    • Fractional solidification process with heat reuse by the application of pressure
    • 通过压力应用具有热再利用的部分固化工艺
    • US3678696A
    • 1972-07-25
    • US3678696D
    • 1968-03-11
    • CHENG CHEN YENSING WANG CHENG
    • CHENG CHEN YENCHENG SING-WANG
    • B01D9/02B01D9/00
    • B01D9/0013B01D9/004
    • A fractional solidification process for separating relatively pure water from an aqueous solution, separating a solution into its components and purifying an impure substance by the so-called progressive freezing operation in which a feed solution is circulated through a conduit and is cooled through the conducting surface of the conduit. The improvement comprises of the followings: 1. Heat reuse is achieved by taking advantage of the change of melting point of a substance due to the application of pressure. 2. A unified freezer-melter which contains two sets of conduits, A-conduits and B-conduits, is used. A-conduits and B-conduits are in heat exchange relation through a metallic conductor and each set of these conduits are used alternately as a freezer and a melter. For separation of water, a high pressure is applied during the melting operation, and for the separation of other substances, a high pressure is applied during the freezing operation to create the temperature difference for heat transfer which is required in the heat reuse.
    • 用于从水溶液中分离相对纯水的分级固化方法,将溶液分离成其组分并通过所谓的逐步冷冻操作纯化不纯物质,其中进料溶液通过导管循环并通过导电表面冷却 的导管。 改进包括: