Process for the preparation of carbon fibers having structure reflected
in cross sectional view thereof as random mosaic
    2.
    发明授权
    Process for the preparation of carbon fibers having structure reflected in cross sectional view thereof as random mosaic 失效
    具有以其横截面图反映的结构的碳纤维的制备方法为随机镶嵌

    公开(公告)号:US4746470A

    公开(公告)日:1988-05-24

    申请号:US601122

    申请日:1984-04-18

    CPC分类号: D01F9/00 D01F9/145

    摘要: A process for preparing carbon fibers wherein carbon fibers are prepared from the mesophase-pitch containing not more than 80% by weight of a quinoline-insoluble component and showing, under a polarization microscope, more than 70% of optically anisotropic region, comprising the steps of subjecting a mesophase-pitch showing a viscosity of 10 to 100 poise at a temperature of spinning of 330.degree. to 450.degree. C., to rotating-centrifugal-spinning in a rotating-centrifugal spinning machine with a peripheral velocity of rotating nozzle thereof of 300 to 1000 m/min and exposing the thus spun fibers of the mesophase pitch to a flow of a gas spouting into a spinning direction at a temperature of 280.degree. to 400.degree. C. and at a linear velocity of 50 to 200 m/sec, thereby preparing carbon fibers showing a random-mosaic structural pattern in cross section thereof perpendicular to fiber axis.

    摘要翻译: 一种制备碳纤维的方法,其中碳纤维由含有不超过80重量%的喹啉不溶组分的中间相沥青制备,并且在偏振显微镜下显示超过70%的光学各向异性区域,其包括步骤 在330〜450℃的纺丝温度下使粘度为10〜100泊的中间相沥青进行旋转离心纺丝,旋转离心纺丝机的圆周速度为 300〜1000m /分钟,将这样纺丝的中间相沥青的纤维在280℃〜400℃的温度和50〜200m /秒的线速度下喷射到纺丝方向的气体流 从而制备在垂直于纤维轴线的横截面上显示随机马赛克结构图案的碳纤维。

    Method for the production of alpha type calcium sulfate hemihydrate
    4.
    发明授权
    Method for the production of alpha type calcium sulfate hemihydrate 失效
    生产α型硫酸钙半水合物的方法

    公开(公告)号:US4091080A

    公开(公告)日:1978-05-23

    申请号:US732429

    申请日:1976-10-14

    CPC分类号: C01F11/466 C04B11/024

    摘要: Alpha type calcium sulfate hemihydrate gypsum is obtained by suspending gypsum in an aqueous solution containing a specific monocarboxylate in a specific concentration and heating the resultant suspension in a specific temperature range under atmospheric pressure. The production of this alpha type calcium sulfate hemihydrate is accomplished at an increased rate by adding a specific monocarboxylic acid to the aqueous solution, suspending gypsum in the resultant solution and heating the resultant suspension in a specific temperature range under atmospheric pressure.

    摘要翻译: 通过将石膏悬浮在特定浓度的特定单羧酸盐的水溶液中并在大气压下在特定温度范围内加热得到的悬浮液,得到α型硫酸钙半水石膏。 通过向水溶液中加入特定的一元羧酸,将石膏悬浮在所得溶液中并在大气压下在特定温度范围内加热得到的悬浮液,以增加的速率实现了该α型硫酸钙半水合物的生产。

    Method for the treatment of heavy petroleum oil
    6.
    发明授权
    Method for the treatment of heavy petroleum oil 失效
    重质石油的处理方法

    公开(公告)号:US4042487A

    公开(公告)日:1977-08-16

    申请号:US683925

    申请日:1976-05-06

    摘要: In the thermal cracking of a heavy petroleum oil (having an API specific gravity of not more than 25) in a tubular type heating furnace, possible occurrence of coking trouble inside the furnace can be prevented by applying a magnetic field of fixed magnitude transversely to the flow of the heavy petroleum oil being introduced into the furnace or by applying a fixed magnitude of magnetic field transversely and, at the same time, applying a fixed magnitude of direct-current voltage parallel to the flow of the heavy petroleum oil being introduced into the furnace. More effective prevention of occurrence of coking can be obtained by having a specific inorganic substance incorporated in the heavy petroleum oil before the oil is subjected to the magnetic field or to simultaneous application of the magnetic field and voltage.

    摘要翻译: 在管状加热炉中,在重质石油油(API比重不大于25)的热裂解中,可以通过施加横截面上固定大小的磁场来防止炉内焦化问题的发生 将重质石油的流动引入炉中或通过横向施加固定大小的磁场,同时施加与被引入到重油中的重质石油的流平行的固定大小的直流电压 炉。 可以通过在油经受磁场之前将重质石油中的特定无机物质并入或同时施加磁场和电压来获得更有效地防止焦化的发生。