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72 条记录 (耗时 0.022 秒)

    Control apparatus for fractionation tower
    3.
    发明授权
    Control apparatus for fractionation tower 失效

    公开(公告)号：US3905873A

    公开(公告)日：1975-09-16

    申请号：US40000073

    申请日：1973-09-24

    申请人： STANDARD OIL CO OHIO

    发明人： WRIGHT ROBERT M ,  JOHNCOCK ALLAN W

    IPC分类号： B01D3/42 ,  C07D233/62 ,  C10G7/12

    CPC分类号： B01D3/425 ,  Y10S203/08

    摘要： Our novel control apparatus optimizes the operation of a fractionation tower. A feed varying in composition flows into the tower at an uncontrolled, varying rate. This feed is distilled so that a portion of the feed is withdrawn from the tower as distillate and another portion is withdrawn from the tower as bottoms. A part of the distillate is returned to the top of the tower as reflux. The control apparatus includes a reflux controller for automatically controlling the rate at which reflux is returned to the tower, a pressure controller for automatically controlling the pressure within the tower, a distillate controller for automatically controlling the rate at which distillate is withdrawn from the tower, and a bottoms controller for automatically controlling the rate at which bottoms are withdrawn from the tower. As the feed flow rate and feed composition change, distillate and bottoms flow rates are changed in proportion to these changes in feed. A divider circuit, responding to the feed flow rate and feed composition changes, controls the distillate and bottoms flow controllers so that the distillate and bottoms flow rates and the ratio between these flow rates are such that product specifications are maintained despite variations in the feed flow rate and feed composition. An override circuit, responding to fluctuations in the liquid level in the tower, controls the material balance within the tower. When the liquid level is in danger of exceeding predetermined level limits, the override circuit terminates control of the bottoms controller by the divider circuit and controls the bottoms controller as a function of the liquid level until the liquid level is no longer in danger of exceeding the predetermined level limits. The control apparatus includes means calibrated to maintain the bottoms flow rate such that the liquid level is within the level limits, and calibration means which calibrate said calibrated means whenever the override circuit terminates the divider circuit''s control of the bottoms controller. The pressure controller maintains the tower pressure essentially constant, and it includes means for controlling the rate at which heat flows into the tower so that said heat flow rate is changed in response to any incipient pressure changes to maintain tower pressure essentially constant. The reflux controller includes means responsive to the reflux temperature for modifying the reflux flow rate as the reflux temperature deviates from a standard temperature. This reflux controller also includes means for establishing a maximum and minimum reflux flow rate. Preferably, the control apparatus also includes means for manually adjusting the ratio between the distillate and bottoms flow rates and for manually controlling the distillate and bottoms reflux and heat flow rates.

    Phosphorus-containing polyarylenes
    5.
    发明授权
    Phosphorus-containing polyarylenes 失效
    含磷的聚芳烯

    公开(公告)号：US3903044A

    公开(公告)日：1975-09-02

    申请号：US43325674

    申请日：1974-01-14

    申请人： STANDARD OIL CO OHIO

    发明人： WANG CHEN-SHEN

    IPC分类号： C08G61/10 ,  C08L101/00 ,  C08G33/16

    CPC分类号： C08L101/00 ,  C08G61/10 ,  Y10S525/915 ,  C08L65/02

    摘要： A phosphorus-containing polyarylene is disclosed which is prepared by reacting a polyarylene with a member of a particular class of phosphorus-containing compounds. The product polyarylene is useful as a flame-retardant material in thermoplastics and cellular polymers.

    摘要翻译： 公开了一种含磷聚亚芳基，其通过使聚亚芳基与特定类别的含磷化合物的成员反应来制备。 产品聚亚芳基可用作热塑性塑料和细胞聚合物中的阻燃材料。

    Purification of phenylindane carboxylic acids by permanganate treatment of the sodium salts
    6.
    发明授权
    Purification of phenylindane carboxylic acids by permanganate treatment of the sodium salts 失效
    通过硫酸钠处理钠盐来净化苯乙烯羧酸

    公开(公告)号：US3699160A

    公开(公告)日：1972-10-17

    申请号：US3699160D

    申请日：1968-03-27

    申请人： STANDARD OIL CO OHIO

    发明人： STEITZ ALFRED JR

    IPC分类号： C07C51/42

    CPC分类号： C07C51/42

    摘要： Phenylindane carboxylic acids are purified by low concentration permanganate treatment at pH upward from 10 and carbon treatment to remove at least manganous ions. The process is particularly useful for the purification of phenylindane dicarboxylic acids that are to be converted to the beta hydroxy alkyl esters from which corresponding film and fiber forming polyesters are made.

    摘要翻译： 苯二甲酸羧酸通过低浓度高锰酸盐处理，从10上升至pH，并进行碳处理以除去至少三价锰离子。 该方法特别可用于纯化待转化成制备相应的成膜和成纤的聚酯的β羟基烷基酯的苯基二茚基二羧酸。