Hermetically sealed printed circuit board
    2.
    发明授权
    Hermetically sealed printed circuit board 失效
    密封印刷电路板

    公开(公告)号:US5041943A

    公开(公告)日:1991-08-20

    申请号:US595338

    申请日:1990-10-10

    摘要: The invention relates to an improvement in dielectric type printed circuit boards having wells for mounting active circuit components on a metal substrate for heat dissipation. The improvement resides in a hermetic seal for the printed circuit board which includes a lid hermetically sealed to the top surface of the circuit board, as well as a chemically vapor deposited coating on the dielectric around the active components to prevent seepage of water and oxyen through the lid edges and into the well regions which would otherwise be detrimental to the active components.

    摘要翻译: 本发明涉及具有用于将有源电路部件安装在金属基板上用于散热的阱的电介质型印刷电路板的改进。 改进之处在于印刷电路板的气密密封,其包括密封到电路板的顶表面的盖子,以及围绕有源部件的电介质周围的化学气相沉积涂层,以防止渗水和渗透通过 盖子边缘并进入井区域,否则这些区域对活性组件是有害的。

    Solution mining of trona or nahcolite ore with aqueous NaOH and HCl
solvents
    4.
    发明授权
    Solution mining of trona or nahcolite ore with aqueous NaOH and HCl solvents 失效
    用NaOH和HCl溶剂溶液对天然碱或纳坦克矿石进行溶液开采

    公开(公告)号:US4498706A

    公开(公告)日:1985-02-12

    申请号:US523486

    申请日:1983-08-15

    CPC分类号: B01D61/44 E21B43/28 E21C41/20

    摘要: Separate deposits of trona or nahcolite ore are solution mined with two solvents, aqueous sodium hydroxide and aqueous hydrogen chloride. Aqueous sodium carbonate solution is withdrawn from the region of the NaOH-treated ore deposit, for recovery of soda ash. Aqueous sodium chloride brine is withdrawn from the region of the HCl-treated ore deposit and introduced to an electrodialysis cell to regenerate the two solvents and thereby continue the solution mining cycle.

    摘要翻译: 用两种溶剂,氢氧化钠水溶液和氯化氢水溶液开采溶液,分离出天然碱或纳坦克矿石的沉积物。 从NaOH处理的矿床的区域中取出碳酸钠水溶液,以回收苏打灰。 从HCl处理的矿床的区域中取出氯化钠水溶液,并将其引入电渗析池中以再生两种溶剂,从而继续溶液开采循环。

    Carbon treatment of monohydrate crystallizer liquor
    8.
    发明授权
    Carbon treatment of monohydrate crystallizer liquor 失效
    一水合物结晶液的碳处理

    公开(公告)号:US4299799A

    公开(公告)日:1981-11-10

    申请号:US138484

    申请日:1980-04-09

    IPC分类号: C01D7/12 C01D7/00 C22B26/10

    CPC分类号: C01D7/126

    摘要: Improved process for preparing sodium carbonate from crude trona without carbon column scaling by evaporating a portion of water from a clarified sodium carbonate solution to crystallize sodium carbonate crystals therefrom, separating the sodium carbonate crystals from the crystallizer liquor, passing only the crystallizer liquor which contains organic impurities through a carbon column to reduce the organic impurity concentration therein, and evaporating a portion of water from the carbon treated crystallizer liquor to crystallize additional sodium carbonate crystals.

    摘要翻译: 通过从澄清的碳酸钠溶液中蒸发一部分水以从其中结晶出碳酸钠晶体,从粗制天然碱制备碳酸钠而不进行碳柱结垢的改进方法,从结晶器液体中分离出碳酸钠晶体,仅将含有有机物的结晶器液体 杂质通过碳柱减少其中的有机杂质浓度,并蒸发一部分来自经碳处理的结晶器液体的水以结晶另外的碳酸钠晶体。

    Process for producing sodium carbonate
    9.
    发明授权
    Process for producing sodium carbonate 失效
    生产碳酸钠的方法

    公开(公告)号:US3933977A

    公开(公告)日:1976-01-20

    申请号:US432467

    申请日:1974-01-11

    CPC分类号: C01D7/37 C01D7/126

    摘要: This invention involves a process for producing high bulk density sodium carbonate from crude trona wherein sodium carbonate monohydrate purge streams containing high amounts of organic impurities are passed to an anhydrous crystallizer operated at temperatures above about 109.degree.C wherein anhydrous sodium carbonate crystals are formed having high bulk densities of about 60 to about 80 lbs/ft.sup.3.

    摘要翻译: 本发明涉及一种从粗天然碱生产高体积密度碳酸钠的方法,其中将含有大量有机杂质的碳酸钠一水合物清洗流通入在高于约109℃的温度下操作的无水结晶器,其中形成的高级无水碳酸钠晶体具有高 堆积密度约为60至80磅/平方英尺。

    Method of producing crystalline sodium aluminum phosphate
    10.
    发明授权
    Method of producing crystalline sodium aluminum phosphate 失效
    生产结晶磷酸铝钠的方法

    公开(公告)号:US4289739A

    公开(公告)日:1981-09-15

    申请号:US106634

    申请日:1979-12-26

    IPC分类号: C01B25/45 C01B25/26

    CPC分类号: C01B25/45

    摘要: In the production of SALP tetrahydrate wherein sodium carbonate and aluminum hydroxide are added to aqueous phosphoric acid, the viscous reactive mixture is agitated with water to free the SALP tetrahydrate crystals from the gelatinous matrix. The crystals are recovered by filtration or centrifugation.

    摘要翻译: 在生产其中将碳酸钠和氢氧化铝加入磷酸水溶液中的SALP四水合物的制备中,将粘性反应混合物用水搅拌以从凝胶状基质中释放SALP四水合物晶体。 通过过滤或离心回收晶体。