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1. 发明授权

US5185693A Method and apparatus for providing backup process control 失效
标题翻译：提供备份过程控制的方法和装置
公开(公告)号：US5185693A
公开(公告)日：1993-02-09
申请号：US827920
申请日：1992-01-29
申请人： Donald B. Loftis , David W. Cawlfield
发明人： Donald B. Loftis , David W. Cawlfield
IPC分类号： G05B9/03 , G05B15/02 , G06F11/20
CPC分类号： G05B15/02 , G05B9/03 , G06F11/2028 , G06F11/2038 , G06F11/2097
摘要： In a backup mode of operation a process control program sends messages, via a local area network, to a process control program running in an active mode for the purpose of obtaining current values of process control data and configuration information. If the active process control program fails to respond to an interrogation by the backup process control program the backup program automatically activates itself to assume the active role. The activation procedure includes a sequence that transmits a control pulse of predetermined width on a line of an associated process control bus to a novel digital data switch. The receipt of a valid control pulse causes the digital data switch to allow access by the backup (now active) data processor to process control I/O unit(s) while simultaneously isolating the active (now backup) data processor from the I/O units. If a response is received the backup processor receives and stores within a memory current process related data such that in the event the backup processor is required to assume the active processor functions the backup processor is fully cognizant of the current state of the process control environment. The switch may also include a watch dog timer for monitoring activity of at least one bus signal line associated with the active data processor for indicating an occurrence of a failure of the active data processor.
摘要翻译：在备用操作模式中，过程控制程序通过局域网将消息发送到以活动模式运行的过程控制程序，以获得过程控制数据和配置信息的当前值。如果活动的过程控制程序无法响应备份过程控制程序的询问，备份程序将自动激活自己以承担主动角色。激活过程包括将相关过程控制总线的线路上的预定宽度的控制脉冲发送到新颖的数字数据交换机的序列。接收到有效的控制脉冲使得数字数据切换允许备份（现在有效的）数据处理器访问以处理控制I / O单元，同时将活动（现在备份）数据处理器与I / O隔离单位。如果接收到响应，则备份处理器在存储器当前进程相关数据中接收并存储，使得在备份处理器被要求承担主动处理器功能的情况下，备份处理器完全认识到过程控制环境的当前状态。开关还可以包括看门狗定时器，用于监视与活动数据处理器相关联的至少一个总线信号线的活动，以指示活动数据处理器的故障的发生。

2. 发明授权

US5318762A Process for treating aqueous solutions of hydroxylamine salts containing excess acid 失效
标题翻译：用于处理含有过量酸的羟胺盐水溶液的方法
公开(公告)号：US5318762A
公开(公告)日：1994-06-07
申请号：US988060
申请日：1992-12-09
申请人： David W. Cawlfield , Donald B. Loftis , Sanders H. Moore , Elizabeth K. Walter
发明人： David W. Cawlfield , Donald B. Loftis , Sanders H. Moore , Elizabeth K. Walter
IPC分类号： C01B21/14 , C01B21/20 , C07C239/08
CPC分类号： C01B21/1481
摘要： A process for treating solutions of a hydroxylammonium salt containing excess acid which comprises:a) mixing the hydroxylammonium salt containing excess acid with a hydroxylammonium solution containing free hydroxylamine to produce a solution of the hydroxylammonium salt substantially free of excess acid,b) contacting a portion of the solution of the hydroxylammonium salt substantially free of excess acid with a weak base ion exchange resin to produce the hydroxylammonium solution containing free hydroxylamine, and,c) recycling the hydroxylammonium solution containing free hydroxylamine to step a).The process minimizes the decomposition of the hydroxylammonium salt solution and produces high purity hydroxylammonium nitrate solutions without directly contacting excess nitric acid with ion exchange resins. In addition to hydroxylammonium salts, the process can be used to treat any nitrate salt of an anine weak base which contains excess nitric acid.
摘要翻译：一种用于处理含有过量酸的羟基铵盐的溶液的方法，其包括：a）将含有过量酸的羟基铵盐与含有游离羟胺的羟基铵溶液混合以产生基本上不含过量酸的羟基铵盐溶液，b）的羟基铵盐溶液与弱碱离子交换树脂基本上不含过量的酸，以产生含有游离羟胺的羟基铵溶液，和c）将含有游离羟胺的羟基铵溶液再循环到步骤a）。该方法使羟基铵盐溶液的分解最小化，并产生高纯度的硝酸铵溶液，而不会使过量的硝酸与离子交换树脂直接接触。除了羟基铵盐之外，该方法可用于处理含有过量硝酸的任何含有弱碱的硝酸盐。

3. 发明授权

US5023803A Process to control the addition of carbonate to electrolytic cell brine systems 失效
标题翻译：控制向电解池盐水系统中加入碳酸盐的方法
公开(公告)号：US5023803A
公开(公告)日：1991-06-11
申请号：US335315
申请日：1989-04-10
申请人： Donald B. Loftis , David D. Justice
发明人： Donald B. Loftis , David D. Justice
IPC分类号： B01J19/00 , C01D3/16 , G05D21/02
CPC分类号： C01D3/16 , B01J19/0006 , G05D21/02
摘要： A process to control the addition of excess carbonate to brine systems is provided wherein the process measures the raw brine flow rate through the carbonate reactors, the concentration of calcium in the brine feeding the reactors and the concentration of carbonate in the sodium carbonate feed tank to calculate the quantity of sodium carbonate necessary to remove substantially all of the calcium impurity in the brine by precipitating it out as a calcium carbonate flocculant. The process is automated and employs an information feed forward system.
摘要翻译：提供了一种控制向盐水系统中加入过量碳酸盐的方法，其中该方法测量通过碳酸酯反应器的原料盐水流速，进料反应器的盐水中的钙浓度和碳酸钠进料罐中碳酸盐的浓度，计算出通过将其作为碳酸钙絮凝剂沉淀出来，将盐水中基本上全部的钙杂质除去所需的碳酸钠的量。该过程是自动化的，并采用信息前馈系统。

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