{"id":1451,"date":"2020-06-25T15:57:57","date_gmt":"2020-06-25T19:57:57","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/chbe220\/?post_type=part&p=1451"},"modified":"2020-07-07T12:46:23","modified_gmt":"2020-07-07T16:46:23","slug":"unsteady-state-operations-and-process-control","status":"publish","type":"part","link":"https:\/\/pressbooks.bccampus.ca\/chbe220\/part\/unsteady-state-operations-and-process-control\/","title":{"raw":"Unsteady-state Operations and Process Control","rendered":"Unsteady-state Operations and Process Control"},"content":{"raw":"

Introduction<\/h2>\r\nIn this chapter, we will introduce unsteady-state operations, which are very common in chemical processing. Since unsteady-state balance systems are transient, we will explore deriving material balances and determining their initial conditions. We will also look at process control strategies, which are used to measure and manipulate processes in plants.\r\n\r\n \r\n
\r\n

Learning Objectives<\/p>\r\n\r\n<\/header>\r\n

\r\n\r\nBy the end of this chapter, you should be able to:\r\n\r\nRecognize\u00a0<\/strong>unsteady-state balance systems.\r\n\r\nDerive<\/strong> material balance equations.\r\n\r\nProvide<\/strong> initial conditions for well-mixed separable transient single-unit processes.\r\n\r\nSolve <\/strong>separable\u00a0transient balances to find a property of a system at any given time.\r\n\r\nProvide<\/strong> initial conditions for well-mixed non-separable transient single-unit processes.\r\n\r\nSet-up <\/strong>separable transient balances.\r\n\r\nApply<\/strong> control strategies to control common process variables: flow, liquid pressure, liquid level, and temperature of endothermic process streams.\r\n\r\n<\/div>\r\n<\/div>\r\nAs you're going through this chapter, here are some important terms for you to take note of:\r\n
    \r\n \t
  • unsteady-state<\/li>\r\n \t
  • input<\/li>\r\n \t
  • output<\/li>\r\n \t
  • generation<\/li>\r\n \t
  • consumption<\/li>\r\n \t
  • accumulation<\/li>\r\n \t
  • transient balances<\/li>\r\n \t
  • boundary conditions<\/li>\r\n \t
  • separable differential equation<\/li>\r\n \t
  • nonseparable differential equation<\/li>\r\n \t
  • continuous stirred tank reactor (CSTR)<\/li>\r\n \t
  • set-point<\/li>\r\n \t
  • disturbance variable<\/li>\r\n \t
  • manipulated variable<\/li>\r\n \t
  • process variable<\/li>\r\n \t
  • controlled variable<\/li>\r\n \t
  • obstruction meter<\/li>\r\n \t
  • rotational or turbine flowmeter<\/li>\r\n \t
  • float measure<\/li>\r\n \t
  • sonic\/radar<\/li>\r\n \t
  • manometer<\/li>\r\n \t
  • differential pressure cell<\/li>\r\n \t
  • expansion-based temperature measure<\/li>\r\n \t
  • electrical temperature measure<\/li>\r\n \t
  • endothermic control loop<\/li>\r\n<\/ul>","rendered":"

    Introduction<\/h2>\n

    In this chapter, we will introduce unsteady-state operations, which are very common in chemical processing. Since unsteady-state balance systems are transient, we will explore deriving material balances and determining their initial conditions. We will also look at process control strategies, which are used to measure and manipulate processes in plants.<\/p>\n

     <\/p>\n

    \n
    \n

    Learning Objectives<\/p>\n<\/header>\n

    \n

    By the end of this chapter, you should be able to:<\/p>\n

    Recognize\u00a0<\/strong>unsteady-state balance systems.<\/p>\n

    Derive<\/strong> material balance equations.<\/p>\n

    Provide<\/strong> initial conditions for well-mixed separable transient single-unit processes.<\/p>\n

    Solve <\/strong>separable\u00a0transient balances to find a property of a system at any given time.<\/p>\n

    Provide<\/strong> initial conditions for well-mixed non-separable transient single-unit processes.<\/p>\n

    Set-up <\/strong>separable transient balances.<\/p>\n

    Apply<\/strong> control strategies to control common process variables: flow, liquid pressure, liquid level, and temperature of endothermic process streams.<\/p>\n<\/div>\n<\/div>\n

    As you’re going through this chapter, here are some important terms for you to take note of:<\/p>\n

      \n
    • unsteady-state<\/li>\n
    • input<\/li>\n
    • output<\/li>\n
    • generation<\/li>\n
    • consumption<\/li>\n
    • accumulation<\/li>\n
    • transient balances<\/li>\n
    • boundary conditions<\/li>\n
    • separable differential equation<\/li>\n
    • nonseparable differential equation<\/li>\n
    • continuous stirred tank reactor (CSTR)<\/li>\n
    • set-point<\/li>\n
    • disturbance variable<\/li>\n
    • manipulated variable<\/li>\n
    • process variable<\/li>\n
    • controlled variable<\/li>\n
    • obstruction meter<\/li>\n
    • rotational or turbine flowmeter<\/li>\n
    • float measure<\/li>\n
    • sonic\/radar<\/li>\n
    • manometer<\/li>\n
    • differential pressure cell<\/li>\n
    • expansion-based temperature measure<\/li>\n
    • electrical temperature measure<\/li>\n
    • endothermic control loop<\/li>\n<\/ul>\n","protected":false},"parent":0,"menu_order":4,"template":"","meta":{"pb_part_invisible":false,"pb_part_invisible_string":""},"contributor":[],"license":[],"class_list":["post-1451","part","type-part","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/pressbooks\/v2\/parts\/1451","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/pressbooks\/v2\/parts"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/wp\/v2\/types\/part"}],"version-history":[{"count":3,"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/pressbooks\/v2\/parts\/1451\/revisions"}],"predecessor-version":[{"id":1871,"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/pressbooks\/v2\/parts\/1451\/revisions\/1871"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/wp\/v2\/media?parent=1451"}],"wp:term":[{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/wp\/v2\/contributor?post=1451"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/chbe220\/wp-json\/wp\/v2\/license?post=1451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}