1. A process for producing an unsubstituted or R-substituted poly(trimethylene carbonate) glycol comprising,
preparing a reaction mixture consisting essentially of an unsubstituted or R-substituted trimethylene carbonate, an acidic ion exchange resin as a catalyst, and one or more solvents at a temperature within the range of from the freezing point of the solvent(s) to about 30 degrees Celsius,
wherein the one or more solvents are substantially non-reactive with the unsubstituted or R-substituted trimethylene carbonate, and
wherein poly(trimethylene carbonate) glycol is produced in the reaction mixture.
2. The process of claim 1, wherein the ion exchange resin is selected from the group consisting of ion-exchange resins comprising poly(styrenesulfonic acid) crosslinked with divinylbenzene.
3. The process of claim 1, wherein the acidic ion exchange resin is a (tetrafluoroethyleneperfluoro(4-methyl-3,6-dioxa-7-octene-1-sulfonic acid) copolymer.
4. The process of claim 3, wherein the substantially non-reactive one or more solvents is selected from the group consisting of methylene chloride, toluene and dioxane.
5. The process of claim 1, further comprising isolating the poly(trimethylene carbonate) glycol.
6. The process of claim 1, wherein the unsubstituted or R-substituted poly(trimethylene carbonate) glycol has the structural formula,
wherein,
each R substituent is independently H, C1-C20 alkyl; C3-C20 cyclic alkyl; C6-C25 aryl; C6-C20 alkaryl; C6-C20 arylalkyl; and wherein each R substituent may form a cyclic structural group with adjacent R substituents; and n is 2 to 100.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A field equipment managing system comprising:
a field equipment;
a data collecting section for collecting a parameter of the field equipment at a predetermined period;
a field equipment database for storing the collected parameter; and
a diagnosing section for conducting a diagnosis of the field equipment by using the stored parameter.
2. The field equipment managing system according to claim 1, further comprising:
a controller for controlling the field equipment,
wherein the data collecting section starts collecting the parameter when the controller recognizes the field equipment.
3. The field equipment managing system according to claim 2, wherein the data collecting section stops collecting the parameter when the field equipment becomes unrecognized by the controller.
4. The field equipment managing system according to claim 1, further comprising:
a storing section for storing a collecting parameter defining file which designates the parameter to be collected,
wherein the data collecting section collects the parameter based on the collecting parameter defining file.
5. The field equipment managing system according to claim 1, further comprising:
a collecting parameter setting section,
wherein the collecting parameter setting section designates the parameter to be collected by the data collecting section, for every field equipment.
6. The field equipment managing system according to claim 1, further comprising:
a collecting parameter setting section,
wherein the collecting parameter setting section designates the period of collecting the parameter by the data collecting section, for every parameter.
7. The field equipment managing system according to claim 1, further comprising:
a controller for controlling the field equipment,
wherein the controller issues at least any one of an instruction to start collecting the parameter and an instruction to stop collecting the parameter, to the data collecting section.
8. The field equipment managing system according to claim 1, wherein the field equipment database stores an individual identifier of the field equipment and a logical identifier of the field equipment, in association with the parameter.
9. The field equipment managing system according to claim 1, wherein, when the field equipment is replaced with another field equipment, the diagnosing section selects to handle the parameter of the field equipment before the replacement and the parameter of the field equipment after the replacement as the parameters from the same field equipments or from the different field equipments.
10. The field equipment managing system according to claim 2, wherein the diagnosing section acquires at least any one of a history of a failure of the field equipment and a history of an alarm in a process from the controller, correlates the parameter stored in the field equipment database with the acquired history, and conducts the diagnosis of the field equipment based on the acquired history and the correlated parameter.
11. The field equipment managing system according to claim 10, wherein the diagnosing section conducts a failure prediction of the field equipment.