Document xzpXmDr1VGjgRQooK5QRMpbpJ

/ Ethanolamines/Glycol Ethers In Plant Training (IPT) Section Number Issue Number Origination Date Revision Date Section Test 4A 1.2 10-29-91 12-09-94 4A Author: Clyde Williber Ethanolamines - Reactor Area R-201 & R-202 Answers: 1. Physically locate: A. MX-201 B. PSV R-201 A/B C. EJ-201 A/B D. Aqua ammonia control valve E. R-201 shell pressure control loop F. PSV E-201 A/B G. R-201 outlet hi/lo pressure transmitters H. Oxide control valve to R-201 I. E-201 A J. 30# steam make up K. Condensate make up L. P-200 M. Process water tie in to E-201 A 2. Explain the physical features of R-201. A. How many passes through R-201? 22 B. What is each pass made up of? Stainless steel tube bundles consisting of 60 5/8ths tubes wrapped around a 3/4ths inch tube. C. Where are the temperature probes in each pass? The center tube has three thermocouples- one in the center and one in each end. D. How many temperature probes are there? 3 on each pass - 66 in R-201. Date Printed: April 18, 1998 Paper Copies Of This Document Are Uncontrolled & Not Subject To Update. The Controlled Document Resides In File: T:\ORIGINAL\IPT\EAFRONT\RXSYSTEM\AR201.DOC Page 1 Of 4 DO A 058572 CONFIDENTIAL E. How are R-201 and E-201A connected? The shell of R-201 and the shell of E-201 are connected by a rectangular opening called a plenum chamber. 3. Explain the purpose of P-200. Re-circulates condensate on the shell side of r-201 to have a more consistent temperature throughout the shell. A. What does it pump? Condensate B. Where does it pump it to? 1. Re-circulates condensate to the top of R-201. 2. Re-circulates condensate to the bottom (3 places) of R-201. 3. Pumps it to the ditch. 4. State how condensate flow into R-201 shell is controlled. From P-511 condensate header through R-201 level control valve. A. Locate condensate control valve. B. State where the condensate level in R-201 shell should be. Level needs to be above the highest tube bundle to be able to remove the heat of reaction. 5. State why we have steam piped to R-201 shell. State what type steam. Locate steam valve to R-201 shell. 30# steam is used to preheat the shell side of the reactor so that the EO/aqua ammonia reaction will start faster in the tube side. 6. Explain how the pressure in E-201A and R-201 shell are maintained. Steam ejectors (EJ-201 A/B), are used to pull a vacuum. A pressure control valve false loads the ejector with air to control the pressure. 7. Explain the purpose of E-201 A. Remove the heat of reaction from the condensate in the shell side. A. What utility flows are piped up to E-201A. Cooling tower water with process water as a backup. B. Locate the process water block valve to E-201 A. 8. Explain how R-201 temperature and pressure are related. Date Printed: April 18, 1998 Paper Copies Of This Document Are Uncontrolled & Not Subject To Update. The Controlled Document Resides In File: T:\ORIGINAL\IPT\EAFRONT\RXSYSTEM\AR201.DOC Page 2 Of 4 DO A 058573 CONFIDENTIAL As the pressure rises so does the temperature. 9. State what the lowest temperature on R-201 before putting oxide on. 65-70 degrees c. 10. Explain how you would know that you had oxide not completely reacting in R-201 and getting through to R-202. The temperature in R-202 would be higher than R-201 outlet. The reaction in R-202 would be heating up. 11. Explain the purpose of R-202. R-202's purpose is to give the space for any remaining EO to react. It is a safety precaution to insure the reaction takes place in a controlled vessel made for reactions. 12. State how the inside of R-202 is made. Stainless steel, 30 alternating baffles. 13. Explain what could happen if R-201 or R-202 had a high temperature or hot spot. The ammonia/EO Mixture could vaporize, leading to an uncontrolled reaction. The reactor would pressure up, blowing the PSV's, causing the ammonia/EO Mixture to be vented to the sump. The reactor system would trip and shutdown. **Note: Explosions are possible results of uncontrolled reactions.** 14. Explain what is the maximum amount of oxide you would allow in R-202 inlet and outlet. Inlet- not more than would bring R-202 temp up 10-12 degrees c. Outlet- none. 15. Explain what the line-of-logic is. Instrument nest that monitors temperatures, pressures, ratios, and critical pump status. It has the ability to trip off or shut down the reactor if indications are out of control. 16. State what raw materials are fed into R-201 and what the reactor effluent is made up of. Ethylene oxide and aqua ammonia, amines as recycle and C02 at times are fed in. Crude Ethanolamines (MEA, DEA, TEA, & Highers), ammonia, some glycols, and H20 make up the reactor effluent. 17. Locate and explain the function of the ammonia vent header. State what product streams vent into this header. The vent headers purpose is to dilute any product stream vented to the sump through the PSV's. 30# steam and process water trip on rising pressure in the header to dilute liquid and reduce vapor. All product vessels which contain ammonia vent into this vent header. 18. State why we sometimes recycle MEA or DEA. Recycling MEA produces more DEA. Recycling DEA produces more tea. Recycle is another way of controlling the concentration of production. Date Printed: April 18, 1998 Paper Copies Of This Document Are Uncontrolled & Not Subject To Update. The Controlled Document Resides In File: T:\ORIGINAL\1P7\EAFRONT\RXSYSTEM\AR201.DOC Page 3 Of 4 DO A 058574 CONFIDENTIAL Revisions: Revision No. 1 Revision No. 2 06-28-93 12-09-94 Yearly Review Yearly Review Date Printed: April 18, 1998 Paper Copies Of This Document Are Uncontrolled & Not Subject To Update. The Controlled Document Resides In File: T:\ORIGINAL\IPT\EAFRONT\RXSYSTEM\AR201.DOC Page 4 Of 4 DO A 058575 CONF Id?NTTAL