TH51259A - Processes and machines for cooling hot reaction gases. For example, for the production of phthalic anhydride. - Google Patents

Abstract

The DC60 describes a process for cooling hot reactive gases. As happened In the preparation of phthalic anhydride by The oxidation of o-xylene (213) is given to a temperature at a predetermined inlet for the introduction of the separator (221), where the separation in the separator leads to the phthalic effect. Raw anhydride and air Simple and economical layouts Which can be used For the comparison process of the operating system This modality for cooling the hot reaction gas provides low maintenance costs at the same time. Which will be achieved by placing The source position of the separator (221) with the heat exchanger (227) where the medium is cooled Heat will flow through Will give a reaction gas This heat is passed through a heat exchanger (227) to rate the cooling medium. Especially This reaction system will further integrate. In primary reactors (213) or end reactors (241), there may be a way for Intermediate Cooling (243) describes the process for cooling hot reactive gases. As happened In the preparation of phthalic anhydride by The oxidation of o-xylene (213) is given to a temperature at a predetermined inlet for the introduction of the separator (221), where the separation in the separator leads to the phthalic effect. Raw anhydride and air Simple and economical layouts Which can be used For the comparison process of the operating system This hot reaction gas cooling action provides low maintenance costs at the same time. Which will be achieved by placing The source position of the separator (221) with the heat exchanger (227) where the medium is cooled Heat will flow through Will let the gas react This heat is passed through a heat exchanger (227) to act with the cooling medium. Especially This reaction system will include In addition to the main device (213) or the end device (241), there may be a way for intermediate cooling (243).

Claims (9)

1. The process for the production of phthalic anhydride (PAA) by oxidation of o-xylene in the presence of a two-stage catalyst in the main reactor and the reactor. An optional end-of-current scenario in which the hot reactive gas from the generator Principle which includes o-xylene and this air will Has been drained Heat it to the temperature at the specified inlet. In advance for navigation Into a separate machine Where to arrange The heat exchanger through which the cooling medium flows is positioned at the source of this separator. And let gas react This hot action passes through the heat exchanger to interact with this cooling medium. 2. Process as requested in Clause 1, where in PAA production plants without equipment At the end of that stream, the temperature at the inlet for introducing this reactive gas into the exchanger Will change the heat The temperature is from 250 to 400 degrees Celsius, if so, it should have a temperature from 350 to 380 degrees Celsius and in PAA plants with end-of-the-current generator should be from 280 to 320 degrees Celsius and the temperature at the The output of the reactive gas from this heat exchanger has a temperature of 130 to 180 degrees Celsius. If so, it should be around 160 degrees Celsius. 3. Process according to one or two of the right to claim clause 1 or 2 that will cause the drainage The heat of the reactive gas This is the result in one step. 4. Process for the request of any one of Clause 1 to 3 in which the intermediary will be used. Gas type heating 5. Process as requested in claim 4, where this type of gas cooling medium is air 6. Process by requesting any one of Clause 1 to 5 where the temperature at the inlet Of the cooling medium The hot water entering the heat exchanger is below 100 ° C, and the temperature at the outlet in the exit This heat exchanger has a temperature of 300 to 350 degrees Celsius. This temperature should be about 330 degrees Celsius. 7. Process by which one of Clause 1 to 6 is requested for the right to enter the drain medium. Heat has been done To heat by interacting with this reaction gas into Device as Is one of the reactants for This chemistry 8. A machine for cooling hot reactive gas. To the temperature at the specified inlet In advance for Brought into a separate machine after the reaction that was preceding This in the device Primary and optional for The device at the end of the next stream Which includes: (a) path for main operation (113,213) (b) path for heat exchange (127,227) (c) end-current generator (241 ) An alternative path (b) and a path for alternative intermediate cooling (d) a path for product separation from reaction (121,221) and connection with and Connection between (a) and (b) paths 9. The device as requested in Clause 8, where the path (c) will be established as one or more parts 1. 0. Any device requested in any of Clause 8 or 9, where, from that path (b) optionally, Start to force the temperature on the bypass