How should this passage be translated? Regarding the alkylation reactor

It can operate either after the reactor filling is complete or when the ethylene feed to the alkylation reactor does not pass through the processor (for example, when the medium in the processor is being replaced)； The purpose of doing this is to avoid a situation where the ethylene supply is exhausted yet it is not possible to switch to the ethylene feed for the alkylation reaction system.

Either upon completion of reactor filling or when the Alkylation Reactor System is already operating with ethylene feed bypassing the treater (i.e., when the treater’s media is being replaced). The goal is to avoid completing the ethylene filling process only to find that it is no longer possible to switch to ethylene feed for the Alkylation Reactor System. The previous sentence seems incomplete; the use of “i.e.” by the original poster is likely intended to clarify the preceding explanation. Tentative translation: ……that is, at the end of reactor filling or when the Alkylation Reactor System is in operation with ethylene feed bypassing the treater (for example, when the treater’s media is being replaced). The purpose is to prevent the situation where, after the ethylene filling phase is completed, the ethylene feed cannot be switched to the alkylation reaction system.

Why doesn’t it work for me to rate others? The system says I can still get 20 points. It would be better to change “REPLACE” to “substitution,” as it refers to fluid materials, and not to equipment components or catalysts. The latter sentence means agreeing with what was said on the 2nd floor. The key lies in the “switch” in logistics, and the relationship between those modifiers is captured very accurately. The previous sentence is incomplete; it’s just a half sentence that functions as a temporal adverbial clause. It’s hard to determine the relationship between it and the description of the purpose in the following sentence without knowing what operation is mentioned earlier.

I took another close look, and I understood the meaning. Mainly, I didn’t properly process the translated content at first. In other words, the previous step can only be started either after the reactor has been filled, or once the Alkylation Reactor System is already in operation with ethylene feed bypassing the treater. The purpose of doing this is to avoid completing the ethylene filling step only to be unable to switch to an ethylene feed flow for the Alkylation Reactor System. In other words, if this is not done, once the ethylene has been filled there is no place for it to go, so it can only be sent to the flare for burning, resulting in waste. (Predicted based on the process)

Put more of it to help with understanding. It’s just some procedure for carrying out an operation; this operation manual isn’t anything confidential.

Either upon completion of reactor filling or when the Alkylation Reactor System is already running with ethylene feed bypassing the treater (i.e., when the treater media is being replaced). The aim is to avoid completing the ethylene filling step only to find that it is no longer possible to switch to ethylene feed for the Alkylation Reactor System. Without the first sentence, revised version: When reactor charging is complete or the alkylation reactor is already in operation with ethylene feed bypassing the treater (for example, during the replacement of the treater media)； This purpose is to avoid the situation where, after the ethylene feed is exhausted, it is not possible to switch the ethylene feed to the alkylation reaction system.

The sequence is treatment unit first and then reactor; the treatment medium refers to the substance used for treatment (such as dehydration molecular sieves?), so it indeed isn’t \"replacement\". The operation mentioned in the previous sentence can only be carried out when the back route is unobstructed (when it is possible to use the main route after the reactor is filled, or when the material in the reactor is routed through a bypass). The purpose is to prevent the (processor) from being unable to switch to normal ethylene feeding, otherwise the flow will be blocked.

Yes, the reactor is bypassed when the processor replaces the catalyst. The untreated ethylene feed may poison the reactor catalyst.

Switch to ethylene feed flow to the Alkylation Reactor System – how should the ‘to’ after Switch be understood?

When “switch” and “to” are used together, it means “switch to”

This purpose is to avoid the situation where, after the ethylene feed is exhausted, it is not possible to switch the ethylene feed to the alkylation reaction system. After reviewing the previous discussions, to avoid ambiguity, it is better to change “cut the ethylene feed to the alkylation reaction system” to “the ethylene feed that is switched to the alkylation reaction system”. This post was last edited by niuky on 2009-2-12 at 11:34.]

My understanding is: either after the reactor has been filled, or when the alkylation reactor has already started operating with ethylene coming from the processor bypass (that is, when the processor medium is being displaced). The purpose is to avoid a situation where, after completing the ethylene charging step, it is not possible to switch the ethylene feed to the alkylation reactor. The ethylene feed bypassing the treater is different from what people generally think. Please give some advice.

The goal is to avoid completing the ethylene fill step only to find that it’s not possible to switch to ethylene feed flow (to the Alkylation Reactor System). The adjective in parentheses modifies ethylene feed flow, indicating its destination; as for whether the ethylene fill goes into the treater or the reactor, the reader should determine this based on the context.

The filling of the Ethylene Treater should take place only after the Alkylation Reactor System is ready to receive ethylene feed; either upon completion of reactor filling or when the Alkylation Reactor System is already running with ethylene feed bypassing the treater (i.e., when the treater media is being replaced). The objective is to avoid completing the ethylene fill step and then not being able to switch to ethylene feed flow to the Alkylation Reactor System. In my understanding, the ethylene filling process must be carried out after the Alkylation Reactor System is in operation, so as to prevent a situation where, once the filling step is completed, ethylene cannot be supplied to the Alkylation Reactor System ； From a process perspective, the feed flow can be understood as the ethylene feed line of the Alkylation Reactor System, or it can also be considered as the ethylene after passing through the treater ； Anyway, the outlet of the treater leads to the Alkylation Reactor System.

The ethylene feed flow is the main line that leads to the Reactor System; a branch line leads to the treater. Once the treater is full, it automatically switches to the main line (via bypass). If the Reactor System is not running at that time, a problem arises

I’m completely confused. May I ask what kind of device this is, original poster? An ethylbenzene/styrene plant? Upon completion of reactor filling or when the Alkylation Reactor System is already running..... What is the relationship between \"reactor\" and \"Alkylation Reactor\" in this sentence? What is the path of the ethylene feed between the treater and the reactor? .....

Bypassing is another scenario: it occurs when the catalyst in the treater needs to be regenerated or replaced during normal system operation, and bypassing is used to avoid disrupting production. Of course, after bypassing, a series of operations must be carried out on the treater, followed by an ethylene filling process, just as in the initial startup phase ； The key point of this passage is that the ethylene filling should be carried out only after the Reactor System is in operation, or while waiting for the Reactor System to finish filling before proceeding with the ethylene addition.