The impact of column temperature adjustment on the column
Thread Content
We are using a general-purpose FFAP capillary column; previously the column temperature was 110°C, with a programmed temperature increase of 4°C/min； Recently, due to the large number of high-boiling compounds being developed, the column temperature sometimes reaches 130°C, and in some cases even 160°C. What’s most incomprehensible is that some engineers directly suggested raising the temperature increase rate to 6°C/min! Working at such a column temperature, what level of column efficiency can the column ensure?
The FFAP capillary column can withstand temperatures up to 210 degrees; we maintain a temperature of around 205 degrees. It operates continuously for 24 hours without any problems, and occasionally programmed temperature ramping is used at a rate of 5 degrees per minute. (Imported columns; I’m not sure how they perform in domestic use.) Personally, I think that at your temperature level, it should have little impact on the column efficiency. Last edited by flks224086 on 2009-4-16 21:02.]
5 degrees per minute, 10 degrees, or 15 degrees is also fine. These all involve a constant heating rate; there is also a non-constant platform heating method, in which the heating rate is higher. No matter how much the temperature is increased, it is important to maintain relative stability in pressure and flow rate. A sudden increase in temperature can affect the efficiency of the column, leading to issues such as high column pressure and column clogging; if not managed properly, it can also impact the separation of components. These are all factors that need to be taken into account. If you understand these aspects, you will be able to make adjustments flexibly without compromising the separation process.
1. Pay attention to the upper temperature limit for use. 2. Do not set the flow rate of the carrier gas too high. 3. For FFAP columns, the factors that cause the most damage are the oxygen content and moisture content in the gas. Never do this
I forgot to mention the most important point: the set temperature for our column is 250°C! The upper limit for FFAP seems to be 220°C, right? Isn’t column loss really severe like this?~~~
I’ve never tried such high temperatures; the loss should be rapid
As long as you use it at the lower limit of the highest allowable operating temperature for the chromatography column, there should be no problem